Bay window extension guide
A bay window adds character and daylight, but because it is often visible from the street, detailing and permits matter.
Bay windows are compact compared with rear extensions, yet they have a strong visual impact.
The design must work with the facade, roofline, window proportions and municipal appearance rules.
Designing the bay
A good bay window looks like it belongs to the house. Brickwork, frames, roof edge and proportions should match or deliberately complement the existing facade.
For 1930s homes, small details such as sill height and frame divisions make a big difference.
Permit expectations
A bay window at the front usually needs a permit because it changes the street facade.
Side bay windows can also be permit-sensitive when they face public space or neighbours.
Cost drivers
Costs depend on size, foundation, glazing, roof shape and matching materials.
Although the surface area is small, bespoke detailing can make a bay window relatively intensive per square metre.
Summary
A bay window is a detail-led project: get the proportions and materials right before focusing on size.
Need help with your project?
We are happy to help. View the relevant services or request a quote directly.