Back-of-house extension drawings for Brentwood homes — the glazed kitchen-diner across the rear, drawn to Brentwood Borough Council's depth and daylight limits, delivered in days and revised free until your decision, with a free approval-odds check first.
Brentwood Borough Council granted 84% of the householder planning decisions it made in its latest published year — 3 points below the 87% England-wide householder average. Roughly 89% of the borough is Metropolitan Green Belt, so most growth is steered to allocated sites and village and countryside proposals face strict very-special-circumstances tests, which is where a policy-literate drawing pack earns its keep. Its dominant Georgian (1714–1837), Victorian (1837–1901), Edwardian (1901–1910), interwar (1918–1939) and postwar (1945–1970) housing stock sets the design brief on most streets.
Under Class B, a rear dormer stays permitted development up to 40m³ of added roof volume on a terrace or 50m³ on a semi-detached or detached house, while Class A allows a single-storey rear extension of 3m beyond the original rear wall on a terrace and 4m on a detached house before a full application is needed. Brentwood carries at least one Article 4 direction, and conservation areas including Brentwood Town Centre, Hutton Village and Ingatestone Village Centre remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Brentwood is determined against an 8-week statutory target.
Brentwood (the town centre with Victorian and Edwardian terraces and a High Street conservation area), Shenfield (affluent interwar and postwar semis and detached houses at the Elizabeth line commuter hub), Hutton (interwar-to-modern suburban housing, with the prestige detached enclave of Hutton Mount), Ingatestone (a historic village with a Georgian and timber-framed core and a station-area conservation zone), Blackmore (a green-belt village of timber-framed and period cottages around the green) and Herongate (a small green-belt village of rural detached and period housing) — these are the Brentwood pockets our drawings cover most. Heritage designations here include Brentwood Town Centre, Hutton Village, Ingatestone Village Centre, Blackmore, South Weald and Herongate. Brentwood Borough Council weighs each proposal against the Brentwood Local Plan 2016–2033 (adopted March 2022), where woodland Article 4 directions remove permitted-development rights over designated woodlands to protect habitat. Converted flats appear around Brentwood town centre and Shenfield station, and none of them hold householder permitted-development rights.. On roofs the borough is hipped roofs on the interwar and postwar suburban semis and steep tiled and gabled roofs on the timber-framed village cottages, over Victorian and Edwardian and twentieth-century suburban housing around Brentwood and Shenfield, the interwar detached enclave of Hutton Mount, timber-framed and Georgian cores in the historic villages of Ingatestone and Blackmore and rural detached and period housing across the green-belt villages.
The rear extension is the workhorse of Brentwood home improvement — it is how a dark back kitchen becomes an open family room facing the garden. Because the borough is built largely from Victorian and Edwardian and twentieth-century suburban housing around Brentwood and Shenfield, the interwar detached enclave of Hutton Mount, timber-framed and Georgian cores in the historic villages of Ingatestone and Blackmore and rural detached and period housing across the green-belt villages, most back walls sit close to a neighbour on at least one side, and that proximity, not the design, is what Brentwood Borough Council scrutinises. The council reads the proposal against the Brentwood Local Plan 2016–2033 (adopted March 2022), and the first line an officer draws is the 45-degree splay from the neighbour's nearest window.
So the drawings live or die on geometry. We set the depth against the exact permitted-development figure, hold the eaves and the flat-roof or lantern build-up under the 4-metre height ceiling, and show the projection tested against both the 45-degree plan angle and the 25-degree section angle to the neighbouring windows. Roughly 89% of the borough is Metropolitan Green Belt, so most growth is steered to allocated sites and village and countryside proposals face strict very-special-circumstances tests, so the rear elevation is composed around it rather than corrected after an objection.
Where the property sits in a conservation area — Brentwood Town Centre, Hutton Village, Ingatestone Village Centre, Blackmore, South Weald and Herongate among Brentwood's — the larger-home extension route is switched off and even a modest rear addition needs consent. Brentwood's Article 4 directions are used chiefly to withdraw permitted-development rights over designated woodlands so that works there require planning permission, and the borough's thirteen conservation areas such as Hutton Village and Ingatestone add further character controls. We confirm the designation before the survey.
Many single-storey rear extensions in Brentwood are permitted development and need no application. You will normally need to apply to Brentwood Borough Council, or use the larger-home prior-approval route, if any of these apply:
We draw the depth, the roof build-up and the daylight splays to each neighbour on the page — the tests Brentwood Borough Council's officers apply first — and submit a validation-complete pack, whether that is a lawful development certificate, a larger-home prior-approval notice or a full householder application.
Below is Brentwood Borough Council's real householder decision record, taken from official planning statistics and refreshed as new data lands. Brentwood grants a little below the national average of applications, with heavy Green Belt coverage and conservation-village character the pressures that shape most schemes. Rear extensions turn most often on neighbour daylight and depth, so a drawing pack that proves those tests upfront is decided faster and refused less often than a DIY submission.
Source: MHCLG planning application statistics (householder decisions, England, 1 April 2025 - 31 March 2026). 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 Brentwood, Shenfield and Hutton, the approved rear extension is typically a single-storey glazed box within the depth limit, roofed either flat with a lantern or in a shallow mono-pitch, and finished in brick or render to match the host wall. On the borough's victorian and edwardian and twentieth-century suburban housing around brentwood and shenfield, keeping the projection to the permitted-development figure often avoids an application entirely; where owners want the full 6 metres, the larger-home route succeeds when the neighbour-consultation period passes without a sustained objection.
Woodland Article 4 directions remove permitted-development rights over designated woodlands to protect habitat. We keep the extension inside the daylight splays, set any glazed roof below the first-floor cill, and retain the garden depth Brentwood Borough Council expects — so the back elevation answers the amenity case before a neighbour can lodge one. Two-storey rear extensions we draw with the 7-metre boundary gap and privacy screening resolved on the plan.
We draw rear extensions on every street in the borough. A few of the neighbourhoods where Brentwood back-of-house projects come up most often:
Rear extension drawings for Brentwood's the town centre with Victorian and Edwardian terraces and a High Street conservation area — depth-checked, daylight-tested and drawn to Brentwood Borough Council's guidance.
Rear extension drawings for Shenfield's affluent interwar and postwar semis and detached houses at the Elizabeth line commuter hub — depth-checked, daylight-tested and drawn to Brentwood Borough Council's guidance.
Rear extension drawings for Hutton's interwar-to-modern suburban housing, with the prestige detached enclave of Hutton Mount — depth-checked, daylight-tested and drawn to Brentwood Borough Council's guidance.
Rear extension drawings for Ingatestone's a historic village with a Georgian and timber-framed core and a station-area conservation zone — depth-checked, daylight-tested and drawn to Brentwood Borough Council's guidance.
Rear extension drawings for Blackmore's a green-belt village of timber-framed and period cottages around the green — depth-checked, daylight-tested and drawn to Brentwood Borough Council's guidance.
Rear extension drawings for Herongate's a small green-belt village of rural detached and period housing — depth-checked, daylight-tested and drawn to Brentwood Borough Council's guidance.
How far you can extend at the back in Brentwood depends on your house type and the route you take. This is how the options compare.
| Route | Depth allowed | Consent needed | What Brentwood Borough Council checks |
|---|---|---|---|
| Standard permitted development | 3m terrace/semi · 4m detached | Lawful development certificate (optional) | Depth, 4m height, materials |
| Larger-home prior approval | 6m terrace/semi · 8m detached | Prior-approval notice + neighbour consultation | Neighbour objections on amenity |
| Full householder application | Beyond the above, or two-storey | Full planning permission | Daylight (45°/25°), bulk, garden retained |
| Conservation area | Case by case | Full planning permission | Character, roof form, boundary treatment |
The larger-home route is switched off on designated land — conservation areas such as Brentwood Town Centre and Hutton Village and Article 4 streets need a full application.
A fixed process built around how Brentwood Borough Council validates and decides rear-extension applications — most drawings are submission-ready within seven days of survey.
Send us your Brentwood postcode and house type. We confirm your conservation and Article 4 status, how much rear-extension depth you have under permitted development, and score your odds against live Brentwood Borough Council decisions.
We measure the original rear wall, floor and eaves levels, side and rear boundary distances and the neighbours' window positions — the numbers the depth limit and daylight splays depend on.
Chartered designers develop the single or two-storey rear extension to your brief, drawn inside the permitted-development limits or to Brentwood Borough Council's extension design guidance, with the daylight angles shown.
We submit the certificate, prior-approval notice or application, handle validation and case-officer queries, and revise the drawings free until Brentwood Borough Council issues its decision.
Often not. 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 Brentwood. You will need to involve Brentwood Borough Council for anything deeper via the larger-home route, for two-storey rear extensions, and for any rear extension in a conservation area such as Brentwood Town Centre and Hutton Village, where those permitted-development rights fall away.
The larger-home extension scheme lets a single-storey rear extension reach 6 metres on a terrace or semi, or 8 metres on a detached house — double the standard allowance. It is not automatic: you submit a prior-approval notification to Brentwood Borough Council, neighbours are consulted, and if one objects on amenity grounds the council rules on it. It also does not apply on designated land such as Brentwood's conservation areas.
It is the daylight test Brentwood Borough Council applies to protect neighbours. Drawn on plan, a line at 45 degrees from the midpoint of the neighbour's nearest ground-floor window should not be crossed by your extension; a companion 25-degree line is checked in section. If the projection breaches it, the extension is likely to be shortened or refused, so we test and prove it on the drawings before submission.
A two-storey rear extension almost always needs a full householder application to Brentwood Borough Council, as it sits outside permitted development on most homes. The council checks that it stays at least 7 metres from the rear boundary, does not overbear the neighbours and avoids new overlooking. We resolve the boundary gap, privacy and daylight on the plans so the application is decided on its merits.
Frequently, yes. If the rear extension involves work to a shared wall, building up to the boundary, or excavating foundations near a neighbour's structure, the Party Wall etc. Act applies and you must serve notice — this is separate from Brentwood Borough Council's planning decision. We flag it early and can prepare the drawings a party-wall surveyor needs alongside the planning set.
We price each Brentwood rear extension on its own footprint and send a fixed, no-obligation quote within one working day. It covers the full drawing pack with free revisions until Brentwood Borough Council approves, and we confirm at the outset whether your extension is permitted development, needs prior approval, or a full application. Call 020 7864 7245 to begin.
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.