Window Repair in Dunedin

That distinction matters more than any other decision on this website. A window repair usually costs a fraction of a replacement, and in Dunedin a very large share of the joinery people are told to rip out has decades left in it. There are the largest surviving collection of Victorian and Edwardian housing in New Zealand here, and the timber in those sashes is denser than anything sold today.

What actually fails on a Dunedin window

After a couple of thousand callouts the pattern is consistent. Six faults account for the overwhelming majority of what we are asked to look at, and only one of them involves the glass.

Friction stays and hinges

The stay is the hinged steel arm that carries an awning or casement sash and gives it the friction to hold open. When it corrodes or bends, the sash swings, drops or fouls the frame. Replacements are stocked in common sizes and the swap takes minutes per window. Within reach of the water at St Clair, St Kilda, Port Chalmers and Brighton we fit 316 marine grade stainless as standard, because ordinary stays pit within a few years in salt air.

Perished rubbers and weather seals

The glazing wedge holds the glass and the weather seal is what the sash compresses against. Both harden, shrink and take a permanent set. Once that happens there is a continuous air path around the sash even with the handle locked down. Re rubbering is the cheapest item we sell and it changes how a room feels the same evening.

Blocked drainage

Aluminium windows are designed to let a little water in and drain it back out through slots in the bottom of the frame. Block those with dirt, paint or dead insects and the water backs up over the internal sill. A good share of the leaking window callouts we attend are this, not a failed seal, and clearing them takes minutes.

Snapped sash cords

On a timber double hung window the sash hangs on cords running over pulleys to cast iron weights inside the box frame. When a cord snaps the sash drops and stays down. Nothing is broken, it is disconnected. New cord, the weight rebalanced, and it works as it did when the house was built.

Rot in the sill and bottom rail

Timber joinery rots from the bottom because the sill holds water and the head sheds it. The rest of the frame is usually sound. We cut back to solid wood and scarf in new timber shaped to the original profile, which costs a fraction of replacing the joinery and keeps the original glass.

Dropped and racked sashes

A sash that catches at one corner or leaves a wedge shaped gap has almost never warped. It has dropped on worn hardware. Replacing the hinges, stays or rollers and rehanging it square closes the gap and usually fixes the lock at the same time.

How we work out what is wrong

Nearly every bad window repair we get called out to undo started with a guess. The most common is a bead of silicone run around the outside of a frame that leaks, which seals the drainage path and traps the water inside the wall.

Water testing, from the bottom up

Where there is a leak we wet the window in stages, starting at the sill and working up, masking off what has already been ruled out. It takes longer than looking at it and guessing, and it is the reason the repair holds.

Testing the lock with the sash open

If a latch throws cleanly in the air, the mechanism is fine and the problem is where the sash sits. If it binds with the sash out of the way, the lock has failed. That five second test decides whether the job is a lock replacement or a hardware and alignment fix, and the two cost very different amounts.

Probing timber before quoting it

Paint holds a shell over wood that has gone soft behind it, so a patch that looks 100mm across is often twice that. We probe the whole sill and up the jambs before quoting, so the price does not move once the window is open.

When we tell you to replace instead

We would rather do the smaller job properly than sell the bigger one, but there is a point where repair stops being the right answer and we will say so on the quote.

Aluminium that is pitting right through the extrusion. Timber that is soft through the full section rather than just at the face. Corner joints opened so far the frame is no longer square. uPVC gone chalky and brittle enough to crack when you screw into it. In those cases you get the replacement price alongside the repair price and the reasoning behind it, and you decide.

How Window and Glass Repair Dunedin diagnoses and repairs in Dunedin

Guessing at a cause is how people pay twice. Window and Glass Repair Dunedin finds the fault before quoting the fix, which sometimes means saying the problem is not the window at all.

1. Inspect the opening as one system

   Frame, sashes, hardware, seals and drainage all get checked together, because a fault in any of them presents identically from inside. Looking only at the obvious part is how the wrong repair gets sold.

2. Separate condensation from water ingress

   In a Dunedin winter this is the single most common diagnostic question. Water on the inside face of the glass, pooling on the sill, worse in the morning and worse in bedrooms, is almost always condensation. Water appearing after rain and tracking from the head is not.

3. Water test where ingress is real

   Controlled water on one zone at a time from the bottom up, with somebody watching inside. It takes an hour and it is the only reliable way to find an entry point rather than resealing everything and hoping.

4. Check the drainage before condemning a seal

   Aluminium frames let water in by design and drain it back out through weep holes in the sill. Blocked weeps present exactly like a failed gasket. Clearing them costs almost nothing, so it gets ruled out first.

5. Report the cause in writing

   You get told what failed, why, and whether it will recur. Where the cause is a head flashing, the cladding above or the way the room is ventilated, Window and Glass Repair Dunedin says so rather than quoting glazing work that cannot fix it.

6. Quote repair against replacement

   Where both are genuine options they go on the same quote with the reasoning. Most windows Window and Glass Repair Dunedin is called to do not need replacing, and you should be able to see the gap between the two numbers yourself.

7. Test again before leaving

   Every sash opened, closed, locked and checked for even seal compression. On a leak repair the opening is water tested a second time to confirm the fix.

Why window repair in Dunedin is its own problem

The housing stock and the climate here combine in a way that produces faults you do not see in warmer cities.

Old joinery that has already moved

A house that has stood since the 1890s has settled, and the openings have gone out of square with it. A sash that will not latch is very often a dropped or racked opening rather than a failed lock, and adjusting is far cheaper than replacing.

Student and rental housing gets harder use

A large share of the older stock is tenanted, which means more cycles on the hardware and more forced sashes. MBIE inspected fifty three Dunedin student rentals in May and June 2026, which gives some sense of how much attention this housing is getting.

Frost and damp accelerate everything

Around fifty ground frost days a year, and a lot of the older stock heated intermittently. Repeated wetting and freezing at the bottom rail is what turns a small paint crack into a rotten sill within a few seasons.

South Dunedin ground is a factor

On the flat, the water table sits close to the surface and moisture frequently rises from the ground rather than condensing from the air. Window and Glass Repair Dunedin checks that before quoting glass that would not fix it.

What window repair costs in Dunedin

Repair pricing looks unpredictable from outside because it depends entirely on what is actually wrong. These are the bands we quote within.

Diagnosis and call out

A standard assessment covers inspecting the opening as a system and giving you a written cause. Where water ingress is suspected, a controlled water test takes about an hour and is the only reliable way to find an entry point rather than resealing everything and hoping.

Hardware and seals

The cheapest end of this trade. Stays, rollers, catches, handles and gaskets are consumables and replacing them is a fraction of what people expect. Most windows Window and Glass Repair Dunedin is called to do not need replacing and the repair typically sits well under a tenth of a new unit.

Glass and sealed units

A broken pane runs $250 to $600 in a common size. A failed double glazed unit replaced in the existing frame runs $350 to $800. In both cases the frame and hardware stay, which is why repair usually wins on a sound window.

When replacement is the honest answer

Corrosion through the section, a frame distorted by building movement, or where the reason for the job is thermal performance rather than a fault. At that point a repair is money spent on a window you will replace anyway, and Window and Glass Repair Dunedin says so.

Repair or replace: how to decide in Dunedin

Four questions that settle it, in the order worth asking them.

Is the frame itself sound

Aluminium frames usually outlive everything attached to them, and timber frames are repairable far more often than they are replaced. If the frame is sound, almost everything else is a consumable and repair is the clear answer.

Is the complaint a fault, or is it the climate

Condensation running down the inside of the glass on a frost morning is not a fault. No repair fixes it and no reglaze fixes it. Ventilation, heating and thermal performance do, which is a different job with a different budget.

What is the whole of life number

A cheap repair on a window you will replace in three years costs the money twice. A repair on a window with twenty years left is the best value work in this trade. Window and Glass Repair Dunedin puts both numbers on the same quote so the gap is visible.

Is the house being sold or tenanted

On a rental, compliance and durability change the calculation, because the window has to keep working through harder use. On a house being sold, a documented repair is often enough and a full replacement rarely returns its cost.

Window Repair at a glance

Hardware

Friction stays, hinges, handles, catches, restrictors, rollers

Seals

Glazing wedge and weather seal, replaced in place on most windows

Timber

Scarf repair, bottom rail and full sill replacement, reglazing

Drainage

Slots cleared and water tested on every visit

Coastal spec

316 marine grade stainless within about 500m of the water

Diagnosis

Staged water testing before anything is sealed

Typical visit

Most repairs finished in a single visit