UK price guide · Updated 26 Sep 2026
Bow Window Cost
Bow windows use several joined sections to create a curved or faceted projection. As a working replacement-window comparison, the current multi-section model centres around £2,350 for four sections and £2,850 for five sections.
Current price examples
These examples use the same current pricing engine as the calculator. They are market estimates rather than binding installer quotations.
Bow window versus bay window cost
Both use multiple joined window sections and require more fitting work than a flat casement. A bow normally creates a softer curve using more equally sized sections, while a bay often has a wider centre face and angled returns. Exact structural and cill details vary between properties.
Why these estimates are wider
Projecting windows are much more property-specific than a flat casement. Existing support, bay poles, roof/cill condition, angles and making good can all affect the finished cost, so the calculator intentionally uses a wider uncertainty range for this category.
What affects the price?
- Number of framed sections
- Existing support and cill condition
- Colour and glazing choice
- Whether the project is replacement or new construction
What “fitted” means here: supply, standard replacement installation and ordinary 20% VAT are included. Unusual access, scaffolding, structural repairs, planning/listed-building requirements and highly bespoke work can sit outside the standard estimate.
Related price guides
Compare the closest related costs, then use the calculator for your own specification.
Questions people ask
Short answers to the most useful questions around this price topic.
How much does a bow window cost?
A four-section replacement comparison centres around £2,350 and a five-section version around £2,850 in the current model.
Is a bow window the same as a bay window?
Not exactly, but both are multi-section projecting window systems and share many of the same cost drivers.
Does this cover building a brand-new projection?
No. These figures are for replacement-style projects, not constructing a new bay or bow from the wall out.
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