Leadlight Window Restoration in Dunedin – Original Panels Releaded, Bowing Corrected

This is a bigger service in Dunedin than almost anywhere. Front door fanlights, hall windows and bay window top lights turn up constantly through Roslyn, Maori Hill, Mornington, Caversham and the older streets of North East Valley, and the churches, schools and commercial buildings from the gold rush era carry a great deal more. Lead came has a working life of roughly eighty to a hundred years, which means an enormous number of Dunedin panels are due now.

Why panels bow, and what it means

Lead is soft. Over decades gravity and wind pressure push a panel outwards in the middle. Once the bow passes about 15mm the cement between the lead and the glass cracks out, the panel starts to rattle, and pieces begin to crack at the corners where the movement concentrates.

A bowed panel is not lost. It comes out, gets flattened, and either has failed came replaced or is re leaded onto the original pattern. The glass is reused. Leave it too long and the pieces start breaking, which adds real cost.

Matching old glass

The coloured and textured glass in a Victorian or Edwardian leadlight is not manufactured any more. Matching it means finding period glass or accepting the closest modern equivalent, and being straight about which one you are getting.

In a busy pattern a small repair disappears. In a plain field of one colour it will show, so sometimes the better answer is to move an original piece into the visible position and put the new glass somewhere nobody looks.

Double glazing a leadlight

A restored panel can be sealed inside a double glazed unit, with the leadlight sitting in the cavity between two panes of clear glass. It keeps the appearance exactly, protects the panel permanently from weather and handling, and brings the opening up to modern thermal performance.

This is the usual approach when a character home is being retrofitted throughout, because otherwise the front door fanlight ends up as the one cold spot left in the house.

Churches, schools and commercial panels

Dunedin's gold rush building boom left the city with a large stock of ecclesiastical and institutional glass, most of it now well past the working life of its lead. Those panels are larger, heavier and usually higher off the ground than a domestic fanlight.

We quote access, removal, bench restoration and refitting as separate lines so a committee or a board can see exactly what it is approving, and we can stage the work panel by panel across a budget cycle.

Handling a leadlight panel

Getting it out without losing pieces

A bowed panel is already under stress and the cement holding the glass has usually cracked out. Lifting it badly is how a repairable panel turns into a rebuild.

We support the panel across its full face, cut the putty or bead back rather than levering, and take it out flat. Once it is on the bench it gets photographed and rubbed so the pattern can be reproduced exactly if a piece is beyond saving.

Re leading against spot repair

Where a few solder joints have failed and the came is otherwise sound, a spot repair is cheaper and keeps more of the original lead.

Once the came has work hardened across the whole panel, spot repairs simply move the stress to the next joint. At that point a full re lead onto the original pattern is the honest answer, and it buys another eighty years.

How Window and Glass Repair Dunedin approaches leadlight window restoration in Dunedin

Dunedin has more original timber joinery still in service than any other New Zealand city. Most of it is repairable and the method is what decides whether the repair lasts.

1. Establish what is actually sound

   Window and Glass Repair Dunedin probes the timber to find where decay stops, which is almost always further than it looks from the paint line. That defines the extent of the work before a price is given rather than after.

2. Take the sash out where possible

   Bench work gives better access, a cleaner joint and the chance to deal with everything at once. The opening is secured while the sash is away rather than left open to a Dunedin winter.

3. Cut back and scarf in matched heartwood

   Decayed timber is cut back to sound material and new heartwood spliced in with a long scarf joint, glued and fixed. Window and Glass Repair Dunedin does not fill rotten timber, because filler bridges the problem instead of removing it and it reappears at the edge of the repair within a few years.

4. Free the moving parts

   A century of paint in the staff bead, the parting bead and the rebates is the most common reason a sash will not move. Stripping those surfaces back returns windows that have been painted shut for decades.

5. Replace cords, weights and pulleys as a set

   On a double hung sash the counterbalance is a system. Window and Glass Repair Dunedin replaces the cord with waxed cotton of the correct diameter for the pulley and rebalances the weights to the actual mass of the repaired sash, which changes if it has been reglazed.

6. Draught proof while it is apart

   Brush seals in the stiles and at the meeting rail go in during the same visit. Done separately it costs a second dismantling, and on a frosty Dunedin morning the meeting rail is the biggest single draught path in the house.

7. Reglaze, prime and reinstate

   New putty or beads, and bare repaired timber primed the same day even where the finish coat is somebody else's scope. One wet week on unprimed end grain undoes the work.

Why leadlight window restoration matters more in Dunedin

This is the city where original joinery is most worth saving and most at risk.

The largest Victorian and Edwardian stock in the country

What is in these houses cannot be bought again. Original sashes carry glass with visible ripple and joinery profiles that no modern manufacturer runs, so replacing them is a permanent loss rather than an upgrade.

Rot concentrates at the bottom rail and sill

The lowest horizontal surface takes every drop of water that gets past the glazing, and with fifty odd frost days a year it stays wet far longer than it would further north. That is why almost every timber repair here starts at the same place.

Restored timber outperforms its reputation

A properly repaired and draught proofed sash with a slim sealed unit performs far better than people expect, and it keeps the external appearance the house was designed around. The choice is rarely as stark as replace or freeze.

Heritage rules can apply

Work on a scheduled heritage building can need resource consent even where building consent is not required. Window and Glass Repair Dunedin checks the district plan schedule before quoting on anything that looks significant, rather than after.

What leadlight window restoration costs in Dunedin and how long it takes

Timber work is priced by the hour and by the extent of decay, so the honest answer involves bands rather than a single figure.

Sash repair and rebalancing

Cords, weights, pulleys, freeing painted shut sashes and rebalancing is the most common job and it sits at the lower end. It is a day or two per window depending on how much paint has to come off and whether the sash comes to the bench.

Rot repair by scarfing

Cutting back to sound heartwood and splicing in new timber is priced by the length of the repair and the number of sections. Filling would be cheaper on the day and fails within a few years, so Window and Glass Repair Dunedin does not offer it as the cheap option.

Slim sealed units in original sashes

Where the rebate can take it, retrofitting a double glazed unit into the original sash runs roughly $800 to $1,250 per window including the rebalancing the added weight requires. It keeps the external appearance completely.

Against replacement

New timber joinery on a heritage house runs $800 to $1,250 per window and more where profiles have to be matched. Restoration is usually less, and it keeps original glass and joinery that cannot be bought again.

Restoration or replacement on a Dunedin villa

The decision is more open than people assume, and these are the four things that settle it.

How much sound timber is left

If the stiles and rails are sound and the decay is confined to the bottom rail and sill, restoration is straightforward and it is the better answer. Where decay has reached the joints the calculation shifts.

Whether the house is scheduled

Work on a scheduled heritage building can require resource consent even where building consent does not apply. Where that is the case, restoration is usually the only practical route and reversible additions are preferred.

What the original glass is worth

Early float and hand drawn glass has visible ripple that modern glass does not. Once it is gone it is gone, and on a Victorian or Edwardian house it is a large part of what the windows contribute.

What performance you actually need

A restored, draught proofed sash with a slim sealed unit performs far better than its reputation. It will not match thermally broken joinery, and on a character house the gap is usually a fair trade for keeping the building intact.

Restoring an original leadlight panel in Dunedin

Full restoration is dismantling a panel and rebuilding it, and it is the right answer when the lead itself has reached the end.

Rubbing and recording before dismantling

The panel is rubbed or photographed in detail so the design can be rebuilt exactly. Once it is apart there is no reference, and no two hand made panels are identical.

New lead came, original glass

The glass is cleaned and kept. The lead is replaced with new came of matching profile, which is what restores rigidity and weathertightness. Only broken pieces are substituted.

Cementing and finishing

The rebuilt panel is cemented on both faces, cleaned and patinated so the new lead reads as aged rather than silver. That final step is what stops a restored panel looking obviously new.

Heritage considerations in Dunedin

On a listed or scheduled building the rules change and it is worth knowing before work starts.

Scheduled buildings and resource consent

Work on a scheduled heritage building can need resource consent even where building consent is not required. We check the district plan schedule before quoting on anything that looks significant.

Reversibility is the principle

Good heritage practice keeps original fabric and makes additions reversible. Secondary glazing is preferred to modifying an original sash for exactly that reason.

Documenting what was done

Photographs before, during and after, and a written record of what was replaced. On a heritage property that record has value to the owner and to whoever owns it next.

Leadlight Window Restoration at a glance

Common faults

Bowing, cracked cement, broken pieces, failed solder joints

Repair

Panel removed, flattened, came replaced, re cemented and refitted

Glass

Period glass sourced where possible, closest modern match otherwise

Double glazing

Restored panel sealed inside an insulated glass unit

Lead life

Around 80 to 100 years before came needs replacing

Temporary

Opening glazed or boarded while the panel is off site

Larger work

Access, removal, restoration and refit quoted as separate lines