UK's trusted glazing calculator
Get an instant
double glazing
cost estimate
Answer 10 quick questions to receive a personalised price range based on current UK market rates.
50,000+
Estimates given
£155
Avg. annual saving
UK's trusted glazing calculator
Get an instant
double glazing
cost estimate
Answer 10 quick questions to receive a personalised price range based on current UK market rates.
50,000+
Estimates given
£155
Avg. annual saving
What type of property do you have?
This helps us estimate the number of windows and the right installation approach.
No account needed · Free to use · No obligation
Common Questions
How accurate is this estimate?
Our estimates are based on current 2025/26 UK market data and are typically within 15–20% of actual quotes. A free home survey from a local installer will give you an exact price.
Why is scaffolding included separately?
Scaffolding is a real cost that many calculators hide. For upper floor windows, a typical residential scaffold costs £600–£1,200. We show it upfront so you can budget accurately.
What is FENSA certification?
FENSA is a government-authorised scheme that ensures window installations comply with Building Regulations. You will need a FENSA certificate when selling your home.
Could I be eligible for a free grant?
Low-income households receiving certain benefits may qualify for the ECO4 scheme, which can fully fund window upgrades. Ask your installer about eligibility.