How Much Do Casement Windows Cost?

Casement windows are a popular choice for UK homeowners, prized for their simplicity, versatility, and excellent ventilation. Hinged on one side and opening outward like a door, they offer unobstructed views and a classic yet adaptable design. In 2025, with advancements in glazing and frame materials, casement windows remain a practical and stylish option. This guide explores their costs, benefits, and key factors to consider for installation or replacement in the UK.

Casement windows often blend seamlessly into daily life—until they stick, fade, or fail to keep out the cold. Determining their replacement cost involves navigating a range of variables, from size and material to labour charges. Whether you’re refreshing a single room or your entire home, understanding the price details is essential.

Typical Casement Window Costs by Size

The cost of casement windows varies by size and glazing options. Below is a table showing typical dimensions and cost ranges in the UK for 2025 (including standard installation):

Width (mm)	Height (mm)	Glazing	Cost Range (uPVC)	Cost Range (Aluminium)
600	900	Double	£250-£400	£350-£500
900	1200	Double	£350-£550	£450-£650
1200	1200	Double	£450-£700	£550-£800
1200	1500	Triple	£550-£850	£650-£950

In the UK, casement window costs typically range from £250 to £950 per window, depending on size, material, and glazing. These windows are durable but face wear from wind, rain, and temperature shifts over time. If yours are hard to open or letting in drafts, it might be time to consider replacement.

Material Cost Comparison

Before buying casement windows, it’s smart to dig into the details. What’s the installation cost, and which material suits your needs? Your decision hinges on budget, maintenance preferences, and style. Here’s a table comparing materials for a standard 900mm x 1200mm casement window:

Material	Cost Range	Pros	Cons
uPVC	£350-£550	Affordable, minimal upkeep	Basic aesthetic
Aluminium	£450-£650	Slim frames, durable, modern	Less insulating, pricier
Timber	£600-£900	Elegant, naturally insulating	Needs regular maintenance

How much do casement windows really cost? Beyond size and material, extras like triple glazing or custom finishes can bump up the price. uPVC is the go-to for cost-conscious buyers, while timber appeals to those seeking a traditional look. Aluminium strikes a balance for modern homes.

Factors Affecting Casement Window Costs

Thinking about repairs instead? A jammed hinge or cracked glass might not mean a full replacement—repairs typically range from £80-£250, depending on the issue. But if insulation or operation is compromised, new windows might be the better bet. Here’s what drives casement window costs:

Factor	Description	Impact on Cost
Size	Larger windows need more materials	Increases £100-£200 per size jump
Glazing	Double vs. triple glazing	Triple glazing adds £50-£150
Material	uPVC, aluminium, timber	See material table
Labour	£100-£200 per window	Higher in cities like London
Hardware	Locks, handles, hinges	£20-£100 for upgrades

Repair or replace? If your casement window opens fine and damage is minor, a repair could save money. But if energy bills are climbing or the frame is rotting, replacement offers long-term value. A trusted installer can guide you through the choice.

Additional Installation Costs

Picking casement windows is straightforward, but details matter. Do you want easy-clean hinges or a bold frame colour? uPVC suits practicality, timber enhances heritage homes, and aluminium fits sleek designs. Here’s a breakdown of extra costs:

Expense	Typical Cost	Notes
Removal of Old Window	£50-£150	Varies by condition
Scaffolding	£200-£400	For upper floors
Building Regulations	£100-£150	FENSA certification
Finishing (e.g., trim)	£20-£50 per window	Optional aesthetic work

Material choice shapes both cost and care—uPVC needs little attention, timber requires upkeep for its charm, and aluminium offers durability. Glazing upgrades like triple panes or low-e coatings add £50-£150, boosting efficiency. A typical replacement might total £400-£1,000 per window with extras.

Return on Investment (ROI)

Casement windows deliver practical and financial benefits—here’s how:

Benefit	Estimated Savings/Value	Timeframe
Energy Savings	£50-£200/year	Ongoing with good glazing
Property Value Increase	1-3% of home value	Upon resale
Payback Period	10-15 years	Based on savings and value

Final Thoughts

Casement window costs in 2025 range from £250 for a small uPVC unit to £950 for a large timber or aluminium one. Size, material, and installation extras determine the price, but their ventilation, views, and value make them a solid choice. Get three quotes from FENSA-registered installers to ensure quality and savings—casement windows bring timeless appeal to any UK home.