Hillingdon · HA4

Gas safety certificate in HA4 (Ruislip)? We'll point you the right way.

Covering Ruislip, including Eastcote, Ickenham & South Harefield, Roxbourne. Find Gas Safe registered engineers nearby.

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Request a gas safety certificate in HA4 (Ruislip)

No gas safety engineer listed for HA4 (Ruislip) yet. Tell us what you need and we'll find you a registered gas safety engineer, free.

Request a gas safety certificate in HA4 (Ruislip)

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

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HA4 (Ruislip) in a nutshell

HA4 covers Ruislip, in Harrow and Hillingdon. Give your full postcode when you ask for quotes, so the pro can confirm they cover your street.

Local tips for HA4

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Two councils in one district

HA4 is split between Harrow and Hillingdon. 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

HA4 stretches across Eastcote, Ickenham & South Harefield, Roxbourne and more, so give your full postcode, not just 'HA4', 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 Hillingdon run on mains gas, so a standard boiler-and-hob check is what most people need.

Where's this from?ONS Census 2021, Hillingdon: 75.8% 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 Hillingdon page. Always double-check on GOV.UK.

Next door to HA4

HA5 · PinnerHA6 · NorthwoodUB4 · YeadingHA2 · North HarrowUB5 · NortholtUB10 · Hillingdon

← Gas safety (CP12) across Hillingdon · all areas

Frequently asked questions

Which areas does HA4 cover?

HA4 (Ruislip) includes the wards of Eastcote, Ickenham & South Harefield, Roxbourne, Roxeth, Ruislip, Ruislip Manor, South Ruislip (ONS Postcode Directory via postcodes.io).

Which postcode districts are next to HA4?

Neighbouring districts include HA5 (Pinner), HA6 (Northwood), UB4 (Yeading), HA2 (North Harrow), UB5 (Northolt) (ONS Postcode Directory via Doogal). A pro covering HA4 may well cover these too, so it's worth asking.

How many homes are in HA4?

About 19,453 households and 50,128 residents at the 2011 Census, across 1,137 active postcodes (Doogal / ONS Postcode Directory).

Which council area is HA4 in?

HA4 sits in Harrow, Hillingdon (postcodes.io). Parliamentary constituency: Harrow West, Ruislip, Northwood and Pinner, Uxbridge and South Ruislip.

📊 The numbers behind this page
Postcode district
HA4 1
Areas covered
Ruislip 2
Active postcodes
1,137 3
Households (2011 Census, via Doogal)
19,453 2
Population (2011 Census, via Doogal)
50,128 2
Electoral wards
Eastcote, Ickenham & South Harefield, Roxbourne, Roxeth, Ruislip, Ruislip Manor, South Ruislip 4
Parliamentary constituencies
Harrow West, Ruislip, Northwood and Pinner, Uxbridge and South Ruislip 4
Local authority
Harrow, Hillingdon 4
Households heated by mains gas only (Hillingdon built-up area)
75.8% 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.