Basement Conversions · SE6 Catford
Lewisham controls the Culverley Green (Corbett Estate) and Bellingham conservation areas; Catford town centre is undergoing major regeneration.
This page covers one part of the borough. For the full picture — fees, timelines and the council's current position — read basement conversions in Lewisham.
Basement conversions and lowering existing cellars in Catford add space without touching the roofline — valuable on SE6's period houses around Catford, Bellingham, Hither Green fringe, Corbett Estate. Lewisham Council reviews structural, drainage and flood-risk impact, and a Party Wall award plus a Thames Water build-over agreement are usually required. We coordinate the structural engineer and the waterproofing design.
Full architectural technology service for basement digs and cellar conversions in Catford — structural underpinning design, waterproofing strategy, Party Wall coordination, planning where required, and building regulations through to completion certificate.
Across Catford, Bellingham, Hither Green fringe, Corbett Estate in SE6, the dominant property is edwardian and inter-war bay-fronted terraces and semis around catford and bellingham, with the corbett estate streets and post-war housing. That stock shapes what basement conversion 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 Catford property, confirm the planning route — Permitted Development, a Lawful Development Certificate, or full planning — and draw a council-ready set tailored to the SE6 streetscape.
Housing stock in SE6: Edwardian and inter-war bay-fronted terraces and semis around Catford and Bellingham, with the Corbett Estate streets and post-war housing.
Within the district: Catford, Bellingham, Hither Green fringe, Corbett Estate.
Streets we know in SE6: the Corbett Estate roads (Torridon Road, Engleheart Road), Sangley Road and the Culverley Green streets. Each road has its own building line, boundary treatment and precedent that Lewisham Council weighs when assessing a basement conversion drawings scheme.
Conservation areas: Culverley Green (Corbett Estate), Bellingham Garden Suburb. Inside these, most external work needs full planning and a Heritage Statement.
Getting around SE6: Catford and Catford Bridge rail to London Bridge, Charing Cross and Victoria.
Regeneration: Catford falls within or beside the Catford town centre regeneration (Lewisham's major scheme), which shapes local planning policy and design expectations.
Property values: 504 SE6 sales completed in 2025 at a median of £475,000, a 6.7% increase on the year. The quartiles were £350,000 and £646,000, so this local market spans a wide range.
Borough character: Generally permissive planning compared to central boroughs; loft conversions and side-return extensions routinely approved under PD.
Desktop study plus measured survey assessing existing foundations, ground conditions, water table level and underpinning viability for your Catford property.
New-build basements and lightwell extensions need planning permission. Cellar conversions of existing space are usually Permitted Development. We confirm the route and submit where needed.
Underpinning sequence drawings, reinforced concrete design, temporary works strategy — all to Eurocode with chartered engineer sign-off.
BS 8102:2022 compliant — cavity drain, cementitious tanking or membrane system specified for Catford's ground conditions and water table.
Full Plans application to Lewisham Council Building Control or an approved inspector covering structure (Part A), fire safety (Part B), damp-proofing (Part C), ventilation (Part F) and thermal performance (Part L).
Almost every Catford basement triggers Party Wall notices. We also manage Thames Water Build Over Agreements 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 around Torridon Road and Engleheart Road suit side-return and rear extensions and loft conversions, but the Culverley Green conservation area covers much of the estate, so changes there need full planning. We design to match the estate's detailing and submit to Lewisham.
Catford's centre is being substantially redeveloped with new homes, a relocated South Circular and improved public realm, supporting values across SE6. For a house project the binding controls remain Permitted Development limits and the local conservation area, which we check for your address.
Outside the conservation areas, usually yes — a rear dormer or hip-to-gable within the volume allowance, confirmed by a Lawful Development Certificate. Inside Culverley Green or Bellingham, roof changes need full planning. We confirm which applies to your road and draw it for Building Control.
The town-centre regeneration is improving the area.
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 SE6 address.
For a SE6 project across Catford, Bellingham, Hither Green fringe, Corbett Estate, 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 Catford application through every officer query to the decision.
Catford (SE6) sits primarily in Lewisham, so applications are decided by Lewisham Council. Conservation areas within SE6 include Culverley Green (Corbett Estate), Bellingham Garden Suburb, 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 basement conversion drawings in Catford — 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 SE6'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 SE6 homes.
Working across a borough boundary, or unsure which council will decide your application? Every service we offer is listed for SE3, SE4, SE12, SE13, SE23 and SE26.
Pick a slot that suits you. No obligation and no sales pressure, just straight answers on your planning route.
Every SE6 postcode district we draw in, the stock that dominates it and the authority that validates a basement conversion there. SE6 fees below are the statutory England rates for 2026, not basement conversion estimates.
| Postcode | Area | Dominant stock | What it means for a basement conversion |
|---|---|---|---|
| SE6 | Catford / Bellingham | 1930s semi-detached, post-war flats | A basement conversion at an SE6 address in Catford / Bellingham is determined by Lewisham Council under its own Local Plan policies for Catford / Bellingham. |
| SE6 | Catford | 1930s semi-detached, post-war flats | Catford sits inside SE6; basement conversion proposals here are determined by Lewisham Council. |
| SE4 | Brockley | Victorian and Edwardian terraces | Adjoining district to SE6, also inside Lewisham for basement conversion purposes. |
| SE8 | Deptford | Georgian terraces, post-war estates, new-build | Adjoining district to SE6, also inside Lewisham for basement conversion purposes. |
| SE12 | Lee / Grove Park | mixed stock | Adjoining district to SE6, also inside Lewisham for basement conversion purposes. |
Roof pitch, wall build-up and plot depth change every few SE6 streets, and each one changes what a basement conversion can achieve at that address.
Conservation areas covering SE6 (Catford / Bellingham): Lewisham Council runs 30, and Lee Green, Blackheath, Deptford High Street are the ones SE6 (Catford / Bellingham) owners meet most. A basement conversion inside a SE6 (Catford / Bellingham) conservation area loses permitted development, so the SE6 (Catford / Bellingham) submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Hither Green a basement conversion is judged on the street elevation first.
No blanket Article 4 over SE6 (Catford / Bellingham): Lewisham Council has not withdrawn permitted development across SE6 (Catford / Bellingham), so a basement conversion outside a SE6 (Catford / Bellingham) conservation area usually keeps it. The £274 Lawful Development Certificate is still the document a SE6 owner wants on file.
SE6 (Catford / Bellingham) housing stock: 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. Read that before choosing a basement conversion route in SE6 (Catford / Bellingham) — construction, not postcode, sets what is achievable. Lewisham Council charges £548 for a householder application and has 8 weeks to determine it.
Sources for this SE6 basement conversion 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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