Why it pays to ask questions before hiring a glazier
Whether you need a cracked window replaced, a shower screen installed or custom glass fitted into a renovation, the right glazier can make a big difference to safety, finish and long-term value. In New Zealand, glass work is often part of wider building or renovation projects, so it is worth checking the glazier’s experience, insurance and process before you commit.
A good glazier should be happy to answer clear, practical questions. Their answers will help you compare quotes properly, avoid surprises and work out whether they are the right fit for your job.
Start with the scope of the job
Before you ask about price, make sure the glazier understands exactly what you need. Glass work can range from a simple pane replacement to specialist custom work involving showers, balustrades, splashbacks, mirrors or shopfronts.
Ask:
- What similar jobs have you done recently? - Is my job straightforward, or are there any complications you can already see? - Do you supply the glass, hardware and fixings, or do I need to organise anything separately? - Will you measure, make, deliver and install, or only part of the job?
If the job is part of a renovation, ask whether they are working from plans or need a site measure first. In many cases, a site visit is the best way to avoid ordering glass that is the wrong size or type.
Ask about experience and specialisation
Not every glazier does every type of work. Some mainly handle emergency breakages and home repairs, while others specialise in architectural glass, frameless showers, double glazing, heritage windows or commercial glazing.
Useful questions include:
- How long have you been working as a glazier? - What kind of glass projects do you specialise in? - Have you completed jobs like mine in New Zealand homes before? - Can you show photos of similar completed work? - Are you comfortable working with older villas, bungalows or new builds?
For heritage homes, older timber joinery and tricky window sizes can create extra labour and lead times. For new builds or renovations, ask whether they regularly work with builders, carpenters and joiners.
Check qualifications, licensing and compliance
A glazier does not need the same kind of registration as some other trades, but you still want to know they are competent and working to the right standards.
Ask:
- Are you qualified or trade trained? - Are you a member of any industry association? - Do you work to NZ Standards for glass installation and safety glass where relevant? - Will the glass you supply meet the required safety or performance standards for this job?
This is especially important for areas where safety glazing may be required, such as shower doors, low-level glazing, doors, balustrades and some areas near floors or stairs. The right glass type depends on the location and use of the glass.
If the work is part of a larger building project, remember that building work may need a building consent from your local council. The glazier may not be responsible for obtaining it, but they should be able to tell you whether the job is likely to need one or whether their work must integrate with a consented build.
It also helps to know what is not their area of responsibility. For example, plumbing, gasfitting and drainlaying are restricted work under the Plumbers, Gasfitters and Drainlayers Board, and electrical work is regulated by the Electrical Workers Registration Board. If your project includes heated towel rails, electric mirror demisters or other electrical fittings, those parts should be handled by the right licensed professional.
Ask what insurance they carry
Insurance is one of the most important questions to ask. Glass work can involve accidental breakage, damage to surrounding finishes or, in some cases, injury risk.
Ask:
- Do you have public liability insurance? - Are you insured for accidental damage during measurement, delivery and installation? - If the glass breaks before or during installation, what happens? - Do you have cover for working at height or on commercial sites, if relevant?
You should also check whether their insurance covers the kind of job you have. A glazier installing a simple window pane may have very different cover from one doing large-format or frameless glass work.
Get a detailed written quote
Never rely on a vague verbal estimate. Ask for a written quote that spells out exactly what is included and what is not.
A useful quote should cover:
| Item | What to check | |---|---| | Glass type | Clear, toughened, laminated, double glazing, low-e, obscure, mirrored, etc. | | Measurements | Who measures, and whether the quote is based on site measure or rough sizes | | Labour | Removal, installation, sealant, cleanup and any access equipment | | Hardware | Hinges, handles, channels, clips, brackets and fixings | | Disposal | Removal and disposal of broken glass or old frames | | Delivery | Whether delivery is included and how it is charged | | GST | Whether the quote includes GST | | Exclusions | Any items not included, such as repairs to rotten timber or painting |
Ask whether the quote is fixed-price or only an estimate. If it is an estimate, ask what could change the final cost.
Clarify pricing, deposits and payment terms
In New Zealand, prices can vary depending on glass type, urgency, location and access. A straightforward small repair may be relatively affordable, while custom or specialist glass can cost much more.
Ask:
- Is the price fixed once you measure, or can it change? - Do you require a deposit? - When is the balance due? - What payment methods do you accept? - Are there call-out fees for urgent or after-hours work?
Be cautious if a contractor asks for a very large upfront payment without a clear reason. For custom glass, a deposit is common because materials are ordered to measure, but it should still be explained clearly in writing.
Ask about timing, lead times and weather impacts
Glass work is often time-sensitive. If a broken window leaves your home exposed, you will want to know how soon the glazier can board it up, measure and return with replacement glass.
Ask:
- How soon can you inspect the job? - What is your current lead time for ordering glass? - How long will the installation take? - Will you give me a start date or just an approximate window? - What happens if bad weather affects the job?
Lead times can stretch during busy periods such as spring and summer, when renovation work ramps up. Before Christmas, many trades are booked out, so it is wise to organise quotes early. For outdoor or weather-exposed work, ask how rain, wind or cold temperatures could affect sealants, curing or site access.
Find out who will actually do the work
The person who quotes the job may not be the one who turns up on installation day.
Ask:
- Will you do the work yourself, or will a team member come instead? - Who will supervise the job on site? - Do you use subcontractors? - How do you make sure the installation is checked for quality?
This matters if you are relying on one person’s expertise or if the work involves delicate or high-value glass. You want to know who is responsible if something is not right.
Ask about guarantees and warranties
Good glaziers should stand behind their workmanship. Materials may also come with manufacturer warranties, especially for double glazing or coated glass.
Ask:
- Do you offer a workmanship guarantee? - What does it cover, and for how long? - Are the glass products themselves warranted by the manufacturer? - What is not covered, such as accidental damage, misuse or movement in the building structure?
It is important to separate workmanship issues from product defects. For example, a seal failure in double glazing may be a product issue, while a leaking shower screen might be an installation issue.
Check references and recent reviews
References are still one of the best ways to judge reliability. Ask for contact details for recent customers, or request examples of completed jobs similar to yours.
Ask previous customers or check reviews for:
- Was the glazier punctual and easy to deal with? - Did they communicate clearly about delays or changes? - Was the final result neat and professional? - Did they tidy up properly after the job? - Were there any issues, and how were they handled?
If the glazier is reluctant to provide references or has very limited evidence of past work, treat that as a warning sign.
Ask how they handle problems or defects
Even experienced tradespeople can run into problems. What matters is how they respond.
Ask:
- If the glass arrives damaged, what happens? - If measurements are wrong, who pays? - If I notice a defect after installation, how do I raise it? - How quickly do you respond to complaints or warranty claims? - Will you return to adjust or reseal work if needed?
A clear complaints process shows professionalism and helps you avoid disputes later.
Compare at least two or three written quotes
Don’t choose on price alone. A much cheaper quote may exclude key items such as site measure, removal, hardware, disposal or GST. A more expensive quote may include better glass, safer installation or a longer guarantee.
When comparing quotes, look for:
- exact glass specifications - whether the job includes measuring and templating - labour and installation details - warranty terms - estimated timeframes - payment terms
If one quote is much lower or higher than the others, ask why. Often the difference is in the details.
Red flags to watch for
Be cautious if a glazier:
- refuses to provide a written quote - won’t explain the glass type or installation method - asks for a large cash payment with no paperwork - has no recent references or examples of work - avoids questions about insurance or guarantees - promises unrealistically fast turnaround without checking the site
A professional glazier should be straightforward, specific and transparent.
Final checklist before you book
Before you confirm the job, make sure you have answers to these essentials:
- What exactly is included in the price? - Is the glass type suitable and compliant for the location? - Who is measuring, supplying and installing? - What insurance do they carry? - What is the expected lead time and install date? - What guarantee or warranty applies? - What happens if there is damage or a defect? - Can they provide references or recent examples?
If you can tick off those points, you are far more likely to get a smooth result and fewer surprises.
A good glazier will welcome these questions. They show that you are organised, informed and serious about getting the job done properly.