Bay window cost
A bay window makes a room feel bigger and floods it with light — but it costs more than a flat window of the same width, and it helps to know why. As a typical bay window cost guide, a front brick bay sits in the region of £1,400–£2,800 supplied and fitted, depending on size, the number of facets and the glazing you choose.
Why a bay costs more than a flat window
A bay is several windows joined at angles, so it uses more frame and glass than a single flat opening. It also needs corner posts and, on many homes, a structural head to carry the load above the bay while the old frame is out. As a rough rule of thumb, a bay build-up costs in the order of 1.5–1.8× the equivalent run of flat windows once that extra material and support is included.
| Bay type | Typical supply & fit |
|---|---|
| Small three-facet uPVC bay | £1,400–£2,000 |
| Standard front bay | £1,800–£2,800 |
| Large or two-storey bay | £2,800–£4,500+ |
These are illustrative typical ranges. Structural work, the height of the bay and difficult access all move the figure, so a survey is especially important for bays.
Get a real bay window price for your home, confirmed on survey.
Get my estimate →
What changes a bay window estimate
- Number of facets: a five-facet bow costs more than a three-facet bay of the same width.
- Structural support: where a load-bearing head is needed, that adds to the labour.
- Storey height: a two-storey bay or one needing scaffolding costs more to fit.
- Glazing and colour: the same upgrades that affect any window apply here too.
If you are pricing a bay as part of a wider project, it helps to understand the window installation cost that sits behind the fitting, and to compare the bay against the plain-window cost per window so you can see the premium clearly.
Compare free bay window quotes from vetted local installers.
Start my estimate →