Where in Herne Hill does a house extension actually get determined?
Every Herne Hill postcode district we draw in, the stock that dominates
it and the authority that validates a house extension there. Herne Hill fees below are the
statutory England rates for 2026, not house extension estimates.
| Postcode | Area | Dominant stock | What it means for a house extension |
|---|
| SE24 | Herne Hill | Victorian villas, Edwardian terraces | A house extension in Herne Hill may land with Lambeth Council or Southwark Council — SE24 crosses the boundary, and the SE24 policies map decides it street by street. |
| SW4 | Clapham | Victorian terraces, Edwardian villas | Neighbouring Clapham, where house extension work is handled by the same Lambeth Council case officers. |
| SW2 | Brixton | Victorian terraces, post-war estates | Neighbouring Brixton, where house extension work is handled by the same Lambeth Council case officers. |
| SE11 | Kennington | Georgian terraces, post-war estates | Neighbouring Kennington, where house extension work is handled by the same Lambeth Council case officers. |
| SW16 | Streatham | Edwardian terraces, post-war flats | Neighbouring Streatham, where house extension work is handled by the same Lambeth Council case officers. |
| SW9 | Stockwell | Victorian terraces, post-war estates | Neighbouring Stockwell, where house extension work is handled by the same Lambeth Council case officers. |
| SE11 | Vauxhall | Regency terraces, modern apartments, post-war flats | Neighbouring Vauxhall, where house extension work is handled by the same Lambeth Council case officers. |
| SE27 | West Norwood | Victorian terraces, Edwardian villas | Neighbouring West Norwood, where house extension work is handled by the same Lambeth Council case officers. |
| SE27 | Tulse Hill | Victorian villas, Edwardian terraces | Neighbouring Tulse Hill, where house extension work is handled by the same Lambeth Council case officers. |
| SE1 | Waterloo | Georgian terraces, post-war flats, new-build | Neighbouring Waterloo, where house extension work is handled by the same Lambeth Council case officers. |
Which Herne Hill neighbourhoods suit a house extension best?
Roof pitch, wall build-up and plot depth change every few Herne Hill
streets, and each one changes what a house extension can achieve at that address.
- Herne Hill (SE24) — Victorian villas around Brockwell Park defines Herne Hill, where victorian villas, edwardian terraces set what a house extension can do. The side-return infill is the classic move on these Victorian terraces — 3 across SE24. Any Herne Hill house extension is validated by Lambeth Council, with Brockwell Park the usual Herne Hill reference point on the site plan.
- Near Herne Hill: Waterloo (SE1) — a house extension in Waterloo starts from georgian terraces, post-war flats, new-build, and Waterloo reads as Georgian fragments, post-war estates, regen. Georgian rear elevations here are usually the listed or locally listed face of in SE1. Lambeth Council assesses Waterloo house extensions against its own Waterloo character guidance, and the location plan we draw for Waterloo references Southbank Centre.
- Near Herne Hill: Clapham (SW4) — house extension work in Clapham means victorian terraces, edwardian villas. Clapham is Victorian terraces around the common. The side-return infill is the classic move on these Victorian terraces — 3 throughout SW4. Lambeth Council decides the Clapham application, and Clapham Common anchors the Clapham location plan.
- Near Herne Hill: Brixton (SW2, SW9) — house extension work in Brixton means victorian terraces, post-war estates. Brixton is Victorian terraces, vibrant centre. The side-return infill is the classic move on these Victorian terraces — 3 throughout SW2. Lambeth Council decides the Brixton application, and Brixton Market anchors the Brixton location plan.
- Near Herne Hill: Kennington (SE11) — house extension work in Kennington means georgian terraces, post-war estates. Kennington is Georgian terraces, Regency squares. Georgian rear elevations here are usually the listed or locally listed face of throughout SE11. Lambeth Council decides the Kennington application, and Kennington Park anchors the Kennington location plan.
- Near Herne Hill: Streatham (SW16) — a house extension in Streatham starts from edwardian terraces, post-war flats, and Streatham reads as Edwardian terraces, post-war flats. Edwardian plots here are wider in SW16. Lambeth Council assesses Streatham house extensions against its own Streatham character guidance, and the location plan we draw for Streatham references Streatham High Road.
- Near Herne Hill: Stockwell (SW9) — Victorian terraces, post-war estates defines Stockwell, where victorian terraces, post-war estates set what a house extension can do. The side-return infill is the classic move on these Victorian terraces — 3 across SW9. Any Stockwell house extension is validated by Lambeth Council, with Stockwell station the usual Stockwell reference point on the site plan.
Does Herne Hill planning policy restrict a house extension?
Herne Hill conservation designations: there are 64 across Lambeth Council, Herne Hill, Brixton Road, Kennington among them. Designation costs a Herne Hill owner the permitted-development route: a house extension then needs a £258 householder application over 8 weeks, in place of the £120 prior approval route that takes 6 weeks. Kennington is the Herne Hill designation that most often changes a house extension design.
Herne Hill and Article 4: Borough-wide Article 4 for HMO conversions; plus office-to-residential restrictions. A house extension planned at a SE24 address is checked against that direction first; Lambeth Council publishes the Herne Hill extent, and the SE24 line rarely follows the Herne Hill boundary you would expect.
Herne Hill housing stock: 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. Read that before choosing a house extension route in Herne Hill — construction, not postcode, sets what is achievable. House extensions in Herne Hill start at £1,225 on a fixed fee, or £1,750 for the Complete package covering both Lambeth Council submissions.
What happens if a Herne Hill property sits on a boundary?
- Wandsworth — cross the Herne Hill boundary and Wandsworth Council takes the house extension instead, applying 45 conservation areas of its own around SW8. We re-price house extensions at the Herne Hill edge because Wandsworth policy and Lambeth policy rarely align on house extension depth.
- Croydon — the Croydon boundary runs against Lambeth, so a house extension a street from Herne Hill is decided by Croydon Council instead. Croydon runs 24 conservation areas across CR0 and its neighbours, which is why house extensions priced for Herne Hill are re-checked against Croydon policy whenever the Herne Hill address sits on that edge.
- Merton — adjoining Herne Hill, with 28 conservation areas centred on SW16. A house extension on the far side of the Herne Hill line is determined by Merton Council, so the Herne Hill quote for house extensions is checked against Merton guidance before it is issued.
- Westminster — cross the Herne Hill boundary and Westminster City Council takes the house extension instead, applying 56 conservation areas of its own around SW1. We re-price house extensions at the Herne Hill edge because Westminster policy and Lambeth policy rarely align on house extension depth.
Sources for this Herne Hill 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.
