House Extensions · BR6 Orpington
Bromley protects the Petts Wood conservation area, a planned 1930s metro-land estate with design controls on the original house style, alongside standard householder control across BR6.
This page covers one part of the borough. For the full picture — fees, timelines and the council's current position — read house extensions in Bromley.
House extensions in Orpington are dominated by single-storey rear and side-return additions on BR6's inter-war and post-war semis and detached houses, with double-storey and wrap-around schemes where the plot allows. Bromley Council weighs depth, height and neighbour daylight; many extensions across Orpington, Petts Wood, Crofton, Chelsfield fringe are Permitted Development, which we confirm with a Lawful Development Certificate before you build.
The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with detailed technical phase, ideal for inter-war and post-war semis and detached houses typical of Orpington.
Across Orpington, Petts Wood, Crofton, Chelsfield fringe in BR6, the dominant property is inter-war and post-war semis and detached houses around orpington and petts wood, with the planned petts wood estate. That stock shapes what house extension drawings looks like here: the right approach for a period terrace differs from a mansion-block flat or a new-build, and Bromley Council judges each on design quality and neighbour impact. We survey the specific Orpington property, confirm the planning route — Permitted Development, a Lawful Development Certificate, or full planning — and draw a council-ready set tailored to the BR6 streetscape.
Housing stock in BR6: Inter-war and post-war semis and detached houses around Orpington and Petts Wood, with the planned Petts Wood estate.
Within the district: Orpington, Petts Wood, Crofton, Chelsfield fringe.
Streets we know in BR6: the Petts Wood estate roads, the Crofton streets and the inter-war roads around Orpington station. Each road has its own building line, boundary treatment and precedent that Bromley Council weighs when assessing a house extension drawings scheme.
Conservation areas: Petts Wood. Inside these, most external work needs full planning and a Heritage Statement.
Getting around BR6: Orpington and Petts Wood on the fast line into London Bridge and Charing Cross.
Regeneration: Orpington falls within or beside the Orpington town centre, which shapes local planning policy and design expectations.
Property values: semi-detached homes made up 1,238 of Bromley's 2025 sales at a £625,000 median, and detached 737 at £910,000. The BR6 district median of £570,000 counts flats as well as houses.
Borough character: Largest London borough by area; substantial Green Belt; conservation areas in most town centres; generally permissive elsewhere.
Measured existing survey, photographic record, Article 4 and conservation check specific to Orpington before we quote.
2–3 design options at concept stage — alternative layouts, glazing, roof forms.
Site location plan, existing and proposed plans, elevations, sections, D&AS where required.
Part L thermal, Part B fire, Part M accessibility, structural strategy.
Steel beam, foundation, lintel design. Chartered engineer sign-off.
Party Wall notices where needed; Thames Water Build Over Agreement where within 3m of a public sewer.
Single planning or building-regs submission.
Planning + building regs + structural.
Listed, conservation or complex sites.
Because BR6 is a settled family market of inter-war and post-war semis and detached houses — ideal for rear, side and wrap-around extensions and loft conversions. Outside the Petts Wood conservation area, much runs on the Permitted Development route, confirmed with a Lawful Development Certificate.
Yes — the Petts Wood conservation area protects the planned 1930s metro-land estate, with controls on the original house style, front boundaries and rooflines, so external changes there need full planning. We design sympathetically to the estate character and handle the Bromley application.
Usually yes on the semis and detached houses outside the conservation area — a hip-to-gable plus rear dormer within the volume allowance, confirmed by a Lawful Development Certificate. We check the head height and any Petts Wood constraint, then draw the scheme for Building Control too.
BR6 offers strong commuter value.
Bromley Council charges its own statutory application fee (currently £548 for a householder planning application, £610 for a full application). We quote the drawings as one fixed price and the free site survey covers every BR6 address.
For a BR6 project across Orpington, Petts Wood, Crofton, Chelsfield fringe, expect roughly 3–4 weeks from instruction to submission: week 1 the measured survey, weeks 2–3 the drawings and your revisions, then validation and the statutory determination by Bromley Council (8 weeks for a householder application). We carry the Orpington application through every officer query to the decision.
Orpington (BR6) sits primarily in Bromley, so applications are decided by Bromley Council. Conservation areas within BR6 include Petts Wood, where full planning and a Heritage Statement are required. We confirm the planning route for your exact address before quoting.
Almost always. Any structural work behind house extension drawings in Orpington — new openings, steel beams, loft floors, foundations — needs Building Regulations approval covering structure (Part A), fire escape (Part B) and insulation (Part L), submitted to Bromley Council Building Control or an approved inspector. On BR6's typically terraced and semi-detached stock, a Party Wall notice to adjoining neighbours is normally required before the steelwork. We coordinate both as part of the Complete package.
In value terms, yes. The bigger risk is an unapproved or non-compliant scheme — which is why council-ready drawings and a clean Building Control sign-off matter on BR6 homes.
Working across a borough boundary, or unsure which council will decide your application? Every service we offer is listed for SE9, SE12, SE20, SE26, BR1, BR2, BR3 and BR7.
Pick a slot that suits you. No obligation and no sales pressure, just straight answers on your planning route.
Every BR6 postcode district we draw in, the stock that dominates it and the authority that validates a house extension there. BR6 fees below are the statutory England rates for 2026, not house extension estimates.
| Postcode | Area | Dominant stock | What it means for a house extension |
|---|---|---|---|
| BR6 | Orpington | 1930s semi-detached | BR6 covers Orpington only; Bromley Council handles the house extension. |
| SE20 | Anerley / Penge | Victorian and Edwardian terraces | Adjoining district to BR6, also inside Bromley for house extension purposes. |
| BR1 | Bromley / Bickley | Victorian terraces, Edwardian villas, post-war flats | Adjoining district to BR6, also inside Bromley for house extension purposes. |
| BR2 | Hayes / Keston | Victorian terraces, Edwardian villas, post-war flats | Adjoining district to BR6, also inside Bromley for house extension purposes. |
| BR3 | Beckenham | Edwardian villas, 1930s semi-detached | Adjoining district to BR6, also inside Bromley for house extension purposes. |
Roof pitch, wall build-up and plot depth change every few BR6 streets, and each one changes what a house extension can achieve at that address.
Conservation areas covering BR6 (Orpington): Bromley Council runs 48, and Beckenham, Keston, Bickley are the ones BR6 (Orpington) owners meet most. A house extension inside a BR6 (Orpington) conservation area loses permitted development, so the BR6 (Orpington) submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Keston a house extension is judged on the street elevation first.
Article 4 and your BR6 (Orpington) house extension: Bromley Council has made no borough-wide direction, so permitted development for a house extension in BR6 (Orpington) generally survives outside BR6 (Orpington) conservation areas and listed curtilages. A Lawful Development Certificate at £274 is how a BR6 owner records that a house extension was lawful.
BR6 (Orpington) housing stock: Large 1930s detached and semi-detached in Chislehurst and Bickley; Edwardian in Beckenham; Victorian in Bromley town; Metropolitan Green Belt covers significant rural-fringe land. Largest London borough by area; substantial Green Belt; conservation areas in most town centres; generally permissive elsewhere. Read that before choosing a house extension route in BR6 (Orpington) — construction, not postcode, sets what is achievable. Bromley Council charges £548 for a householder application and has 8 weeks to determine it.
Sources for this BR6 house extension page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.
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