01/06/2026
One of the most common questions we get from Preston business owners is: "What gas safety certificate does my business need?" It's a good question — and getting the wrong answer can leave your business legally non-compliant even if a certificate has been issued.
Here's a straightforward guide from SMR Gas Maintenance Ltd, commercial gas engineers based in Preston, Lancashire.
CP15 — Commercial Catering Gas Safety Certificate
If your Preston business has a commercial kitchen — a restaurant, pub, hotel, school canteen, hospital kitchen or care home kitchen — you need a CP15 annual gas safety inspection. This covers all commercial catering gas appliances including ranges, ovens, grills, fryers, and associated gas pipework and interlocks. Only a Gas Safe Registered engineer with the CP15 commercial catering competency can legally issue this certificate.
Businesses that need a CP15 in Preston include restaurants, takeaways, pubs and bars, hotels, schools, hospitals, care homes with commercial kitchens, and any other premises with gas catering equipment.
CP16 — Commercial Heating and Hot Water
The CP16 covers commercial boilers and hot water systems. If your Preston business premises has a commercial boiler — which most do — you need an annual CP16 gas safety inspection. This is not the same as a domestic boiler service and cannot be carried out by a domestic-only gas engineer. A suitably qualified commercial gas engineer with the CP16 competency must carry out this inspection and issue the certificate.
Businesses that need a CP16 in Preston include offices, factories, warehouses, schools, care homes, hotels, retail premises, and any commercial building with a commercial boiler or hot water system.
CP17 — Commercial Central Heating Systems
The CP17 covers the full commercial central heating system — not just the boiler but the entire heating circuit, including pipework, controls, and heat emitters. For larger premises such as care homes, schools, offices and commercial buildings, a CP17 inspection provides the most comprehensive gas safety documentation for the heating system as a whole.
This is particularly important for care homes in Preston and Lancashire, where CQC inspectors and Local Authority Environmental Health teams expect to see full documentation of the entire heating system, not just the boiler.
CP42 — LPG Systems
If your Preston premises runs on LPG rather than mains gas — common in rural areas around Preston and Lancashire — a CP42 inspection is required. This covers bulk LPG storage, regulators, pipework, and associated appliances. SMR Gas Maintenance Ltd carry out CP42 inspections for commercial LPG premises across Lancashire.
Why the right certificate matters
Using an engineer without the correct competencies is not just a legal risk — it's a safety risk. A Gas Safe Registered engineer can only legally carry out work within their area of competency. A domestic gas engineer cannot legally issue a CP16 or CP17. An engineer without CP15 competency cannot certify your commercial kitchen.
Always check your engineer's Gas Safe card covers the specific type of work being carried out on your premises. If something goes wrong and your certificate was issued by an unqualified engineer, your insurance could be invalidated and you could face HSE enforcement action.
Some commercial gas companies in Preston market themselves broadly but may not hold all the competencies your business actually needs. At SMR Gas Maintenance Ltd, our engineers hold the relevant commercial competencies for CP15, CP16 and CP17 work — and we'll always confirm exactly what your premises requires before carrying out any inspection.
Book your commercial gas safety inspection in Preston
Whether you need a CP15 for your commercial kitchen, a CP16 for your boiler, a CP17 for your full heating system, or all three, SMR Gas Maintenance Ltd are ready to help. We cover Preston, Leyland, Bamber Bridge, Chorley, Blackburn, and the wider Lancashire area — with 24/7 emergency cover available.
📞 01254 485183 | 📱 07882 898492 | ✉️ info@smrgasservices.co.uk | 🌐 www.smrgas.co.uk | Gas Safe No: 562186
