House Extension Drawings in Brent

Where in Brent does a house extension actually get determined?

Every Brent postcode district we draw in, the stock that dominates it and the authority that validates a house extension there. Brent fees below are the statutory England rates for 2026, not house extension estimates.

How does a house extension differ street by street across Brent?

Roof pitch, wall build-up and plot depth change every few Brent streets, and each one changes what a house extension can achieve at that address.

• Queen's Park (NW6) — a house extension in Queen's Park starts from edwardian villas, and Queen's Park reads as Edwardian villas, conservation. Edwardian plots here are wider in NW6. Brent Council assesses Queen's Park house extensions against its own Queen's Park character guidance, and the location plan we draw for Queen's Park references Queen's Park.
• Harlesden (NW10) — Victorian terraces defines Harlesden, where victorian terraces set what a house extension 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 extension is validated by Brent Council, with Harlesden High Street the usual Harlesden reference point on the site plan.
• Mapesbury (NW2) — a house extension in Mapesbury starts from edwardian villas and terraces, and Mapesbury reads as Edwardian conservation area. Edwardian plots here are wider in NW2. Brent Council assesses Mapesbury house extensions against its own Mapesbury character guidance, and the location plan we draw for Mapesbury references Mapesbury Conservation Area.
• Kensal Green (NW10) — Victorian terraces defines Kensal Green, where victorian terraces set what a house extension 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 Kensal Green house extension is validated by Brent Council, with Kensal Green Cemetery the usual Kensal Green reference point on the site plan.
• Willesden (NW10) — Victorian terraces, Edwardian defines Willesden, where victorian terraces, edwardian terraces set what a house extension 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 extension is validated by Brent Council, with Willesden Green Tube the usual Willesden reference point on the site plan.
• Neasden (NW10, NW2) — a house extension in Neasden starts from 1930s semi-detached, post-war, and Neasden reads as 1930s semi-detached. 1930s semis here have the deepest rear gardens in the area in NW10. Brent Council assesses Neasden house extensions against its own Neasden character guidance, and the location plan we draw for Neasden references BAPS Shri Swaminarayan Mandir.
• Cricklewood (NW2) — house extension work in Cricklewood means edwardian terraces. Cricklewood is Edwardian terraces. Edwardian plots here are wider throughout NW2. Brent Council decides the Cricklewood application, and Cricklewood Broadway anchors the Cricklewood location plan.

How do conservation areas and Article 4 affect a house extension in Brent?

How designation changes a Brent house extension: Brent Council maintains 22 conservation areas, including Mapesbury, Kensal Green, Harlesden. Inside any of them a Brent house extension cannot rely on permitted development, and the route becomes a £548 householder application determined in 8 weeks rather than a £249 prior approval in 6 weeks. Harlesden sets the tone for Brent casework.

Brent and Article 4: Article 4 for HMO conversions in specific streets around Wembley and Harlesden. A house extension planned at a NW2 address is checked against that direction first; Brent Council publishes the Brent extent, and the NW2 line rarely follows the Brent boundary you would expect.

The building fabric around Brent: 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 extension in Brent 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 Brent Council.

Who decides a house extension on the edge of Brent?

• Camden — cross the Brent boundary and Camden Council takes the house extension instead, applying 40 conservation areas of its own around NW1. We re-price house extensions at the Brent edge because Camden policy and Brent policy rarely align on house extension depth.
• Westminster — cross the Brent 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 Brent edge because Westminster policy and Brent policy rarely align on house extension depth.
• Kensington and Chelsea — cross the Brent boundary and RBKC Planning takes the house extension instead, applying 38 conservation areas of its own around SW1. We re-price house extensions at the Brent edge because Kensington and Chelsea policy and Brent policy rarely align on house extension depth.
• Hammersmith and Fulham — cross the Brent boundary and Hammersmith & Fulham Council takes the house extension instead, applying 45 conservation areas of its own around W6. We re-price house extensions at the Brent edge because Hammersmith and Fulham policy and Brent policy rarely align on house extension depth.

Sources for this Brent 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.