Full Window Renovation

Sash & Casement Window Renovation

Full Timber Window Renovation Service

Full timber sash and casement window restoration is a specialist conservation process that focuses on retaining and repairing original joinery rather than replacing it. In many period properties—particularly Georgian, Victorian, and Edwardian homes—the original timber windows are a defining architectural feature. Restoration typically involves carefully dismantling the window units, repairing or splicing decayed timber, reinstating glazing where needed, and refurbishing the existing sash cords, pulleys, and ironmongery. Draught proofing systems can also be discreetly integrated to significantly improve thermal performance while preserving the historic appearance of the windows.

In the case of listed buildings, restoration is especially important because original windows are often protected as part of the building’s historic fabric. Organisations such as Historic England emphasise repair over replacement wherever possible, since original timber windows contribute to the architectural authenticity and heritage value of a property. Full restoration allows homeowners to remain compliant with conservation requirements while avoiding the loss of character that can occur with modern uPVC replacements or inappropriate alterations

The benefits of Restoring over costly replacement

The benefits of full sash and casement restoration are both practical and aesthetic. Properly restored timber windows can dramatically improve energy efficiency through discreet draught proofing, reduce noise infiltration, and extend the lifespan of the original joinery by decades. At the same time, they preserve the proportions, sightlines, and craftsmanship that make period properties distinctive. For many owners of heritage and listed homes, restoration also helps maintain property value by respecting the building’s original design intent while upgrading comfort and usability for modern living.

Whats Included on a full window restoration project

Remove Rot
Wood Splicing
Specialist Resin Repairs
Re-decoration

Structure Restoration

Window Adjustments
Cord & Lock replacement
Weight Calibration
Smooth Operation

Functionality Restoration

Sash / Casement Adjustments
Draught proof system
Integrated Brush Pile
Thermal Upgrade Option

Ventilation Control

Dust Prevention.

Whilst working in your home we take every care to ensure that we create as little mess as possible, working on the windows can be a dusty process even when using dust extraction enabled tools.

We try to minimise that where possible by erecting our dust wall system when working on the window frames, this consists of fabric sheeting held by special spring loaded poles from floor to ceiling and spans wall to wall around the area to be worked on creating a barrier.

This will enable us to keep the dust levels in the room to the absolute minimum, less mess equals less stress and quicker cleanup time.

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Client Reviews

Dec 05. 2025

Great Company, Highly Recommended

“I been using CTWS to refurb all our wooden windows in phases over the last year or so. They have been great. Attention to detail, restore old windows very sympathetically and have retrofitted slim line double glazing and draft proofing where possible and so now we have beautiful old windows to more modern standards. Would definitely recommend..”

Feb 01, 2026

Highly Recommended

“We spent some time searching for a company to restore the original windows in our Georgian house and are so pleased we found CTWS. The team worked so carefully and with such skill to preserve and refurbish our wooden sash windows, including adding invisible double glazing that has made a big difference to the warmth of the house. The windows look wonderful now. Great customer service too. We cannot recommend highly enough.”

Mar 30, 2026

Fantastic from Start to Finish

“I spent quite some time looking for a company to repair wooden sash windows in our listed Georgian house and from the initial enquiry to the completion of work, CTWS didn't disappoint. Stuart and the team were able to fit me in to do an urgent repair and couldn't have been more helpful. Skilful, hardworking, tidy and a pleasure to have around, so ticked all the boxes for me!

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Your Restoration Questions Answered

In most cases we can fit slim double glazing units to your existing sash or casement windows, however this is subject to a survey, for suitability Please contact us to arrange a site visit.
If you have chosen a package that includes painting then yes we would repaint the windows after the repairs have been completed
Moisture ingress, failed paint systems, blocked drainage paths, UV exposure, poor ventilation, insect attack, and lack of maintenance.
This is a very common problem, as part of our draught proofing installation or refurbishment packages we will free up your windows and return them to full working order.
This will all depend on a number of factors that we have to consider such as location, window size and accessibility, the amount of repairs required, if there are any broken glass panes, if you require draught proofing installation, or double glazing upgrades, painting etc.
It is best to speak to one of our advisers and book a survey.
Yes. Usually this can be resolved. Our draught proofing service will eliminate that problem.
We regularly work on Grade 2 listed buildings & properties in conservation areas. Like for like repairs do not require planning permission as they do not change the appearance of the building.
No, our slim double glazing units are designed to look like single glazing but have the modern day attributes.
No, we do all of our work onsite, however, if we need to have a new sash or casement window manufactured because its beyond economical repair we will remove it and cover the window opening with board to make the property secure during the manufacturing process.

Aftercare & Maintenance

Our timber window maintenance check programme is designed to identify potential issues before they become costly problems.

Gain peace of mind knowing as a pervious & valued customer your timber windows are being monitored and cared for correctly, helping to maximise their lifespan and protect your investment.