House Washing Services in NZ: Complete Guide

House Washing Services in NZ: Complete Guide

House washing is not a licensed occupation in New Zealand. There is no register, no protected title, and no certificate to ask for. That is worth knowing before you start ringing around, because the question most homeowners ask — "are you qualified?" — is not the question that protects them.

The question that does is about method. A water blaster removes whatever you point it at, and on a New Zealand house the thing underneath may be asbestos cement, brittle plaster, or a paint system that was the only thing keeping water out. Get the method wrong on an older home and you have not cleaned it, you have started a weathertightness problem.

There is also a legal pair almost nobody mentions. ACC covers a contractor's personal injury, so the fear of being sued by someone who falls off your roof is largely answered. What is left is property damage — and the defence you have is being able to show you picked someone competent.

How We Researched This Guide

We worked from the regulatory sources rather than from industry marketing. The asbestos rules come from WorkSafe's guidance for painters working with or near asbestos, and from the Health and Safety at Work (Asbestos) Regulations 2016. The working-at-height hierarchy is WorkSafe's, and the two-metre threshold sits in regulation 27 of the General Risk and Workplace Management Regulations 2016, set out in full on legislation.govt.nz.

Two things surprised us. First, the ACC bar in section 317 of the Accident Compensation Act 2001 means a contractor injured on your property generally cannot sue you — the exposure that remains is property, not people. Second, we found no published New Zealand figure for how many homes contain asbestos. The guidance is expressed as a presumption for pre-2000 buildings, so we have kept it that way rather than inventing a percentage.

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The Quick Summary (60-Second Version)

If you read nothing else, read this:

• House washing is unregulated — there is no licence to check, so check method, insurance and competence instead.
• On a home built before 2000, assume asbestos cement may be present in cladding, soffits or roofing until someone establishes otherwise.
• Water blasting asbestos cement is the opposite of the WorkSafe method, which is low-pressure wet cleaning with the material kept damp.
• The personal-injury fear is covered by ACC; the remaining risk is property damage, which public liability insurance answers.
• Ask how they reach the second storey — pole, scaffold or platform is a good answer; a ladder resting on a gutter is not.
• A quote far below the others usually reflects a higher-pressure, faster method, which is exactly the variable that matters on an older home.

Why "Are You Licensed?" Is the Wrong First Question

We are not being clever. There genuinely is no house washing licence in New Zealand, no register and no protected title. So a homeowner who opens with that question gets a shrug, and learns nothing about whether the person quoting is going to damage their house.

The substitute checks are the usual ones for an unlicensed trade: a company registration, evidence of public liability insurance, references from recent local jobs, and a written quote. The absence of a licence scheme does not mean there is no way to check anyone. It means the checks are yours to run.

What Actually Regulates the Job

Two bodies of law do the real work here, and neither is occupational licensing. The first is the working-at-height hierarchy. WorkSafe's guidance requires controls to be applied in order: eliminate by working from the ground, isolate with scaffolding or edge protection, minimise with a restraint system. Fall arrest is second-to-last, not first.

Under regulation 27, if a person could fall two metres or more, the business must provide a fall prevention system, a work positioning system, a fall arrest system, or a compliant ladder. A single-storey gutter line sits above that threshold. So the practical question is not whether your washer is licensed — it is whether they are working from a ladder, and if so, why.

The second is the asbestos regime, and that is where the real risk sits. We will come to it.

Asbestos, Weathertightness and the Method Question

Buildings built before 1 January 2000 are likely to contain asbestos-containing materials. Cladding, soffits, fascia and roofing are among the places asbestos cement appears, and it can sit under later layers of paint. That is a presumption, not a percentage — no reliable New Zealand figure is published, and we are not going to make one up.

WorkSafe's information sheet on painting asbestos cement is explicit that you must not use overly forceful methods when preparing, repairing or cleaning the surface — no sanding, no wire brushes, no harsh scraping. Low-pressure wet methods, with the material kept damp, is the standard. Water blasting an asbestos cement surface is the opposite of that. It is forceful, uncontrolled, and produces run-off carrying fibrous material onto the ground, the garden and the driveway.

The Asbestos Regulations 2016 also restrict power tools on asbestos work. Angle grinders, sanders, saws, drills, brushes and brooms may only be used on asbestos if the specific regulatory requirements are met.

The Weathertightness Risk on Plaster and Monolithic Cladding

External moisture is dealt with in clause E2 of the Building Code, and weathertightness is one of the highest-risk areas of the Code. A monolithic or plaster-clad home from the leaky era depends on the integrity of its coating system. Cracked or unsealed plaster, or a coating that has already failed, becomes an entry point when water is driven at it under pressure.

Water behind a cladding is not a cleaning problem. It is the start of a weathertightness problem, and it may not show up for years.

What a Careful Operator Does Differently

Insurance, ACC and What You Are Actually Exposed To

Under section 317 of the Accident Compensation Act 2001, no person may bring proceedings for damages arising directly or indirectly out of personal injury covered by the Act. In plain terms: if a washer falls off your roof and is injured, their injury is covered by ACC and they generally cannot sue you for it. Claims relating to property damage, and claims under an express contract term, are not blocked.

That inverts the usual fear. The exposure that remains is your cladding, your windows, your garden, your neighbour's car — and the thing that protects you there is having picked a competent contractor and being able to show you did.

Under the Occupiers' Liability Act 1962, where damage is caused by the faulty execution of work by an independent contractor, the occupier is not treated as answerable without more if they acted reasonably in entrusting the work to that contractor and took such steps as they reasonably ought to satisfy themselves the contractor was competent and the work properly done.

So the paperwork is not a formality. Asking about public liability insurance, checking the company, and keeping the answer is precisely the defence the Act describes. Ask to see the certificate, and keep a copy.

Questions You Might Have

How much does house washing cost in New Zealand?

We are not going to give you a figure, because no reliable national pricing data exists and a made-up range helps nobody. What drives the price is the size and number of storeys, the cladding type, how much of the property is included, access, and how heavily soiled the surfaces are. The honest warning: a quote much cheaper than the others usually reflects a faster, higher-pressure method.

Should I get a soft wash or a pressure wash?

For the house itself, low pressure is the safer default, particularly on painted timber, plaster and anything pre-2000. Pressure washing suits hard, non-porous surfaces like concrete driveways. The method should be chosen for the material, not for the operator's convenience — and a quote should say which method applies to which surface.

What if my house was built before 2000?

Assume asbestos cement may be present in cladding, soffits, fascia or roofing until someone establishes otherwise. Ask the operator what they do if a surface looks like asbestos cement. A good answer describes low-pressure wet cleaning and leaving it intact. A bad answer involves a water blaster and a wire brush.

Do I need to be home while they work?

Not necessarily, but you should agree access, water supply and what happens to pets, alarms and gates beforehand. It is also worth photographing the condition of the area before work starts — it is free, takes two minutes, and removes a whole class of disputes about pre-existing damage.

What if the job damages my property?

Give the trader a chance to fix it first, and put the request in writing. If they refuse, or do not succeed within a reasonable time, you can have it remedied elsewhere and recover reasonable costs, or cancel the contract. The Disputes Tribunal handles claims up to $60,000 and is the practical end point.

What Matters Most

The single most useful thing you can do before booking a house wash is ask what method will be used on which surface, and what happens if the cladding turns out to be asbestos cement. That one question separates an operator who knows the rules from one who is going to point a high-pressure jet at a pre-2000 wall and hope.

Then get the insurance certificate and keep it. ACC answers the personal-injury fear, which leaves property damage as your real exposure — and the defence available to you is being able to show you chose someone competent and took reasonable steps. That is not bureaucracy. That is the protection.