The single most important thing to know about double glazing cost in the UK in 2026
If you are researching replacement windows, the headline figure you need is this: the average total cost for a standard 10-window house in the UK in 2026 is between £3,500 and £5,500, including supply and installation. This range is based on industry averages from the Glass and Glazing Federation (GGF) and the Energy Saving Trust (EST) for 2026 (GGF, 2026; Energy Saving Trust, 2026).
The final price depends primarily on three variables: window style (casement, sash, tilt-and-turn), frame material (uPVC, aluminium, timber), and the number of opening sections. A fixed pane costs less than an opening casement of the same size. The Great British Insulation Scheme closed on 31 March 2026. It funded insulation measures only and never covered windows or glazing.
How double glazing cost in the UK in 2026 breaks down by frame material
Frame material is the largest single cost driver per window. uPVC frames are the cheapest option, averaging £150–£350 per window (supply and install) in 2026, per GGF trade data (GGF, 2026). This material accounts for roughly 80% of new installations in the UK because of its low cost, durability, and good thermal performance.
Aluminium frames cost £350–£600 per window, while timber frames range from £450–£800 per window, according to the GGF. Composite frames (wood outer, aluminium inner) cost £500–£900 per window. All prices are for a standard casement window measuring approximately 900 mm x 1200 mm. Aluminium and timber options typically offer slimmer sightlines and a longer lifespan, but the upfront premium is significant. If you are on a tight budget, uPVC remains the most cost-effective choice; if you prioritise aesthetics or longevity, aluminium or timber may justify the higher outlay.
Quick numbers average double glazing cost in the UK in 2026 by house size
| House type | Average number of windows | Estimated total cost (supply & install) | Typical frame material for that price |
|---|---|---|---|
| 1-bed flat | 4–6 | £1,200–£2,400 | uPVC |
| 3-bed semi-detached | 8–12 | £3,500–£5,500 | uPVC or aluminium |
| 4-bed detached | 12–16 | £5,500–£9,000 | Aluminium or timber |
Figures sourced from the Energy Saving Trust 2026 cost guide and the GGF 2026 market report (Energy Saving Trust, 2026; GGF, 2026). These totals assume standard casement windows with no structural work, scaffolding, or heritage requirements.
Who qualifies for free or subsidised double glazing in the UK in 2026
Only households receiving specific means-tested benefits (e.g., Pension Credit, Income Support, Universal Credit) and with an Energy Performance Certificate (EPC) rating of E, F, or G may qualify for free double glazing under ECO4. The grant is administered by energy suppliers; eligibility is verified by the supplier’s partner scheme. Homeowners must apply through their energy supplier (GOV.UK, 2026).
The grant covers the full cost of replacement double glazing for eligible homes, but only if the existing glazing is single-glazed and the property has no other cost-effective insulation measure already installed. Homeowners with an EPC rating of D or above, or those not on qualifying benefits, do not qualify for any government grant for double glazing in 2026. The ECO4 scheme is the only government programme that covers window replacement; no other grant or subsidy is available for general double glazing installation (Ofgem, 2026).
The direct answer what is the average cost of double glazing per window in the UK in 2026
The average cost of a single double-glazed window (supply and installed) in the UK in 2026 is £200–£800, with the most common price being £300–£400 for a standard uPVC casement window. This figure is the median from the GGF 2026 price database and the EST’s 2026 home improvement cost table (GGF, 2026; Energy Saving Trust, 2026).
Cost varies by region: London and the South East are 10–20% higher than the national average; Scotland and Wales are 5–10% lower, according to the GGF. The price includes the frame, glass unit, and installation; it does not include any structural work, scaffolding, or repairs. If you need a non-standard size or a heritage-style window, expect the per-unit cost to rise sharply, often to £600–£1,200.
How to verify an installer and ensure your double glazing is eligible for any grant or guarantee
For ECO4 grant eligibility, the installer must be registered with the MCS (Microgeneration Certification Scheme) or the TrustMark scheme, as required by Ofgem (Ofgem, 2026). All double glazing installations should be carried out by a company registered with FENSA (Fenestration Self-Assessment Scheme) or CERTASS, which confirms compliance with Building Regulations (FENSA, 2026).
For any grant or warranty, the installer must also be registered with the GGF or the British Fenestration Rating Council (BFRC) for product certification. Homeowners should check the MCS, TrustMark, or FENSA register online before hiring an installer; the government’s Simple Energy Advice service can verify eligibility. Using an unregistered installer may void any guarantee and could result in non-compliance with Building Regulations, which can cause issues when selling the property. how to check if an installer is FENSA registered
What affects double glazing cost in the UK in 2026 beyond the window itself
Additional costs include: removal and disposal of old windows (£20–£50 per window), scaffolding (if above ground floor, £300–£800), and repair of damaged frames or brickwork (£50–£150 per window). These are not optional extras; they are almost always necessary for a proper installation. Energy-efficient glass (e.g., low-E, argon-filled) typically adds 10–15% to the base window price, according to the EST (Energy Saving Trust, 2026).
Custom shapes (e.g., arches, bays) or heritage requirements (e.g., listed building consent) can increase cost by 50–100% per window. The BFRC energy rating (A++ to C) does not significantly affect the base cost but may influence long-term savings; A++ rated windows cost roughly 5–10% more than standard C-rated ones. Over a 20-year lifespan, the energy savings from A++ windows often offset the small upfront premium, particularly in a poorly insulated home. how to read BFRC energy labels for windows
Frequently Asked Questions
The average total cost for a standard 10-window house is between £3,500 and £5,500 in 2026, according to the Glass and Glazing Federation. Per window, uPVC costs £150-£350, aluminium £350-£600, and timber £450-£800.
It may only be covered by the Energy Company Obligation (ECO4) for low-income households meeting specific criteria, as confirmed by GOV.UK.
uPVC is the cheapest double glazing material in 2026, averaging £150-£350 per window supply and installed, per the Glass and Glazing Federation. It accounts for about 80% of UK installations due to its low cost and durability.
A double glazed sash window typically costs £350-£800 per window in 2026, depending on the frame material. uPVC sash windows are at the lower end, while timber or composite sash windows cost more.
Yes, aluminium frames cost £350-£600 per window in 2026, compared to £150-£350 for uPVC, based on Glass and Glazing Federation data. Aluminium offers slimmer sightlines and longer lifespan but at a significant upfront premium.
