City of Westminster · W1B

Gas safety certificate in W1B (Portland Street)? We'll point you the right way.

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

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Request a gas safety certificate in W1B (Portland Street)

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Request a gas safety certificate in W1B (Portland Street)

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

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W1B (Portland Street) in a nutshell

W1B covers Portland Street, Regent Street, in Westminster. Give your full postcode when you ask for quotes, so the pro can confirm they cover your street.

Local tips for W1B

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Westminster council area

W1B 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

W1B stretches across Marylebone, West End, so give your full postcode, not just 'W1B', when you ask for quotes.

Where's this from?postcodes.io (ONSPD) wards
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Postcodes change here

Lots of old W1B postcodes have been retired. If an old letter shows a different postcode, use your current one.

Where's this from?Doogal/ONSPD: 297 of 545 postcodes active
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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 W1B

W1S · Hanover SquareW1F · Soho – north westW1W · Great Portland StreetW1D · Soho – south eastW1C · Oxford Street – west

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

Frequently asked questions

Which areas does W1B cover?

W1B (Portland Street, Regent Street) includes the wards of Marylebone, West End (ONS Postcode Directory via postcodes.io).

Which postcode districts are next to W1B?

Neighbouring districts include W1S (Hanover Square), W1F (Soho – north west), W1W (Great Portland Street) (ONS Postcode Directory via Doogal). A pro covering W1B may well cover these too, so it's worth asking.

How many homes are in W1B?

About 300 households and 549 residents at the 2011 Census, across 297 active postcodes (Doogal / ONS Postcode Directory).

Which council area is W1B in?

W1B sits in Westminster (postcodes.io). Parliamentary constituency: Cities of London and Westminster.

📊 The numbers behind this page
Postcode district
W1B 1
Areas covered
Portland Street, Regent Street 2
Active postcodes
297 3
Households (2011 Census, via Doogal)
300 2
Population (2011 Census, via Doogal)
549 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.