Ornate red-brick Victorian houses beside a newer red-brick block of flats with bay windows and balconies, set behind brick garden walls on a London street.

NW3 · Hampstead · Camden

Planning and building regulation drawings in Hampstead (NW3)

NW3 spans three different places, and the right first question depends on which one you live in. Hampstead has Georgian houses in the old village core and substantial Victorian red-brick villas on roads such as Fitzjohns Avenue and Netherhall Gardens. Belsize Park is mostly mid-to-late Victorian, with large stucco-fronted and red-brick villas, Edwardian mansion blocks and generous rear gardens; its streets include South Hill Park, Constantine Road and Roderick Road. Gospel Oak sits below Hampstead Heath, where two-storey Victorian terraces and cottages share the ground with post-war council estates.

MCIAT chartered technologists
London Borough of Camden granted 88% of 404 householder applications
Drawings in about 7 days

Across much of NW3, big villas were long ago divided into flats. That changes the nature of the work. A flat owner in a converted villa has no householder permitted development rights at all, so a rear addition or a roof change is a planning application, with the freeholder's consent and party wall matters running alongside. Purely internal work is not development, although listed building consent can still apply. Where a house is still a single dwelling, bulky rear and roof additions are resisted in Belsize Park where they would be seen from the Heath fringe or between the tall villas. Mature trees near the Heath are often protected, which can affect where an extension can go.

Gospel Oak has its own picture. Conservation pockets such as Mansfield and Inkerman sit beside estate housing, so the rules change from one street to the next. Small Victorian footprints limit how deep a rear extension can sensibly go, and on estate stock leasehold terms and the freeholder's consent shape what can be altered. We start every NW3 job by checking the street, the tenure and the trees.

Planning in Hampstead: what to know before you apply

Camden applies a basement policy across the district, and basement works lose their permitted development rights. In the Hampstead, Belsize and Fitzjohns Netherhall conservation areas, further non-immediate Article 4 directions remove additional rights, so even modest external changes may need permission. Listed buildings are numerous in the village core, and listed building consent is needed alongside planning. In Belsize Park, front elevations, roof profiles and materials are controlled through the Belsize and Parkhill designations. Gospel Oak varies street by street, with Mansfield and Inkerman among its conservation pockets. Because designation can differ between neighbouring roads, we check the specific address for conservation status, directions, listing and tree protection before choosing a route, and we prepare drawings to suit Camden's validation requirements.

Applications are decided by London Borough of Camden — its planning pages.

Check your route

Does your Hampstead project need planning permission?

Route check · Hampstead (NW3)

ProjectProperty

Listed building?

Conservation area?

Likely permitted development — no planning applicationNeeds checking

A single-storey rear extension up to 4 m deep on a detached house, or 3 m on any other house, is Class A permitted development subject to the height and materials conditions.
An Article 4 direction applies here and may withdraw this freedom — the schedule must be checked before relying on it.
One or more constraints are unknown — we check the council's registers as part of the free appraisal.
Where permitted development applies, a lawful development certificate proves it for lenders and buyers.

Sources: GPDO 2015, Schedule 2, Part 1 · Planning Portal — common projects · Building Regulations 2010 — when approval is needed

This is a first-pass indication from the national rules, not planning advice for your property. Your council's registers, any Article 4 schedule and the exact dimensions decide it — the free appraisal checks all three before we recommend a route.

Confirm it with a free appraisal

Hampstead (NW3) in numbers

What London Borough of Camden has decided, and what NW3 is built of — the two facts that shape every job here.

Householder planning decisions — London Borough of Camden

Hampstead (NW3) applications are decided by London Borough of Camden; these are its published householder figures for the last four quarters.

Householder applications decided2025 Q2 to 2026 Q1	404
Granted	357
Refused	47
Grantedof 404 decisions · England 90%	88%
Decided within 8 weeksof 230, excluding prior approvals	87%

Source: Ministry of Housing, Communities and Local Government (PS2 district planning application statistics). Open Government Licence v3.0 Extracted 2026-09-22.

Permitted development prior approvals — London Borough of Camden

How the larger-home-extension route has fared with London Borough of Camden, which decides NW3 notifications.

Larger home extension prior approvals — not required2024 Q2 to 2026 Q1	1
Prior approval granted	6
Prior approval refused	1

Source: Ministry of Housing, Communities and Local Government (PS1 district planning application statistics). Open Government Licence v3.0 Extracted 2026-09-22.

Planning appeals — London Borough of Camden

Refusals in NW3 can be appealed to the Planning Inspectorate; this is London Borough of Camden's householder appeal record.

Householder appeals determined2021–2026	119
Allowed	38
Allowedof 119 · England 36%	32%

Source: Planning Inspectorate appeals casework. Open Government Licence v3.0 Extracted 2026-09-22.

Conservation areas and Article 4 directions — London Borough of Camden

Register counts for London Borough of Camden. A count describes what the council has published, never a rank against another council.

Conservation areas in the register40 dated, 1968–2008	40
Article 4 directions in the register	21
Areas covered by an Article 4 direction	21

Source: MHCLG Planning Data Platform. Open Government Licence v3.0 Extracted 2026-09-22.

What NW3 is built of

Residential building form across Hampstead (NW3), from 237 classified buildings — the fact that decides party walls, side returns and loft headroom before any policy does.

Attached on more than one side	43%
Attached on one side	37%
Detached	20%
Median building footprint	92 m²
Addresses per buildingAbove about 2 means flats and maisonettes dominate	2.82
Buildings classified	237

Source: Ordnance Survey National Geographic Database (derived statistics). Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Extracted 2026-09-22.

Day 0Measured survey of your Hampstead property — or your existing plans if you have them.
About 7 daysDrawings issued for your approval. Free redraws until you are happy.
SubmissionWe validate against London Borough of Camden’s checklist and submit on your behalf.
Council: 8-week targetHouseholder applications carry an 8-week statutory target. London Borough of Camden decided 87% of 230 recent householder applications inside it.

Source: Ministry of Housing, Communities and Local Government (PS2 district planning application statistics). Open Government Licence v3.0 Extracted 2026-09-22.

Neighbourhoods

Streets and neighbourhoods in NW3

Hampsteadpredominantly Georgian and Victorian Belsize Parkpredominantly mid-to-late Victorian Gospel Oaka mix of Victorian and post-war

Nearby

Nearby postcode districts

Cricklewood NW2Hendon NW4Camden Town NW1Kentish Town NW5Golders Green NW11Kilburn NW6Willesden NW10Mill Hill NW7

FAQ

Hampstead (NW3) — FAQs

I live in a flat in a converted Hampstead villa. Can I alter my part of the building?+

Possibly, but flats carry no permitted development rights, so changes are assessed on their own merits and may need planning permission, and listed building consent where relevant. You will also need the freeholder's agreement, and often a party wall process. We draw the scheme and flag these dependencies early.

Do protected trees near the Heath affect an extension in Belsize Park?+

They can. Trees and garden planting close to the Heath are frequently protected, so a rear extension must be positioned and built with the roots and canopy in mind. We check protection status at the start so the plans avoid a late redesign.

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