Harrow · HA1

Gas safety certificate in HA1 (Harrow)? We'll point you the right way.

Covering Harrow, North Harrow, Northwick Park, including Greenhill, Harrow on the Hill, Headstone. Find Gas Safe registered engineers nearby.

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Request a gas safety certificate in HA1 (Harrow)

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Request a gas safety certificate in HA1 (Harrow)

How to check a gas safety engineer is registered: see the Harrow page.

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HA1 (Harrow) in a nutshell

HA1 covers Harrow, North Harrow, Northwick Park, in Brent and Harrow. Give your full postcode when you ask for quotes, so the pro can confirm they cover your street.

Local tips for HA1

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Two councils in one district

HA1 is split between Brent and Harrow. Some councils run their own landlord licensing, so check which one your home is in.

Where's this from?postcodes.io (ONSPD) local authority
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Give your full postcode

HA1 stretches across Greenhill, Harrow on the Hill, Headstone and more, so give your full postcode, not just 'HA1', when you ask for quotes.

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

Lots of old HA1 postcodes have been retired. If an old letter shows a different postcode, use your current one.

Where's this from?Doogal/ONSPD: 960 of 1,796 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 Harrow page. Always double-check on GOV.UK.

Next door to HA1

HA3 · Harrow WealdHA2 · North HarrowUB6 · GreenfordHA7 · StanmoreHA5 · PinnerHA0 · Alperton

← Gas safety (CP12) across Harrow · all areas

Frequently asked questions

Which areas does HA1 cover?

HA1 (Harrow, North Harrow, Northwick Park) includes the wards of Greenhill, Harrow on the Hill, Headstone, Marlborough, North Harrow, Northwick Park, West Harrow (ONS Postcode Directory via postcodes.io).

Which postcode districts are next to HA1?

Neighbouring districts include HA3 (Harrow Weald), HA2 (North Harrow), UB6 (Greenford), HA7 (Stanmore), HA5 (Pinner) (ONS Postcode Directory via Doogal). A pro covering HA1 may well cover these too, so it's worth asking.

How many homes are in HA1?

About 14,194 households and 38,479 residents at the 2011 Census, across 960 active postcodes (Doogal / ONS Postcode Directory).

Which council area is HA1 in?

HA1 sits in Brent, Harrow (postcodes.io). Parliamentary constituency: Brent West, Harrow West.

📊 The numbers behind this page
Postcode district
HA1 1
Areas covered
Harrow, North Harrow, Northwick Park 2
Active postcodes
960 3
Households (2011 Census, via Doogal)
14,194 2
Population (2011 Census, via Doogal)
38,479 2
Electoral wards
Greenhill, Harrow on the Hill, Headstone, Marlborough, North Harrow, Northwick Park, West Harrow 4
Parliamentary constituencies
Brent West, Harrow West 4
Local authority
Brent, Harrow 4
Households heated by mains gas only (Harrow built-up area)
78.3% 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.