Standby power, PUWER 1998
Generator servicing near me: what does it cost?
A 30kVA standby set and a 1MVA prime mover are different services, so we publish what drives your quote, not an average. No law sets a service interval; the duty is to keep the set in efficient working order.
No statutory interval
PUWER requires work equipment to be maintained in an efficient state, in efficient working order and in good repair, and sets no service frequency
Risk assessment
how inspection frequency is set: HSE states the need for inspection and inspection frequencies should be determined through risk assessment
1MWth
capacity at which the medium combustion plant permitting regime starts to apply in England and Wales
What happens next
- Tell us about the set: size, role, what you need doing. Two minutes, no account.
- We pass your details to generator service providers covering your postcode, and to no one else.
- They contact you with a price for your actual plant. Compare, choose, or walk away.
Generator Servicing Cost is a free introduction service; we pass your details to generator service providers covering your site, who quote you directly. We may receive a fee from providers; you pay nothing and are under no obligation. We are not affiliated with, endorsed by or acting for HSE, the Environment Agency or any equipment manufacturer, and nothing here is legal or health and safety advice: your maintenance regime and its intervals are matters for your own risk assessment and your manufacturer's schedule.
What sets the price of a generator service, 2026
Last updated
Generator servicing quotes vary more than almost any other plant service. The phrase covers everything from an oil and filter change on a small standby set to a load bank test with fuel sampling on a critical installation. Here is what a provider prices, why each item moves the number, and the question to ask before comparing quotes.
This is a cost-driver table, not a price list. It is compiled from the way standby generator service work is scoped in the UK in 2026: the set, the service content, the testing regime, the fuel system and the site. We publish no average price because there is no checkable UK dataset of generator service prices, and an unverifiable average is worse than none. The regulatory rows are sourced to HSE guidance on PUWER and to gov.uk guidance on medium combustion plant and specified generators, linked below. For a real number, use the quote form.
| Cost driver | Why it moves the price | What to ask for in the quote |
|---|---|---|
| Set size and engine make | Oil volume, filter cost and labour hours scale with the engine, and parts availability varies sharply between mainstream and niche engine brands. | A price per set, quoted against engine and alternator make, model and serial. |
| Service content, not the service name | Minor and major service definitions are manufacturer and provider conventions. A minor is usually oil, filters and checks; a major adds coolant, belts, injectors or valve clearances depending on the engine. | The parts and tasks list for each visit, and which engine hours milestone each corresponds to. |
| How the set is actually used | A standby set that runs 20 hours a year and a prime mover running weekly reach their hours-based service points at completely different rates, so annual pricing can badly misrepresent the cost. | Servicing planned on run hours as well as calendar, using the controller's hours counter. |
| Load testing regime | Off-load running proves the engine starts, not that it will carry the load. A load bank test needs equipment on site, cabling, and time, and is a separate cost from the service. | Whether load bank testing is included, at what percentage of rating and for how long, and who supplies the load bank. |
| Fuel condition and tank | Diesel degrades and grows contamination in storage, which is the classic reason a set that started fine last month fails when it matters. Sampling, polishing and tank cleaning are separate jobs. | A fuel sample and report as part of the service, and a separate quote for polishing or tank cleaning if the sample fails. |
| Batteries, charger and starting system | Failure to start is most often a battery or charging fault rather than an engine fault, and battery replacement is a routine, predictable, dated item. | Battery age, tested condition and replacement date, rather than a pass or fail tick. |
| Control panel, ATS and interfaces | Automatic transfer switch and control panel testing means proving the changeover under simulated mains failure, which involves the electrical installation, not just the engine. | Whether the ATS and the mains failure simulation are in scope, and who is authorised to switch. |
| Access, hours and permits | Rooftop plant rooms, containerised sets in yards, permit-to-work regimes and out-of-hours testing all add labour before any work is done. | Standard and out-of-hours labour rates, callout charge, and whether travel is billed separately. |
| Environmental permitting and emissions | Larger sets can fall inside the medium combustion plant or specified generator permitting regimes in England and Wales, which brings emissions obligations that a service contract may or may not support. | Whether the provider supports permit compliance and emissions testing, and whether your set is in scope at all. |
- There is no statutory service interval for a standby generator in the UK: PUWER requires work equipment to be maintained in an efficient state, in efficient working order and in good repair, and leaves the frequency to the manufacturer's schedule and to risk assessment (HSE, 2026).
- HSE states that the need for inspection and inspection frequencies should be determined through risk assessment, taking account of the manufacturer's recommendations and the conditions the equipment is exposed to.
- Load bank testing exists because off-load running proves a standby set will start, not that it will carry its rated load; it is a separate purchase from a routine service.
- Stored diesel degrades, so fuel sampling and, where needed, polishing or tank cleaning are a distinct line item on standby generator maintenance rather than part of an engine service.
- In England and Wales the medium combustion plant regime applies to plant of 1MWth or more and less than 50MWth, and the specified generator regime applies to generators up to 50MWth, with exclusions in both cases (gov.uk, 2026).
Cite this page
“What sets the price of a generator service, 2026”, Generator Servicing Cost, https://generatorservicingcost.co.uk/ (updated 2026-10-30). This is a cost-driver table, not a price list. It is compiled from the way standby generator service work is scoped in the UK in 2026: the set, the service content, the testing regime, the fuel system and the site. We publish no average price because there is no checkable UK dataset of generator service prices, and an unverifiable average is worse than none. The regulatory rows are sourced to HSE guidance on PUWER and to gov.uk guidance on medium combustion plant and specified generators, linked below. For a real number, use the quote form.
Guides
Every figure sourced and dated.
- Annual generator maintenance cost: what you are paying for
Annual generator maintenance cost explained: the £250 to £275 service prices UK providers publish, a year of standby visits, and how to compare two quotes.
- Generator service intervals: what the law says, and what it does not
There is no statutory service interval for a standby generator. PUWER sets a duty to maintain; the manufacturer sets the schedule in hours or calendar time.
- Generator load bank test: how to load test a generator
What a generator load bank test proves that an off-load run does not, why lightly loaded diesel standby sets need it, and what to specify in a quote.
- Generator maintenance contracts: what to put in one
How generator maintenance contracts and annual maintenance contracts are priced, what a service level agreement promises, and the clauses that matter.
The questions we get
How much does generator servicing cost?
Size, make, scope and site set it. Only 3 of 58 UK providers we read publish a price, £250 to £275 for a standard diesel service (median £265, read 12 October 2026). Treat that as an entry price, not an average. The biggest swings are load bank testing, fuel work, transfer switch proving, and access or out-of-hours needs.
How do I find generator maintenance near me?
Use the form on this page. Tell us the set's size, make and location and what you need: a routine service, a maintenance contract or a fault. Your request goes to at most three generator service providers covering your site, who quote you directly. Ask each for a per-set price with the task list attached, so the quotes compare.
Is there a legal service interval for a standby generator?
No. A generator is work equipment under PUWER 1998, which requires it to be kept in an efficient state, in efficient working order and in good repair. Any maintenance log must be kept up to date. It sets no frequency: HSE expects inspection frequency set by risk assessment, taking account of the manufacturer's recommendations and operating conditions.
Why do generators need load bank testing?
Because starting is not the same as working. An off-load run proves the battery, starter and fuel line. A load bank applies an artificial load so the set runs towards its rating, revealing cooling, fuelling, alternator and exhaust problems. It also clears the unburnt fuel and oil that build up in lightly loaded standby engines.
Does diesel go off in a standby generator tank?
Yes. Stored diesel degrades and can grow microbial contamination and water, which is a classic cause of a standby set failing when it is finally called on. Fuel sampling, and where the sample fails, polishing or tank cleaning, is a distinct line of standby generator maintenance rather than part of an engine service.
Does my generator need an environmental permit?
It might, if large enough. Gov.uk says the medium combustion plant regime covers plant of 1MWth or more and under 50MWth. The specified generator regime covers generators up to 50MWth. Both have exclusions and apply in England and Wales, regulated by the Environment Agency and Natural Resources Wales. Check current gov.uk guidance for your set.
Can I get a generator repair near me, not just a service?
Yes. Choose 'Fault, will not start or will not take load' in the form. Your request goes to generator service providers covering your site, who quote for the repair directly. A fault found at a routine service is quoted the same way unless your contract already covers it.
Is this quote service really free?
Yes, free to you and with no obligation to accept any quote. We pass your details only to generator service providers covering your site, who quote you directly. We may receive a fee from those providers, which is how the service is funded.
Sources
This site's own datasets, every figure quoted from its source and dated:
- The median published figure in the UK Generator Service Price Index is 265 GBP across 3 sources' own pages (range 250 to 275 GBP), read 11 November 2026.
- The UK Standby Generator Obligations carries 8 published figures read from 3 sources' own pages; the 3 published figures given without a breakdown run from 50 to 50 hour, read 7 November 2026.
- HSE. Provision and Use of Work Equipment Regulations 1998 (PUWER)
- HSE. PUWER overview
- HSE. Inspection of work equipment
- HSE. Maintenance of work equipment
- legislation.gov.uk. The Provision and Use of Work Equipment Regulations 1998
- gov.uk. Medium combustion plant and specified generators: environmental permits