Colchester · CO3

Gas safety certificate in CO3 (Colchester)? We'll point you the right way.

Covering Colchester, including Castle, Lexden and Braiswick, Marks Tey and Layer. Find Gas Safe registered engineers nearby.

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Request a gas safety certificate in CO3 (Colchester)

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Request a gas safety certificate in CO3 (Colchester)

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

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CO3 (Colchester) in a nutshell

CO3 covers Colchester, in Colchester. Give your full postcode when you ask for quotes, so the pro can confirm they cover your street.

Local tips for CO3

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Colchester council area

CO3 is in Colchester's area. Some councils run their own landlord licensing, so it's worth checking theirs.

Where's this from?postcodes.io (ONSPD) local authority
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Give your full postcode

CO3 stretches across Castle, Lexden and Braiswick, Marks Tey and Layer and more, so give your full postcode, not just 'CO3', when you ask for quotes.

Where's this from?postcodes.io (ONSPD) wards
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Postcodes change here

Lots of old CO3 postcodes have been retired. If an old letter shows a different postcode, use your current one.

Where's this from?Doogal/ONSPD: 864 of 1,458 postcodes active
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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 Colchester page. Always double-check on GOV.UK.

Next door to CO3

CO1 · ColchesterCO2 · ColchesterCO4 · ColchesterCO5 · ColchesterCO6 · ColchesterCO7 · Wivenhoe

← Gas safety (CP12) across Colchester · all areas

Frequently asked questions

Which areas does CO3 cover?

CO3 (Colchester) includes the wards of Castle, Lexden and Braiswick, Marks Tey and Layer, New Town and Christ Church, Prettygate, Shrub End, Stanway (ONS Postcode Directory via postcodes.io).

Which postcode districts are next to CO3?

Neighbouring districts include CO1 (Colchester), CO2 (Colchester), CO4 (Colchester), CO5 (Colchester), CO6 (Colchester) (ONS Postcode Directory via Doogal). A pro covering CO3 may well cover these too, so it's worth asking.

How many homes are in CO3?

About 12,063 households and 28,502 residents at the 2011 Census, across 864 active postcodes (Doogal / ONS Postcode Directory).

Which council area is CO3 in?

CO3 sits in Colchester (postcodes.io). Parliamentary constituency: Colchester, Harwich and North Essex, Witham.

📊 The numbers behind this page
Postcode district
CO3 1
Areas covered
Colchester 2
Active postcodes
864 3
Households (2011 Census, via Doogal)
12,063 2
Population (2011 Census, via Doogal)
28,502 2
Electoral wards
Castle, Lexden and Braiswick, Marks Tey and Layer, New Town and Christ Church, Prettygate, Shrub End, Stanway 4
Parliamentary constituencies
Colchester, Harwich and North Essex, Witham 4
Local authority
Colchester 4
Households heated by mains gas only (Colchester built-up area)
74.0% 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.