Key takeaways

• Window replacement costs vary significantly based on style, material and glazing type, with casement windows typically starting from around £300, whilst bay windows can exceed £2,400
• uPVC windows are the most affordable option for most homeowners, with timber frames costing approximately 50% more and aluminium windows around 25% more than standard uPVC
• Double glazing remains the most popular choice for UK homeowners, balancing cost with excellent energy efficiency to help reduce heating bills
• Installation costs typically add £80 per frame, with additional expenses for scaffolding and waste removal potentially increasing your total project cost
• The size of the window, the number of windows being replaced, and any customisation options will all impact your final quote

Replacing your home’s windows is one of those home improvement projects that can feel overwhelming, especially when you’re trying to work out window costs. The truth is, there’s no one-size-fits-all answer to how much to replace house windows. According to recent data from Checkatrade, you could be looking at anywhere from around £300 for a simple casement window right up to £5,000 or more for an elaborate bay window.

At FineView Windows & Doors, we believe in transparent pricing and helping you understand the cost of new windows. Whether you’re replacing old windows in a period property or upgrading your entire home with energy-efficient double glazing, this guide will help you set a realistic budget.

What impacts the cost of replacement windows?

Several factors influence window replacement costs, and understanding these will help you budget accurately.

Style of window

The window style you choose has a substantial impact on overall window prices. Simple casement windows tend to be the most affordable option, whilst more elaborate designs like bay windows or sash windows command higher prices due to their complexity.

Frame material

The frame material represents one of the most significant cost variables. uPVC frames offer excellent value whilst requiring minimal maintenance. Timber frames bring natural beauty but typically cost around 50% more than uPVC. Aluminium frames usually cost about 25% more than uPVC whilst offering a sleek, contemporary appearance.

Type of glazing

Your choice between double glazing and triple glazing affects both upfront costs and long-term energy savings. Double glazing remains the standard choice, offering excellent energy efficiency to reduce heating bills. Triple glazing adds a third pane of glass for even better insulation but comes with a higher upfront cost.

Installation costs

Beyond the windows themselves, window installation typically costs around £80 per frame. You might also need scaffolding for upper-floor windows, waste removal services and “making good” work around the new frames.

How much does it cost to replace a house window by style?

The type of window you select will significantly influence your overall cost of replacement. Data courtesy of Checkatrade as well as our own recent installations for reference.

Casement windows

Casement windows are hinged at the side and swing outwards, offering excellent ventilation. You’ll typically pay between £300 and £550 per single window depending on size and frame material. For a typical three-bedroom house, budget around £6,500 to £8,000 for new windows throughout. uPVC casement windows offer the most affordable solution for most homeowners.

Bay windows

Bay windows create a stunning focal point whilst adding valuable floor space. Their complex construction makes them considerably more expensive, often double the cost of standard casement windows. A three-section bay window typically costs between £950 and £1,500, whilst five-section designs can reach £1,800 to £2,500.

Flush sash windows

Flush sash windows sit completely flush with the outer frame when closed, creating an authentic period appearance. They’re perfect for conservation areas where traditional aesthetics matter. Prices typically start from around £500 for uPVC versions, with timber windows commanding significantly more.

Sliding sash windows

Sliding sash windows are synonymous with period properties, featuring two panels that slide past each other for that classic Georgian or Victorian look. These traditional sash windows cost approximately 50% more than casement windows. White uPVC sash windows typically range from £500 to £650 for smaller sizes, whilst larger windows cost between £580 and £750.

How much does it cost to replace a house window by material?

Understanding new window costs by material helps you make an informed decision about the best option for your home.

uPVC windows

uPVC windows represent the best value option, combining affordability with excellent performance. Standard white uPVC casement windows typically cost between £450 and £1,300 per window. New uPVC windows require minimal maintenance, just an occasional wipe-down. uPVC frames in standard sizes offer excellent thermal efficiency whilst keeping costs manageable.

Coloured uPVC windows have become increasingly popular. Grey anthracite finishes and wood effect uPVC options offer contemporary style without the ongoing maintenance of timber windows. These typically cost between £300 and £400 for casement styles.

Aluminium windows

Aluminium frames offer slim sightlines and modern aesthetics. However, an aluminium window comes at approximately 25% more than equivalent uPVC. Standard aluminium windows typically cost between £325 and £625. Aluminium window frames are virtually maintenance-free and incredibly long-lasting as well as being renowned for allowing more natural light into the building due to slimmer frames, making them ideal for contemporary home improvement projects.

Timber windows

Timber frames bring unmatched natural beauty. Real wooden windows offer warmth particularly valued in period properties. However, timber windows typically cost at least 50% more than uPVC alternatives. A timber casement window averages around £850 to £1,050, whilst timber sash windows command £1,350 to £1,900. Wooden windows require ongoing maintenance including regular painting or staining.

Overview of average cost for replacement windows

Window style	uPVC (average)	Aluminium (average)	Timber (average)
Casement	£450-£1,300	£550-£1,500	£850-£1,550
Sash	£650-£1,550	£750-£1,800	£1,350-£1,900
Bay (3-section)	£1,000-£1,500	£1,250-£1,800	£1,500-£2,200
Flush sash	£500-£1,400	£600-£1,600	£900-£1,700

Note: Average prices include supply and installation for standard sizes. Actual costs may vary.

New windows from FineView

At FineView Windows & Doors, we offer an extensive range of replacement windows in casement, bay, flush sash and sliding sash styles. Options are available in uPVC frames, aluminium frames and timber windows to suit every property type and budget.

We understand the importance of energy efficiency. Our range of double glazing helps reduce heat transfer, keeping your home warm in winter and cool in summer, leading to significant energy savings and lower heating bills. We pride ourselves on offering highly customisable windows in a vast array of designs, colours and finishes, from classic white uPVC to wood effect and contemporary anthracite grey, ensuring you get windows that complement your home’s aesthetics beautifully.

Frequently asked questions

How much new windows cost for a whole house?
For a standard three-bedroom semi-detached house with around eight windows, the cost of replacement windows is approximately £6,500 to £10,000 for uPVC casement windows including window installation. The exact cost depends on the size of the window, number of windows, your chosen material and customisation options.

Is it worth replacing old windows?
Absolutely. Replacing old windows, particularly single glazing with modern double glazing, dramatically improves energy efficiency, reduces heating bills and makes your home more comfortable. Modern windows also offer better noise reduction if you live on a busy road and can increase property value.

Do I need permission to replace windows?
In most cases, replacing like-for-like existing windows doesn’t require planning permission according to UK building regulations. However, if you live in a listed building or conservation area, check with your local council before proceeding.

Who are FineView Windows & Doors?

At FineView Windows & Doors, we help UK homeowners transform their properties with quality replacement windows. With years of experience, we’ve built our reputation on expert advice, quality products and professional window installation throughout the United Kingdom.

We offer a comprehensive range including casement windows, bay windows, flush sash windows and sliding sash windows in uPVC frames, aluminium frames and timber windows. All our new windows are designed with energy efficiency at their core, helping reduce your heating bills whilst minimising your environmental impact.

Ready to discuss your window replacement project? Get in touch with our friendly team today for expert advice and a detailed quote based on accurate measurements and your specific requirements. Contact FineView Windows & Doors for competitive pricing on all your window replacement needs.