Double Glazing Cost Calculator
Find out how much your window project will cost in just a few simple steps.
Your exact quote will be sent directly to your inbox.
Step 1: Choose Your Window Type
Step 2: Choose Frame Material
Step 3: Enter Window Size
Measurements don’t need to be exact — we’ll confirm everything.
Step 4: How Many Windows?
Step 5: Is This Replacement or a New Installation?
Estimate Cost
Get Instant Estimates of Double Glazing
for uPVC, Aluminium, and Timber Windows
Our free calculator helps you understand what you’ll pay based on your exact requirements, from material choice and window size to energy ratings and installation preferences. Simply input your specifications to receive instant estimates for supply-only prices or fully fitted costs, complete with FENSA-compliant installation where required.
This calculates real-world pricing across uPVC windows, aluminium frames, heritage-style options, and traditional timber installations, giving you the clarity you need to budget confidently.
How does the window prices calculator work?
The double glazed windows calculator guides you through a straightforward step-by-step process. Start by selecting the window type you need, then choose the frame material. After that, enter the size of each window, add the quantity, and confirm whether your project involves new installations, replacements or secondary glazing.
Once these details are selected you can request the exact estimated double glazing windows cost quote at the last step.
For Which Window Styles Can You Calculate Costs?
In our window quote calculator, you can get an estimated price for casement windows in a range of styles, including bow and bay, shaped, cottage, and tilt and turn designs. You can also calculate the cost of sliding sash windows in uPVC, timber, and aluminium.
Price Ranges Across Window Materials
Realistic cost expectations are key to confident specification and avoiding budget surprises. Here’s the typical cost range for UK homeowners and trade customers by material.
uPVC window cost starts from approximately £350–£500 per window for supply-only standard casement windows in white. Fitted uPVC window prices generally range between £450–£750 per window, depending on size, specification, and regional installation rates.
Aluminium window prices begin around £600–£900 per window for supply only, with fitted costs typically between £800–£1,400 per window. Premium specifications, powder-coated finishes in architect-specified colours, and slimline profiles command higher prices.
Timber window prices span a broader range due to material grade and joinery complexity. Supply-only timber windows start from approximately £700–£1,000 for painted softwood casements, rising to £1,200–£2,500+ for engineered hardwood or oak frames.
Measuring Your Windows for Accurate Calculator Estimates
Precise measurements ensure your calculator results reflect the actual windows you’ll need, avoiding underestimates or specification errors.
To calculate and know the cost for your replacement windows using our double glazing replacement cost calculator, measure the existing frame’s width and height at three points top, middle, and bottom for width; left, centre, and right for height. Include the frame itself in your measurements, as replacement windows typically fit within the existing opening with minimal adjustments to brickwork or reveals.
For new installations, measure the structural opening, the clear space in the wall where the window will sit. Your supplier or installer will then deduct appropriate tolerances for frame installation, weather sealing, and adjustment.
Tip: For accuracy, always measure the width and height using both millimetres and centimetres.
Fitted Cost vs Supply Only: What You’re Actually Paying For
Understanding the distinction between supply-only windows and fully fitted installations helps you evaluate quotes accurately and determine the right approach for your project.
Supply-only prices cover the manufactured windows themselves, frames, glazing, hardware, and finishing that is delivered to your address. This option suits experienced trade customers, self-builders, or homeowners employing their own trusted installers.
Fitted cost encompasses both product and professional installation by qualified technicians. This inclusive pricing typically includes site survey, removal of existing windows where applicable, installation of new units with appropriate weather sealing and insulation, disposal of old frames, and provision of FENSA certification or Building Control approval.
The gap between supply-only and fitted prices, typically £100–£400 per window, depending on complexity.
Talk to our experts
If you want an exact cost for your double glazed windows then we recommend that you should contact our expert team who are ready to help and guide you.
Explore our product range
Check our double glazed windows product range available in different styles and material
💡 (Useful Tip)
Factors that can raise the cost of window fitting:
- Tough to reach windows: If scaffolding is needed for high places.
- Extra fixing work: If frames or sills are very damaged.
- Special glass disposal: Getting rid of materials like leaded or stained glass.
- Old building rules: If your property is listed or in a protected area, special permits and methods cost more.
