Landlord CP12
Gas Safety Certificates —
Issued On The Day.
A legally-required annual inspection of every gas appliance in your let property, carried out by a Gas Safe registered engineer and issued as a signed CP12 (Landlord Gas Safety Record). We cover single lets, HMOs, blocks and letting-agent portfolios across London — with digital certificates emailed the same day where possible.
What a CP12 is — and what happens without one.
A CP12 (formerly Corgi Proforma 12, now called a Landlord Gas Safety Record) is a legally required annual certificate under the Gas Safety (Installation and Use) Regulations 1998. It confirms every gas appliance, pipe and flue in a let property has been inspected by a Gas Safe registered engineer and is safe to use. It has to be issued to the tenant within 28 days of the check, and to new tenants before they move in.
Chelsea Plumbing & Heating Co. issues CP12s across London and the Home Counties for private landlords, letting agents managing portfolios, and HMO operators. Every certificate is signed and Gas Safe-registered by Ian Fisher (Reg. 952303) and emailed as a digital PDF on completion — no waiting for post.
You need a CP12 every 12 months, on every gas appliance in every property you let. That includes the boiler, gas hobs, gas ovens, gas fires and any gas-fired water heaters. It's separate from EICR (electrical), EPC (energy) and smoke/CO alarm compliance — but all four typically get bundled at renewal time.
It's also worth stating clearly: a CP12 is a safety check, not a service. It confirms appliances are safe today. It does not maintain the boiler for another year — that is what an annual service does. Sensible landlords book both on the same visit, particularly on properties with high-turnover tenancies.
The real cost of an out-of-date CP12.
Letting a property without a valid CP12 is a criminal offence under the Gas Safety (Installation and Use) Regulations. On summary conviction the fine can run to £6,000 per offence per appliance — and courts have handed down custodial sentences where non-compliance has contributed to injury or death.
Beyond the fine, an expired CP12 blocks you from serving a valid Section 21 no-fault possession notice in England. If you haven't given the current tenant a copy of a valid CP12 before they moved in and on renewal, your S21 can be ruled invalid — and you lose months on a possession claim.
The letting-agent-facing consequence is that most managed portfolios simply won't renew tenancies without an in-date CP12 on file, and buildings insurance may be voided if a gas incident occurs during a period when the certificate had lapsed.
- ×Assuming a boiler service counts as a CP12 — it doesn't; they are separate documents.
- ×Only certifying the boiler — a CP12 must cover every gas appliance in the property, including hobs, ovens and fires.
- ×Booking with a fitter who is 'CORGI registered' — CORGI was replaced by Gas Safe in 2009. If they're not on the Gas Safe Register, the certificate is invalid.
- ×Letting the certificate expire between tenancies and re-letting without a fresh check — a common way to invalidate a Section 21 notice.
- ×Not giving the tenant a copy within 28 days of the check, or before move-in for a new tenancy — the certificate exists but the compliance chain is broken.
- ×Losing the paper copy and not having a digital backup — we issue every CP12 as a PDF so it's always retrievable.
A methodical system,
not a rushed callout.
-
01BookSlot booked with you or your letting agent — direct access or key collection both fine.
-
02Appliance checkEvery gas appliance in the property inspected against Gas Safe safety criteria.
-
03Flue & tightness testFlue integrity checked, gas tightness test performed on the installation.
-
04Certificate issuedDigital CP12 emailed on the day (or within 24hrs) — signed, Gas Safe registered, tenant-ready.
-
05Repairs quoted (if needed)Any At-Risk or Immediately Dangerous appliances flagged in writing with a fixed price to remedy.
Concrete outcomes,
not vague promises.
Same-day PDF issue
Digital CP12 emailed on completion where possible — no waiting on post, no chasing paperwork before a tenant move-in.
All appliances covered
Boiler, hobs, ovens, gas fires, water heaters — every gas appliance in the property inspected in one visit.
Letting agent friendly
We work with letting agents across London — direct billing, portfolio scheduling and key-holder access all handled.
S21 protection
A valid CP12 is a prerequisite for a lawful Section 21 notice. Ours are legally valid and dated correctly.
Combined with service
Book a CP12 and annual boiler service on the same visit — one van, one bill, warranty stays valid.
Signed Gas Safe engineer
Every certificate signed by Ian Fisher, Gas Safe Reg. 952303 — verifiable on the Gas Safe Register.
What we inspect on a CP12 visit.
A CP12 is not a paperwork exercise. Every gas appliance and every metre of the gas installation is checked against a specific set of Gas Safe safety criteria. Here's what that actually looks like.
Gas tightness test
The full gas installation is pressure-tested against the meter to confirm there are no leaks anywhere in the pipework — the first test on every CP12.
Boiler / water heater
Combustion analyser reading, gas rate check, flue integrity and terminal position, standing pressure, working pressure, safety-device operation.
Gas cookers, hobs and ovens
Flame picture, flame stability, flame-supervision device operation, hose condition, stability chain (freestanding cookers), room ventilation adequacy.
Gas fires and decorative appliances
Flue-flow and spillage tests, catchment space, closure plate integrity, room ventilation and CO alarm presence.
Flue and ventilation
Every flue visually inspected end-to-end where accessible, spillage tested, and room ventilation confirmed against the appliance manufacturer's requirements.
Appliance safety classification
Any fault is classified as Not to Current Standards (NCS), At Risk (AR) or Immediately Dangerous (ID). ID appliances are disconnected on the spot with your consent.
HMOs and blocks
For HMOs and multi-unit blocks we coordinate access schedules with the managing agent and issue individual CP12s per unit — plus a consolidated compliance report on request.
Remedial work
Where an appliance fails, we quote the repair in writing on the day. Most single-fault remedial work can be booked in for the same week.
How much does a CP12 cost in London?
A standard CP12 on a one- or two-appliance property is typically completed within 45–60 minutes at £90/hr. Fixed-price CP12 rates are available for letting-agent portfolios — call for a portfolio quote.
How quickly can you issue a CP12?
Same-day issue is the norm where we can access the property. The certificate is emailed as a signed PDF on completion — ready to forward to your tenant.
How often do I need a CP12?
Every 12 months. The new certificate must be in place before the previous one expires, and must be given to the tenant within 28 days of the check (or before move-in for a new tenancy).
Does a CP12 cover my gas hob and oven as well as the boiler?
Yes — every gas appliance in the property must be inspected on the same certificate. Not just the boiler.
What happens if an appliance fails the check?
It's classified as NCS, AR or ID. NCS and AR come with recommendations. ID (Immediately Dangerous) appliances are disconnected with your consent on the day, and we quote the repair in writing.
Can I book on behalf of my letting agent?
Yes — we work directly with letting agents across London, take instructions from either the landlord or the agent, and issue the certificate to whichever party you specify.
Do you cover HMOs and blocks?
Yes. HMOs, purpose-built blocks and multi-unit portfolios are all covered. We coordinate access with the managing agent and issue individual per-unit CP12s.
Is a CP12 the same as a boiler service?
No. A CP12 is a safety check for legal compliance. A boiler service is a maintenance visit that keeps the manufacturer warranty valid. Most landlords book both on the same visit — cheaper and faster.
What if the tenant refuses access?
Landlords are required to make 'all reasonable attempts' to gain access. We document the attempted visit with a dated report — protecting your compliance position if you later need to demonstrate you tried.
Which areas do you cover for CP12s?
Greater London and the surrounding Home Counties — Kent, Surrey, Essex, Hertfordshire, Buckinghamshire, Berkshire, Bedfordshire, Middlesex and West Sussex.
Fixed price. Gas Safe.
12-month guarantee.
Free estimates from Ian directly — no call centre, no subcontractors, no surprise bills. One point of contact from first call to twelve-month follow-up.