Guide · Gas Safety
Gas safety check vs boiler service: what's the difference?
Landlords conflate these two visits constantly, and the confusion costs money in both directions: some pay for annual services believing they're legally required, others skip the legally required check believing last month's service covered it. The two jobs share an engineer and often a visit — and almost nothing else.
Gas Safety
What exactly is the gas safety check?
The check is a pass/fail safety inspection required by law every 12 months for rental property with gas. A Gas Safe registered engineer tests the tightness of the installation, then inspects each landlord-owned appliance and flue: operating pressure, combustion performance, flame supervision, ventilation, and safe removal of combustion products. The output is the Landlord Gas Safety Record — the CP12 — listing every appliance, every result, and any defects found.
Nothing in the check is maintenance. The engineer is answering one question per appliance — is this safe to use? — not cleaning it, optimising it, or extending its life. An appliance can pass the safety check while being inefficient, noisy and on its last legs, because none of those things are safety defects.
Gas Safety
What exactly is a boiler service?
A service is preventative maintenance on one appliance: the boiler is opened up, the burner and heat exchanger inspected and cleaned as needed, seals and components checked, combustion measured and adjusted, and wear items flagged before they fail. It exists to keep the boiler efficient and reliable and to satisfy the conditions most manufacturer warranties attach.
No statute requires a landlord to service a boiler. The pressure comes from elsewhere: warranty terms that demand annual servicing by a qualified engineer, insurers who ask about maintenance after a claim, and the plain economics of a boiler failing in December. Real obligations — just not legal ones.
Gas Safety
Why are the two so often confused?
Because the same Gas Safe registered engineer typically performs both, often in the same visit, and the paperwork arrives together. Add marketing that bundles them into one 'annual gas package' and the boundary blurs. The distinction survives in the documents: the safety check produces the statutory record; the service produces a service report with no legal standing of its own.
The confusion has a dangerous direction. A landlord who skips the service loses efficiency and warranty cover — annoying, recoverable. A landlord who skips the check commits a criminal offence, invalidates their paperwork chain, and in England undermines their ability to serve a valid Section 21 notice. Only one of these mistakes has a prosecution pathway.
Gas Safety
Does a service count as the legal check?
No. However thorough the service, it doesn't produce a Landlord Gas Safety Record and doesn't discharge the duty under the Gas Safety (Installation and Use) Regulations 1998. The reverse is also true: a passed safety check says nothing about whether the boiler has been maintained to warranty standards.
The documents are the test. If you can't produce a current CP12 listing every appliance and flue with the engineer's Gas Safe registration number, you don't have gas safety compliance — whatever else you have receipts for. Keep both document types, but never let one impersonate the other.
Gas Safety
Should landlords book them together?
Usually, yes. The engineer is already on site with the boiler open to scrutiny, so the marginal cost of adding the service to the check visit is typically well below two separate callouts. One visit also halves the access negotiations with tenants — often the hardest part of gas compliance in practice.
The one caution is scheduling logic: the check must happen every 12 months regardless, and the MOT-style rule lets you renew in the two months before expiry without losing certificate time. Anchor the combined visit to the check's deadline, not the service's anniversary — the check is the one with legal consequences.
Gas Safety
What should each visit cost?
Both price on time: the check scales with appliance count (a combi-only flat sits at the bottom, a house with boiler, hob and fire higher), while a service is roughly a fixed unit of work per boiler. Combined bookings usually land meaningfully below the sum of two separate visits. Treat any figures you see quoted nationally as guidance, not a quote — property specifics decide the real number.
Watch for the two classic pricing distortions: teaser-priced checks that assume one appliance and re-price on the doorstep, and 'free service with every check' offers where the service is nominal. A transparent quote states what's included per appliance and what happens if defects are found.
Gas Safety
What records should you hold afterwards?
From the check: the CP12 itself, retained at least two years by law and ideally as an unbroken chain, with copies to existing tenants within 28 days and to new tenants before occupation. From the service: the service report and any parts invoices, filed where warranty claims can find them.
The two records answer different auditors. Councils, licensing officers and tribunals ask for the safety record; manufacturers and insurers ask for the service history. A well-run gas file holds both, dated, per property — and the renewal diary runs off the check's expiry date, because that's the clock with a penalty attached.
Need the certificate itself?
The Gas Safety Certificate (CP12) page covers cost, process and every UK area we serve.
FAQ
Related questions, answered
Is a gas safety check the same as a boiler service?
No. The safety check confirms appliances are safe to use; a service is a maintenance clean and inspection of the boiler itself. Many landlords in your area book both together because the engineer is already on site, but only the safety check is a legal requirement.
Who can carry out a gas safety check in your area?
Only an engineer on the Gas Safe Register may legally carry out landlord gas safety checks anywhere in the UK, including your area. Always ask to see the engineer's Gas Safe ID card — you can verify it on the official register.
How long must I keep gas safety records?
Keep each record for at least two years. Because defects and history can matter in disputes, many landlords keep the full chain of records for the life of the tenancy — digital copies are fine.
What if my tenant refuses access for the gas check?
You must take all reasonable steps: written requests, offering alternative dates, and keeping evidence of each attempt. You may not force entry. A documented paper trail of reasonable attempts is what the HSE expects if access is ultimately refused.
How long does a gas safety check take?
Typically around 30 to 60 minutes for a property with a boiler and one or two additional gas appliances. More appliances, or access issues, extend the visit.
What if an appliance fails the gas safety check?
The engineer records the defect and classifies how dangerous it is. Immediately dangerous appliances may be disconnected with your permission. You must have faults fixed by a Gas Safe engineer before the appliance is used again; the record itself lists the defects found.
Book it
Ready to act on this? The pillar page covers the certificate end to end, with every UK area linked: Gas Safety Certificate (CP12).