This site makes its money when people buy pressure washers, so take the following in that spirit: plenty of households do not need one, and a few would be actively worse off with one. Here is how to tell which you are.
Yes, if you have any of these
Flat concrete. A driveway, a patio, a path, a garage floor. This is the clearest case. Grime and algae sit in the surface texture and nothing short of real pressure or hours of scrubbing removes them. A machine plus a surface cleaner turns an unpleasant annual chore into a morning.
A wooden deck or fence. Gray weathering and mildew need either a pressure washer or a very long afternoon with a brush, and if a stain is going on afterwards the surface has to be properly clean.
A two-story house with siding. Not because siding needs pressure — it does not, it needs detergent — but because reaching an upper wall from the ground needs a machine and an extension wand.
You wash your car often and care about the paint. A pre-rinse and a foam layer genuinely reduce the swirl marks a sponge causes. Though see the cheaper option below.
Probably not, if all of these are true
You have no flat concrete — a balcony, a small deck, gravel. You live in a single-story house or do not clean the exterior. You have nowhere to store one. And your actual list is furniture, bins and a car.
In that case a hose, a stiff brush, a bucket and a bottle of outdoor cleaner will do everything you need, and the money is better spent elsewhere. A pressure washer you get out twice is an expensive object in a garage.
The cheaper things to try first
A no-rinse outdoor treatment. For mossy paving, a shaded fence or a roof, a spray-on-and-leave product does the job over weeks with no pressure and no ladder. For roofs it is the correct answer — pressure washing shingles strips their granules permanently.
A garden-hose foam gun. If the car is the only real reason you are considering a machine, this gets you most of the paint-safety benefit for a fraction of the cost. Comparison in foam cannon vs foam gun.
A pump sprayer and a brush. Siding and fences are a chemistry job. A five-dollar sprayer applies house wash, you let it dwell, and the hose rinses. That is essentially soft washing, and it works.
Renting versus buying
For one large one-off job — cleaning a whole driveway before selling a house — renting a capable gas machine for a day is cheap and gives you more capability than you would buy. The arithmetic flips once you are doing the job annually, because two rentals roughly equal a decent electric machine you then own.
If the answer is yes
Start with how to choose a pressure washer, which gets you to the right capability in five questions, then the beginners roundup. And if the answer is “yes, but only just”, buy the cheapest light electric rather than the biggest machine in budget.
