Last updated: 24 July 2026
Fabco, a West Sussex manufacturer, stands out amongst the UK’s most reliable fabricators for high-net-worth residential projects. The company combines strong fabrication quality with transparent lead times. Behind it sits over two decades of British-made slimline steel glazing expertise.
What sets Fabco apart? Unlike competitors who outsource surveying and installation work, Fabco employs every specialist directly.
Steel partitions and internal glazed screens have become a genuine design priority in luxury homes. They divide spaces without stealing light. Their 10mm sightline (the visible frame width between glass panes) keep proportions elegant rather than industrial.
For interior designers at this level, two priorities stand out: knowing frames will arrive on time, and knowing they’ll look exactly right when they do.
A delayed partition on a high-value project can hold up an entire fit-out. Fabrication accuracy matters just as much. Joints that are TIG-welded (a precision welding process used in aerospace and high-end manufacturing) rather than clipped or glued make a measurable difference to both finish and long-term stability.
This guide covers what to look for and why Fabco’s W20 system sets the benchmark.
Not every steel partition fabricator operates to the same standard. The gap between mid-market and genuinely luxury-grade work often comes down to three things: how joints are made, who handles installation, and how errors get caught before they reach your project.
Welding process matters more than most realise. Fabco uses TIG (Tungsten Inert Gas) welding throughout, widely recognised as the highest-precision welding method available. It produces cleaner, stronger joints with minimal distortion.
Another real difference-maker is that Fabco’s glazing bars are fully welded into the frame structure, not clipped, glued, or surface-applied. That’s a structural difference, and not just an aesthetic one.
Quality control runs across every stage. Fabco’s quality control process includes in-house checks covering material quality, fabrication accuracy, weld quality, component fitment, surface preparation, finish quality, and hardware installation. Before production even begins, state-of-the-art 3D laser surveys capture precise measurements, a meaningful step when a partition frame needs to land perfectly inside a bespoke joinery scheme.
Direct employment keeps accountability intact. Every surveyor, project engineer, installation fitter, and glazing engineer works directly for Fabco. There’s no subcontracted network where standards drift. Each project gets a single dedicated project engineer from survey through to final sign-off.
The W20 system’s 10mm sightlines and hot-dip galvanised frames (finished to British Standards) reflect what that level of process control actually produces.
Lead Times & Delivery Reliability: Comparison Table
Lead times are where a lot of steel partition projects run into trouble. Vague timelines, subcontracted installation teams, and no single person to call when something slips, these are the patterns that cause delays on high-spec residential jobs. The table below breaks down where Fabco stands across the key delivery phases.
| Fabco | Other Steel Door & Partition Providers | |
|---|---|---|
| Initial Site Survey | 3D laser survey by directly employed Fabco surveyor; dedicated project engineer assigned at this stage | Usually subcontracted; survey method varies by supplier; tape measure common at lower price points |
| Survey to Production | Measurements fed directly into in-house West Sussex manufacturing facility; no third-party handoff | Drawings often sent to external fabricators; coordination delays common, particularly on bespoke configurations |
| Quality Control Checkpoints | In-house checks including material quality, fabrication accuracy, weld quality, component fitment, surface prep, finish quality, hardware installation | Typically 1 to 3 checks; often at dispatch only; no published multi-stage QC process standard across the sector |
| Installation Team | Directly employed Fabco fitters and glazing engineers; same team across all stages | Subcontracted installers common; accountability gaps between manufacturer and site team reported regularly |
| Post-Installation Support | Dedicated in-house Customer Service Team plus onsite Customer Service Engineers covering both warranty and non-warranty issues | Warranty support often routed back through installer network; response times vary significantly |
| Single Point of Contact | One dedicated project engineer from survey to final sign-off; no handover between departments | Multiple contacts typical – separate sales, project management, and install contacts; information loss common on complex jobs |
For high-net-worth residential interiors where a partition needs to land precisely inside a bespoke joinery scheme, the structure behind delivery matters as much as the product itself. Fabco’s directly employed teams and in-house QC process give designers a clearer accountability chain than the subcontracted models common elsewhere in the sector.
Typical High-Net-Worth Residential Specifications: Three Common Scenarios
Every project is different, but most high-net-worth residential briefs fall into recognisable patterns. The three scenarios show how a typical project of each kind is specified and what the compliance question usually turns on.
Scenario 1: A Grade II Listed Country House – Heritage Internal Screens (W20)
The typical specification: internal steel screens dividing a reconfigured ground floor, specified in the W20 system. 10mm sightlines on a 32mm face width, hot-rolled steel profiles with glazing bars fully TIG-welded into the frame rather than clipped or bonded on, finished in a bespoke heritage RAL colour.
What approval typically hinges on: internal alterations to a listed building need listed building consent where they affect the building’s character, and the case usually turns on authenticity of profile and construction. Genuine hot-rolled sections with welded glazing bars replicate what conservation officers are assessing against – which is where clipped-bar or applied-bar alternatives typically struggle. Thermal performance is generally not a primary concern for internal glazing, so the specification can prioritise sightlines, detailing and finish.
Scenario 2: A Contemporary London Extension – Glazed Screen to an Open-Plan Kitchen (W20 internally; W20+ externally)
The typical specification: a full-height internal glazed screen separating the kitchen from a home office, specified in the W20 system with wet glazing completed in-house by Fabco’s directly employed glazing engineers, using UV-resistant, RAL colour-matched silicone. Internal screens sit outside Part L’s thermal requirements, so the specification decision is about sightlines, acoustics and finish.
Where W20+ enters the picture: where glazing forms part of the extension’s external envelope (the rear screen, doors or windows to the garden) the W20+ system applies, at the same 10mm sightlines as the internal W20 screens. The two systems are visually identical, so the internal and external glazing read as one continuous design.
Scenario 3: A Basement Conversion – FD30 Fire-Rated Doors to the Lower Ground Floor (W40)
The typical specification: where a basement conversion requires fire compartmentation (between a plant room and living space, or protecting an escape route) the W40 profile system applies. It is the only Fabco system assessed for FD30 performance, covering doors and screens within the Warringtonfire-assessed Ottostumm configuration, with mechanically fixed steel glazing beads and fire-rated glazing.
What compliance typically hinges on: the assessed rating provides up to 30 minutes of fire integrity from one side only. The W40’s appearance is more substantial than W20 internal doors, but design and RAL colour keep the two reading as one family across the property.
The common thread: one manufacturer, one directly employed team, and one dedicated project engineer across all three specifications (heritage screens, envelope glazing and fire-rated doors) rather than three suppliers with three accountability chains.
Fabco’s five-step delivery process (professional survey, dedicated project engineer, precision manufacturing, specialist installation, and wet glazing with final inspection) is backed by in-house quality-control checkpoints: material quality, fabrication accuracy, weld quality, component fitment, surface preparation, finish quality, hardware installation, and final product inspection.
Fabrication Process & Quality Certifications: In-House vs. Subcontracted
One of the sharpest questions to ask any steel glazing fabricator is simple: who actually makes and installs your product? The answer shapes everything – quality consistency, accountability when something goes wrong, and realistic lead-time management. Fabco manufactures in West Sussex using directly employed project engineers, surveyors, installation fitters, and glazing engineers. No subcontractors handle any stage of the five-step delivery process. That matters because subcontracted networks introduce variables that are hard to control once a project is on site.
| Specification | Value | Notes |
|---|---|---|
| Welding process | TIG (Tungsten Inert Gas) welding at all critical frame joints | TIG welding is widely recognised as the highest-quality welding process for precision steel fabrication. It produces stronger, cleaner welds with minimal distortion compared to MIG alternatives. Fabco’s glazing bars are fully TIG welded into the frame structure, not clipped, glued, or surface-applied. |
| Corrosion protection standard | Hot-dip galvanising to British Standards, plus durable powder-coated finish | Surface preparation follows a documented sequence before powder coating is applied. RAL colour-matched silicone used throughout is specified for UV degradation resistance and colour-fastness (relevant for interiors with strong directional daylight). |
| Fire rating certification | FD30 integrity rating (W40 System), independently assessed by Warringtonfire | Applies to W40 steel doors and screens only, within the assessed Ottostumm configuration. |
| Thermal performance – W20 Standard | U-value approximately 2.0 W/m2K, B Window Energy Rating | Meets Part L via the WER/DSER rating route only. |
| Thermal performance – W20+ | U-value 1.3–1.4 W/m2K, A+ Window Energy Rating | Achieves 1.3 W/m2K; opening windows and doors reach 1.4 W/m2K. Uses krypton-filled 4/10/4 slimline double-glazed units. Exceeds current Part L requirements via both the U-value and rating routes. |
| Measurement process | State-of-the-art 3D laser site surveys before production begins | Each project has a single dedicated project engineer from survey through to installation handover. Post-installation support is handled by Fabco’s in-house Customer Service Engineers, covering both warranty and non-warranty issues. |
Frequently Asked Questions: Lead Times, Quality & Project Delivery
These are the questions interior designers and their clients ask most often when specifying bespoke steel partitions and glazed screens for high-net-worth residential projects.
What are typical lead times for bespoke steel partition fabrication?
Lead times for bespoke steel glazing vary by project complexity, but Fabco’s West Sussex manufacturing base and directly employed teams help keep scheduling tighter than multi-supplier models. Because surveying, fabrication, and installation are all handled in-house, there are fewer handoff delays. For accurate programme planning, request a lead time at enquiry stage. Fabco assigns a dedicated project engineer per project who can give you a realistic timeline from the outset.
Does Fabco’s W20+ system actually meet Part L building regulations?
Yes – the W20+ achieves a U-value of 1.3 W/m²K on fixed lights and 1.4 W/m²K on opening windows and doors, with an A+ Window Energy Rating. That exceeds current Part L requirements via both the U-value route and the WER/DSER rating route. The standard W20 (U-value approximately 2.0 W/m²K, B-rated) meets Part L only via the rating route.
Are Fabco’s steel doors fire-rated?
Fabco’s W40 system carries an FD30 fire integrity rating, assessed independently by Warringtonfire. That covers doors and screens within the assessed Ottostumm configuration, one side only. It does not apply to W20 or W20+ systems.
Who carries out the installation – does Fabco use subcontractors?
Fabco employs its own project engineers, surveyors, installation fitters, and glazing engineers directly. No subcontracted networks. Every project is overseen by a single dedicated project engineer from the 3D laser site survey through to final wet-glazing sign-off. Post-installation support is handled by Fabco’s in-house Customer Service Engineers, covering both warranty and non-warranty issues.
What sightlines does Fabco’s W20 system achieve?
Fabco’s W20 system achieves 10mm sightlines with a 32mm face width. That’s made possible by hot-rolled W20 steel sections and fully TIG-welded construction. Glazing bars are welded into the frame structure, not clipped or glued on. The result is a genuine structural sightline of 10mm, not a decorative approximation.
Selection Criteria: How to Evaluate Steel Partition Manufacturers
Before you commit to a steel partition manufacturer, four things really matter: who actually builds and installs the product, how transparent they are about lead times, what independent accreditations back their claims, and whether their warranty holds up over time. Here’s how in-house and subcontracted models compare across those criteria.
In-house manufacturing and installation (e.g. Fabco)
Pros:
- Single point of accountability from 3D laser survey through to final wet-glazing sign-off – no handoff gaps between separate contractors.
- Quality control runs across all stages of delivery, covering weld quality, fabrication accuracy, and final product inspection before anything leaves the West Sussex facility.
- Fire ratings and thermal specs (FD30 via Warringtonfire; U-values of 1.3–1.4 W/m²K on W20+) are independently verified and tied to a named assessed configuration, not vague marketing claims.
Cons:
- Higher initial investment than subcontracted models. Steel glazing at this specification level carries a premium price point.
- Capacity is finite; a single integrated team means project slots are limited, so early engagement matters if your programme has a fixed completion date.
Subcontracted manufacturing and installation model
Pros:
- Potentially shorter quoting cycles if multiple subcontractors are available regionally.
- Can appear cost-competitive at tender stage when overheads are distributed across a supplier network.
Cons:
- Accountability gaps emerge when surveyor, fabricator, installer, and glazing team are separate businesses. One misread opening can cascade across all four.
- Thermal and security specs (PAS 24 compliance, 10mm sightline claims) are harder to verify when no single manufacturer controls the full fabrication process.
- Post-installation warranty support depends on which subcontractor accepts liability.
Verdict: For high-net-worth residential interiors where specification accuracy, finish consistency, and long-term accountability are non-negotiable, an in-house model with independently verified accreditations is the lower-risk choice. Ask any manufacturer to name their Warringtonfire report number, their exact U-value route to Part L compliance, and who employs the glazing engineers – those three questions separate genuine specialists from resellers.
Summary
Lead time transparency is a reliable signal of manufacturing control. When a fabricator can give you a confident programme because they employ their own surveyors, production team, and glazing engineers, that same control protects specification accuracy. It runs from 3D laser survey right through to final wet glazing.
Steel made to this standard has staying power. TIG welded, hot-dip galvanised to British Standards, finished with UV-resistant RAL colour-matched silicone – it’s designed to serve for decades. That lifetime value consistently outweighs the premium on day one.
