uPVC Bay and Bow Windows

A bay or bow window is really several windows joined at angles and carried on a projection from the wall. Replacing one is not the same as swapping a flat frame: the joints between the sections, the roof or canopy above, and the load the frames help carry all need thought.

We replace the frames within the existing projection, keeping the shape of the room and the look of the house from the street.

In many older bays the original timber frames play a part in supporting the structure above. During the free survey we look at the head of the bay, the condition of the sill and base, and whether support will be needed once the old frames come out. Where it is, the new uPVC frames are fitted with suitable reinforcement at the joints.

We also check how the sections meet, because the angle of each joint must be reproduced accurately for the new frames to sit tight and weatherproof.

Each section is designed like its own casement: you choose which lights open and which stay fixed, and whether to add top openers for ventilation. Sealed units can include Planibel A low-emissivity glass, which matters in a bay because of the amount of glass facing outwards. Frames come in white or with woodgrain and colour foils, inside and out.

Bay and bow windows are fitted by our FENSA and CERTASS registered installers, and the work is covered by the compliance certificate you receive at the end. If you are still deciding between the two shapes, our comparison guide covers that choice; this page is about replacing the frames well.

Replacing the frames is also a chance to improve the inside of the bay. New boards and trims can be fitted where the old ones were damaged when the frames came out, and the board can be finished to suit a window seat or a deep display shelf. Tell us at the survey how you use the space, because curtain tracks, blinds and radiators beneath the window all affect where openers and handles are best placed.