Question 1

How much do windows cost from each supplier?

Accepted Answer

National companies charge a premium: Anglian quotes typically come in at £600-1,200 per window installed; Everest at £500-1,000; Safestyle at £400-700. Local FENSA-registered fabricators and installers typically charge £300-600 per window installed. Prices vary by size, style (casement, tilt-and-turn, sash) and specification. Always get 3+ quotes and compare like-for-like specifications.

Question 2

What WER rating should I look for?

Accepted Answer

Window Energy Ratings (WER) run from A++ (best) to G (worst). Building Regulations Part L 2021 requires a maximum U-value of 1.4 W/m²K or a Window Energy Rating of Band B minimum for replacement windows (AD L 2021 Table 4.2). Most quality double glazing now achieves WER A or better. Triple glazing achieves A+ or A++. Focus on the actual U-value (lower is better) rather than just the WER letter — an A-rated window can range from 1.2-1.4 W/m²K.

Question 3

Are national window companies better than local firms?

Accepted Answer

Not necessarily. National companies (Anglian, Everest) offer comprehensive guarantees and large marketing budgets, but their prices reflect this overhead. Local FENSA-registered installers often provide the same profile systems (Deceuninck, Liniar, VEKA) at lower prices with more personal service. Check that any installer is FENSA or CERTASS registered — this is a legal requirement for self-certification of replacement windows.

Question 4

What profile systems do the brands use?

Accepted Answer

Anglian uses their own proprietary profile with Planitherm glass. Everest uses a mix of proprietary and industry profiles. Safestyle uses various industry-standard profiles. Local fabricators typically use Deceuninck (formerly Eurocell), Liniar, VEKA, Rehau or Kommerling profiles — all high-quality European systems. The profile system matters more than the brand name on the van.

Question 5

Should I choose double or triple glazing?

Accepted Answer

For most UK homes, high-specification double glazing (U-value 1.2-1.4 W/m²K) offers the best value. Triple glazing (U-value 0.8-1.0 W/m²K) costs 20-40% more and is mainly worthwhile for Passivhaus projects, very exposed sites, north-facing elevations and noise-sensitive locations. The payback on the triple glazing premium is typically 20-30 years from energy savings alone.

Feature	Anglian	Everest	Safestyle	Local Fabricator
Cost per window	£600-1,200	£500-1,000	£400-700	£300-600
WER rating	A to A+	A to A+	A	A to A++ (varies)
U-value (double)	1.2-1.4 W/m²K	1.2-1.4 W/m²K	1.3-1.4 W/m²K	1.1-1.4 W/m²K
Guarantee	10-15 years	10-20 years	10 years	10 years typical
Profile system	Proprietary	Mixed	Industry standard	VEKA, Liniar, etc.
Triple glazing option	Yes	Yes	Limited	Yes (most)
FENSA/CERTASS	Yes	Yes	Yes	Check individually

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