How Much Do Sash Windows Cost?

Sash windows are a quintessential feature of UK homes, especially in period properties, offering a timeless elegance with their sliding sashes—typically two panes that move vertically. Known for their charm and improved modern functionality, they blend heritage aesthetics with practical ventilation. In 2025, with advanced glazing and material options, sash windows remain a popular choice. This guide explores their costs, benefits, and key factors to consider for installation or replacement in the UK.

Sash windows often enhance a home’s character unnoticed—until they rattle, stick, or let in the cold. Calculating their replacement cost can feel intricate due to variables like size, material, and labour. Whether you’re restoring a Victorian terrace or upgrading for efficiency, understanding the pricing is vital.

Typical Sash Window Costs by Size

The cost of sash windows varies by size and glazing type. 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 (Timber)
600	1200	Double	£350-£500	£600-£850
900	1500	Double	£450-£650	£750-£1,000
1200	1500	Double	£550-£800	£900-£1,200
1200	1800	Triple	£650-£950	£1,000-£1,400

In the UK, sash window costs typically range from £350 to £1,400 per window, depending on size, material, and glazing. Their intricate design often makes them pricier than simpler styles, and exposure to rain, wind, and frost can wear them out over decades. If yours are noisy or inefficient, replacement could restore both charm and comfort.

Material Cost Comparison

Before investing in sash windows, it’s wise to explore the details. What’s the installation cost, and which material suits your home’s style? Your choice depends on budget, authenticity, and maintenance preferences. Here’s a table comparing materials for a standard 900mm x 1500mm sash window:

Material	Cost Range	Pros	Cons
uPVC	£450-£650	Affordable, low maintenance	Less authentic look
Aluminium	£550-£800	Durable, slim frames, modern	Less traditional, less insulating
Timber	£750-£1,000	Heritage appeal, good insulation	Requires regular care

How much do sash windows really cost? Beyond size and material, extras like triple glazing or period-style detailing can increase the price. Timber is the gold standard for authenticity, uPVC offers a budget-friendly alternative, and aluminium bridges the gap with a modern twist.

Factors Affecting Sash Window Costs

Considering repairs instead? A loose sash cord or cracked pane might not require a full replacement—repairs typically range from £100-£300, depending on the issue. But if insulation is poor or sashes won’t budge, new windows might be the better investment. Here’s what drives sash window costs:

Factor	Description	Impact on Cost
Size	Larger windows use more materials	Adds £100-£250 per size jump
Glazing	Double vs. triple glazing	Triple glazing adds £50-£150
Material	uPVC, aluminium, timber	See material table
Labour	£150-£300 per window	Higher for complex installs
Sash Mechanism	Weights, pulleys, or springs	£50-£150 for upgrades

Repair or replace? If your sash windows function but look worn, a repair might preserve their charm. But if drafts, rattles, or energy loss are problems, replacement offers modern efficiency with classic style. A specialist can help you decide.

Additional Installation Costs

Choosing sash windows is about blending tradition with performance. Want authentic detailing or better insulation? Timber suits period homes, uPVC keeps costs down, and aluminium adds a contemporary flair. Here’s a breakdown of extra costs:

Expense	Typical Cost	Notes
Removal of Old Window	£50-£150	Depends on condition
Scaffolding	£200-£400	For upper floors
Building Regulations	£100-£150	FENSA certification
Finishing (e.g., trim)	£30-£70 per window	Optional period detailing

Materials affect cost and care—uPVC is low-maintenance, timber needs upkeep for its beauty, and aluminium offers durability. Glazing upgrades like triple panes or low-e coatings add £50-£150, boosting efficiency. A typical replacement might total £500-£1,600 per window with extras.

Return on Investment (ROI)

Sash windows enhance both aesthetics and value—here’s how they pay off:

Benefit	Estimated Savings/Value	Timeframe
Energy Savings	£75-£200/year	Ongoing with good glazing
Property Value Increase	2-4% of home value	Upon resale
Payback Period	10-15 years	Based on savings and value

Final Thoughts

Sash window costs in 2025 range from £350 for a small uPVC unit to £1,400 for a large timber one. Size, material, and installation extras shape the price, but their elegance, ventilation, and value make them a worthy investment. Secure three quotes from FENSA-registered installers to ensure quality and savings—sash windows bring classic style and modern efficiency to UK homes.