Planning and building regulation drawings in Mayfair (W1K)
Mayfair is Georgian London laid out on an estate. Townhouses and their mews are arranged around Grosvenor Square and Mount Street, on the Grosvenor estate, and among them stand red-brick and Portland-stone mansion blocks, embassies and high-value residential conversions. North Row and Dunraven Street are among the streets in the district. A large proportion of the buildings is listed, so for many owners the question is what can be changed without harm to something already protected.
- MCIAT chartered technologists
- Westminster City Council granted 81% of 418 householder applications
- Drawings in about 7 days
Projects follow from that: interior reworking of a townhouse, reconfiguring a flat within a converted building, adjusting a mews house, or repairing and altering elevations. Listed building consent applies to both internal and external alteration of a listed building, which brings detail into scope that would be invisible elsewhere: staircases, joinery, plasterwork and window patterns.
The Mayfair conservation area protects the grain of the townhouses and mews, together with their elevations and materials. On top of the council's permission sits the Grosvenor estate, whose freeholder consent is needed for leasehold alterations. The two processes are separate, so we like to understand both before a line is drawn. Basement work is limited by the council's subterranean-development policy, which constrains depth and the way a basement is built.
Planning in Mayfair: what to know before you apply
Westminster expects a full planning application for most Mayfair work, because the conservation area removes most permitted development and extensive statutory listing means listed building consent is often needed too. Officers look at materials, elevations and how a proposal affects the townhouse and mews grain. Basement proposals fall under the City Plan basement policy, which asks for a basement impact assessment and limits scale. Leasehold works on the Grosvenor estate need the freeholder's agreement in addition to the council's decision. No area-specific Article 4 direction is published for the district, so the combination of conservation area, listing and estate consent decides what is achievable. We resolve those layers before drawing.
Applications are decided by Westminster City Council — its planning pages.
Does your Mayfair project need planning permission?
Mayfair (W1K) in numbers
What Westminster City Council has decided, and what W1K is built of — the two facts that shape every job here.
Householder planning decisions — Westminster City Council
Mayfair (W1K) applications are decided by Westminster City Council; these are its published householder figures for the last four quarters.
| Householder applications decided2025 Q2 to 2026 Q1 | 418 |
|---|---|
| Granted | 340 |
| Refused | 78 |
| Grantedof 418 decisions · England 90% | 81% |
| Decided within 8 weeksof 230, excluding prior approvals | 79% |
Source: Ministry of Housing, Communities and Local Government (PS2 district planning application statistics). Open Government Licence v3.0 Extracted 2026-09-22.
Permitted development prior approvals — Westminster City Council
How the larger-home-extension route has fared with Westminster City Council, which decides W1K notifications.
| Larger home extension prior approvals — not required2024 Q2 to 2026 Q1 | 0 |
|---|---|
| Prior approval granted | 0 |
| Prior approval refused | 0 |
Source: Ministry of Housing, Communities and Local Government (PS1 district planning application statistics). Open Government Licence v3.0 Extracted 2026-09-22.
Planning appeals — Westminster City Council
Refusals in W1K can be appealed to the Planning Inspectorate; this is Westminster City Council's householder appeal record.
| Householder appeals determined2021–2026 | 124 |
|---|---|
| Allowed | 44 |
| Allowedof 124 · England 36% | 35% |
Source: Planning Inspectorate appeals casework. Open Government Licence v3.0 Extracted 2026-09-22.
Conservation areas and Article 4 directions — Westminster City Council
Register counts for Westminster City Council. A count describes what the council has published, never a rank against another council.
| Conservation areas in the register56 dated, 2008–2010 | 56 |
|---|---|
| Article 4 directions in the register | 10 |
| Areas covered by an Article 4 direction | 10 |
Source: MHCLG Planning Data Platform. Open Government Licence v3.0 Extracted 2026-09-22.
What W1K is built of
Residential building form across Mayfair (W1K), from 158 classified buildings — the fact that decides party walls, side returns and loft headroom before any policy does.
| Attached on more than one side | 93% |
|---|---|
| Attached on one side | 6% |
| Detached | 1% |
| Median building footprint | 129 m² |
| Addresses per buildingAbove about 2 means flats and maisonettes dominate | 3.84 |
| Buildings classified | 158 |
Source: Ordnance Survey National Geographic Database (derived statistics). Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Extracted 2026-09-22.
- Day 0Measured survey of your Mayfair property — or your existing plans if you have them.
- About 7 daysDrawings issued for your approval. Free redraws until you are happy.
- SubmissionWe validate against Westminster City Council’s checklist and submit on your behalf.
- Council: 8-week targetHouseholder applications carry an 8-week statutory target. Westminster City Council decided 79% of 230 recent householder applications inside it.
Source: Ministry of Housing, Communities and Local Government (PS2 district planning application statistics). Open Government Licence v3.0 Extracted 2026-09-22.
Streets and neighbourhoods in W1K
Nearby postcode districts
Mayfair (W1K) — FAQs
Do I need two sets of consent for work on a Mayfair townhouse?+
Can I alter the inside of a listed Mayfair building without applying?+
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