How Much Do Replacement Windows Cost?

Replacement windows are a popular home improvement choice, enhancing energy efficiency, security, and curb appeal. With advancements in window technology and materials, homeowners in 2025 can choose from a variety of styles and options to suit their needs. This guide breaks down the costs of replacing windows in the UK, including typical prices by window type, factors influencing cost, and additional expenses to consider.

Homeowners often take windows almost for granted – until they break, or get old, and need to be replaced. Figuring out window replacement costs is an involved process as there are many factors that can ultimately influence the overall cost. There are some obvious factors to consider such as the type, size, quality, and the number of windows you want to be replaced.

Typical Replacement Window Costs by Type

The cost of replacement windows depends on the style, material, and size you choose. Below is a table outlining the most popular window types, their average sizes, and cost ranges in the UK as of 2025 (prices include installation):

Window Type	Average Size (mm)	Material Options	Cost Range (per window)
Casement Windows	600 x 900	uPVC, Timber, Aluminium	£250-£600
Sash Windows	700 x 1200	uPVC, Timber	£400-£900
Double Hung Windows	600 x 1200	uPVC, Timber	£350-£750
Bay Windows	2400 x 1200	uPVC, Timber, Aluminium	£1,200-£2,500
uPVC Double Glazed	600 x 900	uPVC	£200-£450

In the U.K. the average price range for replacement windows is between £400 – £1500 pounds per window plus labor cost. If you’re a homeowner, window replacement will likely creep up on you at some point. Several things can wreak havoc on your windows: extreme temperatures, heavy winds, hail, and rain and more. It happens over time, so unless there are visual markings of a need to replace your windows, you might overlook it.

Material Cost Comparison

Before you go out and buy new windows, it’s essential to gather a bit of information. What does the replacement window contractor cost anyway? Do you need a particular type of window, and who can help? Let’s discuss some of the questions you might ask when seeking replacement windows so you can feel confident to make a decision. The material you choose significantly affects the price. Here’s a table comparing the cost per window for different materials:

Material	Cost Range (600 x 900mm)	Pros	Cons
uPVC	£250-£400	Affordable, low maintenance	Limited colour options
Timber	£850-£1,000	Aesthetic appeal, natural insulation	Requires regular maintenance
Aluminium	£550-£700	Durable, modern look	Higher cost, less insulating

How Much Do Window Replacements Cost? This table shows the average cost per double-glazed window. Much of this difference will be based on the type of window, location, brand, labor, and more.

Window Frame	600 x 900mm	900 x 1200mm	1200 x 1200mm
uPVC	£250-£400	£400-£600	£650-£900
Aluminium	£550-£700	£650-£800	£750-£1,000
Timber	£850-£1,000	£1,200-£1,400	£1,350-£1,500

Higher quality windows (wood windows, or high-performance glass, for example), have a more significant cost estimate ranging from £850 – £1250 per window. Other factors that play into cost could be: windows that are energy efficient, type of frames (the most popular frame choices are wood, vinyl, aluminum, and fiberglass), types of windows (homeowners typically choose double-hung windows, picture windows, bay windows—on the costly side—and casement windows), the number of windows you need (some homes only need a few, while others need many more—each window has an individual cost, and all of them together will create your total cost), warranty costs, and labor and installation costs (for many companies, this is per window/per hour, but each company will have its set costs). As you can see, replacing your windows is a significant financial investment. When you’re considering replacement windows, compare replacement window contractor cost using the above elements, so you can come to a conclusion that works for you.

Factors Affecting Replacement Window Costs

How Much Does It Cost to Repair Home Windows? Watching a baseball fly through your window and shattering the glass doesn’t mean an entire window replacement is in your future. It’s entirely possible that a simple repair is needed only. Repairing a window is similar in cost to replacement windows. However, it depends on the extent of the damage. In general, the average window repair hovers around £200 – £500. If a warranty covers your window, the company may repair the window for free.

Factor	Description	Impact on Cost
Window Size	Larger windows require more materials and labour	Increases cost
Glazing Type	Double vs. triple glazing	Triple glazing adds £50-£150 per window
Frame Material	uPVC, timber, or aluminium	Varies by material (see above)
Labour Rates	Typically £100-£150 per window	Higher in urban areas
Location	Regional price differences	London/South East 10-20% higher

Much thought should go into deciding whether or not to replace or repair. Some things to consider are: overall cost (usually, repairs are less expensive than replacements but can be more costly, especially if the window is high-end or custom made), if the window still works well and there are no other damages, then a repair might be okay, and are your energy costs creeping upward? It could be time to invest in more energy-efficient windows. The decision to repair or replace isn’t always cut and dry, but finding a dedicated and knowledgeable professional can assist you in making the best decision.

Additional Installation Costs

Window Types To Consider: Deciding that you are going to opt for window replacement is the easy part. Picking the right window type can be an impulsive decision, but you’re always better off consulting with local professionals. Nevertheless, here’s a quick and easy guide to help you choose the best windows for your particular home and unique requirements:

• Best value for money: Single-hung windows (affordable, fewer moving parts), double-hung windows (common, great ventilation and value), casement windows (energy-efficient, unobstructed views).
• Aesthetic appeal: Picture windows (unhindered views, modern look), bay windows (attractive, practical, high ROI).

Beyond the windows themselves, additional expenses may arise. Here’s a breakdown:

Expense	Typical Cost	Notes
Removal of Old Windows	£50-£100 per window	Included in some quotes
Scaffolding	£200-£500	For upper floors or large projects
Building Regulations	£100-£200	FENSA certification required
Window Trims/Finishing	£20-£50 per window	Optional aesthetic upgrade

Replacement Window Materials: Once you have decided on window types, you also need to consider what materials you want your windows made from. There are advantages to all the materials and it’s a matter of considering your wishes, style, and budget when selecting. Let’s take a closer look at the window material choices: Aluminum windows (durable, low maintenance), vinyl windows (low cost, minimal upkeep), fiberglass windows (flexible design, no maintenance), wood windows (classic look, higher maintenance). The other consideration is the glass package: dual/triple pane glass, argon gas, krypton gas, or low-e glazing, which affect energy efficiency and cost.

Return on Investment (ROI)

Replacement windows offer energy savings and increased property value. Here’s how they pay off:

Benefit	Estimated Savings/Value	Timeframe
Energy Savings	£100-£300/year	Ongoing
Property Value Increase	2-5% of home value	Upon resale
Payback Period	10-15 years	Based on energy savings

Final Thoughts

Replacement window costs in 2025 range from £200 for a small uPVC window to £2,500 for a large bay window, with most UK homes spending £2,000-£6,000 for a full replacement. Factors like material, glazing, and labour influence the price, but energy savings and increased home value justify the expense. Get at least three quotes from FENSA-registered installers to ensure quality and value—upgrading your windows has never been more rewarding.