Windows / Bay
Bay window installation
A bay window projects out from the wall as three units set at angles — usually a fixed picture window flanked by two operable double-hung or casement units. It adds floor-adjacent depth, a sill you can sit on or plant on, and a lot of light.
How it works
The center unit is typically fixed for the view; the two angled side units open for ventilation. The assembly is supported below and tied in above, and the roof of the projection is flashed and often finished in copper or metal.
Where it fits well
- Living rooms, dining rooms and primary bedrooms facing a yard or view
- Adding a window seat or a deep plant shelf
- Rooms that feel tight — a bay borrows a few feet of visual space
What to weigh
- A bay is a small piece of construction, not just a window: it needs proper support, insulation of the seat board and head, and a weather-tight roof
- Exterior roofing for the projection (metal or copper) is specified with the unit
- Lead time and cost are higher than a flat replacement of the same opening
Questions
Bay — good to know
What holds a bay window up?
Depending on the size and how the original was built, a bay is supported by a system of cables and brackets from above, a knee-brace assembly from below, or both. We assess the existing framing during the estimate.
What is the difference between a bay and a bow window?
A bay is three units at sharper angles and reads as an angular projection. A bow is four or more units at gentler angles that curve. A bay usually projects further for a given wall width; a bow gives a softer, rounded line.
Other window styles
More window styles
Next step
A better view starts here.
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