Chelsea / Brompton — covered by RBKC Planning.
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.
Garage conversion drawings delivered by an MCIAT chartered team.
Basement conversion drawings delivered by an MCIAT chartered team.
Structural calculations delivered by an MCIAT chartered team.
Measured building survey delivered by an MCIAT chartered team.
Party wall services delivered by an MCIAT chartered team.
Rear dormer drawings delivered by an MCIAT chartered team.


SW3 primarily covers Chelsea / Brompton in Kensington and Chelsea.
Decisions for SW3 are made by RBKC Planning. 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 Kensington and Chelsea: Yes.
Building regs from £950. We do not charge hourly. Free site survey across all SW3 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. RBKC Planning timelines align with the national norm.
Chelsea / Brompton in SW3 is characterised by the housing stock of Kensington and Chelsea — broadly grand white stucco regency and victorian terraces.

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Every SW3 postcode district we draw in, the stock that dominates it and the authority that validates a drawing package there. SW3 fees below are the statutory England rates for 2026, not drawing package estimates.
| Postcode | Area | Dominant stock | What it means for a drawing package |
|---|---|---|---|
| SW3 | Chelsea / Brompton | Georgian and Victorian terraces, listed buildings | SW3 covers Chelsea / Brompton only; RBKC Planning handles the drawing package. |
| SW3 | Chelsea | Georgian and Victorian terraces, listed buildings | Chelsea sits inside SW3; drawing package proposals here are determined by RBKC Planning. |
| SW3 | Brompton | Stucco terraces, Edwardian mansion blocks | Brompton sits inside SW3; drawing package proposals here are determined by RBKC Planning. |
| SW5 | Earl's Court | Stucco terraces, Edwardian mansion blocks | Adjoining district to SW3, also inside Kensington and Chelsea for drawing package purposes. |
| SW7 | South Kensington / Knightsbridge | Stucco terraces, mansion blocks, listed buildings | Adjoining district to SW3, also inside Kensington and Chelsea for drawing package purposes. |
| SW10 | West Brompton / World's End | Georgian and Victorian terraces, listed buildings | Adjoining district to SW3, also inside Kensington and Chelsea for drawing package purposes. |
Roof pitch, wall build-up and plot depth change every few SW3 streets, and each one changes what a drawing package can achieve at that address.
SW3 (Chelsea / Brompton) conservation designations: there are 38 across RBKC Planning, Kensington, Chelsea, Notting Hill among them. Designation costs a SW3 (Chelsea / Brompton) 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. Earls Court is the SW3 (Chelsea / Brompton) designation that most often changes a drawing package design.
SW3 (Chelsea / Brompton) and Article 4: Article 4 Directions covering HMOs, office-to-residential, and basement developments — RBKC has some of the strictest basement policies in London. A drawing package planned at a SW3 address is checked against that direction first; RBKC Planning publishes the SW3 (Chelsea / Brompton) extent, and the SW3 line rarely follows the SW3 (Chelsea / Brompton) boundary you would expect.
SW3 (Chelsea / Brompton) below-ground policy: RBKC's basement policy (post-2015) limits to single-storey under 50% of garden area; double-storey basements effectively prohibited in residential streets. Any drawing package in SW3 (Chelsea / Brompton) that goes below existing foundations triggers two months notice under section 6 of the Party Wall etc. Act 1996, and RBKC Planning will want the SW3 ground and groundwater position set out.
SW3 (Chelsea / Brompton) housing stock: Grand white stucco Regency and Victorian terraces; red-brick Queen Anne mansions in Kensington; Edwardian mansion blocks; almost no post-war housing stock. Internationally wealthy residents; extensive listed building coverage; heritage and streetscape prioritised in every decision. Read that before choosing a drawing package route in SW3 (Chelsea / Brompton) — construction, not postcode, sets what is achievable. RBKC Planning charges £548 for a householder application and has 8 weeks to determine it.
Sources for this SW3 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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