Greater London • W1 postcode area
Mayfair and Marylebone (W1) site snapshot
A planning-aware snapshot of the W1 postcode area in London. Use it to frame address-specific questions; conditions and authority boundaries can vary within the area.
Use this overview to plan your research. Verify current requirements and site-specific conditions against the relevant primary sources. Read our data sources, coverage and limits guide.
Character
Luxury retail, Mayfair grand townhouses, Marylebone village.
Flood risk
Low. Surface water pockets only.
Heritage
Mayfair, Marylebone, Soho conservation areas.
Transport
Bond Street, Marble Arch, Oxford Circus, Marylebone, Piccadilly.
Market context
Highest residential and retail values in UK.
Planning authority
This area guide references Westminster City Council. Confirm the responsible authority for the exact site address. The 2021 City Plan was superseded on 21 January 2026. The development plan also includes the London Plan and any applicable made neighbourhood plan.
Questions
What is the flood risk in W1?
Low. Surface water pockets only.
Which planning authority covers W1?
This guide references Westminster City Council. Confirm the authority using the exact site address; a postcode area is not an authority boundary.
Check a site in W1
Check available flood information for the site address and inspect the source coverage before drawing a conclusion.
Check flood riskReview current plans and usage and source coverage for your project.