City of Westminster · W1U

Gas safety certificate in W1U (Marylebone)? We'll point you the right way.

Covering Marylebone, including West End. Find Gas Safe registered engineers nearby.

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Request a gas safety certificate in W1U (Marylebone)

No gas safety engineer listed for W1U (Marylebone) yet. Tell us what you need and we'll find you a registered gas safety engineer, free.

Request a gas safety certificate in W1U (Marylebone)

How to check a gas safety engineer is registered: see the City of Westminster page.

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W1U (Marylebone) in a nutshell

W1U covers Marylebone, in Westminster. Give your full postcode when you ask for quotes, so the pro can confirm they cover your street.

Local tips for W1U

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Westminster council area

W1U 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

W1U stretches across Marylebone, West End, so give your full postcode, not just 'W1U', when you ask for quotes.

Where's this from?postcodes.io (ONSPD) wards
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Mostly 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 only
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New to gas safety certificates? 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

  • 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 W1U

W1G · Harley StreetW1H · MaryleboneW1C · Oxford Street – westW1K · Mayfair – northW1W · Great Portland StreetW1B · Portland Street

← Gas safety (CP12) across City of Westminster · all areas

Frequently asked questions

Which areas does W1U cover?

W1U (Marylebone) includes the wards of Marylebone, West End (ONS Postcode Directory via postcodes.io).

Which postcode districts are next to W1U?

Neighbouring districts include W1G (Harley Street), W1H (Marylebone), W1C (Oxford Street – west) (ONS Postcode Directory via Doogal). A pro covering W1U may well cover these too, so it's worth asking.

How many homes are in W1U?

About 2,939 households and 5,261 residents at the 2011 Census, across 1,070 active postcodes (Doogal / ONS Postcode Directory).

Which council area is W1U in?

W1U sits in Westminster (postcodes.io). Parliamentary constituency: Cities of London and Westminster.

📊 The numbers behind this page
Postcode district
W1U 1
Areas covered
Marylebone 2
Active postcodes
1,070 3
Households (2011 Census, via Doogal)
2,939 2
Population (2011 Census, via Doogal)
5,261 2
Electoral wards
Marylebone, 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
  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.