Sash Window Restoration
Sash windows are one of the most defining features of London's period housing stock, and one of the most commonly mishandled, either left to fail through neglect, or replaced wholesale with modern uPVC that strips a Georgian or Victorian facade of its character. We restore, don't default to replace: cords, mechanisms, timber, glazing and draught-proofing, working to keep the original frame wherever it can genuinely be saved.
What Is Sash Window Restoration?
Sash window restoration is the process of returning a window to full, smooth working order while preserving as much of the original timber and glazing as possible. It covers everything from a simple cord replacement and mechanism service through to full frame repair, resin splicing of decayed sections, re-glazing, and draught-proofing to bring an original window up to a comfortable, modern standard of performance without losing its period appearance.
Why It Matters
A sash window is very rarely beyond repair, even when it looks it, cords fail, timber rots at the sill, paint seizes the mechanism, but the core frame is usually sound. Full replacement is not only more expensive than most owners expect, it also permanently changes the character of a period facade, and on listed buildings or in conservation areas is often restricted or requires specific consent. Restoration is almost always the better choice: cheaper, faster, more in keeping with the building, and, done properly, a window that will outlast a modern replacement by decades.
Lime Heritage Restorations proudly serves clients across London and the Home Counties, including Chelsea, Kensington & Notting Hill, Richmond upon Thames, Wimbledon, Hampstead & Highgate, and Greenwich.
In addition to our work across the capital, we regularly work further afield, delivering heritage restoration and full house refurbishment in Surrey, Kent, and Hertfordshire.
Whether you're restoring a listed building or undertaking a complete heritage refurbishment, we bring expert craftsmanship, breathable materials, and conservation-sensitive finishes to every project we take on.
What to Know Before You Start.
Timber matched to the original sash, typically softwood or hardwood depending on the property's age and region, along with traditional cord, pulley and weight mechanisms, and slimline double-glazed units where upgrading glazing without altering the window's external appearance.
On listed buildings and in many conservation areas, replacing original sash windows, even with an accurate reproduction, typically requires listed building consent or planning permission, while like-for-like repair usually doesn't. This is one of the clearest cases where restoration avoids a consent process that replacement would trigger.
A single window with typical wear is usually a one to two day job once removed to the workshop; a full house of sashes is more efficiently handled as a phased project, working through the property window by window so you're never without windows in every room at once. We'll give a realistic per-window and whole-project timeline after survey.
We default to restoration, not replacement, because it's very often the better outcome, cheaper, faster, and in keeping with the building, but we'll say clearly if a specific window genuinely is beyond saving rather than pushing restoration as a blanket policy regardless of condition. We're fully insured for both workshop and site-based window restoration, and provide a written guarantee on completed repairs. Where new components, cords, pulleys, weatherstripping, are fitted, these carry manufacturer warranties in addition to our own workmanship guarantee.
Frequently asked questions
In most cases yes, particularly per window, restoration avoids the cost of full new frames and glazing units, and because it doesn't require listed building consent or planning permission in most cases, it avoids that time and cost too.
Yes, traditional draught-proofing systems fitted into the existing frame make a significant difference to both without needing to touch the glazing at all, and are usually the first thing we'd recommend before considering re-glazing.
A single window with moderate wear is typically a one to two day job; more extensive timber repair or a full set across a property takes longer. We give a realistic per-window timeline after survey.
With good draught-proofing and, where appropriate, slimline double glazing, restored sashes perform very close to modern replacement windows for heat and noise, without sacrificing the property's original character or triggering a consent process replacement windows often would.
Yes, we can arrange periodic servicing, checking cords, mechanisms and draught seals, which extends the life of a restoration considerably beyond a one-off repair with no follow-up.
