Motoring, cost per wash
Cost per wash: pressure washer or a hand car wash
A hand car wash has no upfront cost, so it always looks like the cheaper option on the day. A pressure washer has nothing but upfront cost, so it always looks like the dearer one. Only one of those impressions survives past a handful of washes.
Some links on this page are affiliate links, which earn us a commission if you buy. It costs you nothing extra, and it never changes which option comes out cheapest here, because the ranking is arithmetic. How this works.
The shape of the question
A hand wash costs the same every single time, because you are paying someone else to do it. A pressure washer costs a lot once, then almost nothing, because the only ongoing cost is the electricity to run the pump and the water it sprays. Those two cost lines cross at a specific number of washes, and everything else in this article is detail around that one number.
| Option | Running | Cost per wash | Relative |
|---|---|---|---|
| Buy a pressure washer£150, eight years | £1.15 | £2.72 | |
| Hand car wash£8 a time | £8.00 | £8.00 |
At twelve washes a year, buying a pressure washer costs £2.72 a wash against £8.00 for a hand wash, a gap of £5.28 a wash and roughly £63 a year. That gap is bigger than most people expect, because a hand wash's price already includes someone else's time and premises, and a pressure washer's running cost is mostly just water on a meter.
Where the lines cross
| Times washed | Hand car wash at £8 a time | Buy a pressure washer at £150 | Cheaper |
|---|---|---|---|
| 1 | £8.00 | £151 | Hand car wash at £8 a time |
| 4 | £32 | £155 | Hand car wash at £8 a time |
| 10 | £80 | £162 | Hand car wash at £8 a time |
| 15 | £120 | £167 | Hand car wash at £8 a time |
| 22 | £176 | £175 | Buy a pressure washer at £150 |
| 30 | £240 | £185 | Buy a pressure washer at £150 |
| 50 | £400 | £208 | Buy a pressure washer at £150 |
22 washes. That is the whole calculation, and it is a smaller number than the sticker price suggests: a £150 machine only has to beat 22 trips to a hand car wash at £8.00 each before it has paid for itself, and every wash after that is running cost alone. Someone who washes the car once a fortnight through spring and summer reaches that inside two years. Someone who washes it twice a year takes most of a decade, which is longer than a lot of domestic pressure washers actually last.
A hand wash also dries the car, does the wheels properly and takes ten minutes of your time rather than half an hour. A pressure washer needs somewhere dry to live, a tap it can reach, and a driveway or path you are allowed to get wet. None of that is priced above, and for a lot of households it is what actually decides the answer.
Where hand washing still wins
Anyone without a drive, an outside tap, or anywhere to store a machine the size of a small suitcase. A pressure washer used four or five times a year, honestly, never reaches the breakeven point inside a normal ownership period, and a hand wash for those people is not a false economy, it is simply the correct answer. It is also the only option if the car has to be washed somewhere without a domestic water supply at all.
Where buying wins
Anyone washing the car at least once a month, or anyone who will point the same machine at the patio, the decking or the bins, which is most people who buy one. A pressure washer bought for the car alone and never used for anything else is a narrower case than the shops make it look, and the breakeven number above assumes exactly that narrow case: if it earns its keep on other jobs too, it pays for itself faster than the car washing alone suggests.
The water meter changes the answer
Every figure here assumes metered mains water at £4.60 per cubic metre, which is what most UK households now pay. Two hundred litres a wash comes to under a pound, so water is a small part of the running cost either way, but it is not nothing, and a garden hose is not free just because nobody sends you a separate bill for it. On an unmetered, rateable-value water bill the running cost of the pressure washer drops further still, which only widens the gap in its favour.
The verdict
Work out how often you would actually use it, not how often you imagine using it in April. Above about a wash a month, a £150 pressure washer is one of the faster payback purchases in a garage, at 22 washes against a machine with an eight year life. Below that, a hand wash at £8.00 a time is not laziness, it is the cheaper option, and there is no shame in an honest number that says so.
Put your own numbers in
Prefilled with a pressure washer. Change the price to whatever machine you are actually looking at, and set the washes a year to the honest number.
Cost per meal
Set the purchase price to zero for the running cost alone.
Questions
Is it cheaper to buy a pressure washer or pay for a hand car wash?
Buy, if you will use it more than about 22 times over its life. A £150 machine breaks even against a £8.00 hand wash inside 22 washes, which most people who wash their own car reach within two or three years.
How much does a hand car wash cost in the UK?
A basic exterior wash at a forecourt or hand car wash site typically runs £6 to £12, covering bodywork, wheels and windows. This article uses £8.00 as a mid-range figure.
How much electricity and water does a pressure washer use per wash?
A typical domestic machine draws about 1.8kW and runs for roughly half an hour, using around 0.9kWh of electricity and 200 litres of mains water, at 26.11p per kWh and £4.60 per cubic metre respectively that comes to about £1.15 a wash.
Is washing a car with a hose and bucket cheaper than either option?
Usually yes, if you already own a hose and bucket. It is not covered above because the comparison here is against paying someone, but water on a meter still costs money even out of an ordinary hose, it is simply a smaller and less thorough wash than a pressure washer gives.
How often do people actually need to wash a car?
There is no fixed answer, but the breakeven number is the useful test: below roughly a wash a month, a pressure washer bought for car washing alone rarely earns back its price before it wears out. Above that, it usually does.
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More motoring costs, or read how we work these out.
Prices used on this page
- Electricity, 26.11p per kWh. Ofgem price cap, direct debit, average of England, Scotland and Wales, including 5% VAT.. Ofgem energy price cap unit rates and standing charges. Checked 22 August 2026.
- Water and sewerage, £4.60 per cubic metre. Combined volumetric water and wastewater charge, metered. Mean of three large suppliers for 2026/27: Thames Water £4.02, United Utilities £4.75, Anglian Water £5.03 per cubic metre.. Published 2026/27 household charges, Thames Water, United Utilities and Anglian Water. Checked 22 August 2026.