Chelmsford · CM1
Gas safety certificate in CM1 (Chelmsford)? We'll point you the right way.
Covering Chelmsford, Writtle, including Bicknacre and East and West Hanningfield, Boreham and The Leighs, Broomfield and The Walthams. Find Gas Safe registered engineers nearby.
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Request a gas safety certificate in CM1 (Chelmsford)
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Request a gas safety certificate in CM1 (Chelmsford)
How to check a gas safety engineer is registered: see the Chelmsford page.
CM1 (Chelmsford) in a nutshell
CM1 covers Chelmsford, Writtle, in Chelmsford and Uttlesford. Give your full postcode when you ask for quotes, so the pro can confirm they cover your street.
Local tips for CM1
Two councils in one district
CM1 is split between Chelmsford and Uttlesford. 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
CM1 stretches across Bicknacre and East and West Hanningfield, Boreham and The Leighs, Broomfield and The Walthams and more, so give your full postcode, not just 'CM1', when you ask for quotes.
Where's this from?
postcodes.io (ONSPD) wardsPostcodes change here
Lots of old CM1 postcodes have been retired. If an old letter shows a different postcode, use your current one.
Where's this from?
Doogal/ONSPD: 1,561 of 2,801 postcodes activeEngland 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 Chelmsford page. Always double-check on GOV.UK.
Next door to CM1
Frequently asked questions
Which areas does CM1 cover?
CM1 (Chelmsford, Writtle) includes the wards of Bicknacre and East and West Hanningfield, Boreham and The Leighs, Broomfield and The Walthams, Chelmer Village and Beaulieu Park, Chelmsford Rural West, High Easter & the Rodings, Marconi, Moulsham and Central, Patching Hall, Springfield North, St Andrews, The Lawns, Trinity, Waterhouse Farm, Writtle (ONS Postcode Directory via postcodes.io).
Which postcode districts are next to CM1?
Neighbouring districts include CM2 (Chelmsford), CM11 (Billericay – East), CM3 (Hatfield Peverel) (ONS Postcode Directory via Doogal). A pro covering CM1 may well cover these too, so it's worth asking.
How many homes are in CM1?
About 26,010 households and 62,632 residents at the 2011 Census, across 1,561 active postcodes (Doogal / ONS Postcode Directory).
Which council area is CM1 in?
CM1 sits in Chelmsford, Uttlesford (postcodes.io). Parliamentary constituency: Chelmsford, Maldon, North West Essex.
📊 The numbers behind this page
- Postcode district
- CM1 1
- Areas covered
- Chelmsford, Writtle 2
- Active postcodes
- 1,561 3
- Households (2011 Census, via Doogal)
- 26,010 2
- Population (2011 Census, via Doogal)
- 62,632 2
- Electoral wards
- Bicknacre and East and West Hanningfield, Boreham and The Leighs, Broomfield and The Walthams, Chelmer Village and Beaulieu Park, Chelmsford Rural West, High Easter & the Rodings, Marconi, Moulsham and Central … 4
- Parliamentary constituencies
- Chelmsford, Maldon, North West Essex 4
- Local authority
- Chelmsford, Uttlesford 4
- Households heated by mains gas only (Chelmsford built-up area)
- 76.7% 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.