House Extensions · SE13 Lewisham
Lewisham controls the Corbett Estate and Ladywell conservation areas; SE13 is a strong, well-priced family-extension market.
Working across the whole borough rather than just this area? See house extensions in Lewisham.
House extensions in Lewisham are dominated by single-storey rear and side-return additions on SE13's victorian and edwardian terraces and bay-fronted houses, with double-storey and wrap-around schemes where the plot allows. Lewisham Council weighs depth, height and neighbour daylight; many extensions across Lewisham, Hither Green, Ladywell, Blackheath fringe are Permitted Development, which we confirm with a Lawful Development Certificate before you build.
The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with detailed technical phase, ideal for victorian and edwardian terraces and bay-fronted houses typical of Lewisham.
Across Lewisham, Hither Green, Ladywell, Blackheath fringe in SE13, the dominant property is victorian and edwardian terraces and bay-fronted houses around lewisham and hither green, with post-war estates and new-build near the centre. That stock shapes what house extension drawings looks like here: the right approach for a period terrace differs from a mansion-block flat or a new-build, and Lewisham Council judges each on design quality and neighbour impact. We survey the specific Lewisham property, confirm the planning route — Permitted Development, a Lawful Development Certificate, or full planning — and draw a council-ready set tailored to the SE13 streetscape.
Housing stock in SE13: Victorian and Edwardian terraces and bay-fronted houses around Lewisham and Hither Green, with post-war estates and new-build near the centre.
Within the district: Lewisham, Hither Green, Ladywell, Blackheath fringe.
Streets we know in SE13: the Corbett Estate roads in Hither Green, the Ladywell streets and Manor Lane. Each road has its own building line, boundary treatment and precedent that Lewisham Council weighs when assessing a house extension drawings scheme.
Conservation areas: Hither Green (Corbett Estate), Ladywell, Lewisham Park. Inside these, most external work needs full planning and a Heritage Statement.
Getting around SE13: Lewisham rail and DLR, plus Hither Green and Ladywell rail to London Bridge and Charing Cross.
Regeneration: Lewisham falls within or beside the Lewisham town centre regeneration, which shapes local planning policy and design expectations.
Property values: houses and flats are not one market. Across Lewisham in 2025 a terrace sold at a median of £655,000 and a flat at £385,000; the £445,000 all-property midpoint for this district lands between the two precisely because it counts both.
Borough character: Generally permissive planning compared to central boroughs; loft conversions and side-return extensions routinely approved under PD.
Measured existing survey, photographic record, Article 4 and conservation check specific to Lewisham before we quote.
2–3 design options at concept stage — alternative layouts, glazing, roof forms.
Site location plan, existing and proposed plans, elevations, sections, D&AS where required.
Part L thermal, Part B fire, Part M accessibility, structural strategy.
Steel beam, foundation, lintel design. Chartered engineer sign-off.
Party Wall notices where needed; Thames Water Build Over Agreement where within 3m of a public sewer.
Single planning or building-regs submission.
Planning + building regs + structural.
Listed, conservation or complex sites.
Yes. The Corbett Estate's Edwardian bay-fronted terraces suit side-return and rear extensions and loft conversions, but the estate is a conservation area, so changes are assessed on materials and form, often by full planning. We design to match the original detailing and submit to Lewisham.
Usually yes outside the conservation areas — a rear dormer or L-shape over the back addition within the volume allowance, confirmed by a Lawful Development Certificate. Inside the Corbett Estate or Ladywell designations, roof changes need full planning. We confirm which applies to your road.
Family-house extensions and lofts on the Victorian and Edwardian terraces around Hither Green and Ladywell — side-returns, rear additions and dormers as families grow. With houses around £650,000-£900,000, SE13 offers strong value, and a council-ready scheme protects both approval and resale.
Lewisham's centre is being substantially rebuilt with new homes and improved public realm, supporting values across SE13, but it mainly affects the centre rather than the residential terraces. For a house project the relevant controls are Permitted Development limits and the local conservation area, which we check for your address.
Lewisham Council charges its own statutory application fee (currently £548 for a householder planning application, £610 for a full application). We quote the drawings as one fixed price and the free site survey covers every SE13 address.
For a SE13 project across Lewisham, Hither Green, Ladywell, Blackheath fringe, expect roughly 3–4 weeks from instruction to submission: week 1 the measured survey, weeks 2–3 the drawings and your revisions, then validation and the statutory determination by Lewisham Council (8 weeks for a householder application). We carry the Lewisham application through every officer query to the decision.
Lewisham (SE13) sits primarily in Lewisham, so applications are decided by Lewisham Council. Conservation areas within SE13 include Hither Green (Corbett Estate), Ladywell, Lewisham Park, where full planning and a Heritage Statement are required. We confirm the planning route for your exact address before quoting.
Almost always. Any structural work behind house extension drawings in Lewisham — new openings, steel beams, loft floors, foundations — needs Building Regulations approval covering structure (Part A), fire escape (Part B) and insulation (Part L), submitted to Lewisham Council Building Control or an approved inspector. On SE13's typically terraced and semi-detached stock, a Party Wall notice to adjoining neighbours is normally required before the steelwork. We coordinate both as part of the Complete package.
In value terms, yes. The bigger risk is an unapproved or non-compliant scheme — which is why council-ready drawings and a clean Building Control sign-off matter on SE13 homes.
If your site sits close to the edge of the borough, it is worth checking the authority next door. Browse everything we do in SE3, SE4, SE6, SE12, SE23 and SE26.
Pick a slot that suits you. No obligation and no sales pressure, just straight answers on your planning route.
Every SE13 postcode district we draw in, the stock that dominates it and the authority that validates a house extension there. SE13 fees below are the statutory England rates for 2026, not house extension estimates.
| Postcode | Area | Dominant stock | What it means for a house extension |
|---|---|---|---|
| SE13 | Lewisham / Hither Green | Victorian terraces, post-war flats | A house extension at an SE13 address in Lewisham / Hither Green is determined by Lewisham Council under its own Local Plan policies for Lewisham / Hither Green. |
| SE13 | Lewisham | Victorian terraces, post-war flats | Lewisham sits inside SE13; house extension proposals here are determined by Lewisham Council. |
| SE13 | Hither Green | Edwardian terraces, 1930s semi-detached | Hither Green sits inside SE13; house extension proposals here are determined by Lewisham Council. |
| SE4 | Brockley | Victorian and Edwardian terraces | Adjoining district to SE13, also inside Lewisham for house extension purposes. |
| SE6 | Catford / Bellingham | 1930s semi-detached, post-war flats | Adjoining district to SE13, also inside Lewisham for house extension purposes. |
| SE8 | Deptford | Georgian terraces, post-war estates, new-build | Adjoining district to SE13, also inside Lewisham for house extension purposes. |
| SE12 | Lee / Grove Park | mixed stock | Adjoining district to SE13, also inside Lewisham for house extension purposes. |
Roof pitch, wall build-up and plot depth change every few SE13 streets, and each one changes what a house extension can achieve at that address.
Conservation areas covering SE13 (Lewisham / Hither Green): Lewisham Council runs 30, and Blackheath, Deptford High Street, Forest Hill are the ones SE13 (Lewisham / Hither Green) owners meet most. A house extension inside a SE13 (Lewisham / Hither Green) conservation area loses permitted development, so the SE13 (Lewisham / Hither Green) submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Blackheath a house extension is judged on the street elevation first.
SE13 (Lewisham / Hither Green) permitted development status: there is no borough-wide direction from Lewisham Council, so a house extension at a SE13 address is normally still permitted development. We certify that with a £274 Lawful Development Certificate rather than leaving a SE13 (Lewisham / Hither Green) sale to argue it later.
What SE13 (Lewisham / Hither Green) is built from: 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. That mix decides the house extension route in SE13 (Lewisham / Hither Green) more than the postcode does, and it is what a Lewisham Council case officer reads first. A householder application costs £548 paid to Lewisham Council direct, with 8 weeks to a decision once validated.
Sources for this SE13 house extension 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.
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