Bay Windows


Bay windows enhance many developments and provide aesthetic design solutions in both traditional and modern installations. Be it a replacement for an existing window or a new-build installation the following pages are designed both to help you through the process of correctly ordering your bay window and to show some of the bay window design solutions available. From Oriel to Square, Arborfield Joinery has a bay window to suit your needs.

Please call us on 0118 973 5210 for details.

Installation and Building Regulations Part ‘L’

Bay windows, whether square or splay (angled), need careful consideration when you are planning building detail and installation. The Building Regulations Approved Document ‘L’ require the thermal performance around openings to achieve levels that some traditional methods of bay window installation cannot meet. (The same applies to plain flat windows, but in those situations the solution is relatively straightforward.)

Traditionally, the various types of bays were set against plain brickwork with the joints made by butting the jambs, or corner posts, up to the brickwork. In some situations, a ‘birds-mouth’ detail was used to set the bay window into the corner of the brickwork. Most of these details create a ‘cold bridge’ at this joint, which is unacceptable under current regulations.