How Much Do Storm Windows Cost?

Storm windows are an effective solution for UK homeowners seeking extra protection against harsh weather, adding a secondary layer of glazing over existing windows. Designed to reduce drafts, noise, and damage from wind, rain, or frost, they’re especially popular for older homes with single-pane windows. In 2025, with improved materials and designs, storm windows offer a cost-effective way to boost insulation without full replacements. This guide explores their costs, benefits, and key factors to consider for installation in the UK.

Storm windows often work quietly in the background—until a storm reveals their value or wear shows their limits. Estimating their cost involves variables like size, material, and whether they’re fixed or operable. Whether you’re safeguarding a historic property or cutting energy bills, understanding the pricing is crucial.

Typical Storm Window Costs by Size

The cost of storm windows depends on their size and type (fixed or operable). Below is a table showing typical dimensions and cost ranges in the UK for 2025 (including standard installation):

Width (mm)	Height (mm)	Type	Cost Range (Aluminium)	Cost Range (uPVC)
600	900	Fixed	£100-£200	£80-£150
900	1200	Fixed	£150-£250	£120-£200
1200	1500	Operable	£200-£350	£180-£300
1500	1800	Operable	£250-£400	£220-£350

In the UK, storm window costs typically range from £80 to £400 per window, depending on size, material, and functionality. They’re a lightweight, affordable layer of defence, but prolonged exposure to storms can wear seals or frames. If yours are loose or ineffective, replacement could restore protection.

Material Cost Comparison

Before adding storm windows, it’s smart to explore your options. What’s the installation cost, and which material suits your home? Your choice balances budget, durability, and ease of use. Here’s a table comparing materials for a standard 900mm x 1200mm fixed storm window:

Material	Cost Range	Pros	Cons
uPVC	£120-£200	Affordable, low maintenance	Less durable in extreme weather
Aluminium	£150-£250	Strong, lightweight, long-lasting	Slightly pricier, less insulating
Timber	£200-£300	Aesthetic appeal, decent insulation	Needs upkeep, less common

How much do storm windows really cost? Beyond size and material, features like operable sashes or Low-E coatings can raise the price. uPVC is the budget pick, aluminium excels in durability, and timber adds a classic touch—though it’s less practical for exterior exposure.

Factors Affecting Storm Window Costs

Considering repairs instead? A cracked pane or worn seal might not require a full replacement—repairs typically cost £50-£150, depending on damage. But if insulation or weatherproofing is failing, new storm windows could be the better fix. Here’s what drives their cost:

Factor	Description	Impact on Cost
Size	Matches existing window dimensions	Adds £50-£100 per size jump
Type	Fixed vs. operable	Operable adds £30-£80
Material	uPVC, aluminium, timber	See material table
Labour	£50-£150 per window	Higher for complex fits
Glass Upgrade	Low-E or tempered glass	£20-£50 extra

Repair or replace? If your storm windows still fit snugly and damage is minor, a repair might suffice. But if drafts or noise persist, replacement enhances protection and efficiency. A specialist can assess compatibility with your existing windows.

Additional Installation Costs

Choosing storm windows is about practicality and preservation. Want to shield old windows or cut drafts? uPVC keeps costs low, aluminium offers resilience, and timber suits heritage homes. Here’s a breakdown of extra costs:

Expense	Typical Cost	Notes
Removal of Old Storm Window	£20-£80	If replacing existing ones
Scaffolding	£150-£300	For upper floors
Custom Fitting	£50-£150	For irregular window shapes
Finishing (e.g., caulking)	£20-£50 per window	Sealing for weatherproofing

Materials shape cost and performance—uPVC is economical, aluminium withstands storms, and timber needs care. Glass upgrades like Low-E coatings add £20-£50, improving insulation. A typical installation might total £150-£600 with extras.

Return on Investment (ROI)

Storm windows improve comfort and protect existing windows—here’s how they pay off:

Benefit	Estimated Savings/Value	Timeframe
Energy Savings	£50-£150/year	Ongoing with draft reduction
Property Value Increase	1-2% of home value	Upon resale, preservation bonus
Payback Period	3-7 years	Based on savings and low cost

Final Thoughts

Storm window costs in 2025 range from £80 for a small uPVC unit to £400 for a large operable aluminium one. Size, material, and installation extras determine the price, but their weatherproofing, noise reduction, and energy savings make them a smart add-on. Secure three quotes from trusted installers to ensure quality and fit—storm windows offer affordable protection for UK homes.