Window and door guarantees, what to check
Frame guarantees commonly run 10 years, glazing unit guarantees are often shorter — ask specifically, since a failed seal (misting between panes) is a glazing unit issue, not a frame issue, and needs to be covered by the right guarantee. Installation workmanship guarantees are usually separate again.
Window regulations, FAQ
Do I need a certificate for a single window replacement? Yes, the same Part L rules apply whether it's one window or the whole house. Can I fit my own windows? Technically yes, but you'd then need a separate council building control inspection, which most installers' FENSA/CERTASS registration avoids automatically.
Windows in extensions and new builds
New-build glazing has to meet Part L from the outset, same as replacement windows, and is usually specified alongside the wider build rather than as an afterthought — window position and size affects room lighting and ventilation calculations the rest of the design depends on.
What a good window quote should include
A proper quote should state frame material and colour, glazing spec, whether old windows/frames are removed and disposed of, the FENSA/CERTASS certificate, and the guarantee length on both frames and glazing units, which can differ.
Windows and noise reduction
Standard double glazing reduces noise somewhat, but for a genuinely noisy location (busy road, flight path), acoustic glazing with a wider gap between panes or laminated glass makes a bigger difference than upgrading to triple glazing for thermal reasons alone.
Restoring vs replacing original windows
Original timber windows in reasonable structural condition can often be restored — new sash cords, draught-proofing, re-glazing with slimline double glazing units designed for period frames — at lower cost and disruption than full replacement, and is sometimes the only option allowed on listed properties.
Three steps to hiring the right window installer
First, confirm FENSA or CERTASS registration and ask to see the number. Second, get a written quote specifying frame material, glazing spec (U-value) and whether the certificate is included. Third, ask about the guarantee — on both the glazing units and the installation work separately.
Common window and door jobs
Window specialists handle full window replacement, double glazing unit repairs (a fogged unit usually means a failed seal, not the whole frame), door replacement, conservatories, and draught-proofing. Composite and bifold doors are increasingly common alongside standard uPVC window replacement.