Before You Sign a Double Glazing Contract

📅 Updated April 2026 · ⏱ Full guide in progress · ✍️ Findfitter Team

Double glazing contracts commit you to thousands of pounds of spend and weeks of work on your home. Never sign the same day — and never sign without these 10 things in writing.

The 10-point pre-signing checklist

1. Fixed total price — no “estimated” wording. VAT shown separately.
2. Itemised breakdown — product, labour, scaffolding, disposal, FENSA cert all listed separately.
3. Product specification — frame brand (Rehau, Deceuninck, Veka), energy rating (A++/A+/A), glass type (argon-filled, low-e), PAS 24 security.
4. Start and completion dates with compensation clause for unexcused delays beyond 2 weeks.
5. Payment schedule — deposit (max 25%), interim (on delivery), final (post-install inspection).
6. 14-day cooling-off period — your legal right under Consumer Contracts Regulations 2013 for doorstep sales.
7. Insurance-backed warranty — 10 years, covering both product and workmanship.
8. Installer credentials — FENSA/Certass membership number printed on the contract.
9. Making-good clause — who’s responsible for plaster or external render repair during install.
10. Cancellation terms — deposit-protection details (FENSA scheme is standard).

Red flags to reject

• “Valid today only” pricing — legitimate quotes last 14–30 days
• Deposits above 25% — never hand over most of the money upfront
• Vague product spec (“standard uPVC” with no frame brand or rating)
• Cash-only payment — lose Section 75 chargeback protection
• Verbal promises not reflected in the written contract

Our full contract-review walkthrough (with a free downloadable checklist PDF) is being finalised. In the meantime, get multiple quotes so you can compare contracts side-by-side:

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Sources & references

This article draws on data and guidance from the following authoritative UK sources:

• Consumer Contracts Regulations 2013 — 14-day cooling-off period for doorstep sales
• Citizens Advice — consumer rights — full UK consumer rights under the Consumer Rights Act 2015
• Financial Conduct Authority — consumer credit — regulated rules for UK finance agreements
• GOV.UK — consumer protection rights — statutory rights for UK purchases
• Consumer Credit Act 1974 — Section 75 — credit-card chargeback protection for purchases over £100