Single-storey, double-storey, rear and side extension drawings for Brent homes — measured to Brent Council's design guidance, delivered in days and revised free until your decision, with a free approval-odds check before you commit.
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.
Brent homes come in a handful of recurring shapes, and each one points to a different extension. The borough is built largely from Victorian and Edwardian terraces across Kilburn and Willesden, interwar semi-detached houses around Wembley and Kingsbury and converted period flats and maisonettes, so a Victorian terrace usually wants a rear or side-return infill, while an interwar semi has room for a wider single-storey wrap or a two-storey side addition. Brent Council judges every one of them against Brent Local Plan and the Design Guide for New Development SPD, weighing footprint, height and the impact on the house next door before it looks at the elevations.
That is why the drawings decide the outcome. We set the extension depth against the permitted-development limits precisely, keep the eaves and ridge within the allowances, and plot the 45-degree daylight lines to the neighbours' windows so the case officer can see the amenity test is passed. Flat conversions and HMOs draw heightened scrutiny on amenity, refuse storage and cycle parking given the borough's Article 4 stance, so we design around it from the first sketch rather than discover it at validation.
Brent also protects whole streets — Queen's Park, Mapesbury, Sudbury Court, Roundwood and Brondesbury among them. 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. On designated land the larger-home extension route and most side extensions stop being permitted development, so we confirm your address against those layers before drawing a line.
Plenty of Brent extensions are permitted development and need no planning application — a single-storey rear extension within the depth and height limits is the common case. You will normally need to apply to Brent Council if any of these apply:
We draw the footprint, the ridge and eaves heights and the neighbours' daylight on the page — the relationships Brent Council's officers weigh first — and submit a validation-complete pack, whether that is a lawful development certificate, a prior-approval notification or a full householder application.
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. A complete, policy-literate extension pack anticipates those pressure points before submission, which is why professionally drawn applications are decided faster and refused less often than DIY ones.
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 extension that lands most often is the single-storey rear addition — a glazed kitchen-diner across the back of the house, kept within the permitted-development depth or taken to a full application where the ground floor wants more. On the borough's victorian and edwardian terraces across kilburn and willesden, a side-return infill frequently pairs with it to square off the plan; on wider converted period flats and maisonettes, a two-storey side or rear extension can add a bedroom above without swallowing the garden.
The loss of family-sized housing is resisted, so schemes that carve up larger homes must justify the mix. We size the extension to the amenity and daylight tests, match the roof and materials to the host house, and keep enough garden to satisfy Brent Council's space standards — so the scheme answers the borough's questions before an objection can raise them. Where permitted-development rights are used up or removed, we prepare the householder application to the council's extension design guidance instead.
We draw extensions on every street in the borough. A few of the neighbourhoods where Brent projects come up most often:
Extension drawings for Kilburn's dense Victorian terraces, much of it converted to flats — footprint-checked, daylight-tested and drawn to Brent Council's guidance.
Extension drawings for Willesden's Victorian and Edwardian terraces around Willesden Green — footprint-checked, daylight-tested and drawn to Brent Council's guidance.
Extension drawings for Wembley's interwar semis and postwar housing near the stadium — footprint-checked, daylight-tested and drawn to Brent Council's guidance.
Extension drawings for Harlesden's tightly packed Victorian terraced streets — footprint-checked, daylight-tested and drawn to Brent Council's guidance.
Extension drawings for Kingsbury's classic 1930s Metro-land semi-detached estates — footprint-checked, daylight-tested and drawn to Brent Council's guidance.
Extension drawings for Queen's Park's red-brick terraces framing the Queen's Park conservation area — footprint-checked, daylight-tested and drawn to Brent Council's guidance.
The right extension in Brent depends on your house type and how much garden you can give up. This is how the main options compare on planning route and what they add.
| Extension type | Permitted development? | What it adds | What Brent Council checks |
|---|---|---|---|
| Single-storey rear | Often, within 3m/4m depth (6m/8m via prior approval) | Bigger kitchen-diner across the back | Depth, height, neighbour daylight (45°) |
| Side-return infill | Sometimes, if within width and height limits | Squares off an L-shaped ground floor | Width vs the original house, glazing to boundary |
| Two-storey rear/side | No — full application | Extra bedroom or bathroom above | Bulk, overlooking, 7m rear-boundary gap |
| Wraparound (rear + side) | No — full application | Whole-width open-plan ground floor | Combined footprint and garden retained |
Route depends on your street — conservation areas such as Queen's Park and Mapesbury and Article 4 directions can remove permitted-development rights.
A fixed process built around how Brent Council validates and decides householder extension applications — most drawings are submission-ready within seven days of survey.
Tell us your Brent postcode and house type. We confirm your conservation and Article 4 status, how much permitted-development depth you have left, and score your odds against live Brent Council decisions.
We measure the existing footprint, floor and eaves levels, boundary distances and the neighbours' window positions — the numbers the depth limits and daylight tests depend on.
Chartered designers develop the single-storey, two-storey or side extension to your brief, drawn inside the permitted-development limits or to Brent Council's extension design guidance.
We submit the certificate, prior-approval notice or application, manage validation and case-officer queries, and revise the drawings free until Brent Council issues its decision.
Not always. A single-storey rear extension up to 3 metres deep on a terrace or semi, or 4 metres on a detached house, and no higher than 4 metres, is usually permitted development. In Brent you will need to apply to Brent Council for two-storey extensions, side extensions wider than half the house, anything forward of the front wall, deeper rear extensions under the larger-home prior-approval route, and any extension in a conservation area such as Queen's Park and Mapesbury.
Standard permitted development allows 3 metres on a terraced or semi-detached house and 4 metres on a detached one. The larger-home extension scheme can double that to 6 or 8 metres, but it needs a prior-approval notification to Brent Council and a neighbour-consultation period, and it does not apply on designated land such as Brent's conservation areas. We confirm which route your property qualifies for before drawing.
Two-storey and double-storey extensions almost always need a full householder application to Brent Council, because they fall outside permitted development on most homes. The council looks closely at bulk, overlooking of neighbours and the 7-metre gap a two-storey rear extension must keep from the rear boundary. We design to those tests and show the daylight and privacy angles on the drawings.
A householder planning application in Brent runs to a statutory eight-week target, a larger-home prior-approval notification to around six weeks including the neighbour-consultation period, and a lawful development certificate to eight weeks. Incomplete submissions stall at validation, so we submit a complete pack and manage officer queries to keep the decision on schedule. Brent Council is the decision-maker.
Yes — planning permission and building regulations are separate consents, and almost every extension needs both. Planning governs whether you can build it; building control governs how it is built, covering structure, insulation, drainage and fire safety. We prepare the building-regulations drawings alongside the planning set so Brent Council's building control or a registered building control approver can sign the work off.
Every house and brief is different, so we price each Brent extension individually and send a fixed, no-obligation quote back within one working day. It covers the full drawing pack with free revisions until Brent Council approves, and we tell you upfront whether your extension qualifies as permitted development. Call 020 7864 7245 to get started.
Answer five quick questions and get a free planning score for your exact address — instantly. Then, if you want the full picture, unlock the detailed analysis: your council's live approval rates, local precedents, constraints on your street and a step-by-step route to permission.
Same fixed quotes, same fast drawings — wherever your project is.