Hatfield · AL9

Plumbing compliance check 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 plumbers nearby.

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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

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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 authority
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Give 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) wards
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Older terraces, older pipes

Hatfield has lots of terraced homes. In older ones, ask the plumber to look at shared supply pipes and any old tanks in the loft.

Where's this from?ONS Census 2021, Hatfield: 36.0% terraced
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New to plumbing compliance checks? 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

  • No single certificate: but keep water, heating and sanitation in repair.
  • Legionella: assess the risk for each let.
  • CO alarms: needed where there's a fixed combustion appliance (not gas cookers).

More detail on the Hatfield page. Always double-check on GOV.UK.

Next door to AL9

AL10 · HatfieldAL7 · Welwyn Garden CityAL8 · Welwyn Garden CityEN6 · Potters BarAL6 · WelwynEN5 · High Barnet

← Plumbing & water compliance across Hatfield · all areas

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 in converted/shared houses (Hatfield built-up area)
1.2% 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.