Back-of-house extension drawings for Bromley homes — the glazed kitchen-diner across the rear, drawn to Bromley Council's depth and daylight limits, delivered in days and revised free until your decision, with a free approval-odds check first.
Bromley Council granted 83% of the householder planning decisions it made in its latest published year — 4 points below the 87% England-wide householder average. Green Belt and large private gardens constrain rear projections across much of the borough, 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.
Class A and Class B set the thresholds — a rear dormer to 40m³ on a terrace or 50m³ on a semi or detached, and a single-storey rear extension to 3m on a terrace or 4m on a detached house — beyond which Bromley Council needs a full application. Bromley carries at least one Article 4 direction, and conservation areas including Bromley Town, Chislehurst and Beckenham remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Bromley is determined against an 8-week statutory target.
Bromley (interwar semis around the town centre and Bromley Town conservation area), Beckenham (Victorian and Edwardian villas), Chislehurst (leafy conservation streets with Article 4 controls), Orpington (postwar semi-detached estates), Penge (denser Victorian terraces) and Hayes (1930s houses near the Hayes conservation area) — these are the Bromley pockets our drawings cover most. Heritage designations here include Bromley Town, Chislehurst, Beckenham, Hayes and Keston. Bromley Council weighs each proposal against Bromley Local Plan and the borough's householder design guidance, where hip-to-gable and rear dormers on paired semis are judged on roof bulk and the pair's symmetry. On roofs the borough is hipped roofs on the interwar semis and gabled roofs on the villas, over interwar and postwar semi-detached houses, Victorian villas in Beckenham and detached homes on larger plots.
The rear extension is the workhorse of Bromley home improvement — it is how a dark back kitchen becomes an open family room facing the garden. Because the borough is built largely from interwar and postwar semi-detached houses, Victorian villas in Beckenham and detached homes on larger plots, most back walls sit close to a neighbour on at least one side, and that proximity, not the design, is what Bromley Council scrutinises. The council reads the proposal against Bromley Local Plan and the borough's householder design guidance, 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. Green Belt and large private gardens constrain rear projections across much of the borough, so the rear elevation is composed around it rather than corrected after an objection.
Where the property sits in a conservation area — Bromley Town, Chislehurst, Beckenham, Hayes and Keston among Bromley's — the larger-home extension route is switched off and even a modest rear addition needs consent. Chislehurst and several of Bromley's leafier conservation areas carry Article 4 directions, and large parts of the borough sit within Metropolitan Green Belt where extensions are tightly controlled. We confirm the designation before the survey.
Many single-storey rear extensions in Bromley are permitted development and need no application. You will normally need to apply to Bromley 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 Bromley 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 Bromley Council's real householder decision record, taken from official planning statistics and refreshed as new data lands. Bromley grants a solid majority of householder applications, though Green Belt coverage and the symmetry of paired semis shape what gets approved on many streets. 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, 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 Bromley, Beckenham and Chislehurst, 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 interwar and postwar semi-detached houses, 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.
Hip-to-gable and rear dormers on paired semis are judged on roof bulk and the pair's symmetry. We keep the extension inside the daylight splays, set any glazed roof below the first-floor cill, and retain the garden depth Bromley 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 Bromley back-of-house projects come up most often:
Rear extension drawings for Bromley's interwar semis around the town centre and Bromley Town conservation area — depth-checked, daylight-tested and drawn to Bromley Council's guidance.
Rear extension drawings for Beckenham's Victorian and Edwardian villas — depth-checked, daylight-tested and drawn to Bromley Council's guidance.
Rear extension drawings for Chislehurst's leafy conservation streets with Article 4 controls — depth-checked, daylight-tested and drawn to Bromley Council's guidance.
Rear extension drawings for Orpington's postwar semi-detached estates — depth-checked, daylight-tested and drawn to Bromley Council's guidance.
Rear extension drawings for Penge's denser Victorian terraces — depth-checked, daylight-tested and drawn to Bromley Council's guidance.
Rear extension drawings for Hayes's 1930s houses near the Hayes conservation area — depth-checked, daylight-tested and drawn to Bromley Council's guidance.
How far you can extend at the back in Bromley depends on your house type and the route you take. This is how the options compare.
| Route | Depth allowed | Consent needed | What Bromley 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 Bromley Town and Chislehurst and Article 4 streets need a full application.
A fixed process built around how Bromley Council validates and decides rear-extension applications — most drawings are submission-ready within seven days of survey.
Send us your Bromley 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 Bromley 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 Bromley 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 Bromley 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 Bromley. You will need to involve Bromley 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 Bromley Town and Chislehurst, 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 Bromley 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 Bromley's conservation areas.
It is the daylight test Bromley 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 Bromley 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 Bromley 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 Bromley 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 Bromley 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.
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Same fixed quotes, same fast drawings — wherever your project is.