Hampstead Garden Suburb is London's most architecturally regulated neighbourhood — a planned utopia of Arts & Crafts homes designed by Edwin Lutyens and Raymond Unwin, where the Hampstead Garden Suburb Trust controls every external alteration through its Scheme of Management. From our Finchley Road studio, our architects specialise in the unique dual-consent process that makes renovating in NW11 unlike anywhere else in London.
Hampstead Garden Suburb was founded in 1907 by Dame Henrietta Barnett as a model community where all social classes would live together in beautifully designed homes surrounded by nature. She commissioned the greatest architects of the age — Edwin Lutyens designed the Central Square and its two churches, while Raymond Unwin and Barry Parker laid out the winding tree-lined streets, generous gardens, and hedged boundaries that define the Suburb to this day.
The architecture is remarkably cohesive and distinctive. Red-brick and roughcast-rendered facades, steeply pitched clay-tile roofs, tall decorative chimneys, leaded-light casement windows, and carefully proportioned doorways create a visual harmony unlike any other London neighbourhood. Hedges — not fences or walls — form the standard boundary treatment, maintaining the open, garden-city character that Unwin envisioned. The masterplan even specifies that no two adjacent houses should be designed in the same style.
For homeowners in NW11, renovating is uniquely complex. The Hampstead Garden Suburb Trust operates a Scheme of Management — a legally binding framework under the Leasehold Reform Act — that controls virtually every aspect of a property's external appearance. You cannot change a window, alter a roof, replace a front door, remove a chimney, or even repaint your facade without Trust consent. This is separate from and additional to Barnet Council planning permission. Our architects navigate both consent processes daily and understand exactly what the Trust will — and won't — approve.
That negotiation is what we do. Our design studio is on Finchley Road. Our architects have worked with Camden's planning team on hundreds of applications. We understand the constraints because we live within them.
From Arts & Crafts restoration to Trust-approved rear extensions, every service shaped by our deep knowledge of the Suburb's unique dual-consent process and Barnet's planning requirements.
Specialist restoration of Lutyens and Unwin properties. Original leaded-light windows, clay-tile roofs, decorative chimneys, roughcast render, and period-appropriate materials that satisfy the Trust's exacting standards.
Full management of the dual-consent process. We prepare and submit applications to the HGS Trust and Barnet Council simultaneously, attend Trust panel meetings, and manage all correspondence. Our approval rate exceeds 95%.
Complete transformation of Arts & Crafts properties from shell to finished home. Internal modernisation behind Trust-compliant facades — contemporary kitchens, luxury bathrooms, and smart home systems within period exteriors.
Rear extensions designed to Trust specifications. No front-facing alterations permitted — all extensions must be invisible from the street.
Like-for-like replacement of leaded-light casement windows and period front doors. Trust consent required for all window changes, even internal glazing upgrades.
Contemporary kitchens designed for Arts & Crafts proportions. Island layouts, integrated appliances, and finishes that complement period interiors.
Clay-tile roof repairs, decorative chimney restoration, and lead valley relining. Trust consent required — we manage the entire application process.
RIBA architects. Conservation area applications, 3D visualisation, construction drawings.
Chartered engineers. Internal wall removal, steel beam installation, and structural assessments for NW11's Arts & Crafts properties.
Period-appropriate schemes. Material selection, space planning, furniture specification.
Barnet planning and HGS Trust expertise. Dual-consent applications, Scheme of Management compliance, and conservation area guidance.
Grade I, II* and II listed property expertise. Listed Building Consent managed in-house.
Specialist renovation of Lutyens villas, Unwin cottages, and Parker-designed Arts & Crafts homes.
Full Party Wall Act management through our RICS chartered surveying practice.
RICS condition surveys via Hampstead Chartered Surveyors & Building Consultancy.
Hampstead Garden Suburb falls under the London Borough of Barnet & HGS Trust. The Hampstead Garden Suburb Conservation Area is one of the largest in London and covers virtually the entire village, The Trust's Scheme of Management adds a uniquely stringent layer of control above standard conservation rules.
The Trust's Scheme of Management controls virtually every external aspect of your property: windows, doors, roofs, chimneys, render, paint colours, boundary treatments (hedges only — no fences or walls), satellite dishes, solar panels, and even the colour of your front door. Internal works do not require Trust consent, but any structural changes still need Barnet planning permission. Our architects prepare applications for both bodies simultaneously to minimise delays.
View HGS Trust website →The entire Suburb is a conservation area. The HGS Trust Scheme of Management adds a uniquely stringent layer of design control above standard conservation rules.
The Trust must approve all external alterations: windows, doors, roofs, paint colours, boundary treatments, and extensions. Separate from and additional to Barnet planning permission.
The Trust requires hedges — not fences or walls — as boundary treatments. This is the defining visual characteristic of the Suburb and is strictly enforced.
The HGS Trust offers pre-application guidance. We strongly recommend engaging with the Trust before commencing design work on any external alteration.
Realistic cost ranges for the most common project types in Hampstead Garden Suburb. Heritage and conservation requirements typically add 10–20% to standard London pricing.
The utopian vision, Arts & Crafts architecture, and the Trust that has preserved Henrietta Barnett's garden suburb for over a century.
How a social reformer from Whitechapel created a utopian model community on the Hampstead Garden Suburb Heath Extension.
St Jude's Church, the Free Church, and the Institute — Lutyens' masterplan for the Suburb's civic and spiritual centre.
How the Scheme of Management has preserved the Suburb's character since 1968 — and what it means for homeowners today.
Selected projects from across London.

Five-storey house extension, full basement conversion, loft conversion and complete refurbishment within Belsize Park’s conservation area.
View Case Study →
Penthouse duplex refurbishment and roof reconstruction within a Grade II listed setting, unifying the top two levels into seamless luxury living.
View Case Study →
Office-to-retail and residential conversion delivering the Calzedonia store fit-out with three high-spec apartments above, preserving the original façade.
View Case Study →Use these area-specific guide pages to move from broad research into the main build routes people compare in Hampstead Garden Suburb NW11.
The Hampstead Garden Suburb Trust operates a legally binding Scheme of Management under the Leasehold Reform Act 1967. This gives the Trust control over all external alterations to properties in the Suburb — including windows, doors, roofs, chimneys, paint colours, boundary treatments, and extensions. Trust consent is separate from and additional to Barnet Council planning permission. View the HGS Trust website →
Only with Trust consent, and only on a like-for-like basis. The Trust requires replacement windows to match the original design, materials, and glazing pattern exactly. Leaded-light casement windows must be replaced with matching profiles. uPVC is not permitted. Our architects prepare detailed window schedules and elevations to support Trust applications.
Rear extensions only — no front or side extensions are permitted. The extension must be invisible from the street and must not project above the existing eaves line. The Trust and Barnet must both grant consent. Our architects have a strong track record of Trust-approved rear extensions that maximise space while complying with all restrictions. All projects are delivered on fixed-price contracts.
The Trust requires hedges as boundary treatments throughout the Suburb, maintaining the open, garden-city character that Raymond Unwin designed. Fences and walls are not permitted. The Trust specifies acceptable hedge species and minimum heights. Our team can advise on compliant boundary plantings and coordinate Trust applications for any boundary changes.
No — the Trust's Scheme of Management only controls external alterations. Internal works such as kitchen renovations, bathroom upgrades, and structural changes (wall removal, steel beams) do not require Trust consent. However, structural works still require Barnet Council approval, and any changes visible from outside (e.g., internal glazing that alters window appearance) may trigger Trust involvement.
Chimneys are a defining architectural feature of the Suburb and the Trust almost never permits their removal. Solar panels are subject to Trust consent and are generally only approved if invisible from the street (e.g., on rear roof slopes). Our architects can advise on what is achievable within Trust guidelines.
Our initial consultation is free and carries no obligation. Visit our design studio on Finchley Road to explore material selections, meet our team, and discuss your project in person.