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Planning guide · Lewisham

Blackheath and Deptford: 30 protected areas across Lewisham

Designation changes the route, and the route changes the odds. Of 2,037 householder decisions Lewisham took from April 2023 to March 2026 it refused 280, or 13.7%, and 330 of 1,782 minor ones, 18.5%. On larger-extension prior approvals, the permitted-development route that designation takes away from you, it refused 135 of 305: 44.3%. This page covers the borough's 30 conservation areas — what changes inside them, how a Heritage Statement is expected to read, and which alterations still qualify. Source: MHCLG live planning statistics.

Quick answer

Borough
Lewisham
Planning authority
Lewisham Council
Conservation areas
30
Statutory determination
8 weeks
Our approval rate
98% first time

Architectural design tools and technical drawings — planning drawings in Lewisham

Which parts of Lewisham are designated?

Thirty conservation areas covering 705 hectares, concentrated in the older suburbs: Blackheath is the largest at 181 hectares, Brockley next at 115 and Telegraph Hill at 76. The borough also carries 89 Article 4 areas and 364 listed buildings, and approved 86.3% of householder applications.

MeasureLewishamLondon
Conservation areas301,141
Designated area705 ha
Largest areasBlackheath 181 ha, Brockley 115 ha
Article 4 areas89
Listed buildings364
Householder approval86.3%83.0%

Sources: conservation area counts and boundaries from the planning.data.gov.uk register, retrieved 1 September 2026, with hectares computed from the published boundaries. Article 4 and listed building counts from the planning.data.gov.uk designation registers. Decision figures from MHCLG PS1 and PS2, twelve quarters to March 2026. Open Government Licence v3.0.

How do I test a Lewisham postcode against the designated boundaries?

What follows is the boundary line itself, taken from the national register, with Lewisham’s Article 4 areas layered over it. The postcode search does its work locally, in your browser. One limit is worth stating plainly: the shapes are simplified to draw cleanly, so where a boundary appears to clip the rear of a plot, the map is not making a decision — the council’s mapping is what settles a case on the edge.

A single area dominates the borough’s designated land. Blackheath covers 180.7 hectares of the 704.9 that Lewisham has designated in total, so more than a quarter of it sits in one place; Stanstead Grove, at the other extreme, covers three-tenths of a hectare. Article 4 coverage is heavy here by comparison — 89 areas are published for Lewisham, which makes permitted development a weaker assumption in this borough than the national rules would suggest, and worth checking before a rear extension is designed rather than after. Twenty-nine of the areas have a council document filed against them, and that is the thing to read first: it is where the acceptable materials, window types and roof forms are set out, and it is what an officer will measure your drawings against.

Drawn from two planning.data.gov.uk datasets — conservation-area and article-4-direction-area — downloaded 15 August 2026 and checked again 1 September 2026. Contains public sector information licensed under the Open Government Licence v3.0

In detail

Answers for Lewisham

How many conservation areas does Lewisham have?

Thirty conservation areas are designated in Lewisham. Blackheath, Deptford High Street, Forest Hill, Hither Green and Lee Green are among them.

What changes need planning in a Lewisham conservation area?

Any external alteration visible from a public space typically requires full planning permission inside a conservation area: roof additions, dormers, replacement windows, rendering, hardstanding, and demolition. Internal works generally do not, unless the property is also listed.

Do I need a Heritage Statement in Lewisham?

Yes. Anything inside a conservation area needs a Heritage Statement, and a generic one gets nowhere. It has to engage with whatever character appraisal the council has published for that area, identify the heritage assets the work touches, and explain how the design preserves or enhances character rather than merely avoiding harm. We write it as part of every conservation-area application.

Can I have a roof extension or mansard in a Lewisham conservation area?

Across London's conservation areas, rear mansards and rear dormers get approved often enough, provided the design follows the roofscape the terrace already has; Islington, Hackney, Southwark, Lambeth and Tower Hamlets all publish guidance saying as much. A dormer on the front elevation is a different proposition, and is refused almost everywhere.

How long does conservation area approval take in Lewisham?

The statutory determination period is 8 weeks on a householder application to Lewisham. In practice the conservation officer consultation adds another two or three weeks on top, which puts 11 to 14 weeks from validation to decision as the realistic expectation. The council also agreed an extension of time on 1,449 of its 4,264 decisions, 34.0%, so that clock gets reset by agreement fairly often.

Related guides for Lewisham
A printed planning application drawing set — proposed elevations, floor plans and the os location plan with the site outlined in red — conservation area planning in Lewisham
The planning set that goes to the council through the Planning Portal: proposed elevations, plans, and the OS location plan with your site outlined.
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Which postcode districts around Lewisham do we cover for conservation area application work?

Each Lewisham postcode below, with the stock it contains and the authority that validates a conservation area application at addresses inside it. The fees listed are England's 2026 statutory rates, not what an application costs to prepare.

PostcodeAreaDominant stockWhat it means for a conservation area application
SE3Blackheath / KidbrookeGeorgian villas, Victorian terracesSE3 is shared. Blackheath and Kidbrooke addresses fall either to Greenwich Council or to Lewisham Council; the boundary runs across the heath, and it is the address rather than the district that decides.
SE4BrockleyVictorian and Edwardian terracesSE4 is Brockley. Lewisham Council handles the application, and the Brockley conservation area boundary is what decides whether designation bites at a given address.
SE6Catford / Bellingham1930s semi-detached, post-war flatsCatford and Bellingham make up SE6. The application goes to Lewisham Council, which applies whichever designations happen to reach the address.
SE8DeptfordGeorgian terraces, post-war estates, new-buildDeptford addresses in SE8 are decided by Lewisham Council, applying whichever Local Plan policies govern that quarter of the borough.
SE12Lee / Grove ParkVictorian and Edwardian terraces across BrockleySE12 crosses a boundary. Lee and Grove Park addresses go to either Lewisham Council or Bromley Council, so which of the two owns yours is worth settling before SE12 drawings go anywhere.
SE13Lewisham / Hither GreenVictorian terraces, post-war flatsAddresses in SE13, covering Lewisham and Hither Green, are determined by Lewisham Council under its own Local Plan.
SE14New CrossVictorian and Edwardian terraces across BrockleyNew Cross sits in SE14, and Lewisham Council determines applications there under its own Local Plan policies.
SE23Forest Hill / Honor OakVictorian villas, Edwardian terracesSE23 is Forest Hill and Honor Oak, entirely within the borough, so Lewisham Council handles the application and works out which designations touch the address.

How does a conservation area application differ street by street across Lewisham?

How deep the plot runs, what the walls are made of and how steeply the roof pitches all differ on every Lewisham street, and what a conservation area application can realistically ask for follows from them.

What local planning policy applies to a conservation area application in Lewisham?

Lewisham conservation designations: 30 in total, with Lee Green, Blackheath and Deptford High Street among them. Designation removes the permitted-development route, so work then needs a £548 householder application, determined over 8 weeks, rather than the £249 prior approval that runs to 42 days. Which of the 30 applies is a question about the address rather than the postcode, and it is the character appraisal for that specific area the design has to answer to.

No blanket Article 4 over Lewisham: Lewisham Council has not withdrawn permitted development across Lewisham, so a conservation area application outside a Lewisham conservation area usually keeps it. The £274 Lawful Development Certificate is still the document a SE4 owner wants on file.

The building fabric around Lewisham: Victorian and Edwardian terraces across Brockley, Honor Oak, Forest Hill; 1930s semi-detached in Catford and Hither Green; post-war mixed in Deptford. Generally permissive planning compared to central boroughs; loft conversions and side-return extensions routinely approved under PD. A conservation area application in Lewisham is scoped against that stock first.

Who decides a conservation area application on the edge of Lewisham?

Sources for this Lewisham conservation area application page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.

Conservation area planning in Lewisham — a London terraced street of the type we survey
A london terraced street of the type we survey — conservation area planning in Lewisham.

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