When VOB/C over-measurement rules move from the estimator’s head into the model, a painting and drywall contractor bills for what it actually delivers — for the first time.
+214 m²
Recovered surfaces
Reveal and secondary surfaces that previously “simply went missing” — ≈ +8% on billing total.
2 of 3
Complaints fended off
Levelness complaints answered with the DIN 18202 table row and citation — not discussion.
−⅓
Material leftovers
Waste calculated instead of estimated; order lists carry trade-specific factors (diagonal tiles: 15%).
Studio
Billing to standard, automatically
Openings under 2.5 m² measured over per VOB/C — with the paragraph cited in the bill item. Window reveals and edge insulation strips become separate line items.
Assistant
The tolerance shield
Enter measuring-point distance and gauge: DIN 18202 answers with the table row. Defect defense complete with citation, ready to send.
Field & Cloud
Ordering with waste, billing with proof
The auditable measurement sheet with REB line items goes to invoice verification — which waves it through, because the client can recalculate it.
“I always thought we were losing money on the construction site. We were losing it in the billing.”
— Estimator, Farbraum Wenzel GmbH (fictional case, 38 employees)
Source: own reporting · gewerkton.com
A finishing contractor bills for what it actually delivers for the first time — because VOB/C over-measurement rules, reveal surfaces, and waste factors no longer live in the estimator’s head, but in the model.
The fictional Farbraum Wenzel GmbH, 38 employees, painting and drywall work in commercial construction. The classics: tight margins, tough subcontractor contracts, measurement disputes with every client.
The Starting Point
Reveals were “forgotten,” small openings deducted incorrectly (even though VOB/C measures them over), and every third handover brought a levelness complaint — justified or not, nobody really knew.
Studio: Billing to Standard, Automatically
Quantity determination applies the over-measurement rules of each trade — openings under 2.5 m² are measured over, with the paragraph cited in the bill item. Window reveals and edge insulation strips are available as separate line items: in the scenario, 214 m² of reveal surface that previously simply went missing.
The Tolerance Assistant as a Shield
A levelness complaint from the client? Enter the measuring-point distance and the gauge, and DIN 18202 answers with the table row. Two of three complaints in the scenario: within tolerance — the sentence, complete with citation, goes straight into the defect defense.
Field & Cloud: Ordering with Waste, Billing with Proof
Order lists know the trade-specific waste factors (diagonal tiles: 15%). The auditable measurement sheet with REB line items goes directly to the client’s invoice verification — which waves it through, because they can recalculate it.
The Numbers from the Scenario
– Recalculated reveal and secondary surfaces: +214 m² ≈ +8% billing total – Unjustified levelness complaints fended off: 2 of 3, with a DIN citation instead of discussion – Material waste calculated instead of estimated: leftovers reduced by one third
“I always thought we were losing money on the construction site. We were losing it in the billing.”
—
Fictional case study: company, people, and figures are invented and serve illustrative purposes. The basis is the target build-out of the Gewerkton platform (Field, Studio, Cloud, Archive, Operations). Gewerkton is a voice-first platform for construction documentation and defect management for global markets — with the deepest integration into German construction standards (GAEB, REB, XRechnung, DATEV), 27 content languages, and regional AI provider choice.
Powered by Thorsten Meyer AI — https://thorstenmeyerai.com/
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