What is a ground floor extension Hampstead?
A ground floor extension in Hampstead is one of the most effective ways to unlock extra living space, improve the flow of a period home, and add long-term value in one of London’s most desirable postcodes. Whether you own a Victorian terrace near South End Green, a Georgian townhouse close to Hampstead High Street, an Edwardian family house on a leafy residential road, or a garden maisonette with underused rear space, a well-designed extension can transform how your home works day to day. In Hampstead, clients typically want brighter kitchens, larger dining areas, family rooms that connect to the garden, utility and boot rooms, or flexible open-plan spaces that still retain the character of the original property. The challenge is that Hampstead is not a standard extension location. Conservation area controls, heritage sensitivity, mature trees, basement conditions, neighbour proximity, and high expectations for design quality all mean that the right architectural approach matters from the very beginning.
Unlike more straightforward suburban projects, a ground floor extension in Hampstead often needs to balance planning strategy, contextual design, structural complexity, and refined interior detailing. Many local homes sit within conservation areas where the scale, massing, materials, glazing proportions, and visibility of new work are carefully assessed. Even where a proposal appears modest, planning officers may expect a scheme that preserves the host building’s character and respects neighbouring amenity. This is especially relevant for side returns, rear infills, and larger wraparound extensions where roof form, parapet heights, brick matching, and the relationship to the garden all affect the outcome. A successful project therefore starts with a measured survey, an understanding of local planning constraints, and a design concept that is both practical and sensitive to Hampstead’s architectural language.
From a lifestyle perspective, ground floor extensions are particularly popular because they improve the busiest part of the house. Many older Hampstead homes have compartmentalised layouts with narrow kitchens, dark rear rooms, awkward level changes, and limited visual connection to the garden. By extending at ground level, it becomes possible to create generous kitchen-dining spaces, family zones with rooflights and sliding doors, and layouts that support entertaining, home working, and everyday family life. Some homeowners want a calm contemporary intervention behind a traditional frontage, while others prefer a more classic extension with detailed brickwork, timber windows, and a composition that feels as though it has always been there. Both can work well, provided the design is tailored to the building, the street context, and the planning environment.
Budgeting is another crucial part of the process. Construction costs in Hampstead are generally above London averages due to access constraints, premium finishes, structural complexity, and the level of craftsmanship expected. Ground conditions can also affect cost, especially where mature trees are nearby or where drainage diversions, party wall matters, or underpinning are required. Beyond pure build cost, homeowners should allow for professional fees, planning fees, structural engineering, building control, party wall surveyors, kitchen and glazing packages, and a contingency for unforeseen conditions. The advantage of careful early-stage design is that it helps align ambition with budget before tender, reducing expensive changes later.
This guide explains everything you need to know about planning and delivering a ground floor extension in Hampstead. It covers the main extension types, planning permission considerations, building regulations, realistic cost ranges, likely timelines, common mistakes, and frequently asked questions. If you are considering extending your home, the most successful projects are those that combine strong architectural thinking with a clear understanding of local policy, buildability, and value. In a place like Hampstead, quality is not optional; it is the foundation of a project that looks right, performs well, and enhances the way you live for years to come.
Types of ground floor extension Hampstead
Understanding the different types of ground floor extension hampstead available is essential for making the right choice for your property, budget, and requirements. Each type has distinct advantages, cost implications, and suitability for different property types.
Rear Ground Floor Extension
A rear ground floor extension is the most common solution for Hampstead homes because it enlarges the living area without altering the principal street elevation. It works particularly well for Victorian, Georgian and Edwardian properties where the back of the house can be opened up to create a larger kitchen, dining room, or family space with direct access to the garden. This type of extension can introduce rooflights, large-format glazing, improved garden views, and better daylight into the centre of the house. It is often easier to integrate with the existing plan than more complex extension forms, and when designed carefully it can feel generous without overwhelming the original building. In many Hampstead properties, a rear extension also offers the best opportunity to create a calm contemporary interior behind a traditional exterior.
The main drawback is that rear extensions are heavily scrutinised in conservation-sensitive areas, particularly where depth, height, materials, or glazing could appear visually intrusive. If the garden is modest, extending too far can compromise outdoor amenity and reduce natural light to the existing rear rooms and neighbouring homes. Structural alterations are often significant because the rear wall may need to be largely removed, requiring steelwork, temporary support, and careful sequencing. Drainage runs, inspection chambers, and changes in external levels can also complicate the build. In some Hampstead properties, access through the house only can increase labour time and disruption.
Side Return Extension
A side return extension is ideal for terraced and semi-detached Hampstead houses with an underused alleyway or narrow strip of land alongside the rear room. Although the additional footprint may seem modest, enclosing the side return can dramatically improve the width, brightness, and usability of the kitchen and dining area. This approach often delivers excellent value because it transforms awkward layouts into practical everyday family spaces without consuming too much garden. Rooflights along the side return roof can bring daylight deep into the plan, and the extension can be detailed in brick, zinc, aluminium, or timber depending on the desired character. For period homes, side returns are often one of the least visually disruptive ways to extend.
The challenge with a side return extension is that the gain in floor area may be relatively small compared with the level of structural and design input required. Party wall matters are common because the work is close to neighbouring boundaries. Care is needed to avoid creating a long deep room with poor ventilation or a dark central zone if the rooflight strategy is weak. Planning officers may also object if the extension appears bulky, if parapet heights are excessive, or if detailing is unsympathetic to the host building. Because the work often involves removing internal walls and reconfiguring services, the project can be more disruptive than homeowners initially expect.
Wraparound Extension
A wraparound extension combines a rear extension with a side return, creating a much larger and more flexible ground floor footprint. In Hampstead, this is a popular option for families who want a substantial open-plan kitchen-living-dining space, possibly with a separate utility room, pantry, study nook, or snug. It can completely reorient the house around the garden and allow for a highly functional layout with strong circulation and generous natural light. If designed well, a wraparound extension can solve multiple issues at once: poor room proportions, lack of storage, disconnected spaces, and limited family seating. It also offers more freedom for zoning, bespoke joinery, and premium kitchen layouts.
Wraparound extensions are usually the most expensive and planning-sensitive of the common ground floor options. Their larger footprint can reduce garden depth and increase concerns about overshadowing, enclosure, and visual bulk. They often require more extensive structural intervention, more steelwork, and a more complex roof design to ensure good daylight reaches the centre of the plan. In conservation areas, a wraparound extension must be handled with great care so that it does not appear overdominant or out of keeping with the original house. Build time is longer, site logistics are more demanding, and the risk of budget drift is greater if the design is not fully resolved before tender.
Infill or Garden Room Style Extension
An infill or garden room style extension can be an excellent choice for Hampstead properties where the goal is to create a refined, light-filled room without a large increase in footprint. This may involve filling a recessed rear corner, adding a compact dining bay, or creating a pavilion-like extension that opens to the garden. The benefits include strong visual connection to landscaping, potential for elegant contemporary detailing, and a lower planning impact than a deeper full-width extension. These projects can be particularly successful in architecturally sensitive settings where restraint is valued and the emphasis is on quality rather than size. For clients who want a beautifully crafted room rather than a major reconfiguration, this can be an ideal route.
The limitation is that compact extensions demand very efficient planning to justify the investment. If the existing internal layout remains poor, a small infill alone may not deliver the transformation the homeowner expects. Bespoke glazing, slim roof profiles, and high-end finishes can make even a small project relatively expensive per square metre. There is also a risk that a highly glazed room may overheat in summer or feel exposed if solar control, ventilation, and privacy are not carefully considered. In conservation contexts, even a modest contemporary intervention must demonstrate excellent design quality to secure approval.
Planning Permission in London
Planning permission for a ground floor extension in Hampstead requires careful analysis from the outset because many properties are affected by conservation area policies, heritage considerations, and site-specific constraints. While some minor extensions elsewhere in London may fall under permitted development rights, homeowners in Hampstead should never assume this will apply. Flats and maisonettes do not benefit from permitted development in the same way as single houses, many properties have had rights removed, and conservation area sensitivities can make even lawful proposals more complex in practice. The first step is to establish the planning status of the property, identify whether it is listed, confirm whether Article 4 directions or previous planning conditions apply, and review the relevant Camden planning policies and supplementary guidance.
For most Hampstead extension projects, the key planning questions are scale, design quality, relationship to the host building, impact on neighbours, and effect on the character of the conservation area. Officers will typically examine the depth and height of the extension, the roof form, the amount of glazing, the treatment of parapets and boundary walls, and whether the proposal appears subordinate to the original house. A successful scheme usually demonstrates restraint. That does not mean the design must be bland; rather, it should be proportionate, well-detailed, and clearly informed by the architecture of the building and the wider streetscape. In some cases a contemporary extension is entirely appropriate, but it must still be elegant, high quality, and carefully composed.
Neighbour impact is another major planning consideration. Rear extensions can affect outlook, daylight, and privacy, especially in terraces where gardens are closely aligned. Policies generally seek to protect neighbouring amenity, so overshadowing studies, section drawings, and contextual elevations can be important supporting material. If your proposal sits close to a boundary, has a high wall, or projects significantly beyond the rear building line of adjacent properties, it may attract objections. Good architectural design can often mitigate this by stepping the massing, lowering eaves, refining roof geometry, or reducing the perceived bulk through material changes and glazing placement.
Trees are especially relevant in Hampstead, where mature landscaping contributes strongly to local character. If there are trees on or near the site, root protection zones may influence foundation design, extension position, and construction methodology. Planning applications may need arboricultural input, and officers will be cautious about any proposal that threatens important trees. This can affect not only whether permission is granted, but also how the extension is ultimately built. Likewise, if your home is listed, any extension and many internal alterations will require listed building consent in addition to planning permission, with a much higher level of scrutiny regarding fabric, reversibility, and heritage significance.
In practical terms, the best route is usually to commission an architect to prepare a feasibility study before committing to a final design. This early stage should test planning risk, budget fit, and spatial options. For more sensitive sites, pre-application advice can be useful, though the value depends on the complexity of the proposal and the quality of the submission. Once the preferred option is chosen, a full planning package generally includes existing and proposed drawings, a design and access statement where required, site photos, heritage information if relevant, and any technical reports needed to support the application. A thoughtful planning strategy does more than secure consent; it lays the groundwork for a smoother build and a better final result.
Building Regulations
Building regulations approval is required for virtually every ground floor extension in Hampstead, regardless of whether planning permission is needed. While planning focuses on external appearance, policy, and neighbour impact, building regulations deal with safety, structural integrity, thermal performance, drainage, ventilation, fire protection, and accessibility. In high-value period homes, compliance is particularly important because the extension often interfaces with older fabric that may have uneven walls, shallow foundations, suspended timber floors, or outdated services. A well-developed technical design package is essential to avoid delays, cost overruns, and improvised decisions on site.
Structure is one of the most significant building control issues. Most ground floor extensions involve excavation for new foundations and the removal of part or all of an existing rear wall. The structural engineer will specify foundation type, steel beams, padstones, lintels, and any local strengthening needed to support the retained building. In Hampstead, foundation design can be influenced by clay soil, nearby trees, drainage routes, and party wall conditions. If the property has a basement or sits on sloping ground, structural coordination becomes even more important. Temporary works may also be required during construction to keep the house stable while openings are formed.
Thermal performance and energy efficiency are another major area of compliance. New walls, floors, roofs, doors, and windows must meet current standards for insulation and heat loss. This affects cavity build-up, roof depth, floor construction, and glazing specification. Many homeowners want large sliding or pivot doors opening onto the garden, but these must be balanced with energy performance, solar gain control, and ventilation. In a high-end Hampstead extension, it is common to integrate underfloor heating, high-performance glazing, mechanical extract, and carefully detailed insulation to create a comfortable year-round environment. If the extension is highly glazed, overheating analysis may also be sensible even where not formally required.
Drainage frequently catches homeowners by surprise. Existing manholes, foul drains, and rainwater routes often run through the rear garden exactly where the extension is proposed. Building regulations require suitable drainage design, access for maintenance, and proper falls. This can mean relocating inspection chambers, installing new gullies, separating rainwater and foul water where appropriate, or obtaining agreements if a public sewer is affected. Internal plumbing layouts for kitchens, utility rooms, and cloakrooms should be coordinated early so that floor build-ups and service runs work efficiently without compromising structure or ceiling heights.
Fire safety, ventilation, and means of escape must also be addressed. Even a single-storey extension can affect escape routes from upper floors if the internal layout changes significantly. Ventilation requirements apply to kitchens, utility rooms, and bathrooms, while habitable rooms need adequate background ventilation and purge ventilation. If the new space is open plan, the fire strategy may need to consider alarms, escape windows, and separation. Building control will also assess electrical safety, glazing safety in critical locations, and accessibility issues such as threshold levels and door widths. The most reliable way to manage all of this is to move from planning drawings into a detailed building regulations package before tender, ensuring contractors price the real scope of work rather than making assumptions that lead to variations later.
ground floor extension Hampstead Costs in London 2025
The cost of a ground floor extension in Hampstead depends on far more than the number of square metres added. While broad ranges are useful, the final budget is shaped by planning constraints, structural complexity, site access, specification level, and how much of the existing house is being remodelled alongside the extension. As a realistic starting point, a small and relatively straightforward extension might begin around £50,000 to £75,000, a medium project often falls between £75,000 and £110,000, and a larger or more design-led scheme can exceed £150,000 once kitchens, glazing, landscaping, and professional fees are included. In premium Hampstead locations, costs can rise further where workmanship expectations are very high or where difficult logistics increase labour and programme demands.
One of the biggest cost drivers is structure. If the project requires large steel beams to create an open-plan room, extensive temporary works, reinforced foundations near trees, or drainage diversions beneath the footprint, the budget can move quickly. Period properties often conceal surprises such as shallow foundations, irregular brickwork, or historic alterations that need correction. Access is another major factor. Many Hampstead houses have limited side access, controlled parking, narrow roads, or restrictions on deliveries, all of which increase labour and waste removal costs. If materials must be carried through the house, the build becomes slower and more protective measures are needed.
Specification has a huge impact on total spend. A simple extension with standard rooflights, good but conventional aluminium doors, and a modest kitchen will cost far less than one with bespoke joinery, slim-frame glazing, specialist stone, polished plaster, engineered ventilation, and integrated lighting control. Homeowners often focus on the shell cost but underestimate the price of the fitted elements that make the space feel complete. Kitchens, utility rooms, flooring, decoration, external paving, and garden steps can together represent a substantial portion of the budget. If the extension floor level changes or you want flush thresholds to the garden, additional structural and drainage coordination may be required.
Professional fees should also be included in the financial plan from day one. These may cover architectural design, measured survey, structural engineering, planning consultant input if needed, party wall surveyors, building control fees, and interior design support. Depending on the project, you may also need arboricultural advice, heritage consultancy, or a Thames Water build-over agreement. A sensible contingency is essential, particularly in older Hampstead homes where hidden conditions are common once demolition begins. Many clients allow 10 to 15 percent depending on how much uncertainty exists at the outset.
The best way to control cost is not to reduce ambition blindly but to make informed design decisions early. A carefully resolved scheme can often save money by simplifying structure, rationalising glazing sizes, coordinating services, and avoiding expensive late-stage changes. Tendering to suitable contractors with relevant Hampstead and North London experience is equally important. The cheapest price is rarely the best value if it excludes key items or lacks understanding of conservation-sensitive work. A realistic budget, thorough technical information, and a contractor who appreciates quality are the foundations of a successful extension that performs as well financially as it does architecturally.
Quick Cost Summary
Timeline: How Long Does It Take?
The timeline for a ground floor extension in Hampstead typically ranges from six to ten months from initial design to final completion, though more complex projects can take longer. The first stage is concept and design development, which often takes four to eight weeks depending on how quickly decisions are made and how many options are explored. During this period, the architect will survey the property, assess planning constraints, test layouts, and refine the preferred scheme. In Hampstead, this stage is especially important because design quality and planning strategy are closely linked. Rushing this phase can lead to weak applications, avoidable objections, and costly redesign later.
If planning permission is required, the formal application process usually takes around eight to twelve weeks, though this can extend if the proposal is sensitive, if revisions are requested, or if committee review becomes necessary. Listed building consent or more complex heritage cases may take longer. Once planning is secured, the project moves into technical design and building regulations information. Some homeowners overlap this work with the planning stage to save time, but doing so carries a degree of risk if the design changes after approval. A thorough technical package is vital for accurate pricing and smoother construction, so this stage should not be treated as an afterthought.
Construction time varies according to size, complexity, weather, access, and whether the clients remain in occupation. A compact side return extension may be completed in around twelve to sixteen weeks, while a larger rear or wraparound extension with substantial internal remodelling can take sixteen to twenty-four weeks or more. Early works generally include site setup, demolition, excavation, foundations, drainage, and structural steel installation. The shell then progresses through walls, roof construction, windows and doors, first fix services, plastering, second fix joinery, kitchen installation, decoration, and flooring. If bespoke glazing or specialist finishes are involved, lead times must be factored into the programme well in advance.
The final finishing stage usually takes two to four weeks and includes snagging, commissioning of heating and ventilation systems, final electrical works, decorating touch-ups, and completion of external elements such as paving, drainage channels, steps, and making good to the garden. This phase is often underestimated, yet it has a major impact on the quality of the handover. In Hampstead, where expectations for detailing are high, careful finishing is essential to achieve a polished result that feels fully integrated with the original house.
Homeowners can help keep the programme on track by making key design and specification decisions early, approving drawings promptly, and ensuring funding is in place before work begins. Delays commonly arise from slow decisions on kitchens, tiles, glazing, and joinery, as these items often have long lead times. Party wall matters should also be started early if neighbours are affected. With realistic planning, a good consultant team, and an experienced contractor, a ground floor extension in Hampstead can progress smoothly and deliver a transformative improvement to the home within a clear and manageable timeframe.
Timeline Summary
- Design4-8 weeks
- Planning8-12 weeks
- Construction12-24 weeks
- Finishing2-4 weeks
- Total6-10 months
The Design Process
At Hampstead Renovations, we follow a structured design process for every ground floor extension hampstead project. This process has been refined over hundreds of projects across North London and ensures that nothing is overlooked, budgets are managed, and the final result exceeds expectations.
1. Initial Brief & Site Visit
Every project begins with a conversation. We visit your property, listen to your requirements, understand your budget, and assess the feasibility of your ideas. For ground floor extension hampstead, this initial visit is crucial — we need to understand the existing structure, identify constraints, and discuss the range of options available to you. This meeting is free and without obligation.
2. Concept Design
Based on the brief, we develop two or three concept design options. These are presented as floor plans, sections, and 3D visualisations so you can understand how the space will look and feel. We discuss the pros and cons of each option, the cost implications, and any planning considerations. This phase typically takes 2–3 weeks.
3. Developed Design
Once you have chosen a preferred concept, we develop it in detail. This includes finalising the layout, specifying materials and finishes, developing the structural strategy with our engineer, and resolving all the technical details that affect how the space works. We provide a detailed cost estimate at this stage so you can make informed decisions about specification.
4. Planning Application (if required)
If planning permission is needed, we prepare and submit the application, including all supporting documents (design and access statement, heritage impact assessment for listed buildings, structural methodology for basements). We manage the application process, respond to any council queries, and negotiate with planning officers where necessary.
5. Technical Design & Building Regulations
We produce detailed construction drawings and specifications — the documents your contractor will build from. These include architectural plans, sections and elevations, structural engineering drawings, services layouts, and a comprehensive specification of materials and workmanship. We submit for Building Regulations approval and manage the approval process.
6. Tender & Contractor Appointment
We invite three to four vetted contractors to price the project from our detailed drawings and specification. We analyse the tenders, interview the contractors, and recommend the best appointment based on price, programme, experience, and references. We help you negotiate the contract terms and agree a realistic programme.
7. Construction & Contract Administration
During construction, we carry out regular site inspections to ensure the work complies with the design, specification, and Building Regulations. We chair progress meetings, manage variations, certify interim payments, and resolve any issues that arise. Our role is to protect your interests and ensure the project is delivered to the agreed quality, programme, and budget.
8. Completion & Handover
At practical completion, we carry out a thorough snagging inspection and produce a defects list for the contractor to address. We manage the Building Control final inspection, obtain the completion certificate, and compile a comprehensive handover pack including all warranties, certificates, maintenance guides, and as-built drawings.
Common Mistakes to Avoid
Over hundreds of ground floor extension hampstead projects across London, we have seen the same mistakes repeated. Learning from others' errors can save you thousands of pounds and months of frustration.
1. Assuming permitted development applies
Many Hampstead homeowners assume a rear extension can proceed without planning permission, only to discover that conservation area issues, property type, or removed rights make a full application necessary. Always verify the planning position before design work advances too far.
2. Underestimating heritage and conservation sensitivity
A design that might be accepted elsewhere in London can face resistance in Hampstead if it appears bulky, poorly proportioned, or unsympathetic to a period property. Contextual design and material choices matter enormously.
3. Prioritising size over layout quality
A bigger extension is not always a better one. Poor zoning, inadequate storage, weak daylight strategy, or awkward circulation can leave a large new room feeling underwhelming. Space planning should lead the design.
4. Ignoring drainage and foundation risks early
Rear gardens often contain drains, manholes, and tree-related foundation constraints. If these are not considered during feasibility, the project can face significant extra cost once construction begins.
5. Choosing glazing before resolving overheating and privacy
Large glass doors and rooflights are popular, but they need to be coordinated with orientation, shading, ventilation, and neighbouring views. Otherwise the room may overheat, glare, or feel exposed.
6. Going to tender with incomplete technical drawings
If contractors price from planning drawings only, quotations can vary wildly and important items may be omitted. Detailed building regulations information helps produce accurate pricing and reduces costly variations.
7. Underbudgeting for kitchens, joinery and finishes
The shell of the extension is only part of the total cost. Bespoke storage, kitchen appliances, flooring, lighting, and landscaping often make a major difference to the final budget.
8. Starting party wall matters too late
If the extension affects a boundary or requires excavation near neighbouring structures, party wall procedures may apply. Leaving this until the last minute can delay the construction start date.
How to Choose a Contractor
The choice of contractor is one of the most important decisions you will make in any renovation project. A good contractor delivers quality work on time and on budget; a poor one can cause delays, cost overruns, defective work, and enormous stress. Here is how to find and evaluate the right contractor for your project.
What to Look For
- Relevant experience: Ask to see completed projects similar to yours in type, scale, and specification. A contractor who specialises in basement conversions may not be the best choice for a period restoration, and vice versa. Request references from recent clients and, if possible, visit a completed project
- Insurance: Verify public liability insurance (minimum £5 million), employer's liability insurance (a legal requirement if they employ anyone), and professional indemnity insurance if they are providing any design input. Ask to see current certificates, not expired ones
- Trade body membership: Membership of the Federation of Master Builders (FMB), TrustMark, or the National Federation of Builders (NFB) provides some assurance of competence and financial stability. For specialist work, look for relevant accreditations (e.g., PCA for waterproofing, NICEIC for electrical)
- Financial stability: A contractor who goes bust mid-project is every homeowner's nightmare. Check Companies House for financial health, look for a stable trading history, and consider whether the company has sufficient resources to manage your project alongside their other commitments
- Communication style: During the quoting process, assess how responsive, clear, and professional the contractor is. This is a preview of how they will communicate during the project. If they are slow to return calls or vague in their quotes at this stage, it will not improve once they have your money
Red Flags to Avoid
- Quoting without visiting the site or seeing detailed drawings
- Requesting large upfront payments (more than 10–15% of the contract value)
- No written contract or a vague, one-page quotation
- Pressure to commit quickly or "special" discounts that expire
- Unable or unwilling to provide references from recent projects
- No insurance certificates available for inspection
- The quote is significantly lower than all others — this usually means something has been missed, not that they are offering better value
Questions to Ask
- How many similar projects have you completed in the last two years?
- Who will be the site manager/foreman for my project, and how many other projects will they be managing simultaneously?
- What is your proposed programme (start date, key milestones, completion date)?
- How do you handle variations and additional work — what is your day rate for unforeseen items?
- What warranty do you provide on your work?
- Can I speak to three recent clients whose projects are similar to mine?
Case Studies
Our portfolio includes hundreds of ground floor extension hampstead projects across London. Here are three examples that illustrate the range of work we undertake:
Victorian Terrace, Hampstead (NW3)
A comprehensive ground floor extension hampstead project on a four-bedroom Victorian terrace in a conservation area. The project required careful liaison with Camden planning officers to ensure the design respected the architectural character of the street while delivering modern living standards. Completed on time and within the agreed budget, the project added approximately 20% to the property value.
Edwardian Semi, Crouch End (N8)
A family of five commissioned this ground floor extension hampstead project to create additional space and modernise the property while retaining its Edwardian character. Original features including cornicing, ceiling roses, and timber panelling were carefully restored, while new elements were designed in a contemporary style that complements rather than imitates the original architecture.
Period Property, Highgate (N6)
This substantial ground floor extension hampstead project in Highgate Village required Listed Building Consent and close collaboration with the local conservation officer. The design balanced the need for modern comfort and energy efficiency with the preservation requirements of the listed building. Specialist heritage contractors were appointed for sensitive elements including lime plastering, timber window restoration, and stone repairs.