Beckenham — covered by Bromley Council.
Planning permission drawings delivered by a CIAT-affiliated team.
Building regulations drawings delivered by a CIAT-affiliated team.
Loft conversion drawings delivered by a CIAT-affiliated team.
House extension drawings delivered by a CIAT-affiliated team.
Mansard roof extensions delivered by a CIAT-affiliated team.
Garage conversion drawings delivered by a CIAT-affiliated team.
Basement conversion drawings delivered by a CIAT-affiliated team.
Structural calculations delivered by a CIAT-affiliated team.
Measured building survey delivered by a CIAT-affiliated team.
Party wall services delivered by a CIAT-affiliated team.
Rear dormer drawings delivered by a CIAT-affiliated team.


BR3 primarily covers Beckenham in Bromley.
Decisions for BR3 are made by Bromley Council. Standard Permitted Development rules apply for most rear extensions and loft conversions on terraced and semi-detached houses, unless the property is in a conservation area, is listed, or sits under an Article 4 Direction. Article 4 in Bromley: No.
Building regs from £950. We do not charge hourly. Site survey across all BR3 addresses.
From first call to planning decision: typically 12–14 weeks. Site survey week 1, design weeks 2–3, validation 1–2 weeks, statutory 8-week determination. Bromley Council timelines align with the national norm.
Beckenham in BR3 is characterised by the housing stock of Bromley — broadly large 1930s detached and semi-detached in chislehurst and bickley.

Every BR3 postcode district we draw in, the stock that dominates it and the authority that validates a drawing package there. BR3 fees below are the statutory England rates for 2026, not drawing package estimates.
| Postcode | Area | Dominant stock | What it means for a drawing package |
|---|---|---|---|
| BR3 | Beckenham | Edwardian villas, 1930s semi-detached | Beckenham sits wholly inside BR3, so Bromley Council validates every drawing package submitted from an BR3 address. |
| SE20 | Anerley / Penge | Victorian and Edwardian terraces | Adjoining district to BR3, also inside Bromley for drawing package purposes. |
| BR1 | Bromley / Bickley | Victorian terraces, Edwardian villas, post-war flats | Adjoining district to BR3, also inside Bromley for drawing package purposes. |
| BR2 | Hayes / Keston | Victorian terraces, Edwardian villas, post-war flats | Adjoining district to BR3, also inside Bromley for drawing package purposes. |
Roof pitch, wall build-up and plot depth change every few BR3 streets, and each one changes what a drawing package can achieve at that address.
BR3 (Beckenham) conservation designations: there are 48 across Bromley Council, Keston, Bickley, Bromley Town among them. Designation costs a BR3 (Beckenham) owner the permitted-development route: a drawing package then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Chislehurst is the BR3 (Beckenham) designation that most often changes a drawing package design.
No blanket Article 4 over BR3 (Beckenham): Bromley Council has not withdrawn permitted development across BR3 (Beckenham), so a drawing package outside a BR3 (Beckenham) conservation area usually keeps it. The £274 Lawful Development Certificate is still the document a BR3 owner wants on file.
What BR3 (Beckenham) is built from: 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. That mix decides the drawing package route in BR3 (Beckenham) more than the postcode does, and it is what a Bromley Council case officer reads first. A householder application costs £548 paid to Bromley Council direct, with 8 weeks to a decision once validated.
Sources for this BR3 drawing package 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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