House
extensions
in Golders Green, NW11
Architects, Engineers, Surveyors & Builders Under One Roof.
One Studio. One Contract. One Team.
RICS surveying support for party walls, licence to alter, conservation-area works & neighbour mattersWe design and build Golders Green house extensions across Hoop Lane, Wentworth Road, Golders Green Road - side-return, rear, wraparound and double-storey additions for Edwardian villas, 1920s Semis and Arts & Crafts terraces where planning strategy, conservation detailing, Party Wall sequencing and structural engineering need handling properly.
House Extensions in Golders Green: What You Need to Know
Every house extension project in Golders Green is designed to respect the Golders Green Conservation Area and the character of Edwardian villas, 1920s semis, Arts & Crafts terraces. Our in-house RIBA Chartered Architects handle Barnet planning applications, our chartered structural engineers specify any load-bearing work, and our directly-employed trades deliver the build under one fixed-price contract. We coordinate Building Control, Party Wall awards where needed, and all certifications through to handover.
Golders Green properties generally benefit from more relaxed planning controls, with many extensions achievable under permitted development rights. We assess the planning route at your free site visit.
Diverse suburban neighbourhood in Barnet with a vibrant high street, excellent transport links and proximity to Hampstead Heath extension. Family-oriented with spacious properties. Side-return extensions are particularly popular in Golders Green's terraced streets, transforming narrow kitchen spaces into full-width open-plan living areas connected to the garden.
Local character & heritage: extending in Golders Green
Golders Green grew rapidly as an Edwardian garden suburb after the Northern line arrived in 1907, which is why so much of NW11 is generous Edwardian family housing — bay-fronted terraces and semis with front gardens — alongside later mansion flats. It sits in the London Borough of Barnet, with conservation areas protecting the best Edwardian streets.
That Edwardian stock shapes the work: the family houses suit rear and side-return extensions and loft conversions to add space for growing families, while the mansion flats are about internal reconfiguration under the lease. Barnet expects extensions to respect the Edwardian facades, bay windows and roof lines that give the suburb its character.
With deep rear gardens on many plots, rear and garden-room extensions are popular, though the conservation streets and the closeness of Hampstead Garden Suburb mean designs have to stay sympathetic to the area's planned, low-density feel.
Golders Green heritage & architecture: From rural lands to NW11 suburbia · Edwardian facades in NW11 · Conservation areas explained · Renovating an NW11 terrace · Mansion flats · Listed buildings in NW11 · Best family-home streets · Golders Green Road
Extending a house in Golders Green is shaped by its position on the western edge of Hampstead Garden Suburb. Barnet's planning controls apply across the conservation areas, and homes towards the Suburb edge sit close to some of the tightest townscape rules in London — so the first task is establishing which regime governs your street.
The stock is confidently inter-war. Much of Golders Green grew quickly after the Underground arrived in 1907, which is why it is largely Edwardian villas, 1920s and 1930s semis and Arts & Crafts terraces, with conservation areas protecting the best streets and the green setting around Hoop Lane and Golders Hill Park. Highfield Avenue and Wentworth Road hold family houses well suited to rear additions.
On budget, Barnet's single-storey rear-extension figure is £71,250–£112,500 excluding VAT and a side return £90,000–£120,000 excluding VAT; a survey and the consent route then narrow those bands to your house.
What a House Extension Involves
An extension reshapes how the whole ground floor works, not just how big it is — the new structure, the opening into the existing house, the kitchen and the garden connection all have to be designed as one move. We take each project from feasibility drawings through consents, structure and fit-out under a single fixed-price contract. Most extensions we build include the scope below.
- Rear extensions — single-storey additions that open the back of the house to the garden
- Side-return & wraparound — infilling the side alley of a terrace, alone or combined with a rear addition
- Double-storey — new bedrooms or bathrooms above the ground-floor addition, designed to sit comfortably with the original roofline
- Foundations & steel — groundworks, beams and the opening into the existing house, engineered by our own structural team
- Glazing — rooflights, glazed roofs and slim-framed sliding or bi-fold doors specified for light and thermal performance
- Kitchen integration — the kitchen layout planned with the architecture from the first drawing, not squeezed in afterwards
- Services & heating — electrics, plumbing, drainage and underfloor heating built into the new floor
- External works — patio, drainage connections and garden reinstatement completed within the contract
How We Run Your Project
Six stages, with the consents and engineering settled before the first spade goes in.
- Feasibility visit — we assess the site, the boundaries and your brief, and identify the right consent route for your property.
- Design & approvals — our architects draw the scheme while planning or permitted development paperwork, structural calculations and party wall notices progress together.
- Fixed-price contract — every element specified and priced before construction, from foundations to door hardware.
- Groundworks & shell — excavation, foundations, walls, steel and roof, taken to weathertight while you carry on living in the house.
- Fit-out — insulation, services, glazing, kitchen, flooring and decoration, with the opening into the existing house formed once the shell is sealed.
- Completion — building control inspection, snagging, external works and handover with the full certification pack.
Read the full house extension guide for extension types, permitted development limits and the build programme stage by stage.
Many rear extensions can proceed under permitted development — broadly up to 3m deep on attached houses and 4m on detached, extendable to 6m and 8m through the prior approval scheme — but conservation areas, Article 4 directions and listed status change the picture, and every extension needs Building Regulations approval regardless of the planning route. Where foundations come within 3m of a neighbouring building, the Party Wall etc. Act 1996 obliges you to give adjoining owners a minimum of two months’ written notice before construction can begin. Our planning guide library sets out the rules for each borough.
Why Hampstead Renovations
We hold £10 million public liability insurance with Aviva; the certificate is available on request.
House Extensions in Golders Green: Questions
Does Golders Green's position next to Hampstead Garden Suburb affect an extension?
It does. Golders Green sits on the western edge of the Suburb, and homes towards that edge are close to some of the tightest townscape rules in London, so the Suburb regime just over the boundary can matter as much as Barnet's own conservation controls.
What sort of houses in Golders Green suit extensions?
Largely Edwardian villas, 1920s and 1930s semis and Arts & Crafts terraces — much of it built quickly after the Underground reached Golders Green in 1907 — which is why the area is so confidently Edwardian and inter-war in character.
What does a house extension cost in Golders Green?
The Barnet headline for a single-storey rear extension is £71,250–£112,500 excluding VAT; a side return is £90,000–£120,000 excluding VAT; and where a wraparound is on the table, the indicative London market band is £100,000–£200,000.
How is a kitchen extension in Golders Green priced?
Roughly £2,200–£3,500 per square metre of new floor area, plus a £5,000–£30,000 kitchen supply allowance. The build rate is excluding VAT; we turn that into a scheme figure once the size and specification are set.
Which Golders Green streets do you work on?
Highfield Avenue and Wentworth Road for the Edwardian villas and 1920s semis, and the Arts & Crafts terraces near Hoop Lane at the Suburb edge, among the characteristic addresses for extension work here.
How much does a house extension cost in Golders Green, NW11?
House extensions in Golders Green typically cost £2,400–£3,800/sqm. A single-storey rear extension runs approximately £45,000–£85,000, while a double-storey extension costs £80,000–£160,000. Our fixed-price contracts include foundations, structural steelwork, full build and interior fit-out.
House Extensions in Golders Green: Planning & Local Context
London Borough of Barnet · NW11
Planning for house extensions in Golders Green
Rear and side-return extensions are popular in Golders Green, but permitted-development rights are frequently restricted within parts of the Golders Green and Hampstead Garden Suburb conservation areas, so most extensions need a full planning application to London Borough of Barnet with design that respects the prevailing building line and materials.
London Borough of Barnet & conservation context
Golders Green NW11 sits within parts of the Golders Green and Hampstead Garden Suburb conservation areas, and Barnet's Local Plan applies, and in the Suburb the Hampstead Garden Suburb Trust adds a second, stricter layer of design control on top of council consent. Our in-house RIBA Chartered Architects prepare and submit every application to London Borough of Barnet and handle pre-application discussions where early planning advice is useful.
Building Regulations
House Extensions in Golders Green must satisfy Building Regulations — covering structural design to Part A, thermal performance to Part L, and drainage and foundations agreed with Building Control. Our in-house engineers manage Building Control from initial notice through to the completion certificate.
Recent work & local links
Explore our other Golders Green services — Kitchen Renovation Loft Conversions — or the Golders Green renovation hub for the full picture of how we work locally.
Our in-house planning team prepares and submits every London Borough of Barnet application and manages building control end to end. View our planning track record →
More Services in Golders Green
Book a Free Consultation
Visit our studio or invite us to survey your home. We’ll assess scope, discuss design possibilities and provide an honest budget framework — completely free.
Free Consultation
We survey your property, discuss your vision and provide a clear budget framework.