Rear extension in Camden
Often yes, but it depends on exactly what you're proposing, not just your postcode. Camden's conservation areas remove side extensions and any two-storey rear addition from permitted development outright, but a single-storey rear extension within the standard 3m (attached) or 4m (detached) limits can still qualify — Camden's own Article 4 directions in streets around Hampstead and Belsize target front-and-side changes like windows and boundary treatments, not the rear allowance. Flats have no permitted development rights at all, so confirm the exact address before assuming either way.
Precedent-driven: hold to your street's established projection depth and match the stock brick.
Camden's terraced stock varies street by street — Bloomsbury's Georgian runs, the Victorian terraces around Kentish Town and Camden Town, the larger villas nearer Belsize Park and Hampstead — so there's no single 'established depth' that applies across the borough. Officers are comparing your proposal against what's already been consented on your specific row, which makes your own street's planning history more useful than any general rule of thumb. It's also why Camden's case officers respond well to applications that arrive with a daylight assessment and a matched-materials specification already attached, rather than produced after they ask.
What actually applies in Camden
Conservation areas in Camden
Real · planning.data.gov.ukEvery designated conservation area in Camden from the official dataset — inside one, permitted development narrows and design scrutiny rises.
- Alexandra Road
- Bartholomew Estate
- Belsize
- Bloomsbury
- Camden Broadway
- Camden Square
- Camden Town
- Charlotte Street
- Dartmouth Park
- Denmark Street
- Elsworthy
- Eton
- Fitzjohns Netherhall
- Fitzroy Square
- Hampstead
- Hanway Street
- Harmood Street
- Hatton Garden
- Highgate Village
- Holly Lodge Estate
- Inkerman
- Jeffrey's Street
- Kelly Street
- Kentish Town
- Kings Cross St Pancras
- Kingsway
- Mansfield
- Parkhill
- Primrose Hill
- Priory Road
- Redington Frognal
- Regents Canal
- Regents Park
- Rochester
- Seven Dials (Covent Garden)
- South Hampstead
- South Hill Park
- St Johns Wood
- West End Green
- West Kentish Town
Source: planning.data.gov.uk · Open Government Licence. Boundaries are checked at address level by the area report.
Article 4 directions in Camden
Real · planning.data.gov.ukArticle 4 directions in Camden remove specific permitted development rights street by street — the single most common reason a "no permission needed" project turns out to need one.
- 115, 117, 119, 121A, 127-129 Parkway and 1 Park Willage East
- 13-51 (odd) & 16-60 (even) Belsize Avenue
- 147 Kentish Town Road
- 187 Kentish Town Road
- 32-66 (even) & 72-90 (even) South Hill Park, NW3 (South Hill Park Estate Conservation Area)
- 33 York Rise, NW5 (Dartmouth Park Conservation Area)
- 67 Fitzjohns Avenue area
- Basements
- Belsize Conservation Area (various properties)
- Belsize Conservation Area Non-immediate Article 4
- Commercial, Business, and Service (Use Class E) to residential (Use Class C3) (in CAZ)
- Commercial, Business, and Service (Use Class E) to residential (Use Class C3) (outside CAZ)
- Fitzjohns/Netherhall Conservation Area Non-immediate Article 4
- Frognal Way
- Hampstead Conservation Area (excl. Frognal Way) (various properties)
- Hampstead Conservation Area (excl. Frognal Way) Non-immediate Article 4
- Launderettes to dwelling houses (Sui Generis to C3)
- Primrose Hill Conservation Area (various properties) - UNDER REVIEW
- Redington/Frognal Conservation Area Non-immediate Article 4
- Swiss Cottage Conservation Area (various properties)
Source: planning.data.gov.uk · Open Government Licence. Boundaries are checked at address level by the area report.
Prices: HM Land Registry UK House Price Index, November 2025 · Open Government Licence.
The planning route — PD or permission?
Permitted development (GPDO Class A) covers single-storey rear extensions up to 3m beyond the original rear wall on attached houses and 4m on detached, with a maximum height of 4m. The 'larger home extension' route extends this to 6m/8m through prior approval with neighbour consultation — but that larger route is not available in conservation areas.
In conservation areas, the basic 3m/4m single-storey rear PD allowance usually survives — what conservation-area status removes is side extensions and two-storey rear extensions. An Article 4 direction can remove more, but Camden's directions in Hampstead and Belsize target front-and-side appearance (solar panels, window changes, boundary treatments), not the single-storey rear allowance. Flats have no PD rights at all. Two-storey rear extensions in conservation areas always need full permission.
Practical rule across London: check the address first. If a conservation area or Article 4 direction applies, budget for a full householder application decided on design, neighbour daylight (the 45-degree test) and materials.
What it really costs
| Cost per m² (low — straightforward site) | £3,000 |
| Cost per m² (expected) | £3,800 |
| Cost per m² (high — conservation spec, hard access) | £4,600+ |
| Typical build cost (12–18m² single storey) | £36,000 – £83,000 |
| Professional fees, surveys, party wall (add) | 10–18% of build |
Indicative London ranges calibrated from real project data. Conservation-area specifications (matching stock brick, lime mortar, bespoke glazing) and restricted rear access are the two biggest cost drivers. VAT not included.
Realistic timeline
| Design and drawings | 4–8 weeks |
| Planning decision (full application) | 8–12 weeks (8-week statutory target) |
| Prior approval route, where available | 42 days |
| Party wall agreements | 4–10 weeks (parallel) |
| Build | 3–5 months |
What catches people out in Camden
The 45-degree daylight test does real work on Camden's tighter Victorian plots, trimming depth before a design ever reaches committee. Conservation-area material conditions — brick match, mortar type, roof finish — are the detail that surfaces after pricing rather than before, so get them confirmed at design stage, not after a contractor has quoted.
Camden planning, area by area
Almost certainly yes — assume a full householder application.
Do I need permission? →Usually a full application — and the roof form decides it.
Do I need permission? →Yes — assume a full planning application, and expect Camden's strict basement policy.
Do I need permission? →If your Hampstead property is listed — and a high proportion of the village's Georgian and early-Victorian houses are — then listed building consent is needed for any works that affect its special character, inside and out, separately from and on top of planning permission.
Do I need permission? →Usually a full householder application — and your tenure is the first question.
Do I need permission? →Usually a full application — and often not available at all if you're in a converted flat.
Do I need permission? →Yes — a full planning application, under Camden's strict basement policy.
Do I need permission? →Some of Belsize Park's grand villas are listed, and if yours is, listed building consent is needed for works affecting its character inside and out — separate from and additional to planning permission.
Do I need permission? →Usually a full householder application, and the constraint is as much the neighbours as the conservation area.
Do I need permission? →Usually a full application — permitted-development loft rights are removed in the conservation area and the Article 4 directions reinforce it.
Do I need permission? →Yes — a full planning application under Camden's strict basement policy, and the tight terraces make the party-wall and neighbour dimension acute.
Do I need permission? →A number of Primrose Hill's terraces are listed, and if yours is, listed building consent is required for works affecting its character inside and out — additional to planning permission.
Do I need permission? →Rear extension in Camden, district by district
First check: Whether it's permitted development or needs a planning application
Service guide →First check: Whether it's permitted development or needs a planning application
Service guide →First check: Whether it's permitted development or needs a planning application
Service guide →First check: Whether it's permitted development or needs a planning application
Service guide →First check: Whether it's permitted development or needs a planning application
Service guide →Rear extension in Camden, asked straight
How much does a rear extension cost in Camden?
Does a Camden conservation area automatically rule out permitted development for a rear extension?
What projection depth will Camden planners accept?
How long does a rear extension application take in Camden?
Do I need a party wall agreement for a Camden rear extension?
What applies at your address?
Borough-level rules only narrow it down. Enter a Camden postcode for the live constraint check — conservation area, Article 4 and sold-price comparables, cited to source.
Planning Permission Checker provides planning and cost intelligence for early feasibility only. It is not legal, planning, valuation, architectural, structural, or surveying advice. All estimates are indicative and must be verified by qualified professionals before purchase, design, planning submission, or construction.
Cost estimates are indicative only — not a quotation. Final price depends on survey, specification, structure, access, party wall matters, VAT, professional fees, and contractor availability.
Planning outcomes are not guaranteed. Local planning authorities make final decisions.