Guide to Buying Windows in the UK: Everything You Need to Know

Upgrading your home’s windows is one of the most effective ways to boost energy efficiency, improve kerb appeal, and enhance security. 

Whether you’re renovating an older property or fitting windows for a new build, knowing what to look for when buying new windows can save you money and hassle in the long run.

Why Buy New Windows?

Many UK homeowners delay replacing old windows until it’s unavoidable, but there are strong reasons to make the move sooner:

• Energy Efficiency: Modern double glazed windows significantly reduces heat loss, helping you save on energy bills.
• Improved Security: New windows come with advanced locking systems, offering better protection against break-ins.
• Reduced Noise: Enhanced glazing options can minimise external noise, ideal for urban areas.
• Aesthetic Appeal: Fresh window frames can transform the look of your home from dated to modern.
• Property Value: Buyers look for homes with quality windows.

Common signs it’s time to buy new windows

• Draughts or cold spots
• Rotting or damaged frames
• Condensation between glazing panes
• Stiff or broken handles and locks

Types of Windows to Buy in the UK

When looking at windows to buy, you’ll come across several popular styles. Each serves a different function and suits different aesthetics.

Casement Windows

The UK’s most common style, hinged at the side and opening outwards.

• Great for ventilation
• Low maintenance
• Works well with most house styles

Sash Windows

A traditional choice with vertical sliding panels.

• Ideal for period properties
• Adds character and charm
• Now available in modern uPVC for better insulation

Tilt and Turn Windows

Open in two directions, tilt inward at the top or swing fully open from the side.

• Easy cleaning
• Versatile for restricted spaces
• Offers excellent ventilation

Bay and Bow Windows

Project outward to create a sense of space and bring in light.

• Great for adding floor space and value
• Create a cosy nook or feature area

Fixed Windows

Do not open, but allow light into rooms.

• Ideal for hallways or staircases
• Often used alongside other window types

Window Frame Materials: Pros and Cons

When buying windows in the UK, your choice of frame material will affect cost, maintenance, and appearance.

uPVC

• Affordable and low maintenance
• Good thermal efficiency
• Available in a wide range of colours and finishes

Aluminium

• Strong and durable
• Slim sightlines for a modern look
• Slightly less insulating than uPVC but still energy-efficient with thermal breaks

Timber

• Naturally insulating and classic in appearance
• Suits heritage properties
• Requires regular maintenance (painting, sealing)

Composite

• Combines timber inside with aluminium or uPVC outside
• Excellent insulation and durability
• Higher cost but long-lasting performance
  

Key Features to Consider When Buying Windows

Before you buy windows, make sure you understand these important features:

• Energy Efficiency Ratings: Look for A-rated or better, such as the Liniar uPVC profile.
• U-Values: Lower U-values mean better thermal performance.
• Security Standards: Ensure compliance with PAS 24 and Secured by Design accreditation.
• Glazing Options: Choose between double or triple glazing, with optional coatings for solar control or noise reduction.
• Ventilation: Trickle vents and opening mechanisms matter, particularly in kitchens, bathrooms, or new builds.

Window Costs in the UK (2025 Update)

The price of buying new windows can vary widely based on style, size, and materials. Here’s a rough guide:

Window Type	uPVC (per unit)	Aluminium (per unit)	Timber (per unit)
Casement	£250–£500	£500–£750	£700–£1,000
Sash	£500–£1,000	£800–£1,200	£1,000–£1,500
Tilt & Turn	£350–£600	£600–£850	Rare
Bay/Bow	£1,200–£2,500+	£2,000–£3,000+	£2,500–£4,000+

Other factors that affect cost:

Beyond the base price of your chosen window style and material, several variables can influence the overall cost of buying windows. The type of glazing plays a major role; opting for triple glazing instead of double can increase both the material and installation price. Colour and finish are also key factors; custom colours or woodgrain effects may cost more than standard white uPVC. Installation fees vary based on the complexity of the job and location, especially if scaffolding or structural alterations are required. Finally, larger or uniquely shaped windows will typically command higher prices due to bespoke manufacturing requirements.

Choosing a Trusted Window Installer

A high-quality window is only as good as its installation. To make sure your new windows perform as intended, always hire a certified window installer. In the UK, reputable professionals are often registered with FENSA, CERTASS, or TrustMark. These accreditations mean the installer complies with building regulations and offers added consumer protection.

It’s a smart move to gather multiple quotes, not just to compare pricing but to evaluate the level of service and the quality of the proposed products. Don’t hesitate to ask for examples of recent work or customer references; professional installers will be happy to provide them.

You should also check what’s included in their guarantee. Most companies offer at least a 10-year warranty on frames and glazing, but it’s worth confirming what’s covered and for how long.

Mistakes to Avoid When Buying New Windows

• Focusing only on price: Cheap options can cost more in the long run through heat loss and poor durability.
• Ignoring regulations: Replacement windows must meet UK building regulations, especially around energy performance and ventilation.
• Skipping professional advice: Some homes may need specialist solutions (e.g. listed buildings or conservation areas).

Buy Trusted Windows from a Double Glazing Network Installer

Buying windows in the UK can feel daunting, but with the right information and a trusted installer, you can make a confident, informed decision that enhances your home for years to come. Whether you’re seeking classic sash windows or energy-efficient modern styles, there are high-quality windows to buy that meet every need and budget.Check out our range of energy-efficient windows and get started with the Double Glazing Network.