Castle Windows supply quality sash windows, with a strong focus on tradition. They are a popular choice for period homes and for anyone who wants a classic look with modern performance.
Sash windows are defined by their vertical sliding mechanism, consisting of one or two moveable panels (sashes) that overlap. Historically made from timber, our modern versions utilise advanced uPVC to replicate traditional look while eliminating common structural failings. We supply a comprehensive range of profiles, including Flush, Tilt and Turn, and Foiled finishes, engineered to balance period character with high-performance thermal values. By integrating precision-engineered hardware with durable materials, these windows provide consistent operation and improved acoustic insulation for any property type.
A service we’re proud to put our name to
Don’t just take our word for it — homeowners across the West Midlands rate Castle Windows excellent.
Fully qualified & trained staff
Insurance-backed 10-year guarantee
Straightforward & friendly approach
Over 30 years’ direct experience
The primary technical advantage of modern sash windows is the integration of multi-chambered profiles and high-specification glazing. Our double and triple-glazed units utilise argon-filled gaps and low-emissivity glass to create an effective thermal barrier. This configuration significantly reduces heat transfer, allowing for a potential reduction in heating energy consumption of up to 70% compared to legacy single-glazed timber units. This transition to high-performance glazing also contributes to a measurable reduction in a building’s annual carbon footprint.
All products supplied by Castle Windows are fully compliant with CE Marking requirements as mandated by the Construction Products Regulation. This certification ensures that our windows meet essential European health, safety, and environmental protection standards. As the installer, we hold full responsibility for verifying that every external unit meets these technical declarations. Documentation regarding our Declaration of Performance is available for technical review upon request.
The Castle Windows Specification We provide technical expertise across various window configurations, including Casement, Bay, and Bow designs. Our sash window specifications prioritize three core pillars:
Multi-chambered uPVC frames designed for low U-values.
High-grade uPVC that resists UV degradation and environmental wear.
Every unit is made to measure, allowing for exact structural fits and custom opening configurations.
Modern uPVC sash windows solve the historical maintenance issues associated with vertical sliders:
Our uPVC profiles are engineered to prevent warping, rotting, or fading. The material remains chemically stable in fluctuating temperatures, ensuring the sliding mechanism does not stick or bind over time.
Each unit is fitted with multi-point locking systems and reinforced sash stops. The structural rigidity of the frame, combined with internal glazing beads, provides a robust defense against forced entry.
The brush seals and weather stripping in our sash designs create a weather-tight seal, preventing drafts and maintaining a consistent internal microclimate.
Unlike timber, these frames require no repainting or chemical treatment. Periodic cleaning of the tracks and frames is sufficient to maintain mechanical performance.
Sash windows can be tailored to match specific architectural requirements through several technical and aesthetic variables:
We provide a comprehensive supply and fit service for uPVC windows and doors, focusing on structural accuracy and energy retention. Our installation process ensures:
The requirement for planning permission is dictated by the property’s legal status and location.
Yes, sash windows can add value to a property. Sash windows are often considered a desirable feature, especially in period properties or homes within conservation areas. They add a classic and elegant aesthetic that can enhance the overall curb appeal and character of a home.
Additionally, modern uPVC sash windows combine the traditional look with contemporary benefits such as improved energy efficiency, low maintenance, and better security, making them a valuable upgrade. Potential buyers may be willing to pay more for a property that has these attractive and functional windows installed.
Whether you need planning permission to install sash windows depends on several factors. If your property is a listed building, you will need listed building consent to make any changes, including installing new sash windows. This is to ensure that the historical character of the building is preserved.
In conservation areas, you may need planning permission to install sash windows, especially if they are significantly different in appearance from the existing windows. This is to maintain the area’s historic or architectural interest.
For most other properties, installing or replacing sash windows usually falls under permitted development rights, meaning you do not need planning permission. However, the new windows should be similar in appearance to the existing ones, particularly if you are replacing older windows. It’s always a good idea to check with your local planning authority to confirm whether you need planning permission for your specific situation. They can provide guidance based on the details of your property and the type of changes you wish to make.
Our latest project takes us to Lower Penn in Wolverhampton, where we’ve just completed a striking installation that beautifully balances period charm with contemporary performance.
Key Features of the Project
