Instant
01 · Ask
Ask the AI a follow-up
Got more questions about landlord Gas Safety Certificate (CP12)? Describe the bit you're unsure about — the AI explains options, sequencing and what to ask the boiler engineer.
Book your landlord gas safety check.
Annual CP12 inspection — required by law for all rented properties with gas appliances.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
20,000+UK homeowners
50,000Quotes sent
Keep going
Hire a boiler engineer. Without the warranty void.
You've read the brief on landlord Gas Safety Certificate (CP12). Now lean on us to find the right boiler engineer — and stay in control of the job.
Free
02 · Read the brief
Walk in informed
Costs, timelines, pitfalls and the right questions to ask before any boiler engineer starts on landlord Gas Safety Certificate (CP12).
60 seconds
03 · Compare
Compare 3 boiler engineer quotes
Itemised quotes from up to 3 local boiler engineers on landlord Gas Safety Certificate (CP12) — so you can compare like-for-like, not lump sums.
✦
Get boiler engineer quotes Ready when you are
Enter your postcode and get free quotes from local pros.
Top tips
Hiring a boiler engineer, without the regret.
Four moves that separate a smooth job from a nightmare.
Missing annual deadline
— illegal even by one day.
Forgetting to issue tenant
— must give within 28 days of inspection.
Faulty appliance discovered
— repair required before certificate issued.
Tenant refuses access
— document attempts; legal advice for persistent refusal.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
1 gas appliance (boiler only)Most common
£80–£120
2 appliances (boiler + cooker)Standard family rental
£90–£150
3+ appliances (boiler, cooker, fire)Older homes
£100–£180
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
Infographic · VideoThe Boiler Engineer briefing.
Infographic
Boiler Engineer quick-view
Video guide
Boiler Engineer explained
The CP12 (Landlord Gas Safety Record) is an annual mandatory certificate for any UK property with a gas supply that's rented. Without it, landlords face prosecution and prosecution for tenant injuries. This guide covers what's checked, what it costs in 2026, and the consequences of skipping.
What's Checked
- Boiler combustion (CO levels).
- Gas supply pressure.
- Flue terminations.
- Gas pipework visible (visual inspection).
- Each gas appliance (boiler, oven, fire, water heater).
- Gas meter (visual).
- Ventilation adequacy.
Typical Costs
| Property type | Low £ | High £ | Notes |
|---|---|---|---|
| 1 gas appliance (boiler only) | 80 | 120 | Most common |
| 2 appliances (boiler + cooker) | 90 | 150 | Standard family rental |
| 3+ appliances (boiler, cooker, fire) | 100 | 180 | Older homes |
| HMO multi-unit | Per property | Per property | Each unit needs CP12 |
How Often Required
- Annually — within 12 months of last certificate.
- Within 12 months of new tenancy.
- For any new gas appliance fitted.
UK Regulations
- Gas Safety (Installation and Use) Regulations 1998.
- Tenant has right to receive copy of CP12.
- Landlord must keep records for 2 years minimum.
- Penalties up to £20,000 + criminal prosecution.
Common Problems
- Missing annual deadline — illegal even by one day.
- Forgetting to issue tenant — must give within 28 days of inspection.
- Faulty appliance discovered — repair required before certificate issued.
- Tenant refuses access — document attempts; legal advice for persistent refusal.
- Old appliances unsafe — sometimes engineer condemns; replacement needed.
Frequently Asked Questions
Is CP12 the same as a boiler service?
Different — CP12 is safety check; service is preventive maintenance. Often done at same visit.
What if appliance fails inspection?
Engineer documents the issue. Must be remediated before issuing certificate. Boiler may be condemned.
Do I need CP12 for owner-occupied?
No legal requirement, but annual service is recommended for safety.
How quickly do I need to renew?
Within 12 months of last inspection. Don't slip into expired status.
What's the penalty if I'm late?
Up to £20,000 fine + prosecution + voided tenancy. Tenant can also sue.
Do tenants need a copy?
Yes — within 28 days of inspection. New tenants get it on move-in.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
NEWAI Trade Assistant
Got more questions
about boiler engineer?
Ask follow-ups in plain English. The AI explains options, sequencing and what to ask the boiler engineer — so you walk in informed.
I'm planning a job. Should I be looking for a boiler engineer?
Sounds like a job for boiler engineer. Tell me what you're trying to do — I'll walk you through costs, timeline and what to ask before they start.
FREE QUOTES60 SECONDS
Keep reading
VIEW ALL BOILER ENGINEER GUIDES →More boiler engineer guides.
Guide
Combi Boiler Installation — Cost & UK Install Guide
Combi boiler installation costs in the UK, the install timeline, and how to choose the right unit for your home.
READ GUIDE →GuideSystem Boiler Installation — Cost & UK Install Guide
System boiler installation costs, when they suit a UK home better than combi, and the install detail to know.
READ GUIDE →GuideHeat-Only / Conventional Boiler Installation — UK Guide
Heat-only (conventional) boiler installation: when it suits, costs, and the install detail for UK homes.
READ GUIDE →GuideBoiler Installation Process & Timeline — UK 2026 Guide
What happens during a UK boiler installation, the timeline, what to expect day-by-day, and how to prepare.
READ GUIDE →GuideBoiler Sizing — kW Guide for UK Homes
How to size a UK boiler correctly: the kW calculation, why oversizing is wrong, and how to match boiler to home.
READ GUIDE →GuideBoiler Relocation — Cost & UK Install Guide
Boiler relocation costs in the UK: when it makes sense, what's involved, and the Gas Safe install detail.
READ GUIDE →