If you are asking how much do new windows cost, the honest answer is usually £350 to £1,200 per window fitted for common replacement windows in the UK in 2026.
A typical three-bedroom semi with 8 to 10 windows may cost roughly:
- £3,750 to £7,500 for white uPVC
- £5,000 to £11,000 for aluminium
- £7,500 to £15,000 or more for timber
- More for several sash, bay, oversized or heritage windows
These are guide prices, not promises. The final figure depends on the actual measurements, materials, window styles, glazing and installation conditions at your home.
Published cost guides from the Federation of Master Builders and MyJobQuote show why online estimates can vary widely.
How much do new windows cost per window?
A standard white uPVC casement window normally costs around £350 to £700 fitted. Aluminium is often £550 to £1,100, while timber commonly starts around £850 and can exceed £1,800. Larger, unusual or period windows cost more.
| Window type | Typical fitted cost in 2026 |
|---|---|
| White uPVC casement | £350–£700 |
| Coloured or woodgrain uPVC casement | £450–£800 |
| Aluminium casement | £550–£1,100 |
| Timber casement | £850–£1,800+ |
| uPVC sash | £700–£1,200 |
| Timber sash | £1,500–£2,500+ |
| Three-section uPVC bay | £1,500–£2,500 |
| Larger or period bay | £2,500–£4,500+ |
These ranges assume a reasonably straightforward replacement with double glazing. They may include installation, but you should always check whether the quote includes VAT, removal of old frames and disposal.
Some online guides show lower prices because they list the window unit alone. That is not the same as the price you pay to have it measured, delivered and installed.
What does it cost to replace all the windows in a house?
For an average three-bedroom semi-detached house with 8 to 10 windows, allow about £3,750 to £7,500 for standard uPVC. Aluminium, timber, bay windows, sash windows and premium glazing can push the project well above £10,000.
A rough whole-house guide looks like this:
- Two-bedroom terrace, 6 to 8 windows: £2,500–£5,500 for uPVC
- Three-bedroom semi, 8 to 10 windows: £3,750–£7,500 for uPVC
- Four-bedroom detached, 10 to 15 windows: £5,500–£11,000 for uPVC
- Larger homes with aluminium or timber: £7,000–£20,000 or more
The number of windows is only the starting point. Ten standard casement windows are much easier to price than six casements, two sash windows, a bay and a large upstairs opening.
Replacing several windows at once may reduce the average cost per window because the installer can plan the work as one project. It also avoids paying for separate surveys, deliveries and installation visits.
Which window frame material is cheapest?
White uPVC is usually the cheapest option for replacement windows. Aluminium costs more but offers slimmer frames, while timber is typically the most expensive because it suits traditional designs and needs more specialist manufacture and maintenance.
uPVC
uPVC is the usual budget-friendly choice. It is widely available, low-maintenance and suitable for many modern homes.
A standard white uPVC casement is often around £350 to £700 fitted, depending on size and specification. Coloured, woodgrain or flush-fit uPVC usually costs more.
Aluminium
Aluminium frames are stronger and can have slimmer sightlines than uPVC. This makes them popular for modern homes, extensions and larger glazed openings.
Allow roughly £550 to £1,100 per standard aluminium window fitted. Larger frames, special colours and high-performance glazing can increase the price.
Timber
Timber is often chosen for period properties, conservation areas and homeowners who want a traditional finish.
A timber casement may cost £850 to £1,800 or more, while bespoke timber sash windows can cost considerably more. Timber can last for decades when properly maintained, but repainting and repairs should be included in your long-term budget.
How much do casement, sash and bay windows cost?
Casement windows are normally the most affordable. Sash windows cost more because of their sliding mechanisms, while bay windows cost more again because they combine several frames and usually require more complex fitting.
- Casement windows: around £350–£700 for standard white uPVC
- Sash windows: around £700–£1,200 for uPVC and £1,500–£2,500+ for timber
- Bay windows: around £1,500–£2,500 for a typical three-section uPVC bay
- Bow windows: often similar to, or more expensive than, a bay because they use several connected sections
Bay and bow windows can also involve extra work around the structure, cills, internal reveals and external trim. A quote that looks cheap online may not include these details.
How much more is triple glazing than double glazing?
Triple glazing commonly adds around 10% to 30% to the cost of comparable double-glazed windows, although the increase varies by frame, glass specification, size and supplier. It is not automatically the best choice for every room.
A standard uPVC double-glazed casement may cost around £350 to £700 fitted. A comparable triple-glazed version could be roughly £550 to £900, depending on the exact product.
Triple glazing may improve thermal performance and reduce outside noise. However, it is heavier, can require stronger hardware and may not deliver enough extra benefit to justify the cost in every property.
Ask for both options on the same written quote. Check the window energy rating, glass make-up, U-value and whether the price includes upgraded hinges, frames or ventilation.
Are trickle vents included in the cost of new windows?
Trickle vents are often included in standard replacement window quotes, but not always. Confirm this before accepting a price, especially if your existing windows have vents or your home has condensation and ventilation problems.
Trickle vents are small controllable openings, usually near the top of the frame. They allow background ventilation when the window is closed.
A basic vent may be included. Colour-matched, metal-finish or acoustic vents can cost extra, often by a modest amount per window. The important point is to compare like for like.
Do not remove ventilation without understanding the consequences. Better-sealed windows can expose existing airflow problems, particularly in kitchens, bathrooms and bedrooms.
What is included in a new window quote?
A proper quote should list the window material, size, style, glass, energy rating, hardware, installation, old-window removal, waste disposal and finishing work. If any of these are missing, ask for clarification before comparing prices.
Check whether your quote includes:
- A measured survey
- Window frames and glass
- Handles, locks and hinges
- Cills, trims, fixings and sealant
- Trickle vents or other ventilation
- Removal of old windows
- Responsible disposal of waste
- Internal and external making good
- Scaffolding or access equipment
- VAT
- Installation certification
- Product and workmanship guarantees
Some installers include most of this as standard. Others list certain items as optional extras. Neither approach is necessarily wrong, but the quote must be clear.
You should also confirm whether the installer is registered with a competent person scheme such as FENSA or Certass, or whether building control approval will be needed separately.
What can make replacement windows more expensive?
The biggest price increases usually come from non-standard sizes, difficult access, period properties, premium materials, specialist glass, bay or sash designs, scaffolding and extra work needed around the existing openings.
The main cost drivers are:
- Frame material: uPVC is usually cheapest; aluminium and timber cost more.
- Window style: sash, bay and bow windows need more parts and labour.
- Glass specification: triple, acoustic, laminated, toughened and solar-control glass add cost.
- Number of windows: larger projects may reduce the average price, but increase the total.
- Trickle vents: specialist or acoustic versions may cost more.
- Location: London and the South East often have higher labour and operating costs.
- Access: upper floors, narrow access and scaffolding can add time and cost.
- Property condition: rotten timber, damaged brickwork, plaster or sills may need repair.
- Planning restrictions: listed buildings and conservation areas may require specialist designs or permissions.
Why is a measured survey better than an online estimate?
An online estimate can help you set a rough budget, but only a measured survey can account for the real opening sizes, access, frame condition, ventilation, installation details and property restrictions that determine your final window cost.
Windows are rarely identical from one house to the next. Openings can be slightly out of square. Brickwork can have moved. Previous installations may have used different sizes or materials.
A proper survey should check the opening, surrounding structure, cills, access, ventilation and the way each window needs to open. It also gives you a chance to discuss security, noise, energy efficiency and appearance before anything is ordered.
Be wary of any supplier offering a firm final price without seeing the property. A guide price is useful. A guaranteed installation price needs proper measurements.
How should I compare quotes from window fitters?
Get at least two or three written quotes and compare the specification, not just the headline price. The cheapest quote may exclude disposal, ventilation, making good, certification or the glass and frame quality you actually need.
Ask each installer to quote for the same:
- Number and size of windows
- Frame material and colour
- Casement, sash or bay style
- Double or triple glazing
- Energy rating and U-value
- Trickle vents
- Handles and locks
- Installation and removal
- VAT
- Guarantee
- Completion timescale
Look for a clear local business with relevant experience. If you need replacement windows, speak to local window fitters who can explain the options and arrange a measured survey. For specialist upgrades to existing frames, a secondary glazing specialist may be a better fit than a full replacement company.
Homeowners often search online for prices before they contact a fitter. Businesses that answer those questions clearly, show realistic ranges and make it easy to request a quote are more likely to earn the enquiry.
What can window fitters do to win more quote requests?
Window fitters win trust earlier when their websites answer practical questions about price, materials, styles and installation. Clear cost guidance gives homeowners confidence before they pick up the phone or submit a quote request.
If you run a window fitting or double glazing business, check whether your website appears when local customers search for the services you provide.
Request a VU1 audit and enter your website address. It takes under 15 seconds to request, and the report lands within a few minutes. It shows the local, on-page and technical issues that may be costing you enquiries, in plain English.
A VU1 membership costs £99 per month and combines visibility checks with practical tools to help turn website visits into quote requests. The aim is simple: help good local trades businesses get found and make it easier for homeowners to take the next step.
So, how much should you budget for new windows in 2026?
For a straightforward standard uPVC replacement, budget around £350 to £700 per window. For a typical three-bedroom semi, allow £3,750 to £7,500, then adjust for materials, styles, glazing, access, location and any repair work.
Use online prices as a starting point, not a final answer. Get a measured survey, request a detailed written quote and compare the specification line by line.
The right price is not always the lowest one. It is the price for windows that fit properly, meet the required standards and are installed by a business that will still answer your call if something needs attention later.