Trade uPVC casement windows

Who orders trade uPVC casement windows?

Mostly window and door installers, builders and main contractors, landlords and property managers, housing associations and their contractors and housing developers. Typical uses include replacement windows in houses and flats; new-build and extension packages; landlord and social housing refurbishment.

Casements cover most replacement work in the UK because almost any opening can be laid out with a mix of side-hung, top-hung and fixed lights. You give us the sizes and opener layout and each window is made to that schedule rather than chosen from a list of standard sizes.

Every window on your order is listed separately on the quote with its size, layout, glass and finish, so you can check the whole job line by line before anything is put into production.

If the property needs background ventilation, tell us which windows take trickle vents and we fit them in the frame head before dispatch, which saves routing them on site.

For first-floor bedrooms and other rooms that need an escape route, specify egress hinges on the relevant sash and give us the clear opening you need; we show on the quote the clear opening each sash gives, and your installer confirms it meets the escape requirement.

Foiled colours and woodgrains are applied to the profile before fabrication, so colour windows are made on the same programme as white ones and arrive with matching cills and trims if you order them together.

How should you measure?

Measure the brick opening at three points across and three points high, take the smallest of each, then deduct your fitting gap (usually 10mm overall each way) to give the frame size you order.

Which building regulations apply?

Replacement windows in England should meet Approved Document L: a U-value of 1.4 W/m²K or a Window Energy Rating of band B. Approved Document F expects background ventilation to be no worse than before, which usually means trickle vents. Glazing in critical locations must break safely, be robust or in small panes, or be permanently protected under Approved Document K, which in practice usually means toughened or laminated safety glass. Rooms that need an escape route may need an escape window under Approved Document B. Replacing windows is notifiable building work: the installer self-certifies through a competent person scheme such as FENSA or Certass, or the work goes through building control.

More detail: Approved Document L guide safety glazing guide. Your installer or designer remains responsible for compliance and any notification.