How Often Should a Commercial Building Be Serviced?
Most building managers know they should be scheduling maintenance. Fewer know exactly how often, or which systems have legal deadlines attached.
Get the frequency wrong and you are either overspending on unnecessary visits or heading towards a compliance gap you did not see coming. This post sets out practical, verified maintenance frequencies for the key systems in a commercial building, and explains where UK law sets the minimum.
It Is Not One Schedule. It Is Several
Different systems wear at different rates and carry different levels of risk. A fire alarm is not serviced on the same cycle as a gutter. Treating your whole building as one maintenance item is how things get missed.
We split assets into four bands at TMS FM: weekly or monthly checks, quarterly visits, annual inspections, and five-yearly statutory requirements. Each band has different obligations, different costs, and different consequences if it slips.
Weekly and Monthly
These are the quick checks that keep day-to-day operations running and flag problems early. Walk-throughs of common areas covering lighting, fire alarms, access control, plumbing fixtures, and lifts sit in this category.
Emergency lighting function tests also fall here. Monthly checks are a requirement as part of a compliant maintenance programme, not an optional extra.
Quarterly
Every three months, a more detailed inspection of major systems is recommended. This includes servicing HVAC units, inspecting roofing for seasonal damage, and reviewing water pressure and drainage performance.
For sites with high footfall, quarterly is also the right cadence for air handling units and commercial boiler checks. Systems under heavy use wear faster than the standard guidance assumes.
Annual
Roof maintenance, fire system servicing, deep cleaning, and mechanical servicing all sit on an annual cycle for most commercial buildings.
Annual statutory inspections include gas safety checks under the Gas Safety (Installation and Use) Regulations 1998. Legionella risk assessments are also required annually under the Health and Safety at Work Act 1974 and L8 Approved Code of Practice. Neither of these is optional.
Every Five Years
EICRs, Electrical Installation Condition Reports, are required every five years for commercial premises. This is not a recommendation. It is a requirement under BS 7671 and the Electricity at Work Regulations 1989.
Air conditioning systems over 12kW must also have a TM44 energy efficiency inspection every five years. Miss this and you are non-compliant regardless of how well the system appears to be running.
A Reference Guide by System
|
System |
Recommended Frequency |
Legally Required? |
|
Emergency lighting tests |
Monthly |
Yes |
|
Fire alarm tests |
Weekly (basic), annual (full) |
Yes |
|
HVAC servicing |
Quarterly to bi-annual |
Partly |
|
Gas safety inspection |
Annual |
Yes |
|
Legionella risk assessment |
Annual |
Yes |
|
Electrical installation (EICR) |
Every 5 years |
Yes |
|
Air conditioning (TM44) |
Every 5 years |
Yes |
|
Roof inspection |
Annual |
No |
|
Lifts (LOLER) |
Every 6 months (passenger) |
Yes |
|
Gutter clearance |
Bi-annual |
No |
What Affects Your Schedule
The frequencies above are starting points. Building age matters. Older buildings generally need more attention than newer ones. Usage intensity matters too.
A retail unit with daily footfall needs more frequent touchpoints than a lightly used office space. Manufacturer guidance on specific plant and equipment is also worth checking, as it can specify tighter intervals than the statutory minimum.
Where We See Things Go Wrong
The most common problem we see is compliance-critical systems sitting on a reactive footing. Fire alarms, electrical systems, and water hygiene are areas where the paperwork is just as important as the physical work. If you cannot show a documented inspection trail, you have a problem regardless of whether the system is functioning.
The second most common issue is no plan beyond the current year. A 3 to 5 year rolling plan for major works such as re-roofing, system replacements, or refurbishments keeps budgets predictable and avoids emergency spending. It also makes conversations with insurers and auditors straightforward.
Getting Your Schedule Right
If you are not certain your current maintenance programme covers what it needs to, a site assessment is the quickest way to find out. At TMS FM, we go through your existing assets, check the statutory obligations that apply to your building type and sector, and build a schedule that covers everything without unnecessary duplication.
Get in touch with the team to arrange a conversation.
Frequently Asked Questions
How often does a commercial boiler need servicing?
A commercial boiler should be serviced at least annually by a Gas Safe registered engineer. High-use systems or older boilers may need more frequent attention. Annual servicing is also a condition of most commercial insurance policies.
Is there a legal requirement to maintain commercial air conditioning?
Yes. Air conditioning systems over 12kW must have a TM44 energy efficiency inspection every five years. Regular servicing outside of that statutory requirement is also advised to maintain performance and extend equipment life.
What happens if a statutory inspection is missed?
Missing a legally required inspection creates direct liability. Depending on the system, consequences can include insurance being invalidated, enforcement action from the HSE, and in the event of an incident, personal liability for the building owner or facilities manager.
Do I need a written maintenance schedule?
For compliance purposes, yes. Certain regulations require documented evidence that inspections have taken place. A written schedule also protects you commercially in the event of a dispute, an insurance claim, or a building audit.