Turn your unused Bromley garage into a bedroom, home office or open-plan kitchen-diner. Planning route assessment, full building regulations drawings with Part L thermal compliance, structural calculations for any removed walls.
For Bromley homeowners in 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, a garage conversion drawings package is the full measured-survey-to-submission drawing set London Borough of Bromley needs in order to determine an application: existing and proposed plans, elevations and sections at 1:100 and 1:50, a location and site plan, and the supporting statements the case officer asks for.
Prepared and reviewed by the chartered technologist team at Architectural Drawings London — MCIAT chartered, £2m PI insured.Last reviewed 2026-08-03.


Turn your unused Bromley garage into a bedroom, home office or open-plan kitchen-diner. Planning route assessment, full building regulations drawings with Part L thermal compliance, structural calculations for any removed walls.
Housing stock in Bromley: 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.
Character: Largest London borough by area; substantial Green Belt; conservation areas in most town centres; generally permissive elsewhere.
We check whether your Bromley garage conversion needs planning permission or qualifies as Permitted Development — most integral garages don't need planning.
Full laser-measured survey of the existing garage, plus adjacent rooms where walls are being removed.
Existing and proposed floor plans, elevations and sections at 1:50 — full council-ready specification.
Garage conversions must meet current energy-efficiency standards — upgraded insulation, glazing U-values, heating specification.
Steel beam and padstone design where garage doors are replaced with walls and windows, plus any load-bearing wall removals.
Full Plans submission to Bromley Council Building Control or an approved inspector with inspections coordinated through to completion certificate.

Single planning or regs submission.
Planning + building regs + structural.
Listed, conservation, complex sites.
Move the controls for an indicative figure. It anchors your budget — it is not a quote. Every project is priced after a free survey.
Build costs are separate and quoted by your contractor. See our published fees.
Every Bromley postcode district we draw in, the stock that dominates it and the authority that validates a garage conversion there. Bromley fees below are the statutory England rates for 2026, not garage conversion estimates.
| Postcode | Area | Dominant stock | What it means for a garage conversion |
|---|---|---|---|
| SE26 | Sydenham | Victorian villas, Edwardian terraces | SE26 straddles a boundary: Sydenham addresses fall to Lewisham Council or Bromley Council, so confirm which authority validates the garage conversion before submitting SE26 drawings. |
| SE20 | Anerley / Penge | Victorian and Edwardian terraces | SE20 straddles a boundary: Anerley / Penge addresses fall to Bromley Council or Croydon Council, so confirm which authority validates the garage conversion before submitting SE20 drawings. |
| BR1 | Bromley / Bickley | Victorian terraces, Edwardian villas, post-war flats | Bromley / Bickley sits wholly inside BR1, so Bromley Council validates every garage conversion submitted from an BR1 address. |
| BR2 | Hayes / Keston | Victorian terraces, Edwardian villas, post-war flats | BR2 covers Hayes / Keston only; Bromley Council handles the garage conversion, and Hayes / Keston case officers apply the BR2 conservation-area map. |
| BR3 | Beckenham | Edwardian villas, 1930s semi-detached | Beckenham sits wholly inside BR3, so Bromley Council validates every garage conversion submitted from an BR3 address. |
| BR4 | West Wickham | 1930s semi-detached | A garage conversion at an BR4 address in West Wickham is determined by Bromley Council under its own Local Plan policies for West Wickham. |
| BR5 | Orpington / Petts Wood | 1930s semi-detached | BR5 covers Orpington / Petts Wood only; Bromley Council handles the garage conversion, and Orpington / Petts Wood case officers apply the BR5 conservation-area map. |
| BR6 | Orpington | 1930s semi-detached | A garage conversion at an BR6 address in Orpington is determined by Bromley Council under its own Local Plan policies for Orpington. |
Roof pitch, wall build-up and plot depth change every few Bromley streets, and each one changes what a garage conversion can achieve at that address.
How designation changes a Bromley garage conversion: Bromley Council maintains 48 conservation areas, including Beckenham, Keston, Bickley. Inside any of them a Bromley garage conversion cannot rely on permitted development, and the route becomes a £548 householder application determined in 8 weeks rather than a £249 prior approval in 6 weeks. Bickley sets the tone for Bromley casework.
No blanket Article 4 over Bromley: Bromley Council has not withdrawn permitted development across Bromley, so a garage conversion outside a Bromley conservation area usually keeps it. The £274 Lawful Development Certificate is still the document a SE20 owner wants on file.
Bromley 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 garage conversion route in Bromley — 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 Bromley garage conversion 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.
Of 130 change-of-use appeals decided in Bromley over the window covering appeals decided 2016-2026, an appeal against Bromley succeeded more often than the London norm — 34.6% against 29.1% city-wide. 45 were allowed and 84 dismissed, with 1 split. Turning a garage or outbuilding into habitable space is usually decided as a change of use, and 130 such Bromley decisions were challenged far enough to reach an inspector.
Half of those Bromley appeals took more than 129 days to decide from the day the appeal started — time added on top of the council's own determination period, which is the argument for getting the application right first. 12.3% affected the setting of a listed building. 91.5% were decided by written representations rather than a hearing or inquiry, meaning the written case and the drawings were the whole of the evidence.
130 change-of-use appeals decided in Bromley. Source: Planning Inspectorate casework, OGL v3.0.
Direct answers to the questions Bromley homeowners ask every week about garage conversion drawings.
Start a free quote →Most integral garage conversions in Bromley do not require planning permission — they're classed as an internal alteration, which is not development under the TCPA 1990. However, if the conversion materially alters the external appearance (new windows, raising the roof), planning permission may be required. Detached garage conversions to habitable use always need planning. Article 4 Directions in Bromley may also affect eligibility. We confirm the planning route before quoting.
A Bromley garage conversion is one of the cheapest ways to add habitable space: our package covers the planning route assessment, building regulations drawings and structural calculations for the door opening. Build cost depends on whether the garage is integral or detached, and on insulation, flooring and services. See our fees.
Typically yes — a well-executed garage conversion in Bromley adds 10–15% to property value and costs far less per square metre than an extension. In areas where parking is not at a premium, converting an underused garage is one of the most cost-effective ways to gain living space.
A standard integral garage conversion in Bromley typically takes 4–6 weeks to build once drawings are approved. Our architectural package takes 3–4 weeks from instruction to Building Control submission. Total timeline: approximately 3–4 months from initial survey to completion.

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