Why insurance matters when hiring a waterproofer Waterproofing is one of those jobs where mistakes can be expensive and hard to spot straight away. A failed membrane in a bathroom, deck or balcony might not show up until there is leakage, rot, mould, damaged linings, or even structural issues. In New Zealand homes, that can mean costly repairs and insurance headaches later on.
A properly insured waterproofer gives you a layer of protection if something goes wrong during the job or if their work causes damage after completion. It is not just about peace of mind — it is about making sure there is a clear path to compensation if the tradesperson, their subcontractor, or their work is at fault.
The main types of insurance a waterproofer should carry Not every waterproofer will carry the same cover, but these are the key types worth asking about.
| Insurance type | What it usually covers | Why it matters to you | |---|---|---| | Public liability insurance | Injury to other people and damage to third-party property | Protects you if the work causes accidental damage to your home, neighbouring property, or a visitor is injured | | Contract works insurance | Damage to the job while it is in progress | Useful if a storm, fire, theft, or accidental damage affects materials or partly completed waterproofing | | Professional indemnity insurance | Errors in advice, design, or specification | Important if the waterproofer recommends the wrong membrane or system, leading to future failure | | Statutory liability cover | Defence costs and penalties from unintentional breach of certain laws or regulations | Can matter where compliance issues arise during a job, depending on the policy | | Tools and equipment cover | Theft or damage to the tradesperson’s tools | Doesn’t directly protect you, but helps them keep the job moving if gear is stolen or damaged |
Public liability: the cover homeowners should ask about first Public liability insurance is the most important policy to check for most homeowners. If a tradesperson accidentally damages your home, a neighbour’s property, or causes an injury while working, this is the cover that may respond.
For waterproofers, that can include scenarios such as: - water damage caused by a temporary failure during the job - a dropped bucket, ladder or tool damaging tiles, glass, or fixtures - a visitor slipping on a wet surface in the work area - accidental damage to adjacent rooms while preparing a wet area
This cover is especially important in older NZ homes, where a small mistake can spread quickly through timber framing, plasterboard and flooring. If the waterproofer is uninsured, you may end up relying on their personal assets — which can be far less practical than dealing with an insurer.
Contract works insurance: useful during the job itself Contract works insurance covers damage to the work while it is underway. It is not always compulsory, but it can be very helpful on bathroom renovations, decks, balconies and other jobs where the area is exposed.
A good contract works policy may help if there is: - storm or wind damage before the membrane is completed - theft of materials from site - accidental damage during installation - fire or other unexpected loss while the job is still in progress
This is particularly relevant in New Zealand’s changeable weather, especially in spring and winter when rain and humidity can delay curing times and expose open work areas. If a job is started and then interrupted, you want to know who is carrying the risk while the site is incomplete.
Professional indemnity: important when advice or specification is involved Waterproofing is not only about application. The tradesperson may also be advising on the right membrane system, substrate preparation, primer, fall, sealant compatibility, or whether a particular area is suitable for a wet-area solution.
Professional indemnity insurance can help if the waterproofer gives incorrect advice or a design/specification error causes a loss later on.
This matters most when: - the job involves a complex bathroom, balcony or deck - the waterproofer is also specifying the system - the waterproofing forms part of a larger renovation with multiple trades - there is a dispute about whether the chosen product or method was suitable
Not every small applicator will carry professional indemnity cover, but if they are offering advice beyond simple installation, it is worth asking.
Don’t confuse insurance with licensing, consent, or guarantees Insurance is important, but it does not replace proper compliance.
In New Zealand, some parts of a renovation may be restricted or regulated work, and the rules vary by trade: - plumbing, gasfitting and drainlaying are restricted under the Plumbers, Gasfitters and Drainlayers Board (PGDB) - electrical work is regulated by the Electrical Workers Registration Board (EWRB) - building work may need a building consent from the local council, depending on the scope and whether exemptions apply
Waterproofing itself is often part of building work, especially in wet areas, but the exact consent requirements depend on what is being done and where. For example, a bathroom renovation that changes plumbing, drainage, structure, waterproofing details, or a shower installation may trigger consent requirements.
Do not rely on a tradesperson saying, “We always do it this way.” Ask what standards, product instructions, and consent requirements apply to your project.
Also note that an insurance policy does not guarantee a good outcome if the work is poorly done or the wrong materials are used. You still need a qualified, experienced tradesperson and a clear written scope of work.
How insurance protects the homeowner in real life If your waterproofer is properly insured, you are in a much better position if problems arise. Insurance can help with:
- paying for accidental damage during the job - covering damage caused to neighbouring property - handling claims for injury on site - funding repairs if the tradesperson’s work causes a loss and the policy responds - reducing the chance that you have to chase payment personally
That said, insurance claims take time and can involve excesses, exclusions and disputes over causation. The cover is only useful if the policy is current, adequate for the value of the work, and relevant to the type of job.
What to ask before you hire Get written quotes from at least two or three waterproofers, and ask the same questions of each one. A good professional should be comfortable answering.
Ask: - What insurance do you carry? - Can you provide a current certificate of currency or insurance confirmation? - What is the policy limit for public liability? - Does the policy cover subcontractors, if you use them? - Do you have contract works cover for jobs in progress? - Do you have professional indemnity insurance if you are advising on system selection? - Are there any exclusions I should know about? - Are you licensed or qualified for any related work you will do on site?
A tradesperson who refuses to answer, gives vague replies, or says they “don’t bother with paperwork” is a red flag.
How to confirm the cover is real Do not just take someone’s word for it. In New Zealand, the practical way to check is to ask for documentary proof.
Look for: - the insurer’s name - the policy number - the effective dates of the policy - the insured entity name matching the business you are hiring - the cover type and limit - any exclusions or special conditions
A certificate of currency is common, but it is not a substitute for reading the actual policy wording if the job is large or high-risk. If your project is a major renovation, it is reasonable to ask for a copy of the relevant schedule or a summary from their broker.
Also make sure the business name on the invoice matches the name on the insurance certificate. If the quote is from one entity but the work is done by another, you need to know who is actually covered.
Insurance claims and warranties: what else should you check? Insurance is only one part of your protection. You should also ask about:
- workmanship warranty or guarantee, and what it covers - product warranties on membranes, primers and sealants - who is responsible if another contractor damages the waterproofing later - whether the waterproofer will provide photos or documentation of the prep and installation stages - whether they will follow the product manufacturer’s instructions and relevant NZ standards
For waterproofing, documentation matters. Photos of substrate preparation, membrane application and critical detailing can be valuable if there is a dispute later, or if another trade needs to work nearby.
The red flags to watch for Be cautious if a waterproofer: - cannot produce proof of current insurance - says insurance is “not necessary” for small jobs - gives a price far below the others without explaining why - cannot explain the system they plan to use - suggests skipping consent or ignoring manufacturer instructions - wants most of the payment upfront before any work starts
A low quote is not a bargain if there is no cover and the work fails. In waterproofing, the cost of fixing a leak can be far higher than the original job.
Practical advice for NZ homeowners Before you sign anything, make sure you have: - a written quote with scope, materials and exclusions - confirmation of the insurance types and policy limits - proof of any relevant licences or competencies for related work - clarity on whether council consent is needed - a start date that reflects weather conditions and drying times
In New Zealand, the best time for some external waterproofing jobs is not necessarily the soonest date available. Cold, wet, or highly humid conditions can affect curing and scheduling, so ask how the tradesperson plans to manage weather delays.
Bottom line Yes — your waterproofer should be insured, and you should not treat insurance as optional paperwork. At minimum, ask for public liability cover, and for larger or more complex jobs, check whether they also carry contract works and professional indemnity insurance.
Confirm the cover before work starts, keep all paperwork, and compare multiple written quotes. Combined with proper licensing checks, council consent where required, and a clear contract, insurance is one of the simplest ways to reduce the risk of a costly waterproofing mistake.