uPVC Sliding Sash Windows

uPVC sliding sash windows are a modern take on the traditional vertical sliding sash, giving period and new build homes classic proportions with the low maintenance of uPVC. At Cristal Windows we supply REHAU Heritage sliding sash windows, which combine traditional charm with modern innovation.

For most homeowners, uPVC sash windows are the better practical choice. They closely replicate the appearance of painted timber, require far less maintenance, and deliver better thermal performance than original single-glazed timber sashes. The only context where timber retains a clear advantage is on listed buildings where the planning authority specifically requires it.

We work with REHAU, installing their Heritage sliding sash windows. These profiles are built from high quality materials for improved thermal performance, durability, security, weatherproofing and design.

Yes. You can choose from a range of sash window styles and tailor the look with your choice of finishes, colours, woodgrain foils and period-style hardware, so the windows suit both modern and traditional properties.

Yes. With multi-chambered profiles and modern double glazing, our sash windows minimise heat loss to help keep your home warmer all year round and reduce energy bills.

Our uPVC sash windows use advanced spring balance mechanisms for smooth, reliable operation, without the sticking, snagging or lagging associated with older sash windows.

A sash window can be opened at the top and bottom at the same time, which creates a convection effect: warmer air escapes through the gap at the top while cooler air enters at the bottom. This works particularly well in bedrooms where you want airflow without a wide-open window.

There are usually three approaches. The existing box frame can sometimes be modified to accept new uPVC sash units, it can be adapted to take a different window style, or the original box frame can be fully removed and the reveal rebuilt. Whichever route is taken, some internal making good is almost always required, so it is worth asking each installer exactly how they intend to handle the box frame and what is included for internal reinstatement.

In many conservation areas, replacing windows with a matching style and profile falls under permitted development, though it always depends on the local authority. For sympathetic replacements, Cristal Windows also offers uPVC sash windows with timber-effect weld joints rather than the standard mitred profile, which more closely replicates a painted timber sash and is accepted in some conservation areas where standard uPVC would not be.

Most standard window replacements fall under permitted development and do not require planning permission. Conservation areas and listed buildings are the main exceptions. A free survey with Cristal Windows will flag any local restrictions before any work is planned.

Noise reduction is determined by the glazing specification, primarily the gap between the panes and whether acoustic glass is used, rather than by whether the window slides or swings. Sash windows can be specified with enhanced acoustic glazing if noise is a particular concern.

Cristal Windows is a trusted installer of Yale hardware, and our windows are manufactured and installed with security in mind. Buying your windows with us means you benefit from a Yale Lifetime Security Guarantee.

Our sliding sash windows come with a fully insured 10-year guarantee covering performance, durability and quality.

We install for homeowners across Berkshire, Hampshire and Surrey, including Fleet, Farnham, Basingstoke, Camberley, Aldershot, Hook, Farnborough, Bagshot, Guildford, Windsor and Ascot. We normally work within around 30 miles of Fleet, so if you are just outside the area, get in touch and we will check whether we can reach you.

You can use our online quoting engine for a free, personalised quote, call us on 01252 810 777, or fill out our contact form and a member of the team will get back to you.