Hatfield · AL9
Gas safety certificate in AL9 (Hatfield)? We'll point you the right way.
Covering Hatfield, Brookmans Park, Essendon, North Mymms, including Brookmans Park and Little Heath, Hatfield Central, Hatfield East. Find Gas Safe registered engineers nearby.
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Request a gas safety certificate in AL9 (Hatfield)
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Request a gas safety certificate in AL9 (Hatfield)
How to check a gas safety engineer is registered: see the Hatfield page.
AL9 (Hatfield) in a nutshell
AL9 covers Hatfield, Brookmans Park, Essendon, North Mymms, in East Hertfordshire and Welwyn Hatfield. Give your full postcode when you ask for quotes, so the pro can confirm they cover your street.
Local tips for AL9
Two councils in one district
AL9 is split between East Hertfordshire 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
AL9 stretches across Brookmans Park and Little Heath, Hatfield Central, Hatfield East and more, so give your full postcode, not just 'AL9', when you ask for quotes.
Where's this from?
postcodes.io (ONSPD) wardsMostly mains gas round here
Most homes in Hatfield run on mains gas, so a standard boiler-and-hob check is what most people need.
Where's this from?
ONS Census 2021, Hatfield: 76.6% 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 Hatfield page. Always double-check on GOV.UK.
Next door to AL9
Frequently asked questions
Which areas does AL9 cover?
AL9 (Hatfield, Brookmans Park, Essendon, North Mymms) includes the wards of Brookmans Park and Little Heath, Hatfield Central, Hatfield East, Hertford Rural, Welham Green and Hatfield South (ONS Postcode Directory via postcodes.io).
Which postcode districts are next to AL9?
Neighbouring districts include AL10 (Hatfield), AL7 (Welwyn Garden City), AL8 (Welwyn Garden City), EN6 (Potters Bar), AL6 (Welwyn) (ONS Postcode Directory via Doogal). A pro covering AL9 may well cover these too, so it's worth asking.
How many homes are in AL9?
About 4,342 households and 10,641 residents at the 2011 Census, across 429 active postcodes (Doogal / ONS Postcode Directory).
Which council area is AL9 in?
AL9 sits in East Hertfordshire, Welwyn Hatfield (postcodes.io). Parliamentary constituency: North East Hertfordshire, Welwyn Hatfield.
📊 The numbers behind this page
- Postcode district
- AL9 1
- Areas covered
- Hatfield, Brookmans Park, Essendon, North Mymms 2
- Active postcodes
- 429 3
- Households (2011 Census, via Doogal)
- 4,342 2
- Population (2011 Census, via Doogal)
- 10,641 2
- Electoral wards
- Brookmans Park and Little Heath, Hatfield Central, Hatfield East, Hertford Rural, Welham Green and Hatfield South 4
- Parliamentary constituencies
- North East Hertfordshire, Welwyn Hatfield 4
- Local authority
- East Hertfordshire, Welwyn Hatfield 4
- Households heated by mains gas only (Hatfield built-up area)
- 76.6% 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.