Harber Carpentry and Restoration 

Window Repairs 

Traditional Window Repairs in East Anglia

Harber Carpentry and Restoration undertakes traditional timber window repairs and restoration for listed and historic buildings across East Anglia.

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Historic timber windows are an important part of a building’s character and architectural integrity. Our approach focuses on repairing and conserving original joinery wherever possible using traditional carpentry methods and sympathetic materials suited to period properties.

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We repair traditional sash windows, casement windows and historic timber frames while preserving original detailing and improving long-term durability.

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Traditional Leaded Light Repairs

Protecting the character of traditional leaded lights.

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We undertake careful repairs to original leaded lights, preserving historic glass and traditional craftsmanship wherever possible. Whether individual panes require attention or larger areas need sympathetic restoration, we aim to retain the character and authenticity of the original glazing while ensuring it remains structurally sound and draft-free for years to come.

Our services include:

• Glass Preservation: Retaining original, historic glass and sourcing accurate restoration matches for broken panes.

• Lead Came Rebuilding: Repairing fractured joints or completely re-leading weak, bowing panels using traditional soldering techniques.

• Weatherproofing & Cementing: Applying specialist linseed-oil-based cement to seal gaps, eliminate drafts, and add structural rigidity.

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Specialist Repairs for Historic Timber Windows

Many older timber windows can be repaired successfully without requiring complete replacement. Careful assessment helps identify decayed or damaged areas while retaining as much original material as possible.

Our window repair work includes:

• Timber window repairs

• Sash window restoration

• Casement window repairs

• Decayed timber replacement

• Window frame conservation

• Traditional joinery repairs

• Draught reduction improvements

• Glazing bar repairs

• Cill replacement

• Window frame splicing

• Coloured resin repairs

We undertake repairs for listed buildings, period homes, cottages and heritage properties throughout East Anglia.

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Original Steel Window Repairs

Preserving original steel windows, not replacing them.

We specialise in the repair, overhaul, and restoration of original steel windows, helping to retain the character, craftsmanship, and historic integrity of period properties. From unsticking seized frames and straightening glazing bars to removing corrosion and rust, we take a sympathetic approach wherever possible—restoring existing windows rather than replacing them unnecessarily.

We can undertake:

• Rust Removal & Treatment: Shot-blasting frames to bare metal and applying linseed based primers.

• Metalwork Repairs: Sectional welding to replace deeply corroded steel and straightening distorted glazing bars.

• Component Overhaul: Repairing, servicing, or sourcing authentic replacements for historic ironmongery and hinges.

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Common Problems Affecting Historic Windows

Historic timber windows are often affected by long-term moisture exposure and inappropriate modern repairs.

Common issues include:

• Rotten timber frames

• Failed window cills

• Sticking sash windows

• Water ingress

• Cracked glazing putty

• Paint failure

• Structural movement

• Fractured joints

• Condensation problems

• Insect or fungal decay

• Bowing and bulging

•  Loose or missing cement

Proper diagnosis is essential to ensure repairs address the underlying cause rather than simply masking visible deterioration.

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Why Repair Original Timber Windows?

Historic timber windows were traditionally built using durable materials and repairable joinery methods designed for long service life.

Repairing original windows can:

• Preserve historic character

• Retain original craftsmanship

• Improve longevity

• Reduce unnecessary replacement

• Maintain listed building integrity

• Improve energy performance sympathetically

Traditional repairs are often more appropriate and sustainable than modern replacement systems in historic buildings.

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Traditional Materials and Breathable Repairs

Historic buildings require breathable materials that allow moisture to evaporate naturally. Modern impermeable sealants and unsuitable repair products can trap moisture within timber frames, contributing to long-term decay.

We use traditional and compatible materials where appropriate, including:

• Linseed based products

• Traditional glazing putty

• Lime based products

• Appropriate timber species

• Traditional joinery techniques

Understanding moisture behaviour is essential for the successful repair of historic windows.

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Frequently Asked Questions

Can rotten timber windows be repaired?

Yes. Many historic timber windows can be repaired using traditional splicing and localised timber repairs while preserving much of the original joinery.

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Why should I repair my original windows instead of replacing them?

Original steel and leaded windows are an integral part of your property’s history, character, and financial value. Historic windows were crafted using high-quality materials built to last centuries. Repairing them preserves the authentic look of your home, keeps original craftsmanship alive, and is a far more sustainable, environmentally friendly choice than manufacturing new replacements.

Should original sash windows be replaced?

In many cases, original sash windows can be restored and repaired successfully without full replacement, helping preserve the character of the building.

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Do listed building window repairs require consent?

Some repairs and alterations to windows in listed buildings may require listed building consent depending on the extent of work involved.

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My property is Listed / in a Conservation Area. Do I need permission for repairs?

Generally, straightforward repairs and like-for-like maintenance do not require Listed Building Consent, as long as the original materials, design, and details are preserved. However, if you plan to alter the windows (such as introducing slimline double glazing), you will likely need consent. We always recommend checking with your local planning authority or conservation officer before work begins.

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Why do timber window cills rot?

Window cills are particularly vulnerable to prolonged moisture exposure caused by failed paint systems, poor drainage or trapped damp.

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Will you save my original historic glass?

Absolutely! Preserving original glass is our top priority. Historic glass has beautiful imperfections, ripples, and tints that modern glass cannot replicate. During a rebuild, we salvage every viable piece of original glass. If a pane is completely shattered, we carefully source authentic restoration or salvage glass to match the colour, thickness, and texture of the original.

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What materials are best for historic window repairs?

Traditional timber, breathable paint systems and compatible glazing materials are generally most appropriate for historic window repairs.

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Do you have to take the entire leaded window away to fix a few cracked panes?

Not always. If the surrounding lead cames is in excellent, sturdy condition and only a few individual glass panes are cracked, we can often carry out on-site, localised repairs. However, if the window is bowing, bulging, or rattling severely, the entire panel will need to be carefully extracted and restored in our specialist workshop.