Factors Affecting Window Costs
Window Size, Style, and Material
The cost of window replacement primarily depends on the size, style, and material of the windows. Different materials have varying price points and characteristics:
uPVC Windows Costs
uPVC (unplasticized polyvinyl chloride) frames are generally the most cost-effective option. They are known for their thermal efficiency, low maintenance, and durability. The price of uPVC windows varies based on size:
- 600 x 900mm: £250-£400
- 900 x 1200mm: £400-£600
- 1200 x 1200mm: £650-£900
Aluminum Windows Costs
Aluminum frames are more expensive than uPVC but offer increased durability and a sleek appearance. They are also more thermally efficient with modern thermal break technology:
- 600 x 900mm: £550-£700
- 900 x 1200mm: £650-£800
- 1200 x 1200mm: £750-£1,000
Timber Windows Costs
Timber frames are the most costly option, known for their classic and elegant finish. They add significant value to your home, especially for period properties:
- 600 x 900mm: £850-£1,000
- 900 x 1200mm: £1,200-£1,400
- 1200 x 1200mm: £1,350-£1,500
The choice of window style can also influence the cost. Different window styles come with varying price tags, and here are some popular styles and their average costs:
Casement Windows Costs
These versatile windows can be fixed or open in various ways. The cost depends on the size and number of openers:
- 600 x 900mm (Fixed): £150-£200
- 900 x 1200mm (1 Opener): £250-£400
- 1200 x 1200mm (French): £450-£500
Sash Windows Costs
Commonly found in period homes, these windows have distinctive features and higher costs:
- 600 x 900mm: £550-£650
- 900 x 1200mm: £675-£825
- 1200 x 1200mm: £850-£1,100
Tilt & Turn Windows Costs
These modern windows open inwards and offer flexibility. They are relatively affordable:
- 600 x 900mm: £350-£500
- 900 x 1200mm: £550-£750
- 1200 x 1200mm: £800-£1,050
Bay Windows Costs
These windows protrude outward, creating a bay area. Bay window costs vary based on the number of sections and size:
- 2400 x 1200 (3 section): £1,590-£1,725
- 3000 x 1200 (4 section): £1,775-£1,875
- 3600 x 1200 (5 section): £2,200-£2,500
Bow Windows Costs
Bow windows are rounded and allow more light into your home. They are generally more expensive than bay windows due to their curved design:
- 2400 x 1200 (3 section): £1,800-£1,950
- 3000 x 1200 (4 section): £1,975-£2,175
- 3600 x 1200 (5 section): £2,400-£2,600
Installation Costs
Installation costs are a significant portion of the total window replacement expenses. On average, the installation cost for a single window is around £300.
However, this cost may increase if you are replacing multiple windows or if your project involves complex installation scenarios, such as windows on upper floors, which may require scaffolding.
The Company You Choose
The choice of the window installation company can significantly impact the total cost. Prices can vary based on the company’s size and location relative to your home. It’s advisable to obtain quotes from multiple reputable companies to compare offers and select the one that provides the best value for your money.
Cost of Window Glazing
Additional costs may arise from specialized glazing options, such as low-emissivity (low-E), self-cleaning, or toughened glass, which can enhance energy efficiency and security. Extra security features, such as advanced locking mechanisms, can also contribute to the overall cost.
Double Glazing vs. Secondary Glazing Cost
Double glazing is a highly effective option for improving energy efficiency and reducing noise in your home. While the average cost of double glazing per window ranges from £350 to £600, it offers significant long-term savings on energy bills. The Energy Saving Trust estimates that installing A+ rated double glazing in gas-heated homes can save up to £195 per year.
If double glazing is not a viable option due to budget constraints or because your property is protected, secondary glazing is an alternative. Secondary glazing involves adding a second pane of glass to existing single glazing, improving insulation and reducing noise. However, it is not as effective as double glazing in terms of thermal performance.