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Building materials on site: ownership, payment and security under the works contract
Who owns stored or installed building materials? Check ownership, payment, retention of title, insolvency risk and records.
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30 August 2026 · Mag. Bernhard Brandauer, Rechtsanwalt
Materials are often on site before the invoice is fully paid. Delivery, storage and installation may create different ownership issues.
This matters when a supplier claims ownership, a contractor demands payment or insolvency is approaching.
Keep delivery notes, payments, retention clauses and installation in a chronological file.
For ownership under Austrian civil law, ABGB sections 353, 354 and 424 are particularly relevant; section 367 concerns good-faith acquisition. The scope of a retention-of-title clause must be checked in the actual agreement.
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Dispute or work started
Secure the file and evidence immediately.
Place delivery and ownership in time
Place delivery and ownership in time
Delivery does not automatically resolve ownership. Agreement, retention, payment and processing must be read together.
Identify the material, location, contracting party and possession at delivery. For the payment side, see the guide to construction contracts and remuneration; ownership remains a separate question.
Document installation and evidence
Document installation and evidence
Installation or irreversible connection changes access. Record time, condition, photographs and measurements.
This is especially relevant to windows, services, façades and bespoke components. The construction litigation and evidence guide helps organise these records.
Prepare payment and insolvency
Prepare payment and insolvency
Interim payments should match delivery and performance. If financial trouble arises, secure materials, agreements and access immediately.
An early inventory prevents unauthorised removal and duplicate claims. The construction project risk assessment provides a further first orientation.
Compare retention of title with installation
Compare retention of title with installation
A retention-of-title clause may postpone transfer of ownership until full payment. Whether it remains enforceable after installation, processing or connection depends on the agreement, the material and the actual stage of construction.
Open invoices, the retention clause and the condition of the installed material should therefore be reviewed together. A blanket attempt to remove connected components may misstate the legal position.
Review points
Building materials on site: ownership, payment and security under the works contract
| Question | Next step |
|---|---|
| Place delivery and ownership in time Delivery does not automatically resolve ownership. Agreement, retention, payment and processing must be read together. | Identify the material, location, contracting party and possession at delivery. |
| Document installation and evidence Installation or irreversible connection changes access. Record time, condition, photographs and measurements. | This is especially relevant to windows, services, façades and bespoke components. |
| Prepare payment and insolvency Interim payments should match delivery and performance. If financial trouble arises, secure materials, agreements and access immediately. | An early inventory prevents unauthorised removal and duplicate claims. |
Process
Three steps to a reliable file
- 01Step 101Step 1
Place delivery and ownership in time
Delivery does not automatically resolve ownership. Agreement, retention, payment and processing must be read together.
- 02Step 202Step 2
Document installation and evidence
Installation or irreversible connection changes access. Record time, condition, photographs and measurements.
- 03Step 303Step 3
Prepare payment and insolvency
Interim payments should match delivery and performance. If financial trouble arises, secure materials, agreements and access immediately.
Practical tip: With materials, chronology matters. Delivery note, invoice, payment, storage and installation should remain connected.
FAQ
Building materials on site: ownership, payment and security under the works contract
Does paid material automatically belong to the owner? +
It depends on the agreement, retention of title, delivery and processing.
What should be recorded? +
Supplier, delivery note, location, quantity, invoice, payment and installation should be traceable.
What matters in insolvency? +
Secure materials, agreements, payments and access, then review allocation between supplier, contractor and owner.
Further reading
Further topics in construction law
Topics
construction lawconstruction projectland registeragreement
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