City of Westminster · W1K

Plumbing compliance check in W1K (Mayfair – north)? We'll point you the right way.

Covering Mayfair – north, Grosvenor Square, including Hyde Park, West End. Find plumbers nearby.

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Request a plumbing compliance check in W1K (Mayfair – north)

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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

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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 authority
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Give 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) wards
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Converted flats and bedsits

Converted houses often share pipework between flats, so a leak upstairs can become your problem. Know where your stopcock is!

Where's this from?ONS Census 2021, City of Westminster: 16.0% converted/shared houses
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New to plumbing compliance checks? Here's what to expect, how to get ready and what it costs, in plain English. Read the quick guide →

England landlord rules: quick version

  • No single certificate: but keep water, heating and sanitation in repair.
  • Legionella: assess the risk for each let.
  • CO alarms: needed where there's a fixed combustion appliance (not gas cookers).

More detail on the City of Westminster page. Always double-check on GOV.UK.

Next door to W1K

W1C · Oxford Street – westW1S · Hanover SquareW1J · Mayfair – southW1U · MaryleboneW1G · Harley StreetW1B · Portland Street

← Plumbing & water compliance across City of Westminster · all areas

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 in converted/shared houses (City of Westminster built-up area)
16.0% 5
  1. ONS Postcode Directory
  2. Doogal
  3. Doogal / ONSPD
  4. postcodes.io
  5. ONS Census 2021

Made with open data. See where it all comes from. Updated 26 October 2026.