How Much Does Bay Window Cost?
Bay window prices vary depending on size, number of panels, frame material and whether you are replacing existing bay windows or creating a new structural opening. This guide covers typical costs to help you budget.
Typical Bay Window Prices 2026
| Item | Details | Typical Cost |
|---|---|---|
| Small bay window (uPVC, 2-panel) | Replacement | £800 – £1,500 |
| Medium bay window (uPVC, 3-panel) | Replacement | £1,200 – £2,500 |
| Large bay window (uPVC) | Replacement | £2,000 – £3,500 |
| Aluminium bay window | Replacement | £2,500 – £5,000 |
| Timber bay window | Replacement | £2,000 – £5,000 |
| New bay window opening | Structural work included | £3,000 – £8,000+ |
Prices are indicative guides only. Actual costs depend on your property, location and chosen installer. Always compare multiple quotes to ensure you are getting a fair price for quality work.
Compare Prices by Type
Explore our detailed price guides for each type to find the best option for your home.
uPVC Bay Window Prices
The most affordable bay window option. uPVC offers excellent energy efficiency and requires no maintenance.
Aluminium Bay Window Prices
Slim, modern aluminium frames create a premium appearance while maximising glass area.
Timber Bay Window Prices
Traditional timber frames offer unmatched character and charm. Require regular maintenance but can last decades.
Frequently Asked Questions
How much does a bay window cost?
A standard uPVC double glazed bay window typically costs between £800 and £2,500 supplied and fitted. Aluminium and timber frames cost more.
How long does bay window installation take?
A bay window replacement typically takes 1-2 days. New structural openings may take 2-3 days depending on the work required.
Do I need planning permission for bay windows?
Replacing existing bay windows like-for-like does not usually require planning permission. Creating a new opening may require permission depending on your property.
How can I save money on bay windows?
Comparing at least 3 quotes from local FENSA accredited installers is the most effective way to save money.
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