How Much Do Garden Windows Cost?

Garden windows are a charming addition to UK homes, extending outward like a mini greenhouse to create a three-dimensional space for plants, decor, or extra light. Featuring a box-like design with glass on the top, sides, and front, they’re perfect for kitchens or living areas. In 2025, with modern glazing and material advancements, garden windows offer both aesthetic appeal and functionality. This guide explores their costs, benefits, and key factors to consider for installation or replacement in the UK.

Garden windows often brighten a room unnoticed—until they leak, fog up, or lose their appeal. Estimating their cost can feel tricky due to their unique structure and custom installation needs. Whether you’re enhancing a kitchen or creating a plant nook, understanding the pricing is key.

Typical Garden Window Costs by Size

The cost of garden 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)	Depth (mm)	Cost Range (uPVC)	Cost Range (Aluminium)
900	900	400	£600-£900	£750-£1,100
1200	1200	450	£800-£1,200	£950-£1,400
1500	1200	500	£1,000-£1,500	£1,200-£1,800
1800	1500	600	£1,300-£1,900	£1,500-£2,200

In the UK, garden window costs typically range from £600 to £2,200, depending on size, material, and glazing (double glazing assumed unless specified). Their protruding design adds complexity, and exposure to weather—rain, wind, or frost—can wear them down. If yours are leaking or lack ventilation, replacement could refresh their charm.

Material Cost Comparison

Before choosing garden windows, it’s worth digging into the details. What’s the installation cost, and which material suits your vision? Your decision balances budget, durability, and style. Here’s a table comparing materials for a standard 1200mm x 1200mm x 450mm garden window:

Material	Cost Range	Pros	Cons
uPVC	£800-£1,200	Affordable, low maintenance	Simpler aesthetic
Aluminium	£950-£1,400	Strong, slim frames, modern	Less insulating, pricier
Timber	£1,200-£1,700	Warm look, good insulation	Requires upkeep

How much do garden windows really cost? Beyond size and material, extras like triple glazing, operable side vents, or built-in shelves can bump up the price. uPVC is the practical choice, aluminium offers a sleek finish, and timber brings a cozy, natural vibe.

Factors Affecting Garden Window Costs

Considering repairs instead? A cracked pane or faulty seal might not demand a full replacement—repairs typically cost £100-£300, depending on the issue. But if insulation or structure is compromised, a new window might be the better bet. Here’s what influences garden window costs:

Factor	Description	Impact on Cost
Size	Larger units need more materials	Adds £200-£400 per size jump
Glazing	Double vs. triple glazing	Triple glazing adds £100-£200
Material	uPVC, aluminium, timber	See material table
Labour	£200-£400 per window	Higher for structural work
Ventilation	Operable side or top vents	£50-£150 extra

Repair or replace? If your garden window still holds shape and damage is minor, a repair could save money. But if leaks, poor insulation, or wear are issues, replacement offers better longevity and appeal. A pro can assess what’s best.

Additional Installation Costs

Choosing garden windows is about style and utility. Want a plant haven or extra light? uPVC keeps it simple, aluminium adds a modern edge, and timber enhances warmth. Here’s a breakdown of extra costs:

Expense	Typical Cost	Notes
Removal of Old Window	£50-£150	Varies by condition
Structural Support	£200-£500	For protrusion reinforcement
Building Regulations	£100-£200	FENSA certification
Finishing (e.g., trim)	£50-£150	Interior/exterior work

Materials impact cost and care—uPVC is low-maintenance, aluminium offers strength, and timber needs upkeep for its charm. Glazing upgrades like triple panes or low-e coatings add £100-£200, boosting efficiency. A typical installation might total £900-£2,500 with extras.

Return on Investment (ROI)

Garden windows enhance aesthetics and utility—here’s how they pay off:

Benefit	Estimated Savings/Value	Timeframe
Energy Savings	£50-£150/year	Ongoing with good glazing
Property Value Increase	1-3% of home value	Upon resale
Payback Period	12-18 years	Based on savings and value

Final Thoughts

Garden window costs in 2025 range from £600 for a small uPVC unit to £2,200 for a large aluminium or timber one. Size, material, and installation extras determine the price, but their charm, light, and plant-friendly design make them a delightful upgrade. Secure three quotes from FENSA-registered installers to ensure quality and value—garden windows bring a touch of nature indoors for UK homes.