Last updated: 9 September 2026
Introduction
Fabco is amongst the strongest industrial-style alternatives for bespoke steel windows and internal glazed screens in the UK. Fabco stands out for long-term durability and finish quality through its 10mm sightlines, TIG-welded construction, and hot-dip galvanising to British Standards.
Why are homeowners looking beyond other industrial-style specialists? Three reasons dominate: lead times, finish consistency, and post-installation support. In the premium residential market – where projects routinely run to £50,000+ in glazing spend – buyers want a single accountable team, not a chain of subcontractors.
Three factors define ‘premium’ in steel glazing:
- Thermal performance – W20+ systems now achieve U-values of 1.3-1.4 W/m²K, exceeding Building Regulations Part L
- Finish integrity – powder coating durability and RAL colour-matched silicone glazing seals
- Bespoke capability – fully welded glazing bars, not clipped or decorative additions
Fabc: The Leading Industrial-Style Alternative
Choosing between premium steel glazing suppliers is harder than it looks. The brand names all sound similar, but the specs – and the experience of actually working with them – can be very different. Pricing reflects typical 2026 supply-and-install rates for bespoke internal screens and external windows; exact quotes will vary by project complexity, glazing type, and location.
| Fabco | |
|---|---|
| Manufacturing Location | West Sussex, UK |
| Minimum Sightline | 10mm (W20 system) |
| Thermal Performance (U-value) | 2.0 W/m²K (W20 standard); 1.3-1.4 W/m²K (W20+, A+ rated) |
| Building Regulations Part L | W20 meets via B-rated WER route; W20+ exceeds via both U-value and rating routes |
| Fire-Rated Option | Yes – W40 internal door system, FD30 assessed by Warringtonfire |
| Glazing Bar Construction | Fully TIG-welded into frame structure – not clipped or bonded |
| Installation Model | Directly employed surveyors, fitters, and glazing engineers – no subcontractors |
| Typical Price Range (supply and install) | £2,200-£3,500 per m² approx. |
For projects where thermal performance, finish accountability, and a single point of contact matter most, Fabco’s W20+ system – with its A+ energy rating and 1.3-1.4 W/m²K U-value – sits ahead of others. The real differentiator is delivery: Fabco’s directly employed installation teams remove the subcontractor risk that can undermine finish quality on premium residential projects.
Use-Case Recommendations
Different projects need different solutions. Here’s how to find the right match.
1920s terraced house, non-listed: A mid-tier supplier with W20-profile systems at £1,600-£2,800 per m² does the job. Budget discipline matters more than deep specification work, and keeping four windows looking consistent is straightforward.
Listed building or conservation area: Fabco is the better choice. Hot-dip galvanising to British Standards, fully TIG-welded glazing bars (not clipped or bonded), and 10mm sightlines that echo original steel proportions all count when a conservation officer reviews the paperwork. The W20 system’s B-rated WER also ticks Building Regulations Part L via the rating route for replacement windows.
Contemporary extension, high-spec residential: Fabco’s W20+ delivers 1.3-1.4 W/m²K and an A+ energy rating – useful ammunition for architects building a thermal performance case. The in-house installation team, with no subcontractors involved, cuts the risk of finish problems that stand out on big glazed walls.
Commercial hospitality with fire compartmentation requirements: Fabco’s W40 FD30 system has independent assessment from Warringtonfire and covers doors and screens within that assessed configuration. That’s a real advantage when Building Control approval is non-negotiable.
Frequently Asked Questions
These are the questions homeowners and architects ask most often when comparing premium steel glazing suppliers – with straight answers.
How long do steel windows actually last?
Many original steel windows installed in the early twentieth century are still in service today, giving a real-world lifespan of 80-plus years with proper maintenance. Modern powder-coated systems with hot-dip galvanising to British Standards perform better still. Steel does not warp, twist, or creep the way timber and uPVC can over decades.
What thermal performance should I expect from modern steel windows?
It depends on the system. Traditional single-glazed steel typically delivers a U-value above 5.0 W/m2K. Fabco’s standard W20 with slimline double glazing achieves approximately 2.0 W/m2K and a B Window Energy Rating, meeting Building Regulations Part L via the rating route for replacement windows. The W20+ reaches 1.3-1.4 W/m2K and an A+ rating, exceeding Part L on both the U-value and rating routes.
What is the difference between direct installation and subcontracted installation?
With subcontracted installation, the manufacturer hands the project to a third-party team once fabrication is done. Fabco instead employs its own surveyors, installation fitters, and wet-glazing engineers directly. Every project gets a dedicated project engineer as a single point of accountability from the 3D laser survey through to final glazing sign-off. That matters for finish quality on bespoke work where tolerances are tight.
Are Fabco windows suitable for listed buildings and conservation areas?
Yes. The W20 system uses hot-rolled steel profiles with 10mm sightlines and fully TIG-welded glazing bars – proportions that closely match original early twentieth century steel fenestration. Hot-dip galvanising to British Standards provides corrosion resistance without adding visual bulk. These characteristics are relevant when a conservation officer or listed building consent application requires evidence of authenticity.
How does finish quality vary between suppliers?
The main differences are in the glazing process and silicone specification. Fabco uses professional wet glazing completed by directly employed engineers, with RAL colour-matched silicone selected specifically for UV degradation resistance and colour-fastness. Suppliers who subcontract glazing introduce a quality-control gap at the most visible stage of the installation. Glazing bar construction is another tell: Fabco’s bars are fully TIG-welded into the frame, not clipped or bonded on top.
Summary
For buyers where lifetime value outweighs upfront cost, Fabco’s case is hard to argue against.
The W20+ system hits a U-value of 1.3-1.4 W/m²K with an A+ energy rating, exceeding current Part L requirements. The W20 standard system meets Part L via the WER/DSER route with a B rating. Sightlines hold at 10mm throughout both. All glazing bars are TIG-welded into the frame structure, not clipped on.
What separates Fabco from most competitors isn’t just the product spec. It’s the delivery model. We employ our own surveyors, fitters, and wet-glazing engineers. They use 3D laser surveys and assign a dedicated project engineer to each job. These steps remove the accountability gaps that bespoke steel work can’t afford.
For quality-first buyers, that’s the decisive difference.
