Part L1B 2026 Notice:All replacement windows in England & Wales must achieve whole-window U-value ≤ 1.4 W/m²K with FENSA/Certass certification or Council LABC sign-off.
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Last updated: March 2026

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By accessing and using upvcwindowcalculator.co.uk, you accept and agree to be bound by these Terms of Use and our Privacy Policy.

2. Estimations & Information Disclaimer

The pricing calculations and energy efficiency figures provided on this site are indicative estimations based on prevailing 2026 UK market rates and Building Regulations Approved Document L1B standards. Exact quotations are subject to on-site survey, aperture structural condition, scaffolding requirements, and installer specifications.

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uPVCWindowCalculator.co.uk is an independent pricing intelligence desk operated by Tarquin Barnsby (trading as uPVCWindowCalculator.co.uk) (ICO ZC136598). We do not manufacture windows or perform on-site fitting directly; quotations are delivered by independent certified trades.