Which postcode districts around Harlesden do we cover for house extensions work?
Every Harlesden postcode district we draw in, the stock that dominates
it and the authority that validates a house extensions there. Harlesden fees below are the
statutory England rates for 2026, not house extensions estimates.
| Postcode | Area | Dominant stock | What it means for a house extensions |
|---|
| NW10 | Willesden / Harlesden / Kensal Green | Victorian terraces | Willesden / Harlesden / Kensal Green is split at NW10. Either Brent Council or Ealing Council can determine a house extensions here, so the NW10 address is checked against both policies maps first. |
| HA0 | Wembley | 1930s semi-detached, new-build | Neighbouring Wembley, where house extensions work is handled by the same Brent Council case officers. |
| NW6 | Kilburn | Victorian terraces, mansion blocks | Neighbouring Kilburn, where house extensions work is handled by the same Brent Council case officers. |
| NW6 | Queen's Park | Edwardian villas | Neighbouring Queen's Park, where house extensions work is handled by the same Brent Council case officers. |
| NW2 | Mapesbury | Edwardian villas and terraces | Neighbouring Mapesbury, where house extensions work is handled by the same Brent Council case officers. |
| NW10 | Kensal Green | Victorian terraces | Neighbouring Kensal Green, where house extensions work is handled by the same Brent Council case officers. |
| NW10 | Willesden | Victorian terraces, Edwardian terraces | Neighbouring Willesden, where house extensions work is handled by the same Brent Council case officers. |
| NW10 | Neasden | 1930s semi-detached, post-war | Neighbouring Neasden, where house extensions work is handled by the same Brent Council case officers. |
| NW2 | Cricklewood | Edwardian terraces | Neighbouring Cricklewood, where house extensions work is handled by the same Brent Council case officers. |
| HA0 | Sudbury | 1930s semi-detached | Neighbouring Sudbury, where house extensions work is handled by the same Brent Council case officers. |
Which Harlesden neighbourhoods suit a house extensions best?
Roof pitch, wall build-up and plot depth change every few Harlesden
streets, and each one changes what a house extensions can achieve at that address.
- Harlesden (NW10) — Victorian terraces defines Harlesden, where victorian terraces set what a house extensions can do. 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 across NW10. Any Harlesden house extensions is validated by Brent Council, with Harlesden High Street the usual Harlesden reference point on the site plan.
- Near Harlesden: Kensal Green (NW10) — house extensions work in Kensal Green means victorian terraces. Kensal Green is Victorian terraces. 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 throughout NW10. Brent Council decides the Kensal Green application, and Kensal Green Cemetery anchors the Kensal Green location plan.
- Near Harlesden: Willesden (NW10) — Victorian terraces, Edwardian defines Willesden, where victorian terraces, edwardian terraces set what a house extensions can do. 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 across NW10. Any Willesden house extensions is validated by Brent Council, with Willesden Green Tube the usual Willesden reference point on the site plan.
- Near Harlesden: Neasden (NW10, NW2) — house extensions work in Neasden means 1930s semi-detached, post-war. Neasden is 1930s semi-detached. 1930s semis here have the deepest rear gardens in the area throughout NW10. Brent Council decides the Neasden application, and BAPS Shri Swaminarayan Mandir anchors the Neasden location plan.
- Near Harlesden: Cricklewood (NW2) — a house extensions in Cricklewood starts from edwardian terraces, and Cricklewood reads as Edwardian terraces. Edwardian plots here are wider in NW2. Brent Council assesses Cricklewood house extensions against its own Cricklewood character guidance, and the location plan we draw for Cricklewood references Cricklewood Broadway.
- Near Harlesden: Sudbury (HA0) — a house extensions in Sudbury starts from 1930s semi-detached, and Sudbury reads as 1930s semi-detached. 1930s semis here have the deepest rear gardens in the area in HA0. Brent Council assesses Sudbury house extensions against its own Sudbury character guidance, and the location plan we draw for Sudbury references Sudbury Town Tube.
- Near Harlesden: Wembley (HA0, HA9) — 1930s semi-detached, major regen defines Wembley, where 1930s semi-detached, new-build set what a house extensions can do. 1930s semis here have the deepest rear gardens in the area across HA0. Any Wembley house extensions is validated by Brent Council, with Wembley Stadium the usual Wembley reference point on the site plan.
How do conservation areas and Article 4 affect a house extensions in Harlesden?
Conservation areas covering Harlesden: Brent Council runs 22, and Queen's Park, Mapesbury, Kensal Green are the ones Harlesden owners meet most. A house extensions inside a Harlesden conservation area loses permitted development, so the Harlesden submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Harlesden a house extensions is judged on the street elevation first.
Harlesden and Article 4: Article 4 for HMO conversions in specific streets around Wembley and Harlesden. A house extensions planned at a NW10 address is checked against that direction first; Brent Council publishes the Harlesden extent, and the NW10 line rarely follows the Harlesden boundary you would expect.
The building fabric around Harlesden: Edwardian villas in Queen's Park and Mapesbury; Victorian terraces in Kilburn and Harlesden; 1930s semi-detached in Wembley; post-war tower blocks in Church End. Highly diverse borough; Queen's Park and Mapesbury are heritage-controlled; Wembley is a major regeneration hub. A house extensions in Harlesden is scoped against that stock first.
Who decides a house extensions on the edge of Harlesden?
- Westminster — cross the Harlesden boundary and Westminster City Council takes the house extensions instead, applying 56 conservation areas of its own around SW1. We re-price house extensions at the Harlesden edge because Westminster policy and Brent policy rarely align on house extensions depth.
- Kensington and Chelsea — the Kensington and Chelsea boundary runs against Brent, so a house extensions a street from Harlesden is decided by RBKC Planning instead. Kensington and Chelsea runs 38 conservation areas across SW1 and its neighbours, which is why house extensions priced for Harlesden are re-checked against Kensington and Chelsea policy whenever the Harlesden address sits on that edge.
- Hammersmith and Fulham — the Hammersmith and Fulham boundary runs against Brent, so a house extensions a street from Harlesden is decided by Hammersmith & Fulham Council instead. Hammersmith and Fulham runs 45 conservation areas across W6 and its neighbours, which is why house extensions priced for Harlesden are re-checked against Hammersmith and Fulham policy whenever the Harlesden address sits on that edge.
- Ealing — cross the Harlesden boundary and Ealing Council takes the house extensions instead, applying 30 conservation areas of its own around W3. We re-price house extensions at the Harlesden edge because Ealing policy and Brent policy rarely align on house extensions depth.
Sources for this Harlesden house extensions 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.
