Window Repair Cost in Wellington: 2026 Price Guide

Wellington’s older housing stock means window problems here look a little different to the rest of the country. A large share of the city’s homes — particularly in Thorndon, Mount Victoria, Roseneath and other heritage-heavy suburbs — still have their original timber sash windows, decades older than the aluminium joinery common in newer builds. Add the region’s wind-driven rain and salt exposure, and windows across Wellington take a genuine battering. This guide covers what window repair actually costs in 2026, and when repair makes more sense than replacement.

Average Window Repair Costs in Wellington

Costs at the higher end of each range typically reflect windows above ground floor height, where scaffolding or specialist access may be needed, or heritage joinery requiring more careful, time-consuming work than standard modern aluminium.

What Affects the Cost of Window Repair in Wellington

Window type and age

Timber sash windows, common throughout Wellington’s older suburbs, are more labour-intensive to repair than modern aluminium joinery. Sash cords wear out and snap, timber can rot at the sill or lower rail where water pools, and old putty around the glass cracks and falls away over time, allowing water in behind the glazing. None of this is unusual for a window of this age — it’s the nature of the system — but it does mean repair costs and timeframes are generally higher than for an equivalent repair on a modern aluminium window.

The cause of the damage

A cracked pane from an isolated impact is usually the simplest and cheapest repair. Persistent condensation between the panes of a double-glazed unit indicates a failed seal, which typically means replacing the glazing unit rather than just the glass. Soft or spongy timber at the sill or lower frame usually points to a moisture problem that’s been present for a while — repairing this properly means addressing where the water is getting in, not just patching the visible rot, or the same repair will be needed again within a year or two.

Access and height

A ground-floor window is the most straightforward and cheapest to repair. Upper-storey windows, particularly on Wellington’s many two-storey villas and hillside homes, may need a ladder, specialist access equipment, or in some cases scaffolding, adding to the cost — the same access consideration that applies to exterior painting and roof work.

Number of windows

If several windows need attention, bundling the work into a single visit is almost always more cost-effective than calling someone back multiple times for individual repairs, since a large part of the cost of any small job is the setup and travel time, not just the repair itself.

Window Repair vs Window Replacement: When to Choose Which

Repair is usually the right call when the problem is isolated — a single cracked pane, one worn sash cord, hardware that’s failed, or localised timber rot that hasn’t spread through the frame. It’s also often the only sensible option for heritage villas in character-protected areas, where replacing original timber joinery with modern aluminium may not be straightforward from a heritage or resource consent perspective, even where it would otherwise be the more convenient choice.

Replacement starts to make more sense when problems have stacked up on a single window — persistent condensation, draughts that adjustment can’t fix, rot that’s spread through a significant portion of the frame, or a seal failure on double glazing that’s failed more than once. As a rough guide, if a repair is likely to cost more than half of what a straightforward like-for-like replacement would cost, replacement is usually the more sensible long-term decision.

Common Window Problems in Wellington Homes

Condensation and fogging

A hazy or foggy patch between the panes of a double-glazed window means the seal has failed and moisture has gotten in between the layers of glass. This can’t be cleaned or fixed from the outside — the glazing unit itself needs replacing, which is a job for a qualified glazier rather than a general repair.

Sticking or hard-to-open sashes

Timber swells and contracts with humidity and temperature, and Wellington’s damp winters make this particularly noticeable. A sash that sticks in winter and moves freely in summer is usually just normal timber movement rather than a fault, though persistent sticking can also indicate paint build-up in the frame channels or a sash cord that’s stretched or partially failed.

Draughts

Draughts around old timber sash windows are extremely common and usually come down to worn weatherstripping, gaps around the frame, or simply the natural gap tolerances of older joinery designs. Adding modern draught-proofing seals to an existing frame is often a cost-effective way to significantly improve comfort without a full window replacement.

Rot at the sill

The bottom rail and sill of a timber window sit exactly where water naturally collects, making this the most common spot for rot to start. Caught early, this is a straightforward localised repair. Left unaddressed, it can spread up into the frame and eventually compromise the whole window’s structural integrity, turning what could have been a $300 repair into a full replacement.

What’s Included in a Professional Window Repair

A proper window repair, rather than a quick patch job, typically includes:

• An assessment of the underlying cause, not just the visible symptom
• Removal and replacement of failed components — cord, glazing, putty, or damaged timber sections
• Priming any exposed bare timber before painting, to prevent moisture getting straight back in
• Reglazing with appropriate putty or glazing beads, matched to the window’s original style where relevant on heritage joinery
• A functional check — the window should open, close, and lock properly once finished, not just look repaired

Got a stuck sash, cracked pane, or draughty window? Get a free assessment or read more about our window repair services.