Restoration, repair and replacement of traditional sash and case windows — preserving period character while improving comfort, performance and energy efficiency.
Free No Obligation Quotes
True Heritage Windows
Crafted to Preserve Character
True Heritage Windows specialises in the restoration, repair and replacement of traditional sash and case windows. We combine traditional craftsmanship with modern upgrades to preserve the character of period properties while improving comfort, performance and energy efficiency. From draughty original sashes in tenement flats to listed-building conservation work, our craftsmen carefully retain the authentic detailing of your windows while bringing them up to modern standards of warmth, security and quiet.
Period Bay Window Sash & Case Restoration
Lomond Castle Double Glazing Installation
Sandstone Dormer Heritage Sash Window
Classic Tenement Sash Window Restoration
Traditional Tenement
Period Bay Window Sash & Case Restoration
Lomond Castle Double Glazing Installation
Sandstone Dormer Heritage Sash Window
Classic Tenement Sash Window Restoration
Traditional Tenement
Period Bay Window Sash & Case Restoration
Lomond Castle Double Glazing Installation
Sandstone Dormer Heritage Sash Window
Classic Tenement Sash Window Restoration
Traditional Tenement
“Preserve the Character. Upgrade the Comfort.”
Sash & Case Window
Refurbishments
Bring tired, draughty or sticking sash windows back to life. Our refurbishment service carefully overhauls your existing windows — replacing sash cords, weights, parting beads and staff beads, repairing rot and re-aligning frames — so they operate smoothly and look their best again while retaining all of their original character.
Full Sash & Case
Window Replacements
When repair is no longer enough, we manufacture and fit complete new sash and case windows made to measure for your property. Crafted in quality timber and matched to your existing sight lines, glazing bars and period profiles, our replacements are indistinguishable from the originals yet built to today's standards of warmth, security and weather performance.
Full Sash & Case Replacement
New Sash Replacements
& Repairs
When only the sashes themselves are damaged, there's no need to replace the whole window. We craft new sliding sashes to fit your existing frames exactly, and carry out targeted repairs to rotting rails, stiles and glazing bars — a cost-effective way to restore appearance and function while keeping the original frame and surrounding joinery intact.
Lomond Castle Double Glazing Installation
Double Glazing
Upgrades
Keep your original sash windows and bring them up to modern standards. We retrofit slim-profile double glazing into existing or new sashes, add draught-proofing seals, and improve thermal performance — reducing heat loss, noise and draughts while preserving the authentic look and feel of your period windows.
True Heritage Windows did a great job of replacing our front sash window. Liam was very professional and easy to deal with. He worked efficiently and came when promised. I would recommend this business.
Frequently Asked Questions
In most cases original sash and case windows can be repaired rather than replaced. We overhaul existing windows by replacing sash cords, weights and beads, repairing rot and re-aligning frames so they work smoothly again. We only recommend full replacement when the frames or sashes are beyond sensible repair, and we'll always advise you honestly on the best option.
Yes. We retrofit slim-profile double glazing into your existing or new sashes, along with draught-proofing seals, to improve thermal performance and reduce noise. This lets you keep the authentic look of your period windows while benefiting from modern warmth and energy efficiency.
Absolutely. A large part of our work involves heritage and conservation projects, including listed buildings. We have extensive experience replicating historic sash profiles, glazing bars and period details to satisfy conservation officers, and we can advise on appropriate materials and finishes for your property.
We're based in Glasgow and cover the surrounding region, including Paisley, East Kilbride, Hamilton, Cumbernauld and Bearsden. If you're just outside these areas, please get in touch — we're always happy to discuss projects further afield.
Lead times vary with the scope of work and our schedule. A single window refurbishment can often be completed in a day or two, while larger projects involving multiple windows or full replacements take longer. We'll give you a clear timeframe during the initial consultation and keep you updated throughout.
The simplest way is to call or text us for an initial conversation about your windows. We'll discuss your requirements, offer guidance, and arrange a site visit or survey where needed before providing a detailed quotation.
Get In Touch
Whether you're planning a single sash window repair or a full set of replacement windows for your period home, we'd love to hear from you. Call us for a conversation, or send a text and we'll get straight back to you.
Free No Obligation Quotes