Over 4.1 million homes in Great Britain still have single glazing, according to the 2023 English Housing Survey (DESNZ)
If you are still living with single glazing, you are not alone. The Department for Energy Security and Net Zero reports that over 4.1 million homes in Great Britain have not yet upgraded (DESNZ, 2024). This article explains how to compare the leading double glazing brands in the UK market in 2026. The focus is on the decision angle: trade-offs between price, performance, warranty, and installation quality.
The direct answer is that for most homeowners, a mid-market brand like Anglian or Sheerwater offers the best balance of price, warranty, and energy performance. These brands typically cost £1,000 to £1,500 per window installed with a 20-year warranty and an A+ energy rating.
The five largest double glazing brands by UK market share in 2026
Everest, Safestyle, Anglian, and CR Smith are the most recognised national brands, each with a distinct market position. Everest is the premium brand with a lifetime guarantee. Safestyle is the budget-conscious option. Anglian is mid-market with a strong heritage. CR Smith is Scotland-focused. Other regional brands like Sheerwater (South East) and Clearview (South West) are also significant. Market share estimates are based on MCS register data and industry trade body reports from the Glass & Glazing Federation (GGF, 2026).
How to compare frame materials and glazing specifications across brands
Each brand offers a choice of uPVC, aluminium, or composite frames. uPVC is the most common for double glazing because it is affordable and insulates well. Key specifications to compare include the U-value, which measures heat loss. The target for double glazing in 2026 is 1.2 W/m²K or lower. The energy rating should be A+ or A++ on the British Fenestration Rating Council (BFRC) scale. Acoustic performance is measured in decibels (dB); aim for 30 dB or higher for noise reduction. There is a trade-off: cheaper brands may use 24mm double glazing units, while premium brands often use 28mm or 30mm units for better insulation. Check the BFRC energy label on each quote (BFRC, 2026).
Quick numbers price range, warranty length, and typical payback period for the top five brands
| Brand | Typical price per window (installed) | Standard warranty | Energy rating (typical) | Estimated annual heating saving vs. single glazing |
|---|---|---|---|---|
| Everest | £1,200–£1,800 | Lifetime (transferable) | A+ | £150–£200 |
| Anglian | £1,000–£1,500 | 20 years | A+ | £150–£200 |
| Safestyle | £700–£1,100 | 10 years | A | £120–£170 |
| CR Smith | £800–£1,300 | 15 years | A+ | £140–£190 |
| Sheerwater | £900–£1,400 | 20 years | A+ | £150–£200 |
Savings estimates are based on the Energy Saving Trust’s published figures for a typical semi-detached home upgrading from single glazing (Energy Saving Trust, 2026). Prices are GGF member survey averages for 2026 and vary by region and window size (GGF, 2026).
The direct answer which double glazing brand offers the best value in 2026?
For most UK homeowners, the best value is a mid-market brand like Anglian or Sheerwater. Both offer a 20-year warranty and A+ energy rating at a price point between the premium and budget options. The trade-off is clear: Everest’s lifetime warranty and premium service come at a 30–40% price premium over Anglian. Safestyle’s lower cost comes with a shorter warranty and a lower energy rating of A rather than A+. Your decision depends on your budget, planned length of stay, and whether you value the lowest upfront cost or the longest guarantee.
How to verify an installer MCS certification, TrustMark, and FENSA registration
All installers must be FENSA or CERTASS registered for Building Regulations compliance under the self-certification scheme (GOV.UK, 2026). MCS certification is required if the windows are part of a heat pump or solar thermal installation, for example when claiming energy-efficiency grants (MCS, 2026). TrustMark accreditation is a sign of quality workmanship and consumer protection. Check each brand’s installer network for this accreditation (TrustMark, 2026).
The warranty trade-off what is actually covered by each brand’s guarantee?
Everest’s lifetime guarantee covers the frame and glass for the original homeowner. It is transferable but only applies to the first five years of a new owner. Anglian’s 20-year guarantee covers the frame, glass, and hardware. It is non-transferable after the first 10 years. Safestyle’s 10-year guarantee covers the frame and glass, but hardware is covered for only 2 years. Always read the full terms on the brand’s website. The GGF code of practice requires clear disclosure of what is and is not covered (GGF, 2026). Understanding window installation warranties in the UK
How to get a quote and what to look for in the small print
Request quotes from at least three brands for the same specification, including U-value, frame material, and number of windows. Look for hidden costs such as delivery charges, removal of old windows, scaffolding, and VAT. Most window installations are standard-rated for VAT, not zero-rated. Check the cancellation policy: the Consumer Contracts Regulations give a 14-day cooling-off period for online or phone sales (Consumer Contracts Regulations 2013). The GGF publishes a guide on how to choose a window installer, which is worth reading before you sign (GGF, 2026). How to avoid common double glazing installation problems
Frequently Asked Questions
For most homeowners, Anglian offers the best balance of price, warranty, and energy performance. Everest is the premium choice with a lifetime guarantee, while Safestyle is the budget-friendly option, per GGF 2026 data.
Mid-market brands typically cost £1,000 to £1,500 per window installed, including fitting. Budget brands like Safestyle may start lower, but check warranty and energy ratings, according to industry reports.
A good U-value for double glazing in 2026 is 1.2 W/m²K or lower. This meets current building regulations and ensures effective heat retention, as per the British Fenestration Rating Council (BFRC).
Yes, if you value a lifetime guarantee and premium materials. Everest is the most expensive national brand, but their warranty and energy ratings are top-tier, according to MCS register data.
Compare U-values (target 1.2 W/m²K or lower), BFRC energy ratings (A+ or A++), warranty length, and installation quality. Check customer reviews and GGF accreditation for reliability.
