Double & Triple Glazing — Keep the Heat In and the Cold Out

Windows are one of the biggest weak points in your home's thermal envelope. Modern double and triple glazing dramatically reduces heat loss, draughts, and outside noise.

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£235

Potential annual savings

Typical cost: £3,000 – £8,000

Single-glazed windows lose heat up to three times faster than double-glazed equivalents, and even older double glazing installed before 2002 performs significantly worse than modern units. With gas at 6.76p/kWh and electricity at 24.67p/kWh, the heat escaping through inefficient windows is costing UK households hundreds of pounds every year. Upgrading to modern A-rated double or triple glazing can cut window heat loss by up to 75%, improving comfort and reducing reliance on expensive heating.

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Potential annual saving

£0k

Typical installation cost

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Average payback period

Window heat loss reduction

What Is Glazing?

Double glazing consists of two panes of glass separated by a sealed gap filled with argon or krypton gas, which acts as an insulating layer. Triple glazing adds a third pane and a second gas-filled cavity for even greater thermal performance. Modern units feature low-emissivity (low-E) coatings that reflect heat back into the room and warm-edge spacer bars that reduce heat loss at the edges of the glass unit.

How It Works

Survey and Quote

A glazing specialist measures all windows, discusses frame materials (uPVC, timber, aluminium) and glass specifications, and provides a detailed quotation.

Manufacturing

Your new windows are manufactured to exact measurements. Lead times are typically two to four weeks depending on the manufacturer and specification.

Installation

Old windows are carefully removed, new units are fitted and sealed, and frames are finished with trim. A typical home can be completed in one to two days.

Quality Check

All windows are checked for correct operation, air tightness, and clean finishing. FENSA or CERTASS certification is registered with your local authority.

Is It Right for My Home?

Double and triple glazing is suitable for virtually all property types. Most installations are classed as permitted development and do not require planning permission, though listed buildings and properties in conservation areas may face restrictions on window styles and materials. Homes with existing single glazing will see the greatest improvement, but upgrading older double glazing (pre-2002) to modern A-rated units also delivers worthwhile savings.

Key Benefits

Lower Energy Bills

Save up to £235 per year by reducing heat loss through your windows, keeping your home warmer with less heating.

Eliminate Draughts

Modern sealed units and frames eliminate the cold draughts associated with single glazing and poorly fitting older windows.

Reduce Condensation

Warmer inner pane surfaces significantly reduce or eliminate the condensation that forms on cold single-glazed windows.

Noise Reduction

Double and triple glazing dramatically reduces external noise, creating a quieter and more peaceful living environment.

Improved Security

Modern double and triple glazed units are significantly harder to break than single glazing, with multi-point locking mechanisms enhancing home security.

Boost Property Value

New windows improve kerb appeal and EPC rating, adding to your home's market value and attractiveness to buyers.

Cost Breakdown

Our partner network means you'll typically pay less than these averages.

Property Type	Typical Cost	Annual Saving	Payback
Detached (12–15 windows)	£6,000 – £8,000	£235	15–20 years
Semi-Detached (8–10 windows)	£4,000 – £6,000	£165	15–20 years
Terraced (6–8 windows)	£3,000 – £4,500	£120	15–20 years
Bungalow (6–10 windows)	£3,500 – £5,500	£145	15–20 years

Government Grants Available

ECO4

Replacement glazing may be funded under ECO4 for eligible low-income households, typically as part of a broader package of energy efficiency measures.

Check Eligibility →

Warm Homes Plan

The Warm Homes Plan may provide support for window upgrades in fuel-poor households where glazing is identified as a priority measure.