Single-storey, double-storey, rear and side extension drawings for Bromley homes — measured to Bromley Council's design guidance, delivered in days and revised free until your decision, with a free approval-odds check before you commit.
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.
Bromley homes come in a handful of recurring shapes, and each one points to a different extension. The borough is built largely from interwar and postwar semi-detached houses, Victorian villas in Beckenham and detached homes on larger plots, 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. Bromley Council judges every one of them against Bromley Local Plan and the borough's householder design guidance, 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. Green Belt and large private gardens constrain rear projections across much of the borough, so we design around it from the first sketch rather than discover it at validation.
Bromley also protects whole streets — Bromley Town, Chislehurst, Beckenham, Hayes and Keston among them. 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. 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 Bromley 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 Bromley Council if any of these apply:
We draw the footprint, the ridge and eaves heights and the neighbours' daylight on the page — the relationships Bromley 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 Bromley Council's real householder decision record, drawn 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. 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 Bromley, Beckenham and Chislehurst, 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 interwar and postwar semi-detached houses, a side-return infill frequently pairs with it to square off the plan; on wider detached homes on larger plots, a two-storey side or rear extension can add a bedroom above without swallowing the garden.
Hip-to-gable and rear dormers on paired semis are judged on roof bulk and the pair's symmetry. 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 Bromley 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 Bromley projects come up most often:
Extension drawings for Bromley's interwar semis around the town centre and Bromley Town conservation area — footprint-checked, daylight-tested and drawn to Bromley Council's guidance.
Extension drawings for Beckenham's Victorian and Edwardian villas — footprint-checked, daylight-tested and drawn to Bromley Council's guidance.
Extension drawings for Chislehurst's leafy conservation streets with Article 4 controls — footprint-checked, daylight-tested and drawn to Bromley Council's guidance.
Extension drawings for Orpington's postwar semi-detached estates — footprint-checked, daylight-tested and drawn to Bromley Council's guidance.
Extension drawings for Penge's denser Victorian terraces — footprint-checked, daylight-tested and drawn to Bromley Council's guidance.
Extension drawings for Hayes's 1930s houses near the Hayes conservation area — footprint-checked, daylight-tested and drawn to Bromley Council's guidance.
The right extension in Bromley 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 Bromley 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 Bromley Town and Chislehurst and Article 4 directions can remove permitted-development rights.
A fixed process built around how Bromley Council validates and decides householder extension applications — most drawings are submission-ready within seven days of survey.
Tell us your Bromley 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 Bromley 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 Bromley 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 Bromley 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 Bromley you will need to apply to Bromley 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 Bromley Town and Chislehurst.
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 Bromley Council and a neighbour-consultation period, and it does not apply on designated land such as Bromley'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 Bromley 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 Bromley 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. Bromley 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 Bromley Council's building control or an approved inspector can sign the work off.
Every house and brief is different, so we price each Bromley extension individually and send a fixed, no-obligation quote back within one working day. It covers the full drawing pack with free revisions until Bromley 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.