The fast route to a deep single-storey rear extension in Brent — up to 6 metres on an attached house or 8 on a detached one — via Brent Council's prior approval scheme rather than a full planning application.
Brent Council granted 85.5% of the householder planning decisions it made in its latest published year — 4.799999999999997 points below the 90.3% England-wide householder average. Flat conversions and HMOs draw heightened scrutiny on amenity, refuse storage and cycle parking given the borough's Article 4 stance, which is where a policy-literate drawing pack earns its keep. Its dominant Victorian (1837–1901), Edwardian (1901–1910), interwar (1918–1939) and postwar (1945–1970) housing stock sets the design brief on most streets.
Before permission is required, Class B allows 40m³ of added loft volume on a terrace and 50m³ on a semi or detached house, and Class A allows a 3m single-storey rear extension on a terrace or 4m on a detached house. Brent carries at least one Article 4 direction, and conservation areas including Queen's Park, Mapesbury and Sudbury Court remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Brent is determined against an 8-week statutory target.
Kilburn (dense Victorian terraces, much of it converted to flats), Willesden (Victorian and Edwardian terraces around Willesden Green), Wembley (interwar semis and postwar housing near the stadium), Harlesden (tightly packed Victorian terraced streets), Kingsbury (classic 1930s Metro-land semi-detached estates) and Queen's Park (red-brick terraces framing the Queen's Park conservation area) — these are the Brent pockets our drawings cover most. Heritage designations here include Queen's Park, Mapesbury, Sudbury Court, Roundwood and Brondesbury. Brent Council weighs each proposal against Brent Local Plan and the Design Guide for New Development SPD, where the loss of family-sized housing is resisted, so schemes that carve up larger homes must justify the mix. Converted flats are very common through Kilburn, Willesden and Cricklewood, and none of them hold householder permitted-development rights.. On roofs the borough is London butterfly roofs on the inner terraces and hipped roofs on the Metro-land semis, over Victorian and Edwardian terraces across Kilburn and Willesden, interwar semi-detached houses around Wembley and Kingsbury and converted period flats and maisonettes.
The ordinary Class A limits stop a single-storey rear extension at 3 metres on an attached house and 4 on a detached one. The larger home extension scheme doubles both, on condition that the council is told first. That notification is not an application for permission — the council cannot refuse on design, materials or policy grounds. It can only consider the effect on the amenity of adjoining premises, and only if a neighbour actually objects during the 21-day consultation.
The other conditions still apply and are strict: single storey only, no higher than 4 metres, eaves no higher than the existing eaves, and no more than half the land around the original house covered. It is not available on designated land, so a house in a conservation area such as Queen's Park and Mapesbury cannot use it at all. Materials must be similar to the existing house, and the extension must not include a veranda, balcony or raised platform.
Brent is largely Victorian and Edwardian terraces across Kilburn and Willesden, interwar semi-detached houses around Wembley and Kingsbury and converted period flats and maisonettes. Flat conversions and HMOs draw heightened scrutiny on amenity, refuse storage and cycle parking given the borough's Article 4 stance, which matters here because an objecting neighbour puts amenity squarely in front of a case officer. Brent operates a borough-wide Article 4 direction removing the permitted right to convert family homes into small HMOs, and conservation areas such as Mapesbury layer further restrictions on top.
The scheme is available where all of these hold. Fail any one and it is a full application to Brent Council instead:
We prepare the notification pack Brent Council needs — plans, elevations, a site plan with the adjoining owners identified — and manage the 21-day neighbour consultation so the 42-day clock is not restarted by an incomplete submission.
Below is Brent Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Brent grants a little below the London average of householder applications, with intense conversion and HMO demand meeting firm amenity scrutiny the defining tension. Prior approval turns on neighbour amenity alone, so the drawings that matter are the ones showing the relationship to the boundary.
Source: MHCLG planning application statistics (householder decisions, rolling year). Compare every borough on our London approval-rate league table.
Tell us about your project and get a fixed, no-obligation quote back within one working day. If you don't need planning permission at all, we'll tell you that too — for free.
Across Kilburn, Willesden and Wembley, the notifications that clear without objection are the ones that treat the neighbour as the audience. We show the extension in section against the boundary, demonstrate the 45-degree daylight relationship to the nearest habitable window, and where the plot is tight we taper the depth away from the boundary rather than running the full 6 metres to the fence.
The loss of family-sized housing is resisted, so schemes that carve up larger homes must justify the mix. Where an objection does arrive, the council's assessment is narrow: loss of light, outlook and overbearing effect on the adjoining property, nothing else. A pack that has already answered those three points on the drawings usually survives an objection, whereas one that leaves them to the officer's imagination usually does not.
We prepare prior-approval notifications across Brent. A few of the areas where deep rear extensions come up most often:
Prior approval drawings for Kilburn — dense Victorian terraces, much of it converted to flats — dimensioned to the 6m and 8m limits and prepared for Brent Council's neighbour consultation.
Prior approval drawings for Willesden — Victorian and Edwardian terraces around Willesden Green — dimensioned to the 6m and 8m limits and prepared for Brent Council's neighbour consultation.
Prior approval drawings for Wembley — interwar semis and postwar housing near the stadium — dimensioned to the 6m and 8m limits and prepared for Brent Council's neighbour consultation.
Prior approval drawings for Harlesden — tightly packed Victorian terraced streets — dimensioned to the 6m and 8m limits and prepared for Brent Council's neighbour consultation.
Prior approval drawings for Kingsbury — classic 1930s Metro-land semi-detached estates — dimensioned to the 6m and 8m limits and prepared for Brent Council's neighbour consultation.
Prior approval drawings for Queen's Park — red-brick terraces framing the Queen's Park conservation area — dimensioned to the 6m and 8m limits and prepared for Brent Council's neighbour consultation.
Same extension, two routes, very different tests.
| Route | Depth allowed | What the council may consider | Timescale |
|---|---|---|---|
| Ordinary Class A permitted development | 3m attached / 4m detached | Nothing — no application needed | Immediate |
| Larger home extension prior approval | 6m attached / 8m detached | Amenity of adjoining premises, only if a neighbour objects | 21-day consultation, 42-day determination |
| Full householder application | No fixed limit | Design, materials, policy, amenity, everything | 8-week target |
| Any of these on designated land | 3m / 4m only | Prior approval scheme unavailable | Full application beyond the limits |
Limits and procedure from the GPDO 2015, Schedule 2, Part 1, Class A and paragraph A.4, made permanent by amendment in 2019.
A process built around the 21-day consultation, which is where these schemes are won or lost.
Send us your Brent postcode and house type. We confirm whether the property is on designated land, whether the scheme is available, and what depth you can realistically take.
We measure the original rear wall, eaves height, boundary distances and the neighbouring windows that the amenity assessment will turn on.
We draw the extension to the 6m or 8m limit with the boundary relationship shown in section, and prepare the written description and adjoining-owner details Brent Council needs to start the consultation.
We submit, track the 21-day consultation and the 42-day determination, respond to any objection on amenity grounds, and revise free until the decision.
Three metres on a terraced or semi-detached house and four on a detached one under ordinary permitted development. Under the larger home extension prior approval scheme those double to six and eight metres, provided you notify Brent Council before starting and the conditions on height, materials and land coverage are met. The scheme is not available on designated land.
It is a notification, not an application for permission. You tell Brent Council what you intend to build, it writes to the adjoining owners, and they have 21 days to object. If nobody objects, you may build. If someone does, the council assesses the effect on the amenity of adjoining premises and must decide within 42 days. Design and policy are not in scope.
The council then considers the impact on the amenity of the adjoining property — loss of light, loss of outlook, and overbearing effect — and nothing else. It cannot refuse because it dislikes the design or the materials. We prepare the drawings so those three questions are already answered in section and on the site plan, which is what usually carries an objected scheme through. This applies to your Brent address specifically. Brent Council is the decision-maker.
No. The larger home extension scheme is unavailable on designated land, which includes conservation areas such as Queen's Park and Mapesbury, national landscapes, national parks and world heritage sites. On those properties the ordinary 3-metre and 4-metre limits apply, and anything deeper needs a full householder application to Brent Council.
Twenty-one days for the neighbour consultation, and a maximum of 42 days from a valid submission for the council to determine it. If the council does not respond within 42 days you may proceed as notified. That deadline is the scheme's real advantage over a full application, and it is why validation completeness matters so much. This applies to your Brent address specifically. Brent Council is the decision-maker.
Yes — always. Prior approval deals only with the planning position. A 6-metre rear extension still needs building control approval for foundations, structure, drainage, thermal performance and fire safety, and the beam over the opening into the existing house needs designing and calculating. We prepare both sets so the notified scheme is the buildable one. This applies to your Brent address specifically. Brent Council is the decision-maker.
We quote each Brent scheme individually, because plot shape and the boundary relationship drive the work, and send a fixed, no-obligation quote within one working day. It covers the notification pack and free revisions until Brent Council determines it. Call 020 7864 7245 to start.
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Same fixed quotes, same fast drawings — wherever your project is.