St Albans · AL4
Gas safety certificate in AL4 (St Albans)? We'll point you the right way.
Covering St Albans, Colney Heath, London Colney, Jersey Farm, Marshalswick, Oaklands, Sandridge, Smallford, Tyttenhanger, Wheathampstead, including Codicote & Kimpton, Cunningham, Hatfield Villages. Find Gas Safe registered engineers nearby.
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Request a gas safety certificate in AL4 (St Albans)
How to check a gas safety engineer is registered: see the St Albans page.
AL4 (St Albans) in a nutshell
AL4 covers St Albans, Colney Heath, London Colney, Jersey Farm, Marshalswick, Oaklands, Sandridge, Smallford, Tyttenhanger, Wheathampstead, in Hertsmere and North Hertfordshire and St Albans and Welwyn Hatfield. Give your full postcode when you ask for quotes, so the pro can confirm they cover your street.
Local tips for AL4
Two councils in one district
AL4 is split between Hertsmere and North Hertfordshire and St Albans and Welwyn Hatfield. Some councils run their own landlord licensing, so check which one your home is in.
Where's this from?
postcodes.io (ONSPD) local authorityGive your full postcode
AL4 stretches across Codicote & Kimpton, Colney Heath, Cunningham and more, so give your full postcode, not just 'AL4', when you ask for quotes.
Where's this from?
postcodes.io (ONSPD) wardsMostly mains gas round here
Most homes in St Albans run on mains gas, so a standard boiler-and-hob check is what most people need.
Where's this from?
ONS Census 2021, St Albans: 80.1% mains gas onlyEngland 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 St Albans page. Always double-check on GOV.UK.
Next door to AL4
Frequently asked questions
Which areas does AL4 cover?
AL4 (St Albans, Colney Heath, London Colney, Jersey Farm, Marshalswick, Oaklands, Sandridge, Smallford, Tyttenhanger, Wheathampstead) includes the wards of Codicote & Kimpton, Colney Heath, Cunningham, Hatfield Villages, Hill End, London Colney, Marshalswick East & Jersey Farm, Marshalswick West, Sandridge & Wheathampstead, Shenley, Welham Green and Hatfield South (ONS Postcode Directory via postcodes.io).
Which postcode districts are next to AL4?
Neighbouring districts include AL1 (St Albans), AL3 (St Albans), AL10 (Hatfield), AL2 (St Albans), AL5 (Harpenden) (ONS Postcode Directory via Doogal). A pro covering AL4 may well cover these too, so it's worth asking.
How many homes are in AL4?
About 10,792 households and 27,221 residents at the 2011 Census, across 787 active postcodes (Doogal / ONS Postcode Directory).
Which council area is AL4 in?
AL4 sits in Hertsmere, North Hertfordshire, St Albans, Welwyn Hatfield (postcodes.io). Parliamentary constituency: Harpenden and Berkhamsted, Hertsmere, Hitchin, St Albans, Welwyn Hatfield.
📊 The numbers behind this page
- Postcode district
- AL4 1
- Areas covered
- St Albans, Colney Heath, London Colney, Jersey Farm, Marshalswick, Oaklands, Sandridge, Smallford, Tyttenhanger, Wheathampstead 2
- Active postcodes
- 787 3
- Households (2011 Census, via Doogal)
- 10,792 2
- Population (2011 Census, via Doogal)
- 27,221 2
- Electoral wards
- Codicote & Kimpton, Colney Heath, Cunningham, Hatfield Villages, Hill End, London Colney, Marshalswick East & Jersey Farm, Marshalswick West … 4
- Parliamentary constituencies
- Harpenden and Berkhamsted, Hertsmere, Hitchin, St Albans, Welwyn Hatfield 4
- Local authority
- Hertsmere, North Hertfordshire, St Albans, Welwyn Hatfield 4
- Households heated by mains gas only (St Albans built-up area)
- 80.1% 5
- ONS Postcode Directory
- Doogal
- Doogal / ONSPD
- postcodes.io
- ONS Census 2021
Made with open data. See where it all comes from. Updated 26 October 2026.