Insulated-glass-unit quotations can appear comparable when each supplier states a price per m². They are not comparable when the unit make-up, stated dimensions, coating or spacer description, rack loading, transfer assumptions or receiving rule changes between offers. For a Turkey-to-Germany purchase, the glass unit and the condition in which the named German point can receive, identify and record it belong in the same buying decision.
This is a buyer-control checklist, not glazing design, product testing, customs, transport-safety or legal advice. It does not establish product suitability, performance, classification, duty, import VAT, packing safety, carrier acceptance, site access, breakage or seal performance. Confirm the transaction-specific position with the responsible technical reviewer, broker, forwarder and receiving team before releasing a deposit, purchase order or shipment.
Short answer: when are two insulated-glass offers comparable?
Only when every supplier is pricing the same controlled unit and the same delivered acceptance basis. Align the supplier reference, stated overall dimensions and make-up, stated glass and coating description, spacer and edge-seal description where relevant, required drawings or revision, rack plan, Incoterm named place, delivery assumptions and receiving rule. A lower price per m² is not a lower delivered cost if the units cannot be carried on the stated rack, received at the German point or reconciled as the agreed accepted unit.
| Control field | Buyer question | Evidence owner |
|---|---|---|
| Controlled unit | Which supplier reference, stated dimensions, pane make-up, coating or finish description, spacer, edge-seal description, drawing, sample or revision are being compared? | Supplier, checked by buyer or technical reviewer |
| Opening and identity basis | Which project opening, unit mark, quantity and stated orientation belong to each unit, and what label must remain visible through the handoffs? | Buyer and supplier |
| Loaded rack record | What are the rack ID and type, loaded dimensions and gross mass, unit count, orientation, separation, restraint, stated handling points and return arrangement? | Supplier and forwarder |
| Acceptance unit | Are costs compared per ordered m², delivered unit, or specified unit accepted under the documented receiving rule? | Buyer and receiving team |
Do not infer glass make-up, coating face, spacer, seal, dimensions, rack capacity or handling suitability from a photograph, catalogue image or earlier project. Keep the dated quotation, controlled unit record, rack schedule and current route assumptions in one comparison file. The LandedSpec landed-cost analysis for Europe explains how to keep the cost model useful without turning open assumptions into confirmed facts.
Issue one controlled unit and rack record before asking for freight
Give every supplier the same response structure. For each unit, record the supplier reference and project mark; stated outer dimensions and make-up; stated pane thicknesses, glass or coating description and coating face where relevant; spacer and edge-seal description; edgework, holes, cut-outs or shape where applicable; stated orientation; and the drawing, sample or revision that governs the order. If a point is unconfirmed, keep it as an open buyer question. A familiar facade description does not identify the actual buying unit.
Then request a dated rack record for the actual order quantity:
- rack ID, type, ownership or return arrangement, units by mark and the supplier's stated m² basis;
- loaded rack length, width, height and gross mass, with the measurement or calculation basis named;
- unit orientation, separation material, protection at exposed edges or corners, restraint, stated stack limit and permitted fork, crane or lifting points;
- label format and placement, plus the process for recording a unit that is missing, mixed, visibly affected or released to a different opening;
- pickup address, loading hours, collection readiness, any consolidation point and the named German delivery point; and
- the offered condition, such as EXW, FCA or DAP, with the exact named place and exclusions written out.
The freight and Incoterms guide helps separate carriage and handoff questions from the commercial offer. It does not make an incomplete rack, mass or unloading record bookable.
Test route and unloading options against the same rack schedule
Ask a forwarder to assess only options that are physically and operationally feasible for the declared rack schedule. A direct vehicle, a transfer through a holding point and a timed site delivery can be useful comparison models. They are not interchangeable price lines. Keep the controlled unit list, rack dimensions and masses, pickup, German destination and stated delivery basis constant while asking what changes in loading sequence, transfer count, vehicle access, unloading equipment, waiting time, rack return and exception ownership.
| Option to test | Keep constant | Ask before ranking it |
|---|---|---|
| Direct vehicle delivery | Controlled unit and rack schedule, pickup and named German point | Can the vehicle, declared rack load, access route, unloading surface, equipment and time window be accommodated as stated? |
| Transfer or holding point | The same racks, unit identity and handling needs | Who receives, stores, counts and releases the racks, and which record follows the unit mark and stated orientation? |
| Timed site delivery | The same commercial scope and labelled racks | Who appoints the delivery, supplies the equipment, records visible condition and accepts or returns the rack? |
Request exclusions and operational assumptions in writing. “Site delivery included” does not name the unloading machine, operator, permitted standing area, waiting-time approval, safe rack location, return movement or responsibility for units that cannot be accepted at the appointed time. The doors and windows site-delivery checklist offers an adjacent discipline for documenting the final handoff.
Make German receipt an evidence gate
Before booking, the German receiving point should confirm a contact, delivery date and time window, vehicle-access limits, unloading surface, equipment, operator, safe rack location, count method, unit-mark check and exception process. A postal address alone does not show whether the loaded rack can be set down, identified and released. Treat any crane, forklift, glazing equipment, onward movement, rack return or temporary storage need as open until the site owner accepts it.
At receipt, preserve the comparison evidence before units are separated, moved to openings or mixed with another rack. Count units against the rack and packing record; photograph labels, restraints, exposed edges, corners and visible condition; note the rack ID, unit mark, stated orientation and destination opening; and record any missing label, count difference, impact, moisture, edge issue, handling exception or uncertainty about the unit identity. This is not a universal damage or quality protocol. It prevents the planned acceptance basis from disappearing before buyer, supplier and carrier can assess the actual handoff.
Finish the cost model on the accepted specified unit
Model goods, origin handling, freight, insurance if applicable, clearance-related costs, destination handling, rack-return movement if applicable and inland delivery at the stated point. Allocate a shared shipment cost only with a driver that fits the cost, such as actual rack footprint, mass, direct handling or a documented cause. Keep the shipment control total separate from the supplier-comparison view.
Show at least two measures: cost per ordered m² on the supplier's stated basis, and cost per specified unit accepted under the documented receiving rule. Do not silently turn a rack, label, identity, count or unloading exception into a normal accepted unit. The construction-material landed-cost calculator can organise confirmed planning inputs; it does not determine customs value, tariff treatment, tax, carrier charges, technical suitability or product acceptance.
Release only after three gates
- Before comparing quotations: every supplier has supplied the controlled unit record, stated m² basis, rack schedule, Incoterm named place and acceptance unit.
- Before booking freight: the approved rack list, collection readiness, vehicle and unloading assumptions, delivery appointment, rack-return plan and exception owner are reconfirmed.
- At receiving: the team records count, identity, orientation and visible condition before handling changes the evidence, then reconciles accepted specified units with the purchase record.
For the first order, retain the approved unit record, quotation, rack schedule, route assumptions, delivery confirmation, receipt exceptions, rack-return record and cost-allocation basis in one file. Use that file as the response structure for the next RFQ instead of assuming another supplier's rack or m² convention is equivalent.
If your team is still deciding whether two offers are comparable, start with the free quote-readiness check. If the decision already needs source work across unit scope, racks, route and delivered cost, request a LandedSpec pilot report. It will expose missing evidence and decision boundaries; it will not approve a supplier, shipment, customs outcome, product use or installation for you.