Building Costs Ready Reckoner
Believe at your peril, I can't quote (or remember!) the sources.
Some of it is from forumdacasa, others (after spreading slightly) private emails.
| Element | Cost €/x or €/m2 |
|---|---|
| Footings/Foundations | 35/m |
| Pillars, 20cm square | 25/m |
| Beams, 20cm square | 20/m |
| 10cm EPS/rockwool | 10 |
| 10cm rockwool (in 2 layers) installed in LSF | 15 |
| LSF 150mm | 30/m |
| ETICS install (ex insulation) | 20 |
| ETICS 100mm installed and painted | 40-80 |
| Tijolo wall, installed | 13 |
| Thermal block wall, installed | 20 |
| Insulated block wall, installed | 40 |
| Plaster and paint, in- or out-side | 10 |
| 2 layers plasterboard plastered and painted | 18 |
| Tyvek menbrane installed | 5 |
| OSB or MGO installed (to LSF) | 12 |
| Delivery from France, 24t/80m3 | 2/km |
- The bottom line would seem to be that:
- walls are about €100/m2 of surface
- 200m2 as 20 by 10 by 3 has a surface of about 180sqm
- roofs and floors and framing is probably a further €200/m2 of living space
So: basic fabric excluding windows and doors is about €400, and the low end is about €350. It does not seem to vary hugely between LSF, double wall, single wall with ETICS, or pre-insulated thermal blocks. This is probably to be expected given commercial pressures.
The remaining costs wil relate to first and second fix, and the standard of fixtures and fittings. And windows - which can be pricey.
It seems tha the standard UK obsession with 'bring the oputside in' may act as a major cost driver and also create all sorts of thermal problems unless shading is carefully designed.