New Construction Windows: Costs, Options, and Benefits

New construction windows are a cornerstone of building or renovating a UK home, offering a blend of energy efficiency, aesthetic appeal, and structural integrity. Designed for installation in new builds or major renovations, these windows are fitted directly into the wall framework, ensuring a seamless integration. In 2025, with advancements in glazing and materials, new construction windows are a top choice for homeowners and builders aiming for durability and style. This guide covers costs, material options, and key considerations for selecting new construction windows in the UK.

Unlike replacement windows, new construction windows are installed during the building process or when walls are exposed, allowing for precise fitting and optimal insulation. With energy costs rising, choosing the right windows can significantly impact your home’s comfort and value. Here’s everything you need to know to make an informed decision.

What Are New Construction Windows?

New construction windows are designed for installation in homes under construction or during major renovations where the wall structure is accessible. They feature a nailing flange that secures the window to the building’s frame, ensuring a weather-tight seal. These windows differ from replacement windows, which fit into existing frames. Here’s a quick comparison:

Type	Installation	Best For
New Construction	Nailed to wall frame	New builds, major renovations
Replacement	Fits existing frame	Upgrading existing windows

Typical Costs of New Construction Windows

The cost of new construction windows varies based on size, material, and glazing. Below is a table of typical costs for a standard 1200mm x 1200mm window in the UK for 2025, including installation:

Material	Cost Range	Pros	Cons
uPVC	£400-£800	Affordable, low maintenance	Less premium aesthetic
Aluminium	£600-£1,000	Sleek, durable, slim frames	Higher cost, less insulation
Timber	£800-£1,400	Classic look, good insulation	Requires regular maintenance

Costs for new construction windows typically range from £400 to £1,400 per window, depending on material and specifications. Larger or custom windows, such as bay or picture windows, can cost £1,500-£4,000 each.

Factors Affecting New Construction Window Costs

Several factors influence the cost of new construction windows. Understanding these helps you budget effectively:

Factor	Description	Impact on Cost
Size	Larger windows or custom shapes	Adds £200-£1,000 per window
Glazing	Double or triple glazing	Adds £100-£300 per window
Material	uPVC, aluminium, timber	See cost table
Installation	Labour and structural work	£150-£400 per window
Special Features	Low-e coatings, argon gas	£50-£200 per window

Custom designs or windows for listed buildings may require additional approvals, adding £100-£200 for compliance with UK regulations like FENSA certification.

Types of New Construction Windows

New construction windows come in various styles to suit different architectural needs. Here are the most popular types:

Window Type	Description	Cost Range (1200mm x 1200mm)
Casement	Hinged, swings outward	£400-£1,000
Sash	Slides vertically, classic look	£600-£1,200
Bay	Projects outward, multiple panels	£1,200-£3,000
Fixed/Picture	Non-opening, large glass area	£500-£1,000

Your choice depends on the home’s design and function. Casement windows are versatile, while sash windows suit period properties. Bay windows add space and light but are pricier.

Additional Installation Costs

Beyond the window itself, installation involves several costs that vary by project scope:

Expense	Typical Cost	Notes
Structural Work	£200-£600	Lintel or framing adjustments
Finishing	£100-£300	Plastering, exterior sealing
Building Regulations	£100-£200	FENSA or similar certification

Installation costs are higher in urban areas like London due to labour rates. Always use FENSA-registered installers to ensure compliance and quality.

Return on Investment (ROI)

New construction windows offer long-term benefits that enhance your home’s value and efficiency:

Benefit	Estimated Savings/Value	Timeframe
Energy Savings	£100-£300/year	Ongoing with efficient glazing
Property Value Increase	3-7% of home value	Upon resale
Payback Period	7-12 years	Based on savings and value

Final Thoughts

New construction windows are a critical investment for UK homes, with costs ranging from £400 for a small uPVC window to £4,000 for large or custom designs. Material choice, glazing, and installation complexity shape the price, but the benefits—energy savings, increased property value, and enhanced aesthetics—make them worthwhile. For the best results, obtain three quotes from FENSA-registered installers and prioritize energy-efficient options to future-proof your home.