How Far Should a Pressure Washer Nozzle Be From the Surface?

For most hard outdoor surfaces, hold the nozzle roughly 15cm to 30cm (6 to 12 inches) away. Softer or more fragile materials such as timber decking, painted render and car bodywork want 30cm to 60cm, and anything you are unsure about should be started at arm's length and brought in slowly. Distance is the single easiest way to control how aggressive a pressure washer is, and it costs nothing to adjust.

Why distance matters as much as pressure

The number printed on the box is the pressure at the pump, not the pressure hitting your patio. Once water leaves the nozzle it spreads out and slows down, so the force landing on the surface drops off fast as you pull back. Double the distance and the same jet is spread over a much larger patch, which means far less energy per square centimetre.

That is why two people with identical machines can get completely different results. One strips moss cleanly, the other carves stripes into the slabs. The machine has not changed, the standoff distance has. It also means you do not need a weaker washer to clean delicate things, just more space between the nozzle and the surface.

Safe working distances by surface

Treat these as starting points rather than rules carved in stone. Age, condition and how well something was laid all change the answer.

• Concrete driveways and paths: 15cm to 25cm. Sound concrete takes a lot, but old or poorly finished slabs can still lose their surface layer.
• Block paving: 20cm to 30cm. Closer than that and you will strip the jointing sand out much faster than you clean the blocks.
• Natural stone and porcelain paving: 25cm to 30cm. Porcelain is hard but the joints are usually the weak point.
• Brickwork and mortar: 30cm minimum. Soft old lime mortar can be washed out entirely, so keep the lance moving and stay off the joints.
• Painted render or masonry paint: 30cm to 45cm. If paint lifts, you are too close or it was already failing.
• Timber decking and fencing: 30cm to 45cm with a wide fan. Soft pine furs up and splinters easily.
• Cars, vans and caravans: 45cm to 60cm for panels, further from trim, badges and rubber seals.
• UPVC, gutters and conservatory roofs: 30cm to 60cm. Seals and silicone fail first, not the plastic.
• Garden furniture, bikes and mowers: 45cm plus, never straight at bearings, chains or electrics.

Always start far and work closer

The habit worth building is simple. Pull the trigger with the lance well back, then close in gradually until you see the dirt shifting. Never do it the other way round. Damage from a jet held too close happens instantly and does not buff out, whereas a pass that is too gentle just means going round again.

This matters most on the first pull of the day, because the machine often delivers a short pressure spike as the hose charges. Point that at the ground rather than straight at your paving.

How nozzle angle changes the answer

Distance and fan angle work together. A narrow 15 degree jet concentrates everything into a thin line, so it needs more standoff to be safe. A 40 degree fan spreads the same water out and can be used closer without marking anything.

• 0 degree red: a pencil jet. Very few home jobs need it. If you use it at all, stay 45cm back and keep it moving.
• 15 degree yellow: good for stubborn ground in dirt on concrete at 20cm to 30cm.
• 25 degree green: the general purpose choice for patios and paths at 20cm to 30cm.
• 40 degree white: gentle rinsing, cars, render and timber at 30cm plus.
• Rotary or turbo: spins a narrow jet in a cone. Effective on concrete but it will scar softer surfaces, so keep it around 25cm to 30cm and off anything delicate.
• Patio cleaner attachment: sets the distance for you and holds it steady, which is exactly why the finish comes out so even.

Angle of attack, not just distance

Holding the lance at roughly 45 degrees to the surface lifts dirt and pushes it away instead of driving it in. Straight on at 90 degrees puts the full force into the material and, on paving, forces water down into the joints. Keep the lance moving in steady overlapping passes at a consistent height, because pausing in one spot is what creates the pale patches and swirl marks people notice once everything dries.

Signs you are too close

Stop and pull back if you see any of these while you work:

1. Visible lines or stripes tracking exactly where the jet has passed.
2. Sand or jointing compound blowing out of the gaps in clouds.
3. Wood fibres standing up or a fuzzy texture appearing on decking.
4. Paint flaking off in flags rather than washing away as dirt.
5. A rougher, more porous feel to concrete once it dries.

None of these repair themselves. Stripped paving sand can be topped up, but etched concrete and furred timber are there for good.

If you are using detergent, apply it with a low pressure nozzle from around 30cm and let it dwell for the time on the bottle before rinsing. Chemistry doing the work means you can stay further back on the rinse pass, which is easier on the surface and easier on you.