Westminster / Vincent Square — covered by Westminster City Council.
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.


SW1P primarily covers Westminster / Vincent Square in Westminster.
Decisions for SW1P are made by Westminster City 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 Westminster: Yes.
Building regs from £950. We do not charge hourly. Free site survey across all SW1P 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. Westminster City Council timelines align with the national norm.
Westminster / Vincent Square in SW1P is characterised by the housing stock of Westminster — broadly grand georgian and regency terraces in belgravia and pimlico.

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Every SW1P postcode district we draw in, the stock that dominates it and the authority that validates a drawing package there. SW1P fees below are the statutory England rates for 2026, not drawing package estimates.
| Postcode | Area | Dominant stock | What it means for a drawing package |
|---|---|---|---|
| SW1P | Westminster / Vincent Square | mixed Victorian and inter-war stock | SW1P covers Westminster / Vincent Square only; Westminster City Council handles the drawing package. |
| NW8 | St John's Wood | Victorian villas, mansion blocks | Adjoining district to SW1P, also inside Westminster for drawing package purposes. |
| SW1A | Whitehall / Buckingham Palace | mixed stock | Adjoining district to SW1P, also inside Westminster for drawing package purposes. |
| SW1E | Victoria | Regency terraces, post-war flats | Adjoining district to SW1P, also inside Westminster for drawing package purposes. |
| SW1H | St James's Park | mixed stock | Adjoining district to SW1P, also inside Westminster for drawing package purposes. |
Roof pitch, wall build-up and plot depth change every few SW1P streets, and each one changes what a drawing package can achieve at that address.
How designation changes a SW1P (Westminster / Vincent Square) drawing package: Westminster City Council maintains 56 conservation areas, including Belgravia, Marylebone, Pimlico. Inside any of them a SW1P (Westminster / Vincent Square) drawing package 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. St John's Wood sets the tone for SW1P (Westminster / Vincent Square) casework.
SW1P (Westminster / Vincent Square) and Article 4: Multiple Article 4 Directions — office-to-residential restrictions, HMO conversions, retail to residential in shopping zones. A drawing package planned at a SW1P address is checked against that direction first; Westminster City Council publishes the SW1P (Westminster / Vincent Square) extent, and the SW1P line rarely follows the SW1P (Westminster / Vincent Square) boundary you would expect.
Digging below a SW1P (Westminster / Vincent Square) property: Westminster basement policy restricts to single-storey, typically under 50% of rear garden footprint; lightwells and rooflights strictly controlled in conservation areas. Where a drawing package in SW1P (Westminster / Vincent Square) involves excavation that is read beside the Party Wall etc. Act 1996, which needs two months notice for a SW1P (Westminster / Vincent Square) dig within 3 m of a neighbour, and Westminster City Council expects the SW1P ground conditions addressed in the application.
What SW1P (Westminster / Vincent Square) is built from: Grand Georgian and Regency terraces in Belgravia and Pimlico; Victorian and Edwardian mansion blocks; heritage-rich townhouses throughout; very high listed building density. Heritage-first planning approach; listed buildings on almost every street; basement and rear extension policies particularly strict. That mix decides the drawing package route in SW1P (Westminster / Vincent Square) more than the postcode does, and it is what a Westminster City Council case officer reads first. A householder application costs £548 paid to Westminster City Council direct, with 8 weeks to a decision once validated.
Sources for this SW1P 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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