Our window restoration service is designed to preserve the character, appearance and quality of traditional box sash windows while improving their performance, condition, thermal efficiency and ease of use.
Sash window restoration involves a careful combination of renovation, refurbishment, draught proofing, thermal window upgrades and a complete overhaul of the window system. This includes repairing mechanical faults, addressing rot and decay, replacing worn sash cords, checking pulleys and ensuring the weights are correctly balanced so the windows operate smoothly.
During the restoration process, the sash windows and box frames are carefully assessed. Paint is either sanded back or removed, and any decaying timber in the units, frame or cill is exposed to identify the sound timber beneath. Where timber can be saved, we use specialist restorative joinery techniques and high-quality resin repairs to fill cavities and mould the repair to the original shape of the wood. In cases where the existing timber is beyond repair, new or reclaimed timber may be joined in or replaced sympathetically.
Alongside the restoration work, we can also advise on suitable thermal window upgrades to help improve comfort and energy efficiency. These upgrades are designed to reduce heat loss, improve insulation and make traditional sash windows more practical for modern living, while still respecting the original appearance of the property.
Most of our wooden sash window restoration work is carried out on site, allowing us to complete the process with minimal disruption. Where required, the windows can be removed and restored at our workshop. Restoration can be labour-intensive, particularly when windows are in a poor state of repair, but it is often the preferred option for listed buildings and conservation area properties where retaining original features is important.
In some cases, especially where the sashes are too badly damaged, newly made sashes may be a more cost-effective option while retaining the original box frame. Our team will always advise honestly on the most suitable approach for your property, including whether restoration, replacement sashes or thermal upgrades would provide the best long-term result.
Once the repairs are complete, the windows and boxes are redecorated to the highest standard using quality materials. The result is a beautifully restored window that retains the charm and appearance of the original feature while improving function, comfort, thermal performance and longevity.
Regular sash window maintenance is also important. Common issues include cracked or flaking paintwork, sticking windows, failed putty, broken panes, damaged cords and timber decay, particularly to the bottom rail. With timely inspection and professional care, many of these issues can be repaired before they become more serious.
At Nexus of Bath Limited, we take pride in restoring sash windows with skill, patience and respect for the property’s original character, while helping improve performance through careful draught proofing and thermal window upgrade options.
