Comparisons of lead-time (months) and cost productivity (SEK/m2 GFA) for conventional and IHB timber multi-storey building projects for the year 2018
| Comparing factors | Conventional house buildingb | IHB timber house building |
|---|---|---|
| Number of multi-storey housing projects | 39 | 15 |
| Lead-time 2018, mean value [months] | 20.6 | 17.3 |
| Lead-time development 2014–2018 | + 39% | + 27% |
| Lead-time efficiency 2018, median value [h/m2 GFA] | 0.53 | 0.09 |
| Construction cost efficiency 2018, mean value [SEK/m2 GFA] | 19,783 | 14,930 |
| Construction cost productivity growth 2014–2018a | +20% | –19% |
| Comparing factors | Conventional house | IHB timber |
|---|---|---|
| Number of multi-storey housing projects | 39 | 15 |
| Lead-time 2018, mean value [months] | 20.6 | 17.3 |
| Lead-time development 2014–2018 | + 39% | + 27% |
| Lead-time efficiency 2018, median value [h/m2 GFA] | 0.53 | 0.09 |
| Construction cost efficiency 2018, mean value [SEK/m2 GFA] | 19,783 | 14,930 |
| Construction cost productivity growth 2014–2018a | +20% | –19% |
Notes:
aConstruction costs for comparisons between 2018 and 2014 was adjusted downwards using the Contract Index to get cost figures in 2014 SEK. bBased on data in Koch et al. (2020). It was inaccessible to deduct if some IHB projects were included in the data set
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