Brent spans Wembley, Kilburn, Willesden, Harlesden, and Neasden. It is a large, diverse outer-west London borough with a mainly pragmatic approach to residential extensions. Conservation areas are concentrated in Kilburn, Queen's Park, and parts of Wembley, rather than being borough-wide. The council has adopted its Local Plan in 2022, which sets out current policies. Basement proposals require particular care given the noted policy expectations.
Common projects that may be straightforward when they fit within PD limits and local constraints.
These are the usual reasons planning permission becomes more likely in Brent.
The biggest drivers of approval are the exact proposal (dimensions and design) and the exact site constraints (designation, conditions, neighbour impacts). Use borough context as a starting point, then validate it with address-level checks and nearby precedents.
Projects that stay modest in size, match materials, and avoid obvious neighbour impacts are more likely to be straightforward — even before you consider borough-specific policies.
Conservation areas, listed buildings, Article 4 directions, flood risk and TPOs can flip the answer. Address-level checks stop you wasting money on the wrong scheme.
The fastest signal is what the council has approved or refused on comparable streets nearby. Precedent does not guarantee success, but it helps you shape a lower-risk design.
Basement proposals are highly site-specific. Always validate with an address-level check and professional advice.
Check my propertyCouncils rarely refuse the "idea" of an extension or loft conversion — refusals are usually about scale, design, neighbour impacts, and policy/designation conflicts. When you run a check, CanUBuild shows nearby approvals and refusals so you can see what has worked locally.
An invalid application cannot be registered. Use this checklist to ensure your submission is complete before you pay the fee.
Requirements can change — always verify the current validation checklist on the Brent Council website before submitting.
Search the address, choose your project type, and get an answer based on permitted development rules, local constraints, and nearby precedent decisions.
Brent is considered moderately strict by London standards — less restrictive than the inner-London heritage boroughs but still applying the same national PD rules and its own Local Plan policies. For standard extensions on properties outside conservation areas, the process is generally straightforward.
Brent's Local Plan and adopted policies expect basement proposals to clearly demonstrate impacts on neighbours and drainage. Multi-level basements are typically higher risk than single-level. There is no dedicated basement SPD, but the policies are applied actively.
Kilburn has conservation area designations (overlapping with Camden). If your property is within the CA, additional scrutiny applies. Check which borough is your planning authority — Kilburn sits on the boundary of Brent and Camden.
Wembley is a major development and regeneration opportunity area with active planning frameworks for commercial and large-scale residential development. This does not directly restrict domestic extensions on residential streets in the wider Wembley area.
Last reviewed: 2026-03 · This guide is for general information only. Always verify with Brent Council or a qualified planning consultant before making decisions.