Window Repair
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Window repair in Australia is mostly a hardware and seals trade rather than a glass trade. Aluminium framing dominates the housing stock, so the things that fail first are the parts that move or that touch the weather: rollers and tracks on sliding sashes, winders on awning windows, latches and restrictors, perished rubber and wool pile seals, blocked drainage slots in the sill, and insect screens. On timber joinery it is the bottom rail and the sill that go, wherever a paint film failed on the weather side.
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Broken glass is the other half of the job, and it is the half with rules attached. Glass used in a building has to be of a type within the scope of AS 1288, and in doors, in panels beside doors, in low-level glazing and in bathrooms the code calls for Grade A safety glazing material rather than ordinary annealed glass. Safety glazing carries a permanent etch or label naming the standard, the manufacturer, the grade, the thickness and the type of glass, so you can check afterwards what was actually fitted.
Repairs are often below the value threshold at which your state requires a licensed contractor, which makes it tempting to skip the checks. The Australian Consumer Law still applies to the work, and a repair that touches a restrictor, a safety glazing position or the weatherproofing around the opening is not a small job just because the invoice is small.
What usually goes wrong with Australian windows
- Sliding sashes that grind, jump or need two hands, almost always worn rollers or a track that has corroded or been dented.
- Awning and casement winders that slip, seize or no longer pull the sash tight onto its seal.
- Sill drainage slots blocked with dust, paint or insect nests, so water that has drained into the frame as designed has nowhere to go and appears indoors.
- Perished wool pile and rubber seals that have gone hard and no longer touch the sash, which shows up first as wind noise.
- Latches, locks and restrictors that have corroded solid, snapped, or been removed and never refitted.
- Insect and security screens with stretched mesh, split spline or frames that have pulled out of square.
- Fogging or a tide mark between the panes of a double glazed unit, meaning that unit's seal has failed.
- Rot in the bottom rail, the sill or the reveal of timber joinery, and flaking paint on the weather side that let it start.
Broken glass: making the opening safe and getting the right glass back in
Treat a broken pane as a hazard first and a repair second. Keep people and pets out of the room, do not try to pull loose shards out of the frame, and let the glazier remove the remaining glass with the right gloves and a plan for disposing of it. If the opening has to be left overnight, a proper board-up is safer than tape and cardboard, and it also matters for an insurance claim that the house was secured.
Photograph the damage before anything is cleaned up if you are likely to claim, including the frame and what caused it, because an insurer will usually want to see the state of the opening rather than a clean hole.
Then insist on the right replacement glass. It must be of a type within the scope of AS 1288, and the position decides the grade: glass in a door needs Grade A safety glazing material, an unframed glass door calls for toughened safety glass of at least ten millimetres nominal thickness or laminated toughened glass, framed glass within three hundred millimetres of the edge of a doorway opening needs Grade A unless the lowest visible sight line is more than one point two metres above the floor, and glazing whose lowest sight line is less than five hundred millimetres above the floor is treated as low-level glazing. In a bathroom or ensuite the threshold is a sight line less than two metres above the floor. When the job is done, look for the etch or label on the new glass.
Repair, re-glaze or replace the whole window
Three different jobs get quoted against the same complaint, and the right one depends on what has failed. A repair renews the moving and wearing parts inside a frame that is still straight and watertight. A re-glaze changes the glass or the insulated unit and leaves everything else alone. A replacement takes out the frame, which means touching the flashings, the reveal and the external finish.
Choose repair when the frame is sound and the parts are available, and be aware that hardware availability is the usual limit: proprietary rollers and winders from a discontinued system may have no equivalent, and at that point a sound-looking frame becomes a replacement anyway. Choose a re-glaze when the frame is fine but the glass is broken, fogged, or not the grade the position requires.
Move to replacement when the frame is corroded through or rotten beyond repair, when water is entering through the installation rather than the window, or when the opening cannot meet what the site now demands for wind, bushfire or child safety. Ask the repairer to say plainly which of the three they are quoting, because comparing a repair against a replacement on price alone tells you nothing.
What a repair visit should cover, including the restrictors
A competent repairer starts by working out where the water or air is actually coming from before touching anything. They should operate every sash, check that the frame is still square, look at the sill drainage path, feel along the seals, and ask when the problem appears: in driving rain, in wind, or all the time. A window that leaks only when the wind drives rain against that elevation is usually a flashing or installation problem rather than a fault in the window.
If the repair involves an openable window upstairs, the child safety provisions have to be put back. Where the floor below the window is two metres or more above the surface beneath, the opening must be restricted or screened against a one hundred and twenty five millimetre sphere and resist an outward horizontal action of two hundred and fifty newtons, with a barrier required as well where the device can be removed without tools. Removing a stiff restrictor to make a window easier to open is not a repair, and it is exactly the shortcut to refuse.
Finally, ask what the visit does not cover. A repairer who replaces a roller but cannot get at a corroded track, or who reseals a sash but can see the reveal is wet, should tell you so in writing rather than leave you thinking the problem is solved.
Keeping windows working in Australian conditions
- Rinse frames, tracks and hardware with fresh water in coastal areas, since salt deposits are what kill fasteners and rollers early.
- Clear the sill drainage slots with a soft brush a couple of times a year, and never paint over them.
- Vacuum grit out of sliding tracks before it grinds the rollers, and use a lubricant suited to the hardware rather than a general spray oil.
- Check seals by closing the sash on a strip of paper: if it pulls out freely all round, the seal or the latch adjustment has gone.
- Re-coat timber on the weather side before the film cracks, because rot starts at the joints and the bottom rail.
- Check screens and their fixings before summer, and look at gaps around frames before the fire season if you are on bushfire prone land.
- Test every restrictor and lock, on every storey, once a year, and get failed ones fixed rather than removed.
Condensation, storms and the inverted calendar
In the cooler zones the winter complaint is water running down the inside of the glass through June, July and August, then soaking into timber reveals and sills where it causes the rot that surfaces years later. Condensation is a moisture and ventilation problem more than a window fault, which is why the code approaches it through extraction: a minimum flow rate of twenty five litres per second for a bathroom or sanitary compartment and forty litres per second for a kitchen or laundry, discharged directly to outdoor air, with a run-on timer keeping the fan going for ten minutes after the light is switched off where a bathroom has no natural ventilation, and make-up air provided from an adjacent room.
Summer and the northern wet season bring the opposite work. Before storm season, check that sashes latch properly, that screens and any shutters are sound, and that sill drainage is clear, because a blocked drainage path turns ordinary rain into water on the floor.
On bushfire prone land, the pre-season check is about gaps rather than glass: seals, screens and the junction between frame and wall, since embers find openings long before flames arrive. Do it before your district's fire season, not when there is smoke on the horizon.
When a window repair becomes licensed work
Most small repairs fall below the value at which a state requires a licensed contractor, but the line is about value and type of work, not how minor it feels. New South Wales licenses glazing work, described as installing glass, acrylic or other like materials in prepared openings such as windows, door panels, screens, fences, balustrades or partitions, and extending to fabricating and installing framing supports and installing prefabricated windows, once the combined labour and materials value passes the threshold in the Home Building Act 1989. Queensland requires a QBCC licence for building work above its threshold and tells homeowners to ask to see the licence card or its digital equivalent.
That threshold is per contract, so a house-wide repair round can cross it even when each window would not. If a repairer proposes splitting one job into several invoices, treat that as a warning rather than a convenience.
LokalMatch helps at the point where you are trying to find someone who does this specific work. Describe the fault once, with the frame material, what the window does when you operate it, when the leak or draught appears and how many windows are affected, and matched repairers and glaziers contact you. Those businesses pay for the requests they receive. LokalMatch does not carry out repairs, does not set or quote prices, and does not vet, rank or recommend anyone, so the licence check and the insurance check stay with you.
Your rights when a repair does not hold
Even a small repair is a service supplied to a consumer, so the Australian Consumer Law guarantees apply: it must be provided with due care and skill, be fit for any purpose you made known, and be supplied within a reasonable time when none was agreed. Any parts fitted are goods, which must be of acceptable quality.
Because window leaks are argued about more than most repairs, put the purpose in writing before the visit. An email saying that the aim is to stop water appearing on the sill in wind-driven rain is worth more later than a verbal description, and it also focuses the repairer on diagnosis rather than on the cheapest plausible part.
Ask what the workmanship warranty covers and how a return visit is triggered, and keep the invoice with the description of the parts fitted. If the same window fails the same way in the next storm, that is the record that turns a disagreement into a straightforward claim.
Window Repair: frequently asked questions
Can any glass go back into a broken window?
No. Glass has to be of a type within the scope of AS 1288, and the position decides the grade: doors, panels beside doors, low-level glazing and bathroom glazing generally call for Grade A safety glazing material. Safety glass carries a permanent etch or label stating the standard, manufacturer, grade, thickness and type, so check the new pane before the glazier leaves.
Water only comes in when it is windy. Is the window faulty?
Usually not. A leak that appears only in wind-driven rain against one elevation more often points to the flashings or the installation than to the window itself, and the NCC treats the openings around windows and doors as part of the wall's weatherproofing rather than as the window's problem alone. Ask for the drainage path and the flashing detail to be checked before any unit is condemned.
My sliding window is heavy to open. Does it need replacing?
Rarely. Heavy sliders are nearly always worn rollers, a dented or corroded track, or grit in the track, and all three are serviceable. Replacement becomes the better answer when the frame is corroded through, when the parts for that system no longer exist, or when the window is letting water in through the installation.
Can I take the restrictor off a window that is hard to open?
Do not. Where the floor below an openable window is two metres or more above the surface beneath, the opening has to be restricted or screened so a one hundred and twenty five millimetre sphere cannot pass, and resist an outward action of two hundred and fifty newtons. If the restrictor is stiff or broken, have it repaired or replaced with a compliant device rather than removed.
Why do my windows stream with water on winter mornings?
That is condensation forming on cold glass in a room with more moisture in the air than it can hold, which is common through June to August in the cooler climate zones. The lasting fixes are extraction and ventilation rather than wiping the glass, and the code sets minimum exhaust flow rates for bathrooms, kitchens and laundries with discharge to outdoor air for exactly this reason.
Do I need a licensed contractor for a small window repair?
Often not, because states set a value threshold below which a licence is not required, and many single repairs sit under it. Watch the total, though: a whole-house repair round is one contract and can cross the threshold, and glazing is a licensed trade in its own right in New South Wales above that value.
Sources
- NCC: ABCB Housing Provisions Part 8.4 Glazing human impact
- NCC: ABCB Housing Provisions Part 8.3 Glass (AS 1288)
- NCC: ABCB Housing Provisions Part 10.8 Condensation management
- NCC: ABCB Housing Provisions Part 11.3 Barriers and handrails (protection of openable windows)
- NCC 2022 Volume Two Part H2 Damp and weatherproofing (openings around windows and doors)
- NSW Government: Glazing work licences
- QBCC: Who must hold a QBCC licence
- ACCC: Consumer guarantees
Written by the LokalMatch editorial team. Last reviewed 14 September 2026. How we write and check our guides
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What affects the cost of window repair
Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:
- Number, size and style of windows or doors
- Frame material and glass options
- Full-frame replacement or insert
- Repairs to rotted framing or sills
- Interior and exterior trim and capping
- Access, including upper floors
How to compare window repair technicians before you hire
- Look for an installer who measures on site and explains how the new window or door will be sealed and flashed.
- Ask whether the quote is for a full-frame replacement or an insert, and why they recommend it.
- Compare quotes on the same product type, glass options, installation method and interior and exterior trim.
- Ask who handles warranty issues: the installer, the manufacturer or both.
- For garage doors, choose a technician trained on springs and openers, since that work can be dangerous.
Questions to ask window repair technicians before you hire
- Will you replace the full frame or install an insert, and what's the difference for my home?
- How will you insulate and seal around the new units?
- Is interior and exterior trim included in the price?
- What does the manufacturer's warranty cover, and what does your installation warranty cover?
- How long will it take for the products to arrive once I order?
- Will your own crew do the installation?
When to call a pro for window repair
- Drafts, condensation or fog between the panes
- Windows or doors that stick, won't lock or let water in
- A garage door that's off track or has a broken spring: don't try to force it, and call a garage door technician.
Window repair permits and local rules
Some window repair work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.
Permits and licensingGuides about window repair
- ✦
Window & Door Contractors guide
Windows do more work in an Australian house than almost any other element. They are the main path for summer heat coming in and winter warmth going out, they are the part of the wall most likely to leak in driving rain,…
Read guide - ✦
Window Installers guide
Putting a window into an Australian house is regulated at three separate points, and a good installer can tell you which rule applies to which part of the job.
Read guide - ✦
Window Replacement guide
Most Australian homes reach a point where patching the windows stops being worth it: aluminium frames pitted by salt air, timber sashes gone at the bottom rail, hardware nobody makes any more, or glass that would not be…
Read guide
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