Lewisham · SE23

Gas safety certificate in SE23 (Forest Hill)? We'll point you the right way.

Covering Forest Hill, Honor Oak, Crofton Park, including Dulwich Hill, Dulwich Wood, Peckham Rye. Find Gas Safe registered engineers nearby.

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Request a gas safety certificate in SE23 (Forest Hill)

No gas safety engineer listed for SE23 (Forest Hill) yet. Tell us what you need and we'll find you a registered gas safety engineer, free.

Request a gas safety certificate in SE23 (Forest Hill)

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

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SE23 (Forest Hill) in a nutshell

SE23 covers Forest Hill, Honor Oak, Crofton Park, in Lewisham and Southwark. Give your full postcode when you ask for quotes, so the pro can confirm they cover your street.

Local tips for SE23

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Two councils in one district

SE23 is split between Lewisham and Southwark. 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

SE23 stretches across Crofton Park, Dulwich Hill, Dulwich Wood and more, so give your full postcode, not just 'SE23', when you ask for quotes.

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

Lots of old SE23 postcodes have been retired. If an old letter shows a different postcode, use your current one.

Where's this from?Doogal/ONSPD: 625 of 1,082 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 Lewisham page. Always double-check on GOV.UK.

Next door to SE23

SE26 · SydenhamSE6 · BellinghamSE20 · AnerleySE4 · BrockleySE22 · East DulwichSE21 · Dulwich

← Gas safety (CP12) across Lewisham · all areas

Frequently asked questions

Which areas does SE23 cover?

SE23 (Forest Hill, Honor Oak, Crofton Park) includes the wards of Crofton Park, Dulwich Hill, Dulwich Wood, Forest Hill, Peckham Rye, Perry Vale (ONS Postcode Directory via postcodes.io).

Which postcode districts are next to SE23?

Neighbouring districts include SE26 (Sydenham), SE6 (Bellingham), SE20 (Anerley), SE4 (Brockley), SE22 (East Dulwich) (ONS Postcode Directory via Doogal). A pro covering SE23 may well cover these too, so it's worth asking.

How many homes are in SE23?

About 14,632 households and 33,687 residents at the 2011 Census, across 625 active postcodes (Doogal / ONS Postcode Directory).

Which council area is SE23 in?

SE23 sits in Lewisham, Southwark (postcodes.io). Parliamentary constituency: Dulwich and West Norwood, Lewisham West and East Dulwich.

📊 The numbers behind this page
Postcode district
SE23 1
Areas covered
Forest Hill, Honor Oak, Crofton Park 2
Active postcodes
625 3
Households (2011 Census, via Doogal)
14,632 2
Population (2011 Census, via Doogal)
33,687 2
Electoral wards
Crofton Park, Dulwich Hill, Dulwich Wood, Forest Hill, Peckham Rye, Perry Vale 4
Parliamentary constituencies
Dulwich and West Norwood, Lewisham West and East Dulwich 4
Local authority
Lewisham, Southwark 4
Households heated by mains gas only (Lewisham built-up area)
71.5% 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.