Areas / Westminster / SW1P
Architects in SW1P
Westminster, Smith Square and the north of Pimlico. Mostly flats in listed buildings and mansion blocks.
RIBA Chartered Practice · ARB-registered architects · Extensions, lofts and planning drawings
Planning authority
Which council decides in SW1P?
SW1P is split between 2 councils, so the council that decides your application depends on your street. 744 postcodes, 6 miles from our studio.
| Council | Share of SW1P postcodes |
|---|---|
| Westminster | 63% (472) |
| Wandsworth | 37% (272) |
By postcode sector
| Sector | Postcodes | Council |
|---|---|---|
| SW1P 1 | 140 | Westminster (mostly; some streets in another council) |
| SW1P 2 | 146 | Westminster (mostly; some streets in another council) |
| SW1P 3 | 96 | Westminster (mostly; some streets in another council) |
| SW1P 4 | 160 | Westminster (mostly; some streets in another council) |
| SW1P 9 | 202 | Wandsworth |
Postcode checker
Check your exact postcode
Type any postcode in the 33 London boroughs we cover. We'll tell you which council handles planning there and show you the local planning points.
Local planning points
If your home is in Westminster
There are 56 conservation areas in Westminster.
SourceThe City Plan 2019-2040 (2026) was adopted on 21 January 2026 after a partial review, replacing the 2021 version; work on a full new City Plan began in 2026.
SourceThe 2026 City Plan brings in a retrofit-first approach before demolition, and for the first time developments of fewer than 10 homes must contribute to affordable housing.
Source
Local planning points
If your home is in Wandsworth
The Wandsworth Local Plan was adopted on 19 July 2023 and is the main policy document for planning applications in the borough.
SourceRear extensions should be subservient to the original house, and two-storey extensions directly on the boundary with a neighbour should be avoided (Housing SPD, 2016). The SPD predates the 2023 Local Plan, so it is used as guidance alongside the newer policies.
SourceMulti-level basements are not considered appropriate in Wandsworth, and the council's guide treats keeping at least half the depth of the back garden as good practice (Basements: a Householder Guide).
Source
Services
What we draw in SW1P
- House extensions
- Loft conversions
- Basement conversions
- Planning permission
- Building regulations drawings
- Structural calculations
- Flat conversions
- Change of use
- New builds
- Interior design
Nearby postcode districts: SW1V, SW1W, SW1X, SW3, SW7, SW10.