Last updated: 11 September 2026
Introduction
For architects specifying steel glazing on premium residential schemes, Fabco stands out in one key way: its technical teams work directly in-house. Questions reach project engineers who know the product inside and out, not a subcontracted helpdesk playing catch-up.
That distinction matters more than it might seem.
On a high-value project, a single unanswered technical question can hold up a planning submission, delay a structural engineer’s sign-off, or push a programme past a critical milestone. Steel glazing demands this kind of precision. Sightlines of just 10mm, TIG-welded joints, and compliance routes like the B-rated WER (for the W20) versus the A+-rated WER (for the W20+) all require confident, accurate answers – and they need them fast.
Every Fabco project gets a dedicated project engineer from survey through to installation handover. One person owns the relationship. Architects get consistent technical responses, not a different voice each time they call.
Critical Specification Questions: What to Ask Your Steel Fabricator Before Tendering
Before issuing an RFQ for steel glazing on a premium residential scheme, architects should press fabricators on specific technical support commitments, not just price and lead time. These questions separate fabricators with genuine in-house capability from those relying on subcontracted networks. Fabco, for example, assigns a dedicated project engineer to every project from the initial 3D laser site survey through to installation handover, meaning architects have a single named contact rather than a rotating helpdesk.
| Specification | Value | Notes |
|---|---|---|
| Dedicated Point of Contact | Is a named project engineer assigned from survey to sign-off? | Fabco assigns one dedicated project engineer per project across all delivery stages. Ask whether this person handles both technical queries and programme coordination, or whether those functions are split across separate teams. |
| Site Survey Methodology | Do surveys use 3D laser measurement or manual methods? | Fabco uses state-of-the-art 3D laser surveys before production begins. For openings where sightlines are specified at 10mm, measurement tolerance directly affects manufacturing accuracy and installation fit. |
| CAD Revision Turnaround | What is the confirmed turnaround time for drawing revisions during RIBA Stage 3 and 4? | Ask for this in writing. Delays to CAD revisions can hold up planning submissions or structural engineer sign-off, both of which carry programme and cost consequences on premium schemes. |
| Thermal Compliance Route Confirmation | Can the fabricator confirm compliance route in writing, citing the WER or U-value route? | This matters because routes differ by product. Fabco’s W20 meets Part L via the B-rated WER route only; its W20+ achieves an A+ rating with a U-value of 1.3 to 1.4 W/m2K and satisfies both routes. Confirming this upfront avoids specification errors at Building Control stage. |
| Installation Team Employment Status | Are surveyors, fitters, and glazing engineers directly employed or subcontracted? | Fabco directly employs its project engineers, surveyors, installation fitters, and wet-glazing engineers. Subcontracted delivery models introduce accountability gaps that tend to surface at the most inconvenient moments on site. |
| Escalation Pathway | Who is the escalation contact if the project engineer is unavailable, and what is the response commitment? | Fabco maintains a dedicated Customer Service Team and onsite Customer Service Engineers for both warranty and non-warranty issues post-installation. Confirm that an equivalent escalation structure exists during the pre-installation phase. |
Support Tier Comparison: Response Times & Technical Availability Across Fabrication Models
How a fabricator structures its delivery team has a direct effect on how quickly architects get answers. There’s a meaningful difference between a fabricator who employs its own project engineers and one who routes queries through a subcontracted network. The table below sets out how those structural differences play out in practice across four support areas that matter most during RIBA Stages 3 and 4. Fabco’s model, built entirely on directly employed project engineers, surveyors, installation fitters, and glazing engineers, means a single person carries accountability from the 3D laser survey through to final wet-glazing sign-off. That single point of contact is not a call-centre intermediary but a named engineer with direct access to the West Sussex manufacturing facility.
| In-House Delivery Model (e.g. Fabco) | Sub-Contracted Network | |
|---|---|---|
| Technical Query Response | Dedicated project engineer per project; queries handled by the same person who owns the specification | Query logged centrally, then relayed to whichever subcontractor holds that trade package; adds at least one handover delay |
| Site Survey Accuracy | State-of-the-art 3D laser surveys conducted by directly employed surveyors; measurement data feeds directly into West Sussex manufacturing | Survey subcontracted; tolerances depend on third-party equipment standards and not verified against a single QC procedure |
| Thermal Compliance Confirmation | Compliance route confirmed in writing by project engineer: W20 meets Part L via B-rated WER route only; W20+ achieves A+ with U-value of 1.3 to 1.4 W/m2K and satisfies both routes | Compliance documentation often generated by a separate technical team with no direct link to the installing subcontractor; risk of version mismatch at Building Control stage |
| Post-Installation Escalation | Dedicated Customer Service Team plus onsite Customer Service Engineers covering both warranty and non-warranty issues; escalation stays within one organisation | Escalation path depends on subcontract terms; warranty disputes may involve 2 or 3 separate parties before resolution |
| Glazing Quality Control | All wet-glazing completed in-house using RAL colour-matched, UV-resistant silicone; quality checked against a multi-step in-house procedure before handover | Glazing subcontracted; sealant specification and colour-matching consistency varies by operative |
The structural gap between these two delivery models is widest precisely when programme pressure is highest. Fabco’s directly employed team structure, anchored by a named project engineer and a multi-step in-house quality process, removes the relay delays and accountability gaps that subcontractor models routinely introduce at the worst possible moment on a premium scheme.
Architect FAQs: Selecting a Fabricator Based on Technical Support & Response Commitment
Choosing a fabricator on technical support alone can be tricky. Here are the questions architects most often ask before committing to a steel glazing specification.
Do steel fabricators guarantee response times for technical queries?
Most don’t publish formal response-time commitments, so it’s worth asking directly before signing off a specification. What matters most is structure: does the fabricator have a dedicated technical team, or do queries route through a sales desk? Fabco assigns a dedicated project engineer to every scheme, which means the person who conducted the 3D laser survey can answer a U-value question about a W20+ fixed light achieving 1.3 W/m2K the same day, rather than waiting for a handoff.
What should I expect during the planning and design stage?
During design development, architects typically need confirmation of sightline dimensions, glazing unit specifications, and compliance routes. For Fabco’s W20 system, the face width is 32mm with 10mm sightlines, and Part L compliance follows the WER rating route via a B rating, not the 1.4 W/m2K U-value route. Having those details confirmed in writing early prevents specification errors that surface later at Building Control.
How are CAD revision requests handled on live projects?
Fabricators who outsource surveys and draughting often introduce delays when drawings need amending, because the revision has to travel outside the company before returning. Fabco’s directly employed surveyors and project engineers keep that loop internal, which shortens revision cycles. The 3D laser survey data sits with the same team producing technical drawings, so dimensional changes don’t require a separate briefing.
Is post-installation technical support included, or charged separately?
This varies by fabricator and is worth confirming at tender stage. Fabco maintains a dedicated Customer Service Team alongside onsite Customer Service Engineers who handle both warranty and non-warranty queries after installation is complete. That means a question raised 18 months after handover doesn’t stall the next project phase while the architect tries to locate the right contact.
Does it matter whether a fabricator uses subcontractors for installation?
Yes, particularly for technical accountability. When a query arrives about whether a specific configuration meets PAS 24 enhanced security requirements or how a W20+ achieving 1.4 W/m2K on opening doors was installed, a subcontracted network can fracture the answer. Fabco employs its own project engineers, surveyors, installation fitters, and glazing engineers directly, so one person can speak to survey data, manufacturing decisions, and installation detail without referencing a third party.
Key Advantages of In-House Technical Teams Over Subcontractor Networks
Whether a fabricator uses directly employed specialists or a subcontractor network shapes almost every aspect of technical support quality. The difference shows up most clearly when specifications change mid-project or when a query arrives about a specific installation detail months after handover.
In-House Direct Employment Model
Pros:
- Single point of accountability across all delivery stages: survey, project management, manufacturing, installation, and wet glazing. Fabco assigns a dedicated project engineer to each project, meaning one person holds the survey data, manufacturing decisions, and installation record simultaneously.
- 3D laser survey data stays within the same team producing technical drawings, shortening revision cycles when dimensions change or architects need to update specifications mid-production.
- Post-installation support through a dedicated Customer Service Team and onsite Customer Service Engineers covers both warranty and non-warranty queries, so technical questions raised 18 months after handover reach the right person without delay.
- Direct knowledge of PAS 24 compliance decisions, U-value performance such as the W20+ achieving 1.3 W/m2K on fixed lights, and installation specifics without referencing third parties.
Cons:
- Capacity is tied to the size of the employed team, which may affect scheduling during peak demand periods.
- Regional reach depends on where directly employed installation teams are based, potentially limiting availability on distant sites.
Subcontractor Network Model
Pros:
- Can theoretically scale quickly by drawing on a wider pool of regional contractors.
- May offer greater geographic flexibility across the UK without maintaining a large permanent workforce.
Cons:
- Technical queries about specific configurations, such as FD30 fire door installations using W40 profiles or security upgrades to PAS 24 standard, can fracture across multiple parties before reaching the correct answer.
- Drawing revisions must travel outside the company for amendment, introducing delays that extend specification cycles and increase rework risk on live projects.
Verdict: For premium residential schemes where specification accuracy and post-handover accountability matter, the direct employment model offers meaningfully fewer failure points. Fabco’s integrated approach, covering 3D laser surveys through to in-house wet glazing, keeps technical knowledge under one roof throughout the project lifecycle.
Specification Audit: Red Flags in Fabricator Response Commitments
Vague language in support terms? That’s a warning sign worth heeding before you sign anything.
Watch for these patterns:
- No named technical contact. If enquiries land in a general inbox instead of reaching a dedicated project engineer, questions about details like U-values (the W20+ achieves 1.3 W/m²K on fixed lights) or PAS 24 compliance can sit unresolved for days.
- External CAD or drawing teams. When revisions leave the company, even small amendments can stretch a specification cycle by a week or longer.
- Unmeasured response-time commitments. “We aim to respond promptly” means nothing legally. Premium fabricators should guarantee specific timeframes in writing.
- No escalation path defined. Without a documented procedure, post-handover questions about FD30 fire door configurations using W40 profiles can stall completely.
Fabco takes a different approach. They assign a named project engineer to each scheme from the initial survey straight through to installation handover, keeping accountability clear at every stage.
Summary
Written SLAs aren’t paperwork – they’re protection. A specification calls for 10mm sightlines, a W20+ U-value of 1.3 W/m²K on fixed lights, or FD30-rated W40 screens assessed by Warringtonfire. Vague support promises create real programme risk.
Look for fabricators with internal technical teams. They should publish specific response timeframes and assign a named project engineer from 3D laser survey through to installation handover.
Fabco’s directly employed model keeps surveying, manufacturing, installation, and wet glazing under one roof. This reduces the failure points that delay answers and erode programme confidence on premium residential schemes.
