Expansion ratio
The development ratio (AV) , also utilization index , in the property valuation , usable area factor, is an index in the construction industry that describes the ratio of gross volume to living space .
meaning
The expansion ratio is important for property planning (dimensioning), building cost and revenue planning as well as the financing of a property. In Austria, the expansion ratio also has an influence on the amount of architect remuneration according to the fee schedule for architects (HOA).
detection
The ratio of the gross room volume ( BRI ) to the rentable or salable living space ( WF ) is calculated using the formula AV = BRI / WF .
The development ratio depends mainly on the number of floors , the basement and the roof extension . If this information is known, one can estimate the expansion ratio and then deduce the living space from the gross volume and vice versa.
The following overview is based on the following data:
- Basement height: 2.30 m
- Height of normal storey: 2.80 m
- Top floor height: 2.50 m
- Ratio of living space / floor area: 0.75
| Flat roof, no basement (regardless of the number of floors) | ||||||||
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| 3.73 | ||||||||
| Gable roof, not built with a cellar (attic floor not developed) | ||||||||
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| E. | E + 1 | E + 2 | E + 3 | E + 4 | E + 5 | E + 6 | E + 7 | E + 8 |
| 4.29 | 4.01 | 3.91 | 3.87 | 3.84 | 3.82 | 3.81 | 3.8 | 3.79 |
| Flat roof, with a basement | ||||||||
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| E. | E + 1 | E + 2 | E + 3 | E + 4 | E + 5 | E + 6 | E + 7 | E + 8 |
| 6.80 | 5.27 | 4.76 | 4.5 | 4.35 | 4.24 | 4.17 | 4.12 | 4.07 |
| Gable roof, with a cellar (attic not developed) | ||||||||
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| E. | E + 1 | E + 2 | E + 3 | E + 4 | E + 5 | E + 6 | E + 7 | E + 8 |
| 7.36 | 5.54 | 4.93 | 4.63 | 4.45 | 4.33 | 4.25 | 4.18 | 4.13 |
See also
Web links
- Wolfdietrich Kalusche: Floor areas and key planning values for residential buildings at the Technical University of Cottbus , accessed on June 17, 2016
- Theo Stahlhub: Valuation report to determine the market value according to § 194 BauGB sample report , p. 16 (calculation of the expansion ratio)
Individual evidence
- ↑ Thomas Bösl: Expansion ratio / usage ratio glossary, accessed on June 17, 2016
- ↑ Federal Chamber of Architects and Consulting Engineers: Fee schedule for architects HOA Status: January 1, 2002
- ^ OGH : Decision of February 23, 1993 - 4Ob23 / 93 (4Ob24 / 93)