Window Replacement Cost Calculator
Best for estimating the cost of replacing existing windows, including frame material, number of windows, size, glazing type and installation complexity.
Estimate window replacement cost
Windows and doors cost calculators
Windows & Doors Cost Calculators UK
Estimate and compare UK window and door costs using calculators for window replacement, double glazing, front doors, patio doors and bifold doors. Start with the calculator that matches your project, then use the guidance on this page to understand what affects the final quote.
Choose the right windows and doors calculator
Each calculator is built for a different type of project. Use the window replacement calculator if you are replacing existing units, the double glazing calculator if you are comparing glazing upgrades, and the door calculators when the project is focused on an entrance, patio opening or bifold installation.
Double Glazing Cost Calculator
Best for estimating the cost of upgrading to double glazing, whether you are replacing several windows or planning a whole-property glazing project.
Estimate double glazing costFront Door Cost Calculator
Best for comparing front door costs by material, size, glazing, security specification, side panels, frame work and fitting requirements.
Estimate front door costPatio Doors Cost Calculator
Best for estimating sliding or French patio door costs, including opening size, frame material, glazing, removal of old doors and installation.
Estimate patio door costBifold Doors Cost Calculator
Best for larger openings, modern rear extensions and garden access projects where panel count, frame material and structural preparation can affect the quote.
Estimate bifold door costStart with the right question
The best calculator depends on whether you are replacing old units, upgrading glazing, changing an entrance door or opening up the back of the property.
I need to replace old windows
Use the Window Replacement Cost Calculator if the project is mainly about replacing existing windows like-for-like or upgrading the frame and glazing specification.
I want to improve warmth and reduce outside noise
Use the Double Glazing Cost Calculator if the main goal is better insulation, lower heat loss or replacing older single-glazed units.
I am replacing the main entrance door
Use the Front Door Cost Calculator to compare uPVC, composite, timber and aluminium door options, including glazing and security features.
I am replacing garden doors
Use the Patio Doors Cost Calculator if you are pricing sliding doors, French doors or a standard garden access replacement.
I want a wider opening to the garden
Use the Bifold Doors Cost Calculator if the project involves multiple folding panels, a wide opening or a more complex rear-of-house installation.
Windows and doors cost depends on size, specification and installation
Window and door quotes are shaped by more than the product itself. A small standard window is a different job from a large bay window, and a simple door replacement is different from fitting bifold doors into a wider opening. Frame material, glazing type, access, removal, finishing work and regional labour rates can all change the final price.
| Cost layer | What it includes | Where to calculate it |
|---|---|---|
| Window replacement | Number of windows, size, frame material, glazing and fitting. | Window Replacement Cost Calculator |
| Glazing upgrade | Double glazing specification, property size and number of units. | Double Glazing Cost Calculator |
| Entrance door | Door material, glazing, locks, frame and fitting. | Front Door Cost Calculator |
| Garden access doors | Patio door type, opening size, frame material and installation. | Patio Doors Cost Calculator |
| Wide openings | Bifold panel count, frame material, threshold, glazing and preparation. | Bifold Doors Cost Calculator |
Compare common window and door projects
Some projects are mainly product-led, while others are shaped by the opening, fitting work and preparation. This is why two quotes for windows or doors can look very different even when the product names sound similar.
| Project | Cost position | Best for | Calculator |
|---|---|---|---|
| Standard window replacement | Lower to mid range | Replacing old windows without major layout changes. | Window replacement |
| Double glazing upgrade | Mid range | Better insulation, comfort and noise reduction. | Double glazing |
| Front door replacement | Low to premium | Entrance upgrades, security features and kerb appeal. | Front door |
| Patio doors | Mid range | Garden access and rear-room improvements. | Patio doors |
| Bifold doors | Higher range | Wider openings, extensions and open-plan living. | Bifold doors |
What affects windows and doors cost?
The final cost usually comes from a mix of product specification and fitting conditions. A quote should be checked against what is included, not just the headline price.
Number and size of units
More windows or larger doors increase product and labour cost. Oversized units, bay windows and wide openings usually need more careful measurement and fitting.
Frame material
uPVC is often cheaper than aluminium or timber. Composite doors, aluminium bifolds and timber frames usually sit higher in the price range.
Glazing specification
Double glazing, toughened glass, laminated glass, acoustic glass, privacy glass and decorative glass can all change the price.
Installation complexity
Simple replacements usually cost less than projects involving damaged frames, uneven openings, structural preparation or difficult access.
Removal and disposal
Old windows, doors, frames and glass may need to be removed and disposed of. Some quotes include this clearly, while others separate it out.
Finishing work
Internal trims, making good, plastering, sealant, thresholds and exterior finishing can affect the final amount paid.
Typical UK windows and doors cost ranges
The ranges below are broad planning figures. Actual prices depend on size, specification, access, region and the condition of the existing opening.
| Project type | Typical planning range | Notes |
|---|---|---|
| Single window replacement | £400–£1,200+ | Size, frame material and glazing specification affect the price. |
| Whole-house window replacement | £4,000–£15,000+ | Depends on number of windows, property type and specification. |
| Double glazing upgrade | £4,000–£12,000+ | Whole-property cost varies by unit count and glass specification. |
| Front door replacement | £700–£3,000+ | uPVC is usually lower cost; composite, timber and aluminium can cost more. |
| Patio doors | £1,200–£4,000+ | Door type, width, frame material and glazing change the quote. |
| Bifold doors | £2,500–£8,000+ | Panel count, opening size, frame material and preparation are major drivers. |
Use the calculators above for estimates that reflect the project type rather than relying on a single average price.
Already have a window or door quote?
A window or door quote should show what is included. Check the number of units, frame material, glazing specification, removal of old units, disposal, trims, making good, VAT and any access requirements. A cheaper quote may exclude work that another installer has included.
If your quote is for several windows, start with the Window Replacement Cost Calculator or Double Glazing Cost Calculator. If the quote is for one main entrance or rear access project, use the Front Door, Patio Doors or Bifold Doors calculator instead.
The hidden cost: fitting, finishing and access
The product price is only part of the total. Installation time, access, removal, disposal, sealants, trims, thresholds and making good can all affect the quote. Large glass units, upper-floor windows and wide door openings may need more labour and care during fitting.
Use the relevant calculator when comparing quotes so the estimate reflects the actual job rather than a general average.
Planning wider home improvement work?
Window and door costs often overlap with other parts of a renovation. New bifold doors may be linked to an extension, patio works or interior changes. Window replacement may sit alongside insulation, heating upgrades or wider energy improvements.
Compare related planning tools in the extensions cost calculators, interior cost calculators, energy and heating cost calculators and landscaping cost calculators.
How CostIntel estimates windows and doors costs
CostIntel windows and doors calculators estimate costs using project type, number of units, size, frame material, glazing specification, fitting complexity, removal, finishing work, access and region. Each calculator has a specific role, from whole-window replacement estimates to single-door and wider-opening projects.
For more detail, read our methodology, pricing data and how costs are calculated.
Windows and doors cost FAQs
How much do new windows and doors cost in the UK?
Small individual replacements can cost hundreds of pounds, while whole-house window and door projects can run into several thousand pounds. The final cost depends on the number of units, size, frame material, glazing, fitting work and region.
What is the cheapest window frame material?
uPVC is usually the lowest-cost common frame material. Aluminium and timber usually cost more, although the final quote still depends on size, glazing and installation.
Is double glazing worth pricing separately?
Yes. Double glazing cost depends on the number of units, glass specification, frame type and fitting work. Pricing it separately can make it easier to compare quotes.
Why do window replacement quotes vary so much?
Quotes vary because window size, frame material, glazing, access, removal, disposal and finishing work can all differ. Two quotes may not include the same scope.
How much does a front door cost?
A front door can range from a lower-cost uPVC replacement to a higher-cost composite, timber or aluminium door with upgraded glazing and security features.
Are bifold doors more expensive than patio doors?
Bifold doors are often more expensive because they usually involve multiple panels, wider openings, more hardware and more detailed installation. Patio doors are often simpler, depending on the style and size.
Do window and door quotes include removal of old units?
Some quotes include removal and disposal, while others separate it out. Always check whether old frames, glass, trims and waste disposal are included.
Are CostIntel estimates fixed quotes?
No. CostIntel estimates are planning figures based on typical UK cost drivers. A contractor needs to inspect and measure the property before giving a fixed quote.