Lifecycle analysis conclusions

The main results of the study are as follows:

• The massive houses (Optimo) cause a CED that is 20 per cent higher than the similar houses in lightweight construction (Quattro houses).

• The construction of light frame houses causes less CED than masonry houses. Comparing the Quattro houses with and without basements, the strong influence of reinforced concrete is especially evident, increasing the CED by 22 per cent.

• When the CED of the whole site development is considered, the construction of the houses themselves account for 77 per cent (15 GWh) over their 50-year life expectancy; the infrastructure (roads, pipes, etc.) results in 23 per cent of the CED on a per house basis.

• Over this period of 50 years, the primary energy demand for heating amounts to approximately 22 GWh and is therefore in the range of the primary energy use for construction, maintenance and decommissioning.

• The CED from additional insulation and solar technologies is easily justified by the resulting energy savings.

Table 3.4.1

The building costs

Costs for mounting, PV and solar collectors:

including value-added tax and planning

including value-added tax and planning

Average cost

40,819

Land cost for the central plant

2362

Photovoltaic and solar thermal

Photovoltaic

8175

Structure

1151

Solar thermal

3670

Engineering

716

Coordination and administration

1023

Blower-door test

511

Total

including value-added tax and planning costs and the land _

from_180,000

to 235,000

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