Hampstead Architecture and Planning

Barnet

House Refurbishment Architects in Golders Green

We plan whole-house refurbishments and mansion-flat reconfigurations in Golders Green, from Edwardian bay-fronted houses bought after decades in one family to leasehold flats governed by a lease rather than by planning. The brief divides on tenure first and fabric second, so we settle the consent route — Barnet, freeholder, building regulations — before the layout is drawn.

Last updated

Practice leadership

Eyal Moran, Director and Lead Architect, is an ARB-registered architect, leading design judgement, planning strategy and technical coordination across client projects.

Verify on the Architects Register

The short answer

Can you refurbish a house or mansion flat in Golders Green?

Yes. Refurbishment here turns on tenure. A freehold Edwardian or interwar house answers to Barnet for external change, to building regulations for structure and life safety, and to the Party Wall Act at shared walls. A leasehold mansion flat answers to its lease: internal scope, freeholder consent, and fire, acoustic and ventilation compliance. We confirm which route applies before designing.

Planning at a glance

Golders Green

Planning at a glance in Golders Green
Local planning authorityLondon Borough of Barnet
Postcode districtNW11
Likely approval routeHouseholder planning application or permitted development, depending on conservation status, listing and property type — confirmed for the exact address before drawings begin
Statutory determination time8 weeks for most householder applications (13 weeks for major applications)
Typical drawing package£395–£4,950 inc. VAT, fixed fee. Find my package →

A refurbishment brief in Golders Green divides on tenure before it divides on design. A freehold Edwardian or interwar house answers to Barnet for anything that changes the exterior, to the building regulations for everything structural or life-safety related, and to the Party Wall etc. Act 1996 where the work touches a shared wall. A purpose-built mansion flat — and the stock around the crossroads and Finchley Road is substantial — answers first to its lease: the scope is usually internal reconfiguration and refurbishment, freeholder consent is required, external alteration is generally not the leaseholder's to make, and structural walls carrying the block above limit what can be removed. The same brief, written in the same words, therefore runs two entirely different consent routes. We establish which one you are on before a single layout is drawn, because the sequence of approvals — not the drawings — sets the programme.

Many Golders Green refurbishments follow a sale. A house that has been in one family for decades changes hands, and the new owner inherits a plan that has barely moved since it was built. The bones are usually good: these are generous, well-built homes with good ceiling heights and mature gardens, which is why refurbishment rather than replacement is the sensible instinct here. What is tired is mostly what you cannot see. The kitchen is stranded in a narrow rear back-addition or an old service room; wiring, heating and hot water are at the end of their lives; the bathroom count no longer matches the bedroom count; and the ground floor is cut into cellular rooms that turn their back on the garden. The gain is spatial and technical rather than square-footage, and the survey has to establish what the structure will actually permit before the layout starts promising it.

Opening up a house of this period is a load-path exercise. Edwardian and interwar plans carry weight down a spine wall, through chimney breasts and onto footings that were never sized for the point loads a modern steel introduces, so every wall you propose to remove has to be traced to a foundation capable of taking what replaces it. Beams bearing into a party wall, chimney-breast removal on a shared flank, and new pad foundations excavated close to a neighbour's structure all engage the Party Wall etc. Act 1996: building on the line of junction, or excavating within three or six metres of a neighbour's structure, triggers notices that run entirely separately from any planning decision. On a semi-detached or terraced house these are routine rather than exceptional, but they consume programme, so notifiable work is identified at design stage rather than discovered when the contractor arrives.

Fabric upgrades are where a refurbishment either works with the building or fights it. Solid and early-cavity walls, single-glazed timber windows and suspended timber floors reward a fabric-first, breathable approach — draught-proofing and airtightness first, then insulation detailed so that moisture is not trapped in construction designed to dry out. The external half of that ambition is the part to test earliest. Where the property sits within the Golders Green Town Centre Conservation Area, or close enough to Hampstead Garden Suburb for the Suburb's controls to reach it, permitted development is reduced and visible alterations are closely scrutinised, while other streets in the area retain their permitted-development rights. Because that varies block by block, the designation should be confirmed with Barnet for the exact address before any window, roof or render change is assumed to be available to the scheme.

A mansion-flat refurbishment is a different technical animal. The lease, not the planning system, is the main gate: freeholder consent — usually a Licence to Alter — is required, and party-wall agreement applies where the work touches structure shared with the flat next door, above or below. The design problems are ones a house never poses. Wet areas cannot travel far from the existing soil stack without a serious drainage strategy; a bathroom or utility placed in the middle of a plan has no external wall and therefore needs mechanical ventilation; hard floors replacing carpet change impact-sound transmission to the flat below, so the acoustic build-up has to be designed rather than assumed; and fire separation between dwellings — and between a residential upper part and a commercial ground floor on the town-centre frontages — governs compartment lines and the protected escape route. These are building-regulations and lease matters running together.

The last decision is the order of things. Our first question on a Golders Green refurbishment is which consent the project actually needs first: a householder planning application, a lawful development certificate to put a permitted-development claim beyond argument, a Licence to Alter from a freeholder, or simply a building-regulations submission for work that engages no planning at all. Getting that order wrong is what stalls projects that were otherwise ready to build. The statutory householder period runs to around eight weeks, and a freeholder's consent moves on its own timetable, so the two are programmed in parallel rather than end to end. We then advise on decant versus phasing, since full service renewal and structural opening-up are usually best done vacant, and we scope the drawings so a contractor can price the whole property at once. We do not promise approval — from Barnet or from a freeholder.

Local analysis

What matters in Golders Green

Freehold house or leasehold flat: the question that sets the route

Golders Green is unusual in holding two quite different refurbishment markets side by side: substantial Edwardian and interwar houses, and a significant stock of purpose-built mansion flats. On a freehold house, the constraints are physical and public — structure, party walls, and whatever Barnet's designation of your street means for external change. On a leasehold flat, the binding constraints are contractual and private: the lease defines what you may touch, the freeholder's consent is required, and there is no permitted development to fall back on. That difference reorders everything downstream — who must approve, in what order, on whose timetable, and what the drawings must show. We answer the tenure question before the design question, because a flat brief drawn as though it were a house brief simply meets the lease later, more expensively. The corollary is that a neighbour's completed project is a poor guide unless it shared your tenure and your street's designation.

Structure, services and first fix in an interwar house

In a house that has not been touched for decades, the coordination happens below the finishes. The original drainage layout — external soil stack, gully positions, below-ground runs of unknown condition — usually dictates where a new bathroom or utility can realistically go, and it is worth surveying before the plan is settled rather than after. The same applies to plant: a hot-water cylinder needs a home, a heat pump needs a location that works acoustically and for the neighbour relationship, and underfloor heating needs a floor build-up the existing joists can carry. Redundant chimney flues, cupboard depths and floor zones are the routes through which wiring, pipework and ventilation can reach the rooms above without chasing retained plaster and joinery to pieces. Designed on paper, this is straightforward; left to site, it is where budgets go. Setting the mechanical and electrical strategy alongside the structural drawings, rather than after them, is the single cheapest decision in a refurbishment of this kind.

Fire, sound and ventilation in a flat or an upper part above a shop

In flats the building regulations do work they never do in a house. Fire separation between dwellings sets the compartment lines and protects the escape route, and where a residential upper part sits above a commercial ground floor on the town-centre frontages, separation between the two uses and the access arrangement to the upper part become central to the design rather than a detail at the end of it. Sound is the second discipline: impact and airborne transmission between flats governs floor build-ups and often appears in the lease as well as in the regulations. Ventilation is the third, because internal bathrooms, shower rooms and utilities with no external wall depend on mechanical extract and its duct route. These three, plus the soil-stack position, usually decide a flat's layout more firmly than any aesthetic preference does. They also sit alongside the lease, which may impose its own standards over and above the regulations, so the two sets of requirements are read together at the start.

Thinking about a project in Golders Green?

Send the address and a short description. We will confirm the likely approval route and the drawings your project needs.

Local planning

Planning & conservation context

The London Borough of Barnet is the planning authority for Golders Green, and for a refurbishment the useful distinction is between what is genuinely internal and what shows. Internal alteration to an unlisted house is generally not development requiring planning permission, although the building regulations still apply in full; it is the external half of the scope — windows, doors, roof coverings, rooflights, render and boundary treatments — that engages planning. Mapping your scope across that line at the outset is what determines whether this is a building-regulations project, a planning project, or both.

Where the address falls within the Golders Green Town Centre Conservation Area, permitted development is reduced, visible alterations are scrutinised closely and a full householder application is often required. Other streets in the area retain permitted-development rights, so designation varies block by block and the position must be confirmed with Barnet for your exact property rather than assumed from a neighbour's precedent. Barnet identifies conservation areas as places of special architectural or historic interest and publishes character appraisal statements for many of them, advising owners to read the relevant appraisal before applying; it also explains that Article 4 Directions restrict some development rights, so an Article 4 check belongs on the pre-design list for any address here.

Two statutory regimes then run alongside whatever planning route applies. Householder planning applications are determined in around eight weeks under the national regime, and a lawful development certificate is the route where a permitted-development claim is being relied on and needs to be put beyond argument. Separately, the Party Wall etc. Act 1996 is triggered by building on the line of junction, or by excavating within three or six metres of a neighbour's structure — realistic on a semi-detached or terraced refurbishment where a steel bears into a shared wall or a new pad foundation is dug. Building regulations cover structure, fire safety, insulation, ventilation, drainage, stairs and waterproofing, and in flats they also govern fire separation and sound insulation between dwellings. We do not promise approval under any of them.

A Golders Green Town Centre Conservation Area exists and is recorded by Barnet, sitting close to Hampstead Garden Suburb. Where a refurbishment property sits within it, permitted development is reduced and visible alterations — window replacement, roof coverings, render, boundary walls — are assessed against the area's character rather than treated as free-issue; the designation and the relevant appraisal should be confirmed with Barnet for the exact address before any external element of the scope is priced.

Hampstead Garden Suburb lies nearby and is subject to especially strict planning control and the Trust's scheme of management, which can affect properties on its fringes. That is a further consent layered on top of Barnet's planning process, not a substitute for it, so a refurbishment on the Suburb edge should establish early whether the Trust's regime reaches the property — a planning permission would not carry its approval.

For the wider local-authority picture — policies, timescales and application routes — see planning in Barnet.

Illustrative study — street elevation

Architecture in Golders Green: FAQs

Do I need planning permission to refurbish a house in Golders Green?

For genuinely internal work to an unlisted house, generally not — internal alteration is usually not development requiring permission, though building regulations still apply. Planning is engaged by the external half of the scope: windows, doors, roof coverings, rooflights, render and boundary treatments. Because permitted-development rights vary block by block here, we confirm your property's status with Barnet before treating any external change as available.

Does the Golders Green Town Centre Conservation Area affect my refurbishment?

Where your address falls within it, yes — permitted development is reduced, visible alterations are scrutinised closely and a full householder application is often required for external change. Internal reconfiguration is usually far less constrained. Other streets in the area retain permitted-development rights, so the designation must be confirmed with Barnet for your exact property rather than inferred from a neighbour's project.

Can I reconfigure and refurbish a mansion flat in Golders Green?

Usually yes, within limits. Mansion-flat scope is normally internal — reconfiguration and refurbishment — governed by your lease and requiring freeholder consent, with structural walls that carry the block above restricting which walls can go. External alteration is generally not the leaseholder's to make. Party-wall agreement also applies where the work touches structure shared with neighbouring flats.

What is a Licence to Alter and will my lease need one?

It is the freeholder's formal consent to alter a leasehold flat, granted separately from anything the council decides. Most leases require it for structural change, drainage or soil-stack alterations, floor build-up changes and works affecting common parts. It typically comes with conditions and its own timetable, so we identify what your lease triggers early and run it alongside the design rather than after it.

Which comes first — planning, a Licence to Alter or building regulations?

It depends on the scope, and getting the order right is what keeps a project moving. Work that engages no planning may go straight to a building-regulations submission. Where a permitted-development claim is being relied on, a lawful development certificate puts it beyond argument. A leasehold flat needs freeholder consent regardless of the planning position. We set that sequence at the start rather than reacting to it.

Do I need a party wall agreement for internal refurbishment work?

Often, yes. Cutting a beam into a party wall, removing a chimney breast on a shared flank, or excavating a new pad foundation within three or six metres of a neighbour's structure all engage the Party Wall etc. Act 1996, as does building on the line of junction. It runs separately from planning and from any freeholder consent, so notifiable work is identified at design stage.

Can I replace my windows as part of the refurbishment?

That depends entirely on the property's designation, which should be confirmed with Barnet. Where the house sits within a conservation area or is reached by Hampstead Garden Suburb controls, window replacement is one of the most closely scrutinised external changes and matching materials and detailing are usually expected. Where thermal comfort is the driver, secondary glazing behind retained windows is often the more consentable route.

Can I lay a hard floor in my mansion flat?

Frequently the lease restricts it, and the building regulations govern sound transmission between dwellings in any case. Replacing carpet with timber or stone changes impact-sound reaching the flat below, so an acoustic build-up — resilient layer, floating deck, careful perimeter detailing — has to be designed and agreed with the freeholder rather than assumed. We resolve floor build-ups against the existing structural depth before the layout is fixed.

Do I need to move out while the house is refurbished?

For a full refurbishment involving structural opening-up and complete service renewal, usually yes, at least for the messiest stages — a vacant house is faster, safer and generally cheaper to build in. Lighter schemes can sometimes be phased around occupation. We advise on decant versus phasing at the outset so that the programme, the contract and the disruption are planned rather than discovered on site.

How much does a house refurbishment in Golders Green cost?

Fees depend on scope, tenure and the property — a whole-house refurbishment with structural work and full service renewal differs greatly from a mansion-flat reconfiguration within a lease. Our published packages start from a fixed fee, confirmed once the scope is clear, and exclude council and specialist consultant fees such as planning charges, structural engineering, party wall and any freeholder or Licence to Alter costs. See our packages page for the structure.

Plan a refurbishment in Golders Green

Tell us the address, whether the property is a freehold house or a leasehold flat, and how you want it to work. We will confirm the consent route — Barnet planning, a lawful development certificate, a Licence to Alter or building regulations — and set out the survey, drawings and approvals your refurbishment will need.

Call 020 8054 8756Send Details