Disclaimer

Cost guides and calculators on Sash Cost Guide are AI-researched and verified against real contractor quotes from Checkatrade, MyBuilder and FENSA-certified installers.

Actual costs vary by location, window condition, access difficulty and contractor. Use our calculators as guidance, not fixed quotes.

For listed buildings or conservation areas, consult your local conservation officer before proceeding. For structural concerns, consult a chartered surveyor.

We cite primary sources for all factual claims. We are not professional surveyors, contractors or heritage consultants.