Double Glazing Costs in 2026 – Homeowner’s Guide

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In 2026, the cost of double glazing for UK homes continues to vary based on window style, frame material, glazing specification, and ease of access for installation. Double glazing can improve comfort and energy efficiency, and it may also boost resale appeal — but quotes can differ widely, so it’s worth comparing like-for-like.

With energy bills still a major concern for many households, homeowners are prioritising upgrades that reduce draughts and heat loss. This guide breaks down today’s typical fitted prices, what pushes costs up, and where you can often save without compromising on quality.

Frame Material and Its Impact on Double Glazing Costs

Frame material has one of the biggest impacts on price. In 2026, the figures below reflect typical fitted costs for a standard-size casement window (supply + installation), before premium upgrades such as coloured foils, flush sashes, heritage bars, upgraded glass, or tricky access.

uPVC

uPVC is usually the most affordable option and remains the most common choice for UK homes. For a standard uPVC casement window supplied and fitted, typical costs are around £350–£550 depending on size and spec.

Aluminium

Aluminium is typically more expensive than uPVC, but it’s popular for modern looks and larger openings thanks to slimmer, strong frames. Expect a standard aluminium casement window to cost around £600–£850 supplied and fitted.

Timber

Timber is a premium option (especially in period homes) and usually costs more due to materials and finishing. Typical fitted prices for a timber casement window are around £750–£1,100.

Composite

Composite frames are often priced above standard uPVC and can compete with timber on performance and looks. Costs vary widely by construction and finish, but many homeowners choose composite when they want premium aesthetics with minimal upkeep.

The table below shows typical fitted costs per casement window by frame material (standard size/spec).

Window Material	Typical Fitted Cost (Casement Window)
Window Material: uPVC	Typical Fitted Cost: £350 – £550
Window Material: Aluminium	Typical Fitted Cost: £600 – £850
Window Material: Timber	Typical Fitted Cost: £750 – £1,100
Typical fitted costs for a standard-size casement window (supply + installation). Premium options can increase totals.

Estimated Double Glazing Costs by Window Style

Window style matters because complexity and installation time can jump quickly (for example, sash and bay windows). The table below shows typical fitted costs for a standard-size replacement window (approx. 900mm x 1200mm), by style and material.

Window Style	uPVC (Fitted)	Aluminium (Fitted)	Timber (Fitted)
Window Style: Casement	uPVC: £350 – £550	Aluminium: £600 – £850	Timber: £750 – £1,100
Window Style: Tilt and turn	uPVC: £500 – £700	Aluminium: £750 – £1,000	Timber: £900 – £1,200
Window Style: Sash	uPVC: £700 – £1,100	Aluminium: £1,100 – £1,400	Timber: £1,500 – £2,000
Window Style: Bay (3-section)	uPVC: £1,500 – £2,500	Aluminium: £2,000 – £3,000	Timber: £2,500 – £3,500
Typical fitted costs for standard-size replacements. Larger sizes, premium finishes, and difficult access can increase totals.

Not sure which window style suits your home best? Take a look at our Window Style Guide to explore your options.

The Impact of Window Size on Double Glazing Costs

Larger windows usually cost more due to increased materials and extra labour. Big units can be heavier, may need additional installers on site, and sometimes require scaffolding or minor making-good around the opening. If you resize openings or change style, structural work can also add cost.

The table below shows typical fitted costs by size and material for standard casement windows:

Frame Material	Small (600mm x 900mm)	Medium (900mm x 1,200mm)	Large (1,200mm x 1,200mm)
Frame Material: White uPVC	Small: £300 – £450	Medium: £450 – £600	Large: £550 – £700
Frame Material: Aluminium	Small: £550 – £750	Medium: £700 – £900	Large: £800 – £1,100
Frame Material: Timber	Small: £850 – £1,100	Medium: £1,200 – £1,500	Large: £1,400 – £1,800
Typical fitted costs by material and size for standard casement windows.

How the Number of Windows Affects Double Glazing Costs

The total cost depends largely on how many windows you’re replacing. While more windows increases your overall bill, replacing multiple at once often reduces the per-window cost because the installer is already on site.

Many companies offer better pricing for full-home replacements — and comparing quotes helps you spot when one quote is high because of extras (scaffolding, tricky access, premium finishes, non-standard openings, or upgraded glazing).

Typical Double Glazing Costs for a Three-Bedroom Home by Property Type and Frame Material

As a rough guide in 2026, a full-home replacement can range from a few thousand pounds to significantly more depending on the number of windows, materials, and whether you have bays/sash windows or need scaffolding. For example, some installers quote around £3,000–£4,000 for fitting around 10 uPVC windows (supply + labour), while aluminium equivalents can be noticeably higher.

The table below uses typical fitted casement prices to show how totals can scale by property type:

Type of Property	Typical Number of Casement Windows	uPVC (Total)	Aluminium (Total)	Timber (Total)
Type of Property: Flat	Windows: 4	uPVC: £1,400 – £2,200	Aluminium: £2,400 – £3,400	Timber: £3,000 – £4,400
Type of Property: Terrace	Windows: 6	uPVC: £2,100 – £3,300	Aluminium: £3,600 – £5,100	Timber: £4,500 – £6,600
Type of Property: Semi-detached	Windows: 7	uPVC: £2,450 – £3,850	Aluminium: £4,200 – £5,950	Timber: £5,250 – £7,700
Type of Property: Detached	Windows: 15	uPVC: £5,250 – £8,250	Aluminium: £9,000 – £12,750	Timber: £11,250 – £16,500
Totals are indicative and assume typical casement replacements. Bays/sash windows, scaffolding, and upgrades will increase costs.

Average Costs for Full-Home Installation

Home Type	Estimated Cost Range (Typical uPVC, Fitted)
Home Type: 2-Bedroom House	Estimated Cost Range: £2,000 – £4,500
Home Type: 3-Bedroom House	Estimated Cost Range: £3,000 – £7,500
Home Type: 4-Bedroom House	Estimated Cost Range: £4,500 – £9,500
Full-home ranges vary widely by window count, access, and spec. Always compare like-for-like quotes.

Labour Costs for Installation

In 2026, installation is commonly priced per window rather than as an hourly rate. As a rule of thumb, installation can account for roughly 20%–40% of the overall price, with many installers charging around £200–£400 per window for fitting depending on size, access and complexity.

Labour Pricing	Typical Range
Labour Pricing: Installation per window	Typical Range: £200 – £400
Labour Pricing: Labour share of total quote	Typical Range: 20% – 40%
Difficult access (upper floors), bay windows, and scaffolding can increase labour costs.

Why uPVC is the go-to choice for UK homeowners

uPVC (unplasticized polyvinyl chloride) remains the most popular frame choice in the UK because it’s affordable, low maintenance, and thermally efficient. It suits both modern and traditional homes and is widely available from most installers.

Benefits of uPVC Double Glazing

• Cost-Effective: Usually the lowest fitted cost compared with timber, aluminium, or composite.
• Durable: Weather-resistant and rot-proof, ideal for UK conditions.
• Energy Efficient: Helps reduce heat loss and draughts.
• Low Maintenance: No repainting required; simple cleaning.
• Style Options: Foils/colours/flush finishes are available (often at extra cost).

Pros and Cons of uPVC

• Pros: Affordable, energy-saving, low maintenance, durable.
• Cons: Heritage aesthetics can be harder to match than timber; premium finishes can narrow the price gap.

Key Considerations for Double Glazing Costs

When planning your double glazing project, several factors influence the total cost beyond window size and style. Balancing these factors helps achieve the best value for your home:

• Frame Material: Options like uPVC, aluminium, and timber vary in price, durability, and look. uPVC is affordable and popular, aluminium offers a modern aesthetic, and timber is classic but pricier.
• Glass Type: Standard glass is energy-efficient at a lower cost, while Low-E glass has a higher upfront cost but excellent insulation properties.
• Location: Installation rates can vary significantly, with urban areas often costing more than rural regions.

Each choice impacts the final cost, so consider your preferences and budget carefully. By Comparing free quotes from multiple installers, you’ll gain a clearer view of pricing to help balance aesthetics, performance, and cost efficiency.

Try Our Double Glazing Costs Calculator

If you already know the type of windows you’d like to install, you can estimate the total cost of your new double glazing. Try our double glazing cost calculator to get an approximate price based on the number of windows you need.

Double Glazing Costs Calculator

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