Pre-set example. Adjust the size below to recalculate.
Estimate uses Westminster City Council build-cost premium and typical full design + planning + regs ranges for Westminster.
Pick a slot that suits you. No obligation and no sales pressure, just straight answers on your planning route.



Every Westminster postcode district we draw in, the stock that dominates it and the authority that validates a full project cost package there. Westminster fees below are the statutory England rates for 2026, not full project cost package estimates.
| Postcode | Area | Dominant stock | What it means for a full project cost package |
|---|---|---|---|
| W1F | Soho | Georgian terraces, mixed-use | W1F covers Soho only; Westminster City Council handles the full project cost package. |
| W1G | Harley Street / Marylebone | Georgian terraces, Edwardian mansion blocks | A full project cost package at an W1G address in Harley Street / Marylebone is determined by Westminster City Council under its own Local Plan policies for Harley Street / Marylebone. |
| W1H | Marylebone | Georgian terraces, Edwardian mansion blocks | W1H covers Marylebone only; Westminster City Council handles the full project cost package. |
| W1J | Mayfair | Georgian townhouses, listed buildings | A full project cost package at an W1J address in Mayfair is determined by Westminster City Council under its own Local Plan policies for Mayfair. |
| W1S | Mayfair / Hanover Square | Grand Georgian and Regency terraces in Belgravia and Pimlico; Victorian and Edwardian mansion blocks; heritage-rich townhouses throughout; very high listed building density | W1S covers Mayfair / Hanover Square only; Westminster City Council handles the full project cost package. |
| W1W | Fitzrovia / Great Portland Street | Grand Georgian and Regency terraces in Belgravia and Pimlico; Victorian and Edwardian mansion blocks; heritage-rich townhouses throughout; very high listed building density | W1W covers Fitzrovia / Great Portland Street only; Westminster City Council handles the full project cost package. |
Roof pitch, wall build-up and plot depth change every few Westminster streets, and each one changes what a full project cost package can achieve at that address.
How designation changes a Westminster full project cost package: Westminster City Council maintains 56 conservation areas, including Marylebone, Pimlico, Soho. Inside any of them a Westminster full project cost 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. Covent Garden sets the tone for Westminster casework.
What Article 4 removes near Westminster: Multiple Article 4 Directions — office-to-residential restrictions, HMO conversions, retail to residential in shopping zones. Before pricing a full project cost package we check whether the NW8 address is inside the mapped area, because Westminster City Council draws the Westminster boundary street by street rather than across the whole of Westminster.
Digging below a Westminster 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 full project cost package in Westminster involves excavation that is read beside the Party Wall etc. Act 1996, which needs two months notice for a Westminster dig within 3 m of a neighbour, and Westminster City Council expects the NW8 ground conditions addressed in the application.
The building fabric around Westminster: 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. A full project cost package in Westminster is scoped against that stock first.
Sources for this Westminster full project cost 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.
