Bespoke Windows & Doors
Windows
Steel w20 bespoke grey windows and doors
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When a building is listed for its architectural or historic interest, the replacement window or door must respect the original design intent. Steel is the only material that replicates the slim sightlines, sharp geometry and structural character of period fenestration with complete authenticity.
Timber and aluminium alternatives cannot achieve the same narrow profiles without compromising structural integrity. uPVC is rarely accepted by conservation officers for listed building consent. Steel — and specifically Crittall steel — remains the specification that planning authorities trust and approve.
Beyond aesthetics, our steel windows and doors are hot-dip galvanised and finished in Duralife® polyester powder coat, providing decades of corrosion resistance with minimal maintenance. For heritage projects where longevity and low disruption are essential, this matters.
Tailor your vision with a range of colours, hardware finishes, and window configurations. Explore our downloadable resources to find inspiration and technical specifications to bring your design to life.
Popular Colours
Our steel windows are available in a wide range of bespoke colours, including our signature black steel. We take pride in providing high quality windows that are coated with Duralife Polyester powder, guaranteeing a consistent and durable finish. With so many options available, you're sure to find the perfect match for your property or project.
Selected: Black
Selected: Traffic Grey
Selected: Agate Grey
Selected: Light Grey
Selected: White
Selected: Pastel Green
Hardware
We offer a wide range of high-quality window and door hardware options. Our partnership with Frank Allart, makers of fine English hardware since 1914, ensures that you have access to the best in craftsmanship and design.
Downloads
We understand you may have queries about our products and services. We’ve answered some of the most common questions below.
Yes. Crittall steel windows are widely accepted by conservation officers across the UK because they authentically replicate the original profiles and sightlines of period fenestration. Our T60 range is specifically designed for like-for-like replacement on listed buildings, matching the dimensions and visual character of original steel window installations. We recommend contacting your local planning authority early in the project and can provide technical documentation to support your application.
The T60 range is the primary recommendation for Grade II and Grade I listed buildings. It directly replicates the original Crittall steel window profile in both proportion and appearance. For period residential properties where the original modular metal window was specified, the Homelight® range is the appropriate choice. Our specification team can advise on the correct product for your specific planning brief.
Yes. All Crittall products are manufactured to comply with current UK Building Regulations, including Part L thermal performance requirements. Our thermally enhanced W20 TE® system delivers low U-values without increasing profile width, meaning energy performance improvements can be achieved while maintaining the slim sightlines required for listed building consent.
Yes. Conservation area properties that are not formally listed still benefit significantly from steel window specification. Planning authorities in conservation areas typically require replacement windows to respect the character and appearance of the original building. Crittall steel windows are consistently approved in these contexts due to their authentic profiles and period-appropriate aesthetics.
Crittall provides a comprehensive range of specification resources including NBS clauses, CAD drawings, data sheets, 3D ISO renders and product brochures. All documentation is available to download from our resources section or can be requested directly from our specification team. We also work alongside architects and conservation officers throughout the project process.
Yes. Crittall windows and doors are manufactured to bespoke dimensions and can be produced to suit arched, curved and non-standard openings commonly found in historic buildings. The Corporate W20 system in particular offers the widest range of profile configurations for complex or unusual heritage briefs.
Can’t find the answer you’re looking for?
Speak to an ExpertThe T60 range directly replicates the original Crittall steel window profile. Designed specifically for replacement and refurbishment projects, T60 matches the sightlines, dimensions and visual character of period installations while incorporating modern glazing and thermal performance. It is the first choice for like-for-like replacement on listed buildings.
The Homelight range replicates the original modular metal window system that was specified across residential new builds throughout the twentieth century. Available in 45 standard configurations, Homelight is ideal for conservation area properties and period homes requiring sympathetic replacement.
For heritage projects requiring a wider range of configurations — including larger commercial openings, arched frames or composite assemblies — the Corporate W20 system provides the flexibility to meet complex planning briefs without sacrificing the authentic steel aesthetic.
For a full overview of period property window options, profiles, glazing choices and finish samples available to support conservation officer review, visit our dedicated Steel Windows for Period Properties page.
Contact UsCrittall provides a full range of technical resources to support heritage specification, including NBS clauses, CAD drawings, data sheets and 3D ISO renders. Our specification team works directly with architects, project managers and conservation officers throughout the project process. Approved installers handle submissions and site method statements, and all designs align with Historic England guidance and current Building Regulations.
All products are manufactured in Britain and carry Made in Britain, FENSA and CHAS accreditations — documentation that supports listed building consent applications and procurement requirements.
Contact UsLow-E glass can be specified to meet Part L targets and acoustic requirements while keeping sightlines lean. Trickle ventilation and modern seals improve comfort without changing the period look. Each elevation is surveyed and glass and frame pairings are proposed to balance performance with heritage constraints.
Contact the Crittall team to discuss your listed building project, request a specification pack or locate your nearest approved Crittall Specialist Partner.
Contact UsTransform your home by finding your local Crittall approved installer. Our specialist partners offer a stress-free service from enquiry to after-sales support.