Measurement
In the construction industry, measurement is called an allowance
a) the measurement and recording of an existing building or structure . The construction drawings then serve as the basis for planning . See also construction survey .
b) the determination of the scope of construction work. To do this, the actual object (i.e. on the construction site) is measured, or the scope of services is determined from implementation plans . A measurement can be used for a specification of services or to create a verifiable account. In the context of a unit price contract , the scope of the services provided serves as the basis for invoicing.
According to Section 2 Paragraph 2 VOB / B , the measurement is the basis of the remuneration and, according to Section 14 Paragraph 2 VOB / B, should be carried out jointly by the contractor and the client . The measurement represents the original document, which forms the basis for further tasks.
Based on the measurement, the quantity take-off is carried out (mass determination). Billing provisions can be found for the various trades in the respective sections 5 of the VOB, Part C ( DIN 18299 ff.). Thereafter, for example, in the case of concrete and reinforced concrete work, "when invoicing according to surface area (m²) openings, penetrations and embeddings over 2.5 m² individual size" (Section 5.1.2.2 DIN 18331) are deducted. This means that a normal door opening is overmeasured on a concrete wall.
The quantity take-offs can be carried out manually, with spreadsheet programs or with special computer programs. These are based on the regulations for electronic construction accounting (REB), which u. a. published by the Joint Committee for Electronics in Construction (GAEB) . In the construction industry, the REB 23.003 regulations for electronic construction accounting are used regularly. This regulation also defines interfaces that are used for data exchange between those involved in the construction. The DA11 is the valid interface file for electronic construction accounting. The exchange file X31 from GAEB DA XML 3.2 has also been available since October 2013.
In Austria, ÖNORM A2063 regulates the structure of databases that are automatically exchanged in the tendering, awarding and billing (AVA) phases between all parties involved, such as the LB publisher, planner, client, bidder or contractor.
In Switzerland, according to SIA Art. 144, the contractor has to enclose an amount with every down payment , which, however, must be checked by the construction management.
Web links
- Official website of the GAEB (Joint Committee for Electronics in Construction)
- Information on REB 23.003 , on the GAEB website. There you will find more information and formulas for the DA11 exchange file of REB 23.003 (editions 1979 and 2009)
- Austrian standards database ÖNORM A2063, standard for the exchange of service description, tender, offer, order and billing data in electronic form
