Where in Blackheath (Greenwich) does a house extension actually get determined?
Every Blackheath (Greenwich) postcode district we draw in, the stock that dominates
it and the authority that validates a house extension there. Blackheath (Greenwich) fees below are the
statutory England rates for 2026, not house extension estimates.
| Postcode | Area | Dominant stock | What it means for a house extension |
|---|
| SE3 | Blackheath / Kidbrooke | Georgian villas, Victorian terraces | A house extension in Blackheath / Kidbrooke may land with Greenwich Council or Lewisham Council — SE3 crosses the boundary, and the SE3 policies map decides it street by street. |
| SE10 | Greenwich | Georgian terraces, listed buildings | Neighbouring Greenwich, where house extension work is handled by the same Greenwich Council case officers. |
| SE7 | Charlton | Victorian villas, 1930s semi-detached | Neighbouring Charlton, where house extension work is handled by the same Greenwich Council case officers. |
| SE18 | Woolwich | Georgian fragments, post-war estates, new-build | Neighbouring Woolwich, where house extension work is handled by the same Greenwich Council case officers. |
| SE9 | Eltham | 1930s semi-detached, post-war flats | Neighbouring Eltham, where house extension work is handled by the same Greenwich Council case officers. |
| SE28 | Thamesmead | Post-war estates, new-build | Neighbouring Thamesmead, where house extension work is handled by the same Greenwich Council case officers. |
| SE3 | Kidbrooke | New-build, post-war fragments | Neighbouring Kidbrooke, where house extension work is handled by the same Greenwich Council case officers. |
| SE9 | New Eltham | 1930s semi-detached | Neighbouring New Eltham, where house extension work is handled by the same Greenwich Council case officers. |
Which Blackheath (Greenwich) neighbourhoods suit a house extension best?
Roof pitch, wall build-up and plot depth change every few Blackheath (Greenwich)
streets, and each one changes what a house extension can achieve at that address.
- Blackheath (Greenwich) (SE3) — Georgian villas around the heath defines Blackheath (Greenwich), where georgian villas, victorian terraces set what a house extension can do. Georgian rear elevations here are usually the listed or locally listed face of the building across SE3. Any Blackheath (Greenwich) house extension is validated by Greenwich Council, with Blackheath Common the usual Blackheath (Greenwich) reference point on the site plan.
- Near Blackheath (Greenwich): Kidbrooke (SE3) — house extension work in Kidbrooke means new-build, post-war fragments. Kidbrooke is regenerated quarter, new-build estate. Post-war houses on these estates often sit under an estate management scheme throughout SE3. Greenwich Council decides the Kidbrooke application, and Kidbrooke Village anchors the Kidbrooke location plan.
- Near Blackheath (Greenwich): New Eltham (SE9) — a house extension in New Eltham starts from 1930s semi-detached, and New Eltham reads as 1930s semi-detached. 1930s semis here have the deepest rear gardens in the area in SE9. Greenwich Council assesses New Eltham house extensions against its own New Eltham character guidance, and the location plan we draw for New Eltham references New Eltham station.
- Near Blackheath (Greenwich): Greenwich (SE10) — Georgian World Heritage centre defines Greenwich, where georgian terraces, listed buildings set what a house extension can do. Georgian rear elevations here are usually the listed or locally listed face of the building across SE10. Any Greenwich house extension is validated by Greenwich Council, with Royal Observatory the usual Greenwich reference point on the site plan.
- Near Blackheath (Greenwich): Charlton (SE7) — a house extension in Charlton starts from victorian villas, 1930s semi-detached, and Charlton reads as Victorian villas, 1930s semi-detached. The side-return infill is the classic move on these Victorian terraces — 3 m of permitted development depth plus the width of the original side passage in SE7. Greenwich Council assesses Charlton house extensions against its own Charlton character guidance, and the location plan we draw for Charlton references Charlton House.
- Near Blackheath (Greenwich): Woolwich (SE18) — house extension work in Woolwich means georgian fragments, post-war estates, new-build. Woolwich is Georgian arsenal heritage, riverside regen. Georgian rear elevations here are usually the listed or locally listed face of the building throughout SE18. Greenwich Council decides the Woolwich application, and Royal Arsenal anchors the Woolwich location plan.
- Near Blackheath (Greenwich): Eltham (SE9) — 1930s semi-detached, Tudor fragments defines Eltham, where 1930s semi-detached, post-war flats set what a house extension can do. 1930s semis here have the deepest rear gardens in the area across SE9. Any Eltham house extension is validated by Greenwich Council, with Eltham Palace the usual Eltham reference point on the site plan.
What local planning policy applies to a house extension in Blackheath (Greenwich)?
Blackheath (Greenwich) conservation designations: there are 20 across Greenwich Council, Greenwich Town Centre (World Heritage Site), Blackheath, Charlton among them. Designation costs a Blackheath (Greenwich) owner the permitted-development route: a house extension then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Eltham Park is the Blackheath (Greenwich) designation that most often changes a house extension design.
Article 4 and your Blackheath (Greenwich) house extension: Greenwich Council has made no borough-wide direction, so permitted development for a house extension in Blackheath (Greenwich) generally survives outside Blackheath (Greenwich) conservation areas and listed curtilages. A Lawful Development Certificate at £274 is how a SE3 owner records that a house extension was lawful.
The building fabric around Blackheath (Greenwich): Georgian in Greenwich town centre; Victorian terraces in East Greenwich, Charlton; inter-war semi-detached in Eltham; new-build along the riverside. World Heritage Site status in Greenwich town centre adds heritage weight; outer borough areas (Eltham, Thamesmead) generally permissive. A house extension in Blackheath (Greenwich) is scoped against that stock first, because it decides whether the scheme runs as permitted development, a £274 Lawful Development Certificate, or a full £548 application to Greenwich Council.
Who decides a house extension on the edge of Blackheath (Greenwich)?
- Bexley — cross the Blackheath (Greenwich) boundary and Bexley Council takes the house extension instead, applying 16 conservation areas of its own around DA1. We re-price house extensions at the Blackheath (Greenwich) edge because Bexley policy and Greenwich policy rarely align on house extension depth.
- Bromley — cross the Blackheath (Greenwich) boundary and Bromley Council takes the house extension instead, applying 48 conservation areas of its own around BR1. We re-price house extensions at the Blackheath (Greenwich) edge because Bromley policy and Greenwich policy rarely align on house extension depth.
- Newham — the Newham boundary runs against Greenwich, so a house extension a street from Blackheath (Greenwich) is decided by Newham Council instead. Newham runs 10 conservation areas across E6 and its neighbours, which is why house extensions priced for Blackheath (Greenwich) are re-checked against Newham policy whenever the Blackheath (Greenwich) address sits on that edge.
- Tower Hamlets — cross the Blackheath (Greenwich) boundary and Tower Hamlets Council takes the house extension instead, applying 58 conservation areas of its own around E1. We re-price house extensions at the Blackheath (Greenwich) edge because Tower Hamlets policy and Greenwich policy rarely align on house extension depth.
Sources for this Blackheath (Greenwich) 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.
