CRIT Steel Doors

Each installation is individually designed, so we do not publish a standard price list. As a guide for the Harrow area: internal steel doors (single leaf) run around £2,500 to £4,500, external doors start at roughly £3,800 and can exceed £7,000, steel-framed windows sit at £900 to £1,600 per square metre, and internal screens at £1,500 to £3,000 per square metre. The final total depends on dimensions, glazing, finish, hardware, and fire certification. You will receive a fully itemised, no-obligation quote once we understand your brief.

The standard timeline is 8 weeks from design sign-off to completed installation. Complex or large-scale projects may take longer, but we will flag this early. You will receive progress updates throughout manufacturing so there is never any guesswork.

We do not charge for the initial survey. Our team will visit your property anywhere in Harrow or the neighbouring boroughs to take precise measurements, assess the openings, and walk you through design options in person. This is especially valuable for older homes in Pinner or Harrow on the Hill, where uneven reveals and original features demand a tailored approach.

Steel frames can be drawn down to around 20 mm, delivering remarkably slim sightlines, while aluminium typically needs 40 to 60 mm for equivalent rigidity. Steel will remain in excellent condition for 50 years or more, outlasting aluminium by roughly a decade. Modern thermally broken steel satisfies Part L building regulations just as effectively, so there is no longer a thermal performance gap. The trade-off is cost, with steel generally 20 to 40 per cent above an equivalent aluminium specification. For Harrow’s mix of 1920s semis and period conversions, the authenticity of steel tends to justify the investment.

E30 confirms the door will contain flames and smoke for 30 minutes, making it the standard choice for most residential projects. Our E30 units use 40 mm profiles with 20 mm bars.

EI-rated doors also limit heat transfer. Available in EI30, EI60, and EI90 variants, they resist fire, smoke, and radiant heat for 30, 60, or 90 minutes respectively, with minimum 40 mm profiles and bars. Toughened safety glass ranges from 8 mm to 16 mm. Every component is 100 per cent steel, hinges included, in single and double formats. Across London, Approved Document B and the London Plan commonly require EI30 or higher for HMOs and multi-occupancy buildings. We can review your fire strategy and confirm the right specification.

Crittall is a protected brand belonging to Crittall Windows Ltd, producing steel glazing in Essex since 1884, with lead times often reaching 12 to 16 weeks. Crittall-style describes steel windows and doors built by independent fabricators like CRIT Steel Doors that reproduce the same slim-framed, grid-pane aesthetic. The practical advantages are complete design freedom, an 8-week lead time, and pricing typically 15 to 30 per cent below genuine Crittall. The visual result is virtually identical.

Yes, and we handle these projects regularly. Harrow on the Hill is one of London’s most significant conservation areas, and Pinner’s historic high street is similarly protected. Steel is frequently accepted by Harrow Council, particularly in interwar and mid-century properties where the original fenestration was steel-framed.

Listed Building Consent is required for alterations to listed properties, and Article 4 Directions may restrict permitted development rights in conservation areas. We produce the drawings and specifications planning officers need and can liaise with the council’s conservation team. Consent in Harrow generally takes 8 to 13 weeks, so early engagement is advisable.

We are based in Harrow and serve the entire borough, including Harrow on the Hill, Pinner, Stanmore, Northwood, Edgware, and Wealdstone. We also work across neighbouring Brent, Barnet, Hillingdon, and Ealing, as well as into Hertfordshire (Watford, Bushey, Rickmansworth) and the wider London area. For projects further afield, get in touch and we will confirm feasibility.