Greater London • SW1 postcode area
Westminster (SW1) site snapshot
A planning-aware snapshot of the SW1 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
Royal residences, Whitehall, government, embassies. Highly heritage-sensitive.
Flood risk
Thames flood zone 3 along Embankment and Pimlico. Thames Barrier protected.
Heritage
Westminster Abbey, Houses of Parliament, Buckingham Palace WHS. Multiple conservation areas.
Transport
Westminster, St James's Park, Victoria, Pimlico, Westminster underground. PTAL 6b.
Market context
Highest land values in UK, very high heritage and political scrutiny.
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 The 2021 City Plan was superseded on 21 January 2026.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 SW1?
Thames flood zone 3 along Embankment and Pimlico. Thames Barrier protected.
Which planning authority covers SW1?
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 SW1
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.