How to Switch Aluminium Fabricator Without Losing the Job
A practical guide for installers, shopfitters and maintenance contractors who need to move aluminium fabrication supply mid-programme — what to check, how to transfer specs, system compatibility, and a first-order checklist.
You do not switch aluminium fabricators because you fancy a change. You switch because the current supplier missed a delivery date, quoted three weeks late on a reactive ticket, cut the wrong threshold, or told you a rush job was impossible when the end-client was already on the phone to your director.
The risk is not the switch itself. The risk is losing programme credibility with your customer while you re-establish supply. This guide is written for installers, shopfitters, glazing contractors and door maintenance firms who need to move fabrication supply without making the transition your problem on site.
When switching is the right call
Three situations where staying put costs more than moving:
1. Reactive SLA pressure. If your maintenance contract KPIs depend on replacement supply inside 14–21 days and your fabricator’s standard answer is eight weeks, you are underwriting their production plan with your margin. See our reactive replacement supply process for what a reactive-fit workshop actually looks like.
2. Programme slip on new-build. A single missed shopfront kit can hold up sign-off on an entire retail fit-out. If the fabricator cannot re-sequence your opening without penalising every other customer, you need a supplier with spare reactive capacity — not just a polite account manager.
3. Spec drift you cannot sign off. When quotes keep coming back with substituted profiles, unspecified hardware, or “we’ll confirm on site” caveats, the risk transfers to your fit team. That is when a clean switch beats another round of chasing.
Switching mid-job is viable when you treat it like a controlled handover, not a fire drill.
What to check before you send the first order
Run this checklist against any candidate fabricator before you commit an opening on a live contract.
Trade model
- Supply-only, trade-only. Confirm they do not sell direct to homeowners or offer installation on your patch. Kingsland is supply-only — we fabricate behind the trade; you keep the customer and the install margin.
- No minimum order on single openings. Reactive and phased programmes often need one leaf, one louvre panel, or one window at a time.
- Quote from survey, not only CAD. On replacements, you often have photos and a tape measure, not a Revit model. A fabricator who insists on full CAD before quoting will slow every reactive ticket.
Technical fit
- System compatibility. If the job is on Jack Aluminium TD68, JD47 or JCW, confirm the new supplier fabricates on the same platform or can propose a tested equivalent with written deviations. Our Jack Aluminium compatibility guide maps which systems tie together on mixed schemes.
- Hardware schedule transfer. Locks, closers, panic hardware, access control prep and threshold types must carry over explicitly. “Like for like” without a schedule is how you get a 150mm threshold on a 100mm rebate.
- Finish match. RAL references age on site. Send daylight photos and, where possible, a physical sample. Powder coat from a Qualicoat-approved supplier reduces batch variance between orders.
Operational fit
- Quote turnaround. For reactive work, same-day or next-day quoting is the benchmark. For programme work, 24–48 hours with flagged missing detail is acceptable if consistent.
- Lead time honesty. Standard fabrication lead time should be stated upfront (we aim for 21 days from confirmed PO and signed CAD). Rush options should exist for genuinely critical assets — not as a default, but as an escalation path.
- Delivery to your depot or site. Include the delivery postcode in the first enquiry. We manufacture in Warrington and deliver palletised kits throughout mainland Britain. See mainland UK trade delivery for how we book slots and handle multi-drop programmes.
Quality signals
- Jig-test before dispatch. Leaves fabricated to survey dimensions reduce fit-time on site. We jig-test every order before dispatch and target a 99% first-time fit rate — most suppliers skip this step entirely. Our quotes are often slightly higher because of that workshop time; installers who switch to us typically do so after calculating total job cost, not just fabrication unit price.
- Labelled by opening reference. Multi-opening packages need labels that match your schedule — not a single crate marked “doors”.
- Complete kits. Beads, gaskets, fixings and hardware in the box. Partial kits push cost into your labour line.
How to transfer specs without losing detail
Treat the handover like a structured data migration.
Step 1 — Package what you already have. Gather elevations, survey sheets, hardware schedules, glass specs, finish references and any signed-off CAD from the outgoing supplier. If the outgoing supplier will not release CAD, a dimensioned survey with photos is enough for us to quote — we do this daily on reactive commercial door replacements.
Step 2 — Flag deviations explicitly. Note anything that was value-engineered on the original order (thinner glass, alternate closer, non-standard head detail). The new fabricator needs to know what was actually installed, not what was on the architect’s first issue.
Step 3 — Run a single opening first. Before you move an entire phased programme, send one representative opening — ideally the most awkward one. Measure quote speed, drawing quality, kit completeness and fit-time. If that opening works, scale the relationship.
Step 4 — Align PO and sign-off workflow. Confirm whether the new supplier needs signed CAD before cutting, how PO references map to opening labels, and who takes the call if something is wrong on site. Clarity here prevents “we thought you meant…” disputes mid-install.
System compatibility at a glance
Most switch scenarios we see involve one of these paths:
| Your existing install | Typical switch path | What to watch |
|---|---|---|
| TD68 commercial entrance | TD68 like-for-like | Pivot capacity, panic hardware, access control prep |
| JD47 shopfront door | JD47 like-for-like | Header bar type (manual vs automatic), curtain wall tie-in |
| JCW curtain wall zone | JCW capped or structural | Mullion/transom sizes, drainage path, acoustic glass |
| Older unnamed system | Current Jack equivalent | Threshold depth, hinge centres, glass pocket — survey critical |
| Mixed shopfront + door | JD47 + JCW coordinated | Single supplier for the full frontage avoids interface gaps |
If you are switching because the original system is obsolete, budget time for a site confirmation call. We would rather delay cutting by one day than remake a leaf because the survey missed a 5mm rebate detail.
First-order checklist
Use this on the first order to a new fabricator:
- Opening reference on every document (PO, survey, email thread)
- Delivery postcode and preferred delivery point (depot vs site)
- Hand of door and threshold type confirmed in writing
- Hardware schedule attached — not “same as before”
- Glass spec — thickness, IGU build-up, toughened/laminated
- Finish — RAL code plus site photo
- Signed CAD returned before manufacture starts
- Contact for site issues — name and direct line, not a generic inbox
Send the package via quick quote or email with drawings attached. The more complete the first package, the faster the relationship earns trust.
Protecting margin during the switch
Two cost leaks to close immediately:
Fit-time variance. If the new kits take longer to install than the old supplier’s, your day rate absorbs the difference. Track fit-time on the first three openings and compare.
Callback risk. Security hardware and thresholds generate most callbacks. Specify PAS 24 and BS 6375-tested configurations where the contract requires it — our PAS 24 installer primer explains what changed in the 2022 update.
Reactive overlap. If you are switching programme supply but still have open maintenance tickets on the old supplier, split the workflows. Programme orders need CAD discipline; reactive orders need survey discipline. We cover reactive sourcing in how maintenance firms source replacement aluminium fast.
What we offer when you switch to Kingsland
We are a Warrington-based aluminium fabricator built for trade buyers who need reliable supply behind their customer relationship:
- Supply-only — we do not install or sell to homeowners
- Jack Aluminium systems: TD68, JD47, JCW, TW70, AVS50 and more
- 24-hour quote aim from survey or drawings
- 21-day standard lead time aim; rush options for critical reactive assets
- No minimum order
- Mainland Britain delivery from the workshop
- Direct line to the trade team — call 01925 500 295 or request a quote
If you are mid-programme and need to move supply, send one opening through the process. No commitment beyond that first quote. The point is to see whether our workshop matches how your team actually works — before the next escalation lands in your inbox.