Are steel Crittall worth the premium?

Yes if heritage-correct restoration matters (LBC requirements, conservation area scrutiny) or you want the slimmest 20mm sightlines. Otherwise aluminium look-alikes are excellent value.

Are they energy-efficient?

Modern steel and aluminium Crittall-style achieve U 1.2–1.6 W/m²K with double glazing — Part L compliant. Triple glazed options available at premium.

Can I restore original steel Crittall?

Often yes — strip paint, blast clean, replace gaskets and glazing, prime and paint. £800–£1,800 per window. Better than replacement for heritage.

Does Builderr fit Crittall windows?

Yes — steel Crittall and aluminium look-alikes (internal dividers, doors, windows) as part of renovation and extension packages.

Quick Answer

How Much Do Crittall-Style Windows and Doors Cost in London?

London Crittall-style window and door costs (supplied and fitted): aluminium Crittall-look French doors £4,500–£8,500, internal Crittall-style room dividers £3,500–£7,500, steel Crittall (original W20 frames) £8,500–£18,500 per opening. Steel Crittall has the slimmest sightlines (20mm) and best heritage credentials; aluminium look-alikes are cheaper, easier to source and achieve good thermal performance.

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Steel vs aluminium

Steel Crittall (original brand, est. 1849, still manufactured in Witham, Essex) — 20mm sightlines, slimmest profile, heritage-correct, U-value 1.4–1.6 W/m²K with double glazing. Aluminium Crittall-style (IDSystems, Sky-Frame, Schüco, locally fabricated) — 35–60mm sightlines, U-value 1.2–1.6 W/m²K, easier to source, faster lead times, 40–60% cheaper. For listed buildings and proper Crittall replacement go steel; otherwise aluminium look-alikes deliver 90% of the visual at 50% of the price.

Best uses in London

Internal Crittall-style room dividers — separating kitchen-diner from snug or kitchen from utility — most-fitted application 2024–2026. Crittall-look French doors and bifolds to garden — popular in Victorian and Edwardian rear extensions. Industrial-loft conversions with Crittall partitioning. Front-elevation Crittall restoration in 1930s/Art Deco properties.

Lead time and installation

Steel Crittall: 12–20 weeks lead time from order; longer for listed-building bespoke. Aluminium look-alikes: 4–10 weeks. Both require accurate templating; allow opening tolerances. Original steel Crittall in heritage properties may need restoration not replacement (£800–£1,800 per window restored).

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