Swanley and Crockenhill are Kent addresses: planning here is decided by Sevenoaks District Council, not by Bromley.
Planning permission drawings delivered by an MCIAT chartered team.
Building regulations drawings delivered by an MCIAT chartered team.
Loft conversion drawings delivered by an MCIAT chartered team.
House extension drawings delivered by an MCIAT chartered team.
Mansard roof extensions delivered by an MCIAT chartered team.
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Basement conversion drawings delivered by an MCIAT chartered team.
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BR8 primarily covers Swanley in Bromley.
Decisions for BR8 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. Free site survey across all BR8 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.
Swanley in BR8 is characterised by the housing stock of Bromley — broadly large 1930s detached and semi-detached in chislehurst and bickley.

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Every BR8 postcode district we draw in, the stock that dominates it and the authority that validates a drawing package there. BR8 fees below are the statutory England rates for 2026, not drawing package estimates.
| Postcode | Area | Dominant stock | What it means for a drawing package |
|---|---|---|---|
| BR8 | Swanley | mixed Victorian and inter-war stock | BR8 belongs to Kent. Swanley, Hextable and Crockenhill are all inside Sevenoaks District, so a drawing package from a BR8 address is lodged with Sevenoaks District Council rather than with Bromley. The postcode borrows Bromley's letters for delivery reasons; the planning boundary lies some distance to the west of it. |
| SE20 | Anerley / Penge | Victorian and Edwardian terraces | Adjoining district to BR8, also inside Bromley for drawing package purposes. |
| BR1 | Bromley / Bickley | Victorian terraces, Edwardian villas, post-war flats | Adjoining district to BR8, also inside Bromley for drawing package purposes. |
| BR2 | Hayes / Keston | Victorian terraces, Edwardian villas, post-war flats | Adjoining district to BR8, also inside Bromley for drawing package purposes. |
| BR3 | Beckenham | Edwardian villas, 1930s semi-detached | Adjoining district to BR8, also inside Bromley for drawing package purposes. |
Roof pitch, wall build-up and plot depth change every few BR8 streets, and each one changes what a drawing package can achieve at that address.
BR8 (Swanley) conservation designations: there are 48 across Bromley Council, Bromley Town, Chislehurst, Beckenham among them. Designation costs a BR8 (Swanley) 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. Bickley is the BR8 (Swanley) designation that most often changes a drawing package design.
BR8 (Swanley) permitted development status: there is no borough-wide direction from Bromley Council, so a drawing package at a BR8 address is normally still permitted development. We certify that with a £274 Lawful Development Certificate rather than leaving a BR8 (Swanley) sale to argue it later.
What BR8 (Swanley) 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 BR8 (Swanley) 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 BR8 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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