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A window cost and area calculator helps estimate the number of windows needed for a new building, replacement cost for existing windows, or the glazing area for planning and building regulations compliance.

Steg-för-steg-guide

1. 1Measure each window opening: width × height = area in m²
2. 2Sum all window areas
3. 3Building regulations: windows + roof lights typically cannot exceed 25% of floor area for heat loss reasons
4. 4Cost estimate: standard double-glazed window: £300–800 supply-only depending on size

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