How much double glazing door cost?

The cost of a double glazed door in the UK typically ranges from £600 to £2,500 fully installed, depending on the door type, material, and size. The Energy Saving Trust states that replacing single-glazed doors with double glazing can save a typical semi-detached home around £110 per year on heating bills (Energy Saving Trust, 2026).

The final price is driven by the door material, glazing specification, and whether it is a standard or bespoke size. A basic uPVC door with standard double glazing is the cheapest option, while aluminium or timber doors with low-E glass or argon filling cost more. Labour and disposal of the old door add £100–£300 to the total. Prices also vary by region, with London and the South East typically 10–20% higher than the national average.

uPVC double glazed doors cost £600 to £1,200

uPVC is the most common and affordable material for double glazed doors. A standard 900mm-wide white uPVC door with a factory-fitted double glazed unit costs between £600 and £1,200 installed. The Glass and Glazing Federation notes that uPVC doors typically achieve a U-value of 1.4–1.6 W/m²K, meeting current Building Regulations for replacement doors (gov.uk, 2026). Adding a decorative glass pattern or a composite frame raises the cost by £100–£300. For a standard-size door, supply-and-fit quotes from multiple TrustMark-registered installers are advisable.

Composite double glazed doors cost £1,200 to £2,000

Composite doors combine a timber core with a GRP skin, offering better insulation and security than uPVC. A typical composite door with double glazing costs £1,200 to £2,000 installed. The Energy Saving Trust says composite doors can achieve a U-value as low as 1.0 W/m²K, significantly reducing heat loss (Energy Saving Trust, 2026). They are heavier and require a reinforced frame, adding to installation cost. Bespoke sizes or coloured finishes add £200–£500. The Great British Insulation Scheme closed on 31 March 2026. It funded insulation measures only and never covered windows or glazing.

Aluminium double glazed doors cost £1,500 to £2,500

Aluminium doors are the most expensive option, costing £1,500 to £2,500 installed. They are strong, slim-framed, and often used in modern or large-format doors. Aluminium frames with thermal breaks achieve U-values of 1.2–1.4 W/m²K, compliant with Part L of the Building Regulations (BRE, 2026). The cost includes a powder-coated finish and high-performance double glazing. French doors or sliding patio doors in aluminium cost £2,000–£4,000. The MCS certification is not required for doors unless they are part of a renewable energy system, but all installations should comply with FENSA or equivalent building control.

A worked example

Glazing is standard-rated for VAT at 20%. The zero rate for energy-saving materials covers insulation, heat pumps and solar panels; HMRC names secondary and double glazing as excluded (VAT Notice 708/6). The Energy Saving Trust estimates this saves roughly £110 per year on heating bills for a semi-detached property. If the household qualifies for the ECO4 scheme, the door could be fully funded, bringing the upfront cost to zero. For a household paying the full price, the payback period is just over eight years, and with double glazing lasting 20–25 years, the total lifetime savings reach approximately £2,750. Using an argon-filled unit with a low-E coating improves the U-value to around 1.2 W/m²K, which can save an extra £15–£20 per year. Always check with a MCS-certified installer to ensure the work meets Building Regulations.

What homeowners often get wrong

The most common mistake is assuming all double glazed doors are the same and buying the cheapest option without checking the energy performance rating. This leads to three specific errors that cost money and miss out on savings.

1. Ignoring the U-value rating Many buyers focus only on the frame material and price, but a door with a U-value above 1.6 W/m²K loses heat much faster. Choosing a door rated at 1.2 W/m²K or lower saves £20–£30 extra per year compared to a basic model, adding up to £500–£750 over the door’s lifetime.
2. Glazing is standard-rated for VAT at 20%. The zero rate for energy-saving materials covers insulation, heat pumps and solar panels; HMRC names secondary and double glazing as excluded (VAT Notice 708/6). This means paying an extra 20% on a £1,200 door, a wasted £200 that is legally yours to keep until March 2027 under HMRC rules.
3. Skipping the ECO4 eligibility check Many assume grants are only for insulation or boilers, but the ECO4 scheme can fully fund a replacement double glazed door for low-income households. Failing to check with your energy supplier could mean missing a £1,500 grant that covers both supply and installation.

Quick reference

• A standard uPVC double glazed door costs £600 to £1,200 installed, while composite doors range from £1,200 to £2,000.
• The Energy Saving Trust estimates a typical semi-detached home saves £110 per year on heating by replacing a single-glazed door with double glazing.
• ECO4 eligibility requires a household to receive certain benefits or have a low income, and the scheme can fully fund the door replacement through your energy supplier.
• Payback on a £900 door at £110 annual savings is just over eight years, with total savings of £2,750 over 25 years.
• Always request a U-value below 1.6 W/m²K for your new door to meet Building Regulations and maximise heat retention.