No UK statute requires every commercial boiler to have a document called a "logbook". The duties behind one are real, though: you must keep gas plant safe, maintained and able to show that it is. For commercial property owners and facility managers in the North East, a well-kept boiler logbook is the simplest way to meet that burden of proof. This article explains where those duties come from, what a sound boiler logbook contains, and how to keep records that stand up to an inspection or an insurer's questions. Regulations are described as they stand in 2026, and you should confirm how they apply to your own premises.
Not by name. As far as current HSE and Gas Safe guidance shows, no law says a commercial boiler must come with a document titled "logbook". Some manufacturers supply one with new plant, and some insurers or building contracts ask for one, but that is a contractual or practical matter rather than a statutory one.
The obligation to keep good records comes indirectly, from two sources:
A common misconception is that the landlord's annual gas safety check and record apply automatically to commercial buildings. Those rules, which require a check every 12 months and records to be kept and given to tenants, are aimed at rented residential accommodation. A purely commercial unit, such as an office, warehouse or retail space, is not covered in the same way.
Mixed-use buildings are where it gets less clear. If you have flats above a shop, or residential accommodation attached to a commercial property and served by the same plant, the landlord duties may apply to that part of the building. Check the position with your Gas Safe registered engineer or a legal adviser.
Even where no one rule demands a logbook, the absence of records leaves you unable to demonstrate compliance. An HSE inspector, a local authority officer, an insurer or an incoming tenant will not take your word that the boiler was serviced. They will want evidence, and a logbook is the most convenient way to hold it.
Several pieces of legislation and several private documents shape what you should record. Which apply depends on the size, type and use of your plant.
Under the Gas Safety (Installation and Use) Regulations 1998, anyone carrying out work on gas appliances must be competent, and in Great Britain that means Gas Safe registered. Gas Safe registration is also specific to the types of gas work an engineer is qualified for, so confirm that your engineer is registered for commercial work. You can check both on the Gas Safe Register, and you should do so before an engineer first works on your site.
Steam boilers and some high-pressure hot water systems may fall under the Pressure Systems Safety Regulations 2000. Where they apply, a competent person must draw up a written scheme of examination, which sets out what must be inspected and how often, and the system must be examined in line with it. Whether your plant qualifies depends on its pressure and contents, so confirm this with your engineer or insurer rather than assuming either way.
Emissions rules, including Medium Combustion Plant permitting, can apply to larger units based on their rated thermal input. Thresholds and requirements are updated from time to time, so check current figures with the Environment Agency or your local authority if your plant is at the larger end of the commercial range. Permit conditions can carry their own monitoring and record-keeping duties.
Manufacturers' instructions and insurance policy conditions often specify maintenance intervals. Annual servicing is common, but read your own documents rather than assuming. A missed interval can weaken a warranty or a claim, and your logbook is where you prove it was met.
A useful logbook identifies the plant, records everything done to it, and makes it easy to see at a glance what is outstanding. Four groups of information cover most needs.
Record every repair and component replacement, with the parts fitted. Note any warning issued by an engineer, any appliance classed as unsafe, and what was done in response, including the date it was resolved. An unresolved warning with no follow-up is worse than no entry at all.
A basic logbook page can use these column headings, with one row per event:
A service invoice is not a substitute. Invoices show that a visit was paid for, not what was found, measured or left unresolved.
The person who made the observation or carried out the work should make the entry, and the type of entry decides who that is.
Anything technical about gas work, combustion readings or safety checks must come from a Gas Safe registered engineer. Site staff must never attempt gas, boiler or flue work, including what may look like minor fixes such as resetting components, adjusting settings or clearing a flue. Those are jobs for a registered engineer, every time.
Your own team can still contribute useful information. Legitimate entries include:
This is reporting, not repair. It gives the engineer a history to work from and shows you acted promptly.
Appoint one responsible person to own the logbook. The duty holder checks that entries are made, that defects are chased and that engineer reports are filed. Put a handover step in place for when that person changes role or leaves, so the logbook never ends up with no one in charge of it.
Keep engineer service reports and certificates attached to the relevant entries, or cross-referenced by number. Ask your engineer to supply copies in a consistent format each visit, which makes gaps and changes much easier to spot.
Either format is acceptable if the record is accurate, accessible and not easily lost or altered. A paper logbook kept in the plant room is convenient but vulnerable to damp, damage and loss. Digital records are easier to search and share, provided they are backed up. For multi-site portfolios, hold a copy off-site so that a problem at one building does not wipe out its history.
The sensible approach is to keep the full life history of the plant, from commissioning to decommissioning, and to pass it on if the building is sold or leased. There is no single retention figure that suits every situation, so confirm any specific period with your insurer or legal adviser.
Records that are complete and organised make each of these conversations shorter and less contentious.
Book servicing before autumn heating demand begins, rather than during the first cold snap when engineers are busiest. This matters particularly for sites in Newcastle, Sunderland, Teesside and Northumberland, where buildings such as schools, offices and industrial units are often left unoccupied over summer or holiday periods and restarted in cold weather. A boiler that has sat idle can reveal faults only when it is fired up under load, so a pre-season service and a logbook entry that records the findings are worth far more than a reactive repair in January.
Most logbook failures are not dramatic. They are small omissions that look serious only when someone asks for the evidence.
A logbook is for planned records, not emergencies. If you smell gas or suspect a leak, leave the area immediately, avoid switching electrical items on or off, and call the National Gas Emergency Service on 0800 111 999. Once everyone is safe, record the event, the time and the action taken, and arrange for a Gas Safe registered engineer to inspect the plant before it is used again.
The duty is not to own a book with a particular title. It is to keep gas plant safe and to be able to prove it, and a complete logbook, backed by Gas Safe registered service reports, does exactly that. If you manage commercial premises anywhere in the North East or Northumberland, we can carry out annual inspections and set up a maintenance contract that includes full, consistent service records for every visit. Our engineers are Gas Safe registered, and you can check that on the Gas Safe Register at any time.
Find out how our Learn more about our services page covers inspections, maintenance contracts and emergency callouts, or read the FAQ for answers to common questions about commercial boiler servicing.