Site generators cost from around £5,500 for a small 44kVA set to £24,000 for a larger silenced unit, usually financed by contractors who need power on every site.
Yes, site generators are financed as a standard asset purchase, usually on hire purchase or a lease, with the machine itself acting as the security. UK prices typically run £3,000 to £90,000, and most deals are written over 12-84 months with a deposit of around 10-20%. Decisions typically take 24–48 hours. Used machines are financeable too, usually with a shorter term.
Typical Cost
£3k – £90k
Approval Speed
24–48 hours
Same-day for straightforward deals
Rates From
4.5% - 8.4% per annum
Your estimate
Indicative only. Not a quote and not an offer of finance.
Pre-filled with a typical site generator price. Indicative only, not a quote.
Explore business funding options through Fundably
For UK limited companies with 3+ months’ trading and monthly revenue.
On a purchase price of £22,000: a 10% deposit of £2,200, then 48 monthly payments of £464 at 5.9% APR representative (fixed). Total amount payable £24,472, including the deposit. The rate you are offered depends on your business and the asset.
Guide prices for sizing a finance agreement, not quotes. Manufacturers in this market mostly price on application, so where a current UK list price could not be confirmed the row describes a specification class rather than naming a model. Your supplier quote is what the agreement is written against.
| Machine or specification | Guide price | Type |
|---|---|---|
| FG Wilson P44-3 | £5,500 - £8,500 | 44kVA Diesel Generator |
| Himoinsa HYW-45 T5 | £12,000 - £18,000 | 45kVA Silenced Generator |
| Atlas Copco QAS 60 | £16,000 - £24,000 | 60kVA Silenced Generator |
| FG Wilson P110-5 | £14,000 - £20,000 | 110kVA Diesel Generator |
Explore business funding options through Fundably
For UK limited companies with 3+ months’ trading and monthly revenue.
A site generator is treated as plant and machinery for tax purposes, so it qualifies for the Annual Investment Allowance (AIA), letting a business deduct the full cost from taxable profits in the year of purchase, up to the current £1,000,000 annual limit. Companies buying new, unused equipment may also qualify for full expensing, a 100% first-year deduction against Corporation Tax. These allowances apply where you own the asset, so they are available under a Hire Purchase agreement. Under a Finance Lease or Operating Lease you do not own the site generator outright, so allowances are not claimed directly; instead the payments are generally deducted as a business expense against profits. Always confirm treatment with your accountant before committing to a structure.
Site generators are bought by contractors working on sites without a mains connection, and by businesses that want backup power for critical loads such as pumps or welfare units. Contractors running several concurrent sites often find owning a generator cheaper over time than repeat hire, particularly once fuel and delivery charges are factored in. Replacement is driven by engine hours and the age of the alternator and control panel rather than a fixed schedule, and demand for quieter, more fuel-efficient units has pushed many buyers towards newer silenced or hybrid battery-generator combinations.
Some specialist lenders consider businesses with imperfect credit histories. You may need a larger deposit or personal guarantee, but options may be available. Fundably may use a soft credit check for matching, which does not affect your credit score. A hard check may happen if you choose to proceed with a lender.
Explore business funding options through Fundably.
For UK limited companies with 3+ months’ trading and monthly revenue.
Explore business funding options through Fundably.
Check Eligibility →For UK limited companies with at least 3 months’ trading and monthly revenue.