Barnet Landlord CP12 Certificates: A Plain-English Guide
Everything Barnet landlords need to know about the CP12 in 2026 — legal duties, real costs, deadlines and how to stay compliant without stress.
If you let property in Barnet or anywhere across North London, the rules are unambiguous: every gas appliance in the home needs to be inspected by a Gas Safe registered engineer every twelve months, and the tenant needs a copy of the resulting certificate — the CP12, or Landlord Gas Safety Record.
What gets checked
A proper inspection covers every gas appliance in your name — boiler, gas hob, gas fire, plus any flue that serves them. We test for gas tightness, burner pressure, ventilation, flue performance and combustion. Anything that fails gets flagged as ID (Immediately Dangerous) or AR (At Risk) and either isolated or repaired before the certificate is issued.
Real Barnet pricing
For a typical Barnet flat with a single boiler and a gas hob, a standalone CP12 runs £75–£95. Bundling it with a boiler service on the same visit brings the combined price down to around £130 — most landlords go this route because it discharges both duties in one appointment.
The two-month rule
A CP12 can be renewed up to two months before its expiry date without losing any of the original twelve-month window. We diary-manage every Barnet landlord on our books and prompt you 60 days out from renewal, so a deadline never gets missed by accident.
What happens if you don't
Letting a property without a valid CP12 carries fines of up to £6,000 per appliance, and in serious cases unlimited fines and even imprisonment. Insurance is also void, so a single gas incident could leave you personally on the hook. It's a risk that simply doesn't need taking.
Portfolio landlords
Running five or more units across North London? We offer bespoke portfolio pricing that includes digital certificates, direct-to-tenant delivery and a single monthly invoice. Many of our agency partners around EN4, EN5 and N20 layer a heating maintenance plan on top so repairs come pre-priced and out-of-hours cover is baked in. If a broader property upgrade is in the works, Norvex Plumbing handles the plumbing and bathroom side of the portfolio.
Booking your CP12
We book Barnet landlord checks across weekdays, weekends and evenings so tenant schedules aren't an obstacle. The visit itself usually takes 45 minutes and the digital certificate lands in your inbox the same day.