Planning Permission in Camden: What You Can (and Can't) Build in 2026

Camden is one of the most planning-restrictive boroughs in London. Extensive Conservation Areas covering Hampstead, Belsize Park, and Primrose Hill, sweeping Article 4 Directions, and a detailed design SPD mean that many projects which would be Permitted Development elsewhere require a full application here. This is what homeowners need to know in 2026.

Camden's planning authority handles one of the highest volumes of householder applications in London, and it does so with some of the most detailed policy documentation of any English local planning authority. The borough's Local Plan, Residential Extensions SPD, and the appraisals for its 38 designated Conservation Areas create a layered framework that officers apply carefully — and that homeowners frequently underestimate. Understanding how Camden thinks before you commission drawings is not optional here; it is essential.

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Quick Summary

What homeowners should know

Camden has 38 Conservation Areas — including Hampstead, Belsize Park, Primrose Hill, Highgate, and Gospel Oak — covering a very large proportion of the borough's residential streets. Properties within them face significant restrictions on extensions, dormers, and external alterations, almost all of which fall outside Permitted Development.

Article 4 Directions in Camden withdraw PD rights across much of the borough, particularly in Conservation Areas. The specific rights removed vary by direction — always check your exact address, not just the neighbourhood, before assuming any works are PD.

Camden's Residential Extensions SPD sets out detailed design expectations including massing, roof form, materials, fenestration, and relationship to neighbours. Design quality is a genuine material consideration — not just a preference — and poor design is a documented and common reason for refusal in Camden.

When it may be permitted development

These are the common features that keep a project on the simpler route.

Internal works: Full planning permission is not required for internal alterations to houses in Camden, including structural changes, loft insulation, or bathroom installation — provided the building is not listed and no change of use is involved.

Roof lights (Velux-style) on rear slopes: In parts of Camden not covered by Conservation Area Article 4 Directions, roof lights that do not project more than 150mm above the plane of the roof can remain PD — making them one of the more reliable ways to bring light into a loft without a full application.

Small outbuildings in rear gardens: Single-storey garden structures within PD volume and height limits can remain PD in some parts of Camden, though the restricted curtilage of many Camden properties (particularly in Hampstead) means the 50% curtilage coverage limit is quickly reached.

Rear extensions in non-Conservation Area streets: On streets not covered by a Conservation Area designation or an Article 4 Direction, single-storey rear extensions within 3m (terraced/semi) or 4m (detached) can remain PD — but this must be verified at address level, as the proportion of Camden streets that are genuinely outside these restrictions is smaller than most boroughs.

When planning permission is more likely

These are the usual triggers that push a scheme beyond straightforward PD rights.

Conservation Area coverage is among the most extensive of any London borough: 38 Conservation Areas mean that a very large share of Camden's housing stock sits within a designation that restricts or removes most PD rights. Dormers, side extensions, cladding changes, and many external alterations all require full applications within these areas.

Article 4 Directions compound Conservation Area restrictions: In most of Camden's Conservation Areas, Article 4 Directions have been made specifically withdrawing PD rights for windows, doors, roof extensions, side extensions, and external materials — meaning that works requiring planning permission in Camden often far exceed what residents expect.

Listed Buildings: Camden has a significant concentration of listed buildings, particularly in Hampstead, Bloomsbury, and Highgate. Works affecting a listed building or its curtilage require Listed Building Consent in addition to planning permission. This is a separate legal requirement that applies regardless of scale.

Basement Extensions: Camden has restrictions on basement development beyond those in most other boroughs. Its basement policy requires applicants to demonstrate the structural safety of the proposed works, submit a basement impact assessment covering drainage and ground movement, and in some cases commission an arboricultural survey where trees are close to the excavation zone.

Two-Storey and Side Extensions: Two-storey rear extensions and side extensions almost always require full planning applications in Camden. Side extensions in particular are viewed cautiously where they would reduce the gap between properties or harm the rhythm of a terrace.

Flats and Maisonettes: A high proportion of Camden's housing stock is flats. Flats have no standard PD rights for extensions, meaning any structural alteration to the envelope of a flat requires a full planning application.

What CanUBuild checks

Faster answers before you speak to an architect or builder

The tool is designed to answer the first question most homeowners have: is this worth pursuing, and what is most likely to block it?

Address-Level Constraints in Camden: We flag Conservation Area boundaries, Article 4 Direction coverage, Listed Building status, and flood risk at your specific address — the designations that most frequently remove PD rights and trigger full applications in Camden.

Nearby Camden Planning Decisions: Camden's planning history is extensive and detailed. We surface real approved and refused applications from properties close to yours — the single most useful dataset for predicting how your application will be viewed by the same officers.

Project Feasibility Before Architect Fees: Camden is one of the boroughs where a feasibility check before commissioning drawings makes the greatest difference. The gap between what feels like a reasonable extension and what Camden will approve can be significant — our tool helps you understand that gap in seconds.

FAQ

Questions people ask before starting a project

How many Conservation Areas does Camden have?

Camden has 38 designated Conservation Areas — more than almost any other London borough. They include some of the most recognisable residential streets in London: Hampstead, Belsize Park, Primrose Hill, Highgate Village, Gospel Oak, Dartmouth Park, and many others. The boundaries vary significantly in extent. A property within a Conservation Area faces restrictions on most external alterations that go well beyond standard Permitted Development limits.

Can I add a rear dormer to my Camden house without planning permission?

In most cases in Camden, no. The borough's extensive Conservation Area coverage means that the majority of Camden houses sit in areas where PD rights for roof extensions have been withdrawn by Article 4 Directions. Even where a property is technically outside a Conservation Area, Camden's Article 4 Directions may still apply to specific roof works. A full planning application is required for most dormers in Camden, and the council applies detailed design scrutiny to any roof alteration.

Is Camden's planning department slower than other London boroughs?

Camden has a reputation for longer-than-average decision times, particularly for applications that require detailed design review or Conservation Area Officer involvement. The statutory 8-week determination period is frequently extended by agreement. Pre-application advice — which Camden offers for a fee — is strongly recommended for anything beyond a straightforward small extension. It gives written officer feedback before formal submission and meaningfully reduces the risk of a protracted application.

What does Camden's Residential Extensions SPD require?

Camden's Residential Extensions and Alterations SPD sets out detailed design expectations covering massing, scale, roof form, materials, fenestration proportions, and relationship to the host building and its neighbours. It requires that extensions respond to and respect the character of the existing building and its street context. Unlike some other boroughs, Camden treats design quality as a genuine reason for refusal — not just a material consideration to be balanced. Applications accompanied by a thorough design-and-access statement that directly engages with the SPD fare significantly better than template submissions.

Do I need planning permission for a basement extension in Camden?

Yes. Basement extensions in Camden require a full planning application and are subject to the council's basement policy, which requires a structural impact assessment, drainage strategy, and in some cases an arboricultural survey. Camden has tightened its basement policy following structural concerns on several high-profile projects. While approvals are achievable, the process is more demanding than above-ground work, and the council may impose conditions relating to construction management, vibration monitoring, and drainage.

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