Is high pressure always the right method?

No — roofs, render and painted surfaces need low-pressure “soft wash” with the right chemistry. Too much pressure strips coatings and forces water under tiles. Ask which method suits your surface.

What is the risk on older painted surfaces?

Paint from before 1970 may contain lead, and aggressive cleaning can spread lead dust — it needs safe management under AS 4361. Confirm how older surfaces will be handled.

How do you vet a pressure cleaner?

Written quote (method, surfaces, chemicals), public-liability insurance for overspray and water-ingress risk, and references.

Pressure cleaning / Driveway · roof · render · soft wash

Hiring a Pressure Cleaner is buying the right pressure — the wrong one wrecks the surface.

A 4000-PSI gun in untrained hands will strip render in twenty seconds, lift roof tiles off battens, and shear timber decking. The right operator knows which surfaces want high pressure, which want soft wash, and which want chemistry alone. This guide tells you which is which.

Driveway cost

$280–$650

Standard double driveway, concrete or pavers

Roof clean

$650–$1,800

Soft wash + treatment, single-storey tile

Render limit

800 PSI

Maximum safe pressure on standard acrylic render

Sources

39 verbatim buyer accounts; EPA water discharge guidelines; AS 4361 lead-paint disturbance; manufacturer specs (Karcher, Stratco, Spray Seal).

Verification

Pricing cross-checked against three operator quotes per state (Nov 2025–Apr 2026). PSI limits verified against manufacturer technical data sheets.

Funding

Independent. We don't take fees from operators or chemical suppliers. How this works.

Before we start

The phrase “pressure cleaning” covers two distinct techniques that should never be confused. High-pressure cleaning uses mechanical force to dislodge dirt — suited to concrete, brick, and unfinished masonry. Soft wash uses low pressure with biocides — suited to roofs, render, painted surfaces, and anything that fragments under impact. A good operator chooses; a bad one points the gun at everything.

In a hurry? Start here

Jump to what you need

I've got quotes

Compare them properly

Most pressure cleaner quotes price different scopes. See what a real quote contains, line by line.

I need someone now

Handle it urgently

Make-safe price first, full quote second — and verify the licence before anyone starts.

Is this one legit?

Verify this tradie

The free 60-second routine: licence, insurance, ABN, history — before you pay a deposit.

My state

Check your state rules

Licensing, deposit caps and the common gotcha for your state and territory.

Or grab the four printable buyer checklists →

90-second briefing

Read this first

Before you hire a pressure cleaner, know this.

1
Pressure washing and soft washing are different — the wrong one strips render or roof coatings.
2
Confirm which surfaces are included (driveway, roof, render) and the method for each.
3
Roof cleaning at height needs fall protection and insurance — confirm before they go up.
4
Ask whether water use, run-off handling and any sealing are included.
5
Get the insurance details and a written scope before any deposit.

What pressure cleaning costs

Pricing is per square metre, modified by access difficulty, surface type, and whether sealing or chemical treatment is included. The headline rate often doesn't include the chemistry, the sealer, or the disposal.

2026 price bands · by surface

Concrete driveway (clean only)	$3–$6/m²
Pavers (clean + sand reinstate)	$8–$14/m²
Roof tile (soft wash + treatment)	$5–$12/m²
Render / painted brick	$6–$14/m²
Timber decking (with brightener)	$10–$18/m²
+ Sealing (post-clean)	$8–$22/m²
Typical driveway visit	$280–$650

Two-storey roof access adds $200–$500. Bird-strike or moss treatment +20%. Minimum call-out usually $250.

How to vet a pressure cleaner

“

He cleaned the render and it looked great. Three weeks later we noticed lines — the paint had stripped right back to the bagging in patches. Cost $8,400 to re-render the front façade.

— Buyer, Inner West Melbourne VIC

Green flags

· Asks about surface type before quoting
· Distinguishes soft wash from high pressure
· Public liability $10M+, certificate available
· States PSI used for your specific surface
· Run-off / EPA disposal plan stated for chemicals

Red flags

· "We use 4000 PSI on everything"
· No insurance information offered
· Promises to remove all stains — no surface is universal
· Will pressure-clean pre-1970 painted surfaces without testing for lead
· No mention of stormwater drain protection

Lead paint, asbestos, chemical run-off

Pressure cleaning is unregulated as a trade — no licence required. But the materials you might be cleaning are very much regulated. Lead-painted surfaces and asbestos fibres become airborne / waterborne under pressure, and that triggers environmental law.

Three regulatory triggers

Lead paint (pre-1970 homes). Pressure cleaning lead-painted surfaces is regulated under AS 4361. Either test first or assume positive and use containment.
Asbestos cement sheeting. Pressure cleaning AC sheet eaves, garage walls, or fences releases fibres. Illegal in every state without proper containment and licensing.
Chemical run-off to stormwater. Hypochlorite, sodium hydroxide, and surfactants entering stormwater drains can trigger EPA fines $5,000+. Drain blocks & vacuum recovery required.

Part Two · Specifying the job

How often (and when not to)

· Driveway: every 12–24 months, more frequent if under trees
· Roof: 3–5 years (soft wash); never more frequently — you erode the surface
· Render & painted walls: annual gentle clean, not high pressure
· Decking: annual, ideally before resealing
· Pre-sale touch-up: 1–2 weeks before listing photos
· Don't clean: in heavy wind (overspray), within 24h of rain (mortar swelling), or in direct sun on dark surfaces (chemical flash)

High-pressure vs soft wash — the right tool

The two techniques solve different problems. High pressure removes physical deposits (dirt, lichen, paint). Soft wash kills biological growth (mould, mildew, algae) chemically, then rinses gently.

	High pressure	Soft wash
Typical PSI	2,500–4,000	100–500
Mechanism	Physical force	Chemistry + dwell time
Best for	Concrete, brick, unfinished masonry	Roof, render, paint, timber
Chemistry	Sometimes pre-treatment	Always — biocide / hypochlorite
Risk to substrate	High if misused	Low (chemistry-led)

Surface guide — driveway, roof, brick, render

Surface	Method	Max PSI
Plain concrete	High pressure + degreaser	4,000
Exposed aggregate	Medium pressure	2,200
Pavers (clay/concrete)	Medium + sand reinstate	2,000
Sandstone / soft stone	Soft wash only	500
Painted brick / render	Soft wash	800
Roof tile	Soft wash + biocide	600
Colorbond roof	Soft wash only	500
Timber decking	Low pressure + brightener	1,200
Vinyl windows	Hand wash only	N/A

What pressure cleaning can destroy

The damage list is longer than most owners realise — and most of it is invisible at the time of the clean.

· Render & paint stripped from walls. Not always obvious immediately — failure shows weeks later when sun cures the damage.
· Tile roof lifted off battens. Pointing damaged, water ingress in next rain.
· Mortar washed from brickwork. Older lime mortar especially.
· Timber decking shredded. Lifts the grain, splinters appear, requires sanding.
· Window frame seals breached. Water through to insulation cavity.
· Garden bed retaining beds. Pebble and mulch displaced into stormwater drains.
· Adjacent vehicles. Chemistry overspray damages paint — cover or move them.

Water restrictions and recycled water

Australian water restrictions vary by region and season. Some councils ban pressure cleaning of hard surfaces in drought-restricted periods — the operator should know your local rules.

Water-efficient operators

Modern professional units recycle water on-site, use tank-supplied water (not the mains), and feature reclaim systems. Drives up cost by ~$50/job but compliant with all restriction levels.

Stormwater protection

EPA requirement in NSW, VIC, QLD: drain blocks placed over stormwater pits during work. Wastewater vacuumed and disposed at trade waste facility. Ask operator about this directly.

Sealing after — the step most skip

A clean concrete or paver surface is also an unprotected one. The pores are open and ready to absorb whatever lands next — oil, leaf tannins, tyre marks. Sealing within 7 days of cleaning preserves the result and extends the cycle.

· Concrete sealer: $8–$18/m², lasts 3–5 years
· Paver enhancer + sealer: $14–$22/m², also stabilises joint sand
· Timber decking oil: $12–$20/m², annual recoat
· Roof tile sealer: usually packaged with the clean

Maintenance schedule & resealing cycle

· Year 0: Initial clean + seal
· Year 1: Light wash, no chemistry needed
· Year 2: Light wash, biocide on shaded areas
· Year 3: Full clean + reseal (depending on traffic)
· Year 5+: Strip and reseal cycle restarts

The toolkit

Use these before you sign.

The four components below apply to every Australian trade contract. The trade-specific sections above add the layer on top.

39 homeowner quotes · Reg State trade regulator + work-safety regulator · AS AS 4361 · 9 operator quotes · Last reviewed June 2026

Quote anatomy

What a real quote should contain

Operator + ABN

Full legal name + active 11-digit ABN

Verify on the Australian Business Register before paying any deposit. If the ABN isn't active, the contract has no enforceable counterparty.

State trade licence

Licence number + class on the quote

Cross-check on the relevant state regulator (linked in the glossary licence-check section). Confirms they can legally do the work.

Public liability insurance

$10–20 million cover, still current (not expired)

This is what pays if they damage your home — or a neighbour's — or someone is injured during the job. Ask them to email you the insurance certificate; "I'm covered, mate" is not proof.

Workers' insurance

In place if they bring any workers onto your property

If a worker is hurt on your property and the operator has no workers' insurance, you can be the one left liable. A genuine sole trader with no employees may not need it — just ask.

Itemised scope of work

What's included, what's not, line by line

"Standard installation" means nothing in court. Specific scope items are what get enforced.

Materials specification

Brand, grade, quantity, AS standard where applicable

Prevents the "we used what was on the truck" substitution that turns up under failure inspections.

Variations clause

How changes get priced + agreed, in writing

No written variation = unenforceable. Verbal "we'll work it out" is how budgets blow out by 40%.

Deposit + progress

Within your state's legal cap (e.g. NSW 10%; VIC 10%/5% by threshold; QLD tiered 20%/10%/5% by job value)

Above-cap deposits are illegal. Caps differ by state — check your state's current regulator guidance. Progress payments should align with completed stages, not arbitrary dates.

Warranty terms

Workmanship period + manufacturer warranty pass-through

Statutory warranty applies regardless, but written terms accelerate enforcement.

Completion definition

What "practical completion" means for this job

Triggers final payment + starts the defects liability period.

Dispute path

Named regulator/tribunal for disputes (e.g. NCAT, VCAT, QCAT)

Knowing the path before signing makes you a less attractive target for a dispute.

If a quote you receive is missing any of these, ask for them before you sign or pay a deposit.

The working operator vs the cowboy

Where

✓ Working operator

✗ Cowboy

Quote

Written, itemised, with named scope + exclusions. Numbered + dated.

A number on a text. "I'll do it for $X."

Licence

Licence number on the quote; matches the name on the state register.

"I'll send the licence later." Never does.

Insurance

Emails you the insurance certificate the same day you ask.

"I'm insured, mate." Never actually sends the certificate.

Deposit

Within statutory limit. Held in their account, receipted.

Asks for cash up front. Above the legal limit.

Variations

Written. Cost + time impact. You sign before work changes.

Verbal "we'll sort it out". Surprise invoice at the end.

Warranty

Written workmanship period. Manufacturer cert handed over.

"My word's my warranty." No paper.

References

Three recent jobs with photos + contact for past clients.

"All my reviews are on Google."

Clean-up

Final clean defined in scope. Photos taken at handover.

Site left messy. Promises to "come back tomorrow".

State-by-state contract compliance

Choose your state:

NSW WHS duties

Regulator

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Common gotcha