Pressure is for concrete. Everything else is negotiation.
Water blasting is the right tool for exactly one category: hard, unpainted surfaces. Driveways, paths, pavers and patios, especially the shaded south-facing strips where Wellington's damp grows a slip hazard by mid-winter. The difference between a good job and an expensive one is pressure matched to the surface, a post-treatment to slow regrowth, and runoff that does not end up in the harbour.
Is this your stream?
Slippery paths, a mossy driveway, oil-stained concrete, a tired patio before summer, or a commercial frontage that has gone grey. Pressure is the correct and fastest tool here.
Painted weatherboards, plaster and anything coated belongs in soft wash. Moss and lichen on the roof is roof treatment. High pressure on either is damage, not cleaning.
What water blasting costs in Wellington
A quote-based market priced by area, condition and access. Structure beats guesswork.
Per area, quoted
Driveways and paths are quoted by square metre or as fixed prices after inspection. Minimum charges apply to small jobs, which is why bundling surfaces or pairing with a house wash usually improves the maths.
Save from $100
Prowash Wellington advertises package deals saving from $100 when services combine, and Metro's Wellington guide prices full exterior packages at $600 to $1,000+. If the house, paths and gutters are all due, quote them together.
Condition + access
Heavy moss, oil staining, steep driveways, poor drainage and distance from the truck all move the number. A flat, open double driveway is the cheap end; a stepped hillside path network is not.
Wellington water blasting providers, compared
Franchise benchmarks, pressure-and-treatment locals and bundle operators. Hover a row for the detail that matters.
Choose by situation
Clear Water Blasting has cleaned Wellington exteriors since 2001 and reserves high pressure for concrete, pavers and asphalt by policy. Top Notch picks pressure, soft wash or manual scrubbing per surface. That judgement is the service.
PowerPro applies a post-treatment after blasting to slow mould and algae regrowth. Ask every quoter whether post-treatment is included, because it is the difference between an annual and a biennial job.
Prowash Wellington advertises package deals saving from $100, and Manta Wash covers driveways, decks, fences and house washing from one crew. One truck, one callout fee.
Top Notch Housewashing and Metro both run commercial building and hard-surface work, with regular wash programs available. For a shopfront or office entrance, ask about scheduled cleans rather than one-offs.
Common mistakes
Blasting painted or timber surfaces: 2,500-plus PSI strips paint, gouges decking timber and forces water where it should never go. Water blasting is for concrete, pavers, asphalt and robust paths. The house itself belongs to the soft wash stream.
Skipping the post-treatment: blasting removes the visible mould but leaves spores in the concrete pores. Operators like PowerPro apply a post-treatment to slow regrowth. Without it, the black film returns within a damp Wellington winter.
Ignoring where the runoff goes: blasting lifts years of grime, detergent and sometimes moss chemicals, and Wellington street drains feed the harbour. On sloped driveways, ask how runoff is managed before it becomes your neighbour's problem or the council's.
Blasting old concrete too hard: aged concrete and exposed aggregate can lose their surface cream under aggressive pressure, leaving a rough, patchy finish that holds dirt faster. Correct pressure per surface is the skill you are paying for.
Doing it before the moss treatment: if the paths are mossy, a treatment first and a blast weeks later gives a cleaner, longer result. Blasting live moss just spreads it. Ask the operator which order they recommend for your surfaces.
Forgetting the slip hazard window: a freshly blasted path stays slick for a day or two as remaining film lifts. On steep Wellington driveways and shared accessways, warn the household and the neighbours.
FAQ
How much does water blasting cost in Wellington?
Wellington water blasting is a quote-based market, priced by square metres, condition and access. Metro Water Blasting publishes Wellington cost guides for its services and quotes free on 0800 997 997, which makes it a useful first benchmark. As a structure: small paths and patios are often quoted as minimums, driveways by area, and bundles with a house wash reduce the per-surface cost.
What surfaces should be water blasted?
Concrete driveways and paths, pavers, asphalt, patios and robust stone: the hard, unpainted stuff. Not weatherboards, not plaster, not decking timber (unless the operator drops pressure dramatically), and never roofs. Clear Water Blasting states it plainly: high pressure for hard surfaces, soft wash for everything painted.
How often do Wellington paths need blasting?
In shade and damp, expect mould and algae film within a year, especially on south-facing paths and anywhere under trees. With a post-treatment after blasting, operators aim to stretch that interval. Sun-exposed concrete can go two to three years. The honest answer is: when it gets slippery, it is already overdue, because the film was visible months before it was dangerous.
Is water blasting bad for the environment?
The water itself is fine; what it carries matters. Grime, detergents and treatment chemicals washing into stormwater drains end up in Wellington Harbour. Reputable operators manage runoff and use biodegradable treatments. If your driveway slopes to the street drain, raise it when quoting.
What should I ask before booking?
List the surfaces and approximate areas, and mention moss, oil stains and drainage direction. Ask what pressure and treatment will be used per surface, whether a post-treatment is included, how runoff is handled, and whether bundling with a house wash or gutter clean changes the price. Get the square-metre rate or fixed price in writing.
Water blasting belongs on concrete, pavers and paths, full stop. Get it quoted by area, insist on a post-treatment so the mould does not return by spring, and ask how runoff is handled on sloped driveways. Metro for the published-guides franchise, Clear Water Blasting for surface judgement since 2001, PowerPro for the regrowth treatment, Prowash or Manta for bundles. And keep the blaster off the weatherboards, whoever you book.