Basement Conversions · SE24 Herne Hill
SE24 spans Lambeth and Southwark; conservation areas around Herne Hill and the Sunray Estate control much of the housing.
The borough-level guide to basement conversions in Lambeth sets out how the same work is handled across the rest of the authority.
Basement conversions and lowering existing cellars in Herne Hill add space without touching the roofline — valuable on SE24's period houses around Herne Hill, Brockwell Park, Poets' Corner, North Dulwich fringe. Lambeth 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 Herne Hill — structural underpinning design, waterproofing strategy, Party Wall coordination, planning where required, and building regulations through to completion certificate.
Across Herne Hill, Brockwell Park, Poets' Corner, North Dulwich fringe in SE24, the dominant property is large victorian and edwardian terraces and bay-fronted houses around herne hill, with mansion blocks and villas toward brockwell park. 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 Lambeth Council judges each on design quality and neighbour impact. We survey the specific Herne Hill property, confirm the planning route — Permitted Development, a Lawful Development Certificate, or full planning — and draw a council-ready set tailored to the SE24 streetscape.
Housing stock in SE24: Large Victorian and Edwardian terraces and bay-fronted houses around Herne Hill, with mansion blocks and villas toward Brockwell Park.
Within the district: Herne Hill, Brockwell Park, Poets' Corner, North Dulwich fringe.
Streets we know in SE24: the Poets' Corner streets (Shakespeare Road, Milton Road), Half Moon Lane and the Casino Estate roads. Each road has its own building line, boundary treatment and precedent that Lambeth Council weighs when assessing a basement conversion drawings scheme.
Conservation areas: Herne Hill, Casino Avenue, Sunray Estate. Inside these, most external work needs full planning and a Heritage Statement.
Getting around SE24: Herne Hill rail to Victoria, Blackfriars and London Bridge (Thameslink).
Property values: around £500,000 for a flat and £1m-£1.6m for a house — a useful gauge of the build value an extension or loft adds in SE24.
Borough character: Mix of dense Victorian residential and post-war estate; strong conservation area coverage; generally design-led planning decisions.
Desktop study plus measured survey assessing existing foundations, ground conditions, water table level and underpinning viability for your Herne Hill 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 Herne Hill's ground conditions and water table.
Full Plans application to Lambeth 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 Herne Hill 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 large Victorian and Edwardian terraces around Poets' Corner and Half Moon Lane suit side-return, rear and loft extensions, much of it within Permitted Development outside the conservation areas, confirmed with a Lawful Development Certificate. We confirm the route and draw to Lambeth's or Southwark's checklist.
SE24 straddles the boundary — Herne Hill and Brockwell Park largely sit in Lambeth, with the eastern edge toward North Dulwich in Southwark. The two councils apply different conservation controls, so we confirm your exact authority before quoting and submit accordingly.
The Sunray Estate is a designated conservation area of early-20th-century cottage-style housing with strong character controls, so extensions there are assessed tightly on form and materials. We design sympathetically and submit a full application with a Heritage Statement where required.
With SE24 houses around £1m-£1.6m and excellent Thameslink links from Herne Hill, a well-designed side-return or loft adds floor area worth well above the build and drawing cost. Our fixed drawing fee keeps the professional cost predictable on these large period houses.
With Herne Hill property at around £500,000 for a flat and £1m-£1.6m for a house, the professional drawing fee is a small fraction of the value the work adds to SE24's large victorian and edwardian terraces and bay-fronted. Lambeth Council charges its own statutory application fee on top (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 SE24 address.
For a SE24 project across Herne Hill, Brockwell Park, Poets' Corner, North Dulwich 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 Lambeth Council (8 weeks for a householder application). We carry the Herne Hill application through every officer query to the decision.
Herne Hill (SE24) sits primarily in Lambeth, so applications are decided by Lambeth Council. Conservation areas within SE24 include Herne Hill, Casino Avenue, Sunray Estate, 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 Herne Hill — 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 Lambeth Council Building Control or an approved inspector. On SE24'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. With Herne Hill (SE24) property at around £500, 000 for a flat and £1m-£1.6m for a house, a well-designed extension or loft typically returns more than it costs in added floor area and sale value. 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 SE24 homes.
Working across a borough boundary, or unsure which council will decide your application? Every service we offer is listed for SE5, SE19, SE21, SE27, SW2, SW4, SW9 and SW12.
Pick a slot that suits you. No obligation and no sales pressure, just straight answers on your planning route.
Every SE24 postcode district we draw in, the stock that dominates it and the authority that validates a basement conversion there. SE24 fees below are the statutory England rates for 2026, not basement conversion estimates.
| Postcode | Area | Dominant stock | What it means for a basement conversion |
|---|---|---|---|
| SE24 | Herne Hill | Victorian villas, Edwardian terraces | SE24 straddles a boundary: Herne Hill addresses fall to Lambeth Council or Southwark Council, so confirm which authority validates the basement conversion before submitting SE24 drawings. |
| SE11 | Kennington / Vauxhall | Georgian terraces, post-war estates | Adjoining district to SE24, also inside Lambeth for basement conversion purposes. |
| SE27 | West Norwood / Tulse Hill | Victorian terraces, Edwardian villas | Adjoining district to SE24, also inside Lambeth for basement conversion purposes. |
| SW2 | Brixton Hill / Tulse Hill | Victorian terraces, post-war estates | Adjoining district to SE24, also inside Lambeth for basement conversion purposes. |
| SE1 | Bermondsey / Borough / Waterloo | Georgian terraces, post-war flats, new-build | Adjoining district to SE24, also inside Southwark for basement conversion purposes. |
| SE5 | Camberwell | Georgian villas, Victorian terraces | Adjoining district to SE24, also inside Southwark for basement conversion purposes. |
| SE15 | Peckham / Nunhead | Victorian terraces, post-war estates | Adjoining district to SE24, also inside Southwark for basement conversion purposes. |
| SE16 | Bermondsey / Rotherhithe | Warehouse conversions, Georgian terraces, new-build | Adjoining district to SE24, also inside Southwark for basement conversion purposes. |
Roof pitch, wall build-up and plot depth change every few SE24 streets, and each one changes what a basement conversion can achieve at that address.
SE24 (Herne Hill) conservation designations: there are 64 across Lambeth Council, Brockwell Park, Streatham Hill, Clapham Common among them. Designation costs a SE24 (Herne Hill) owner the permitted-development route: a basement conversion then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Streatham Hill is the SE24 (Herne Hill) designation that most often changes a basement conversion design.
SE24 (Herne Hill) and Article 4: Borough-wide Article 4 for HMO conversions; plus office-to-residential restrictions. A basement conversion planned at a SE24 address is checked against that direction first; Lambeth Council publishes the SE24 (Herne Hill) extent, and the SE24 line rarely follows the SE24 (Herne Hill) boundary you would expect.
What SE24 (Herne Hill) is built from: Victorian terraces in Clapham, Brixton, Herne Hill; Edwardian villas; 1930s and post-war estates in parts of Streatham; Georgian in Kennington. Mix of dense Victorian residential and post-war estate; strong conservation area coverage; generally design-led planning decisions. That mix decides the basement conversion route in SE24 (Herne Hill) more than the postcode does, and it is what a Lambeth Council case officer reads first. A householder application costs £548 paid to Lambeth Council direct, with 8 weeks to a decision once validated.
SE24 (Herne Hill) conservation designations: there are 43 across Southwark Council, Peckham Rye, Borough, Camberwell Grove among them. Designation costs a SE24 (Herne Hill) owner the permitted-development route: a basement conversion then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Dulwich Village is the SE24 (Herne Hill) designation that most often changes a basement conversion design.
SE24 (Herne Hill) and Article 4: Article 4 for HMOs borough-wide; additional Article 4 for office-to-residential in Bermondsey and Elephant & Castle. A basement conversion planned at a SE24 address is checked against that direction first; Southwark Council publishes the SE24 (Herne Hill) extent, and the SE24 line rarely follows the SE24 (Herne Hill) boundary you would expect.
What SE24 (Herne Hill) is built from: Georgian and Regency in Bermondsey and Borough; Victorian terraces in Camberwell and Peckham; Dulwich Estate controlled housing; riverside new-build. Dulwich Estate private planning scheme affects much of SE21 and SE22; Southwark planning for rest of borough; strong heritage context. That mix decides the basement conversion route in SE24 (Herne Hill) more than the postcode does, and it is what a Southwark Council case officer reads first. A householder application costs £548 paid to Southwark Council direct, with 8 weeks to a decision once validated.
Sources for this SE24 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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