New Timber Sash & Case Windows

What Makes a Preservation Window

Classic and timeless, traditional sash windows have stood the test of time over centuries.  Sash windows hold a distinguished and elegant window design to complement the most striking architecture.  Preservation Windows use innovative methods that eliminate draughts, reduce noise and repair rotten windows to maintain the period charm of wooden sash windows that will add value to your property.  All of our windows are made bespoke according to your specifications. Every order is completely individual and at Preservation Windows we place equal emphasis on quality and service.

Bespoke Service

  • We offer a full replacement service that combines traditional aesthetics with modern performance. Every window is custom-made to your exact requirements by expert craftsmen at our workshop just outside Glasgow. By managing the entire process - from manufacturing and glazing to factory painting - we ensure a spectacular hardwood finish and a seamless installation by our experienced team.

We offer a full replacement service that combines traditional aesthetics with modern performance.

High-Performance Glazing

As part of our complete replacement service, we offer advanced insulation solutions that make your home feel noticeably warmer while enhancing energy efficiency.

  • You can choose to have your new windows fitted with either double glazing or vacuum glazing, depending on your needs and priorities. Our high-performance double glazing provides excellent thermal insulation and sound reduction, making it a reliable and cost-effective option for most homes. For those looking for the very best in insulation technology, vacuum glazing offers superior thermal performance in a slimmer profile.

The Perfect Finish

The final details define the look. Personalise your new windows with a curated range of premium ironmongery in a variety of high-quality finishes.

  • For the paintwork, we offer a truly bespoke service: while you have the freedom to choose your internal colours, we provide expert guidance on external finishes based on your building's status. Whether you are working within the requirements of a listed building or looking for a custom palette for a modern renovation, we ensure a flawless finish that suits both your style and your home's heritage.

Expert Planning Support

We provide full support throughout the planning process, offering expert guidance or complete management of applications for listed building consent and conservation area approvals.

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FAQs

  • We offer a full refurbishment service in which the sashes are carefully removed and taken to our workshop for a complete overhaul. This includes repairing or replacing rotten timber and putty, reglazing where applicable, installing a new draught-proofing system with QLon seals, and fully repainting the sashes.

  • Yes. We use traditional methods and ethically sourced materials on all window replacement and refurbishment projects. All waste materials are disposed of or recycled responsibly, and wherever possible we refurbish existing components—such as ironmongery—to minimise waste.

  • Yes. Hardwood timbers are a highly sustainable and durable material when responsibly sourced, making them ideal for long-lasting window repairs and replacements.

  • Absolutely. We can assist with planning applications and conservation queries where required. All replacement windows are made like for like, matching original details such as pane formation, proportions, and horn designs. This ensures the building retains its traditional appearance and value—an essential consideration for listed buildings and conservation areas.

  • No, the majority of our work is carried out internally. In the rare cases where internal access isn’t possible, our trained operatives can safely work from scaffold towers or MEWPs.

  • Yes. Replacing your windows with hardwood double-glazed sash and case windows can significantly reduce condensation problems. For further guidance, we recommend the information available on the Glass and Glazing Federation website.

  • We work exclusively with hardwood timbers, which can be specified by the client or contractor. Most commonly, we use Meranti, a durable hardwood that offers excellent longevity at a more affordable price point.

  • We rout discreet channels into the sashes—along the sides, at the meeting rails, and at the head and bottom—to install a draught-proofing system. We use QLon seals, which act like memory foam, allowing the sashes to fit tightly against the case while still operating smoothly and eliminating draughts.

  • We usually replace around three windows per day, including full removal and installation.

    The service is then completed with on-site mastic application and final painting following this for a high-quality finish.


Let’s talk about your windows

Speak to our team today to arrange a survey or explore the best solutions for your timber sash and case windows.

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