City of Westminster · W1K
Gas safety certificate in W1K (Mayfair – north)? We'll point you the right way.
Covering Mayfair – north, Grosvenor Square, including Hyde Park, West End. Find Gas Safe registered engineers nearby.
Free to use · No sign-up to search · Always check their registration before you book
Request a gas safety certificate in W1K (Mayfair – north)
No gas safety engineer listed for W1K (Mayfair – north) yet. Tell us what you need and we'll find you a registered gas safety engineer, free.
Request a gas safety certificate in W1K (Mayfair – north)
How to check a gas safety engineer is registered: see the City of Westminster page.
W1K (Mayfair – north) in a nutshell
W1K covers Mayfair – north, Grosvenor Square, in Westminster. Give your full postcode when you ask for quotes, so the pro can confirm they cover your street.
Local tips for W1K
Westminster council area
W1K is in Westminster's area. Some councils run their own landlord licensing, so it's worth checking theirs.
Where's this from?
postcodes.io (ONSPD) local authorityGive your full postcode
W1K stretches across Hyde Park, West End, so give your full postcode, not just 'W1K', when you ask for quotes.
Where's this from?
postcodes.io (ONSPD) wardsMostly mains gas round here
Most homes in City of Westminster run on mains gas, so a standard boiler-and-hob check is what most people need.
Where's this from?
ONS Census 2021, City of Westminster: 56.1% mains gas onlyEngland landlord rules: quick version
- Every year: a check by a Gas Safe registered engineer.
- Within 28 days: give your tenants a copy (new tenants get it before they move in).
- Keep it: hang on to records for at least 2 years.
More detail on the City of Westminster page. Always double-check on GOV.UK.
Next door to W1K
Frequently asked questions
Which areas does W1K cover?
W1K (Mayfair – north, Grosvenor Square) includes the wards of Hyde Park, West End (ONS Postcode Directory via postcodes.io).
Which postcode districts are next to W1K?
Neighbouring districts include W1C (Oxford Street – west), W1S (Hanover Square) (ONS Postcode Directory via Doogal). A pro covering W1K may well cover these too, so it's worth asking.
How many homes are in W1K?
About 1,617 households and 2,964 residents at the 2011 Census, across 878 active postcodes (Doogal / ONS Postcode Directory).
Which council area is W1K in?
W1K sits in Westminster (postcodes.io). Parliamentary constituency: Cities of London and Westminster.
📊 The numbers behind this page
- Postcode district
- W1K 1
- Areas covered
- Mayfair – north, Grosvenor Square 2
- Active postcodes
- 878 3
- Households (2011 Census, via Doogal)
- 1,617 2
- Population (2011 Census, via Doogal)
- 2,964 2
- Electoral wards
- Hyde Park, West End 4
- Parliamentary constituencies
- Cities of London and Westminster 4
- Local authority
- Westminster 4
- Households heated by mains gas only (City of Westminster built-up area)
- 56.1% 5
- ONS Postcode Directory
- Doogal
- Doogal / ONSPD
- postcodes.io
- ONS Census 2021
Made with open data. See where it all comes from. Updated 26 October 2026.