Developer Feasibility

Weighted area excluding common parts

Average selling price per sellable m²

Gross external area (GEA) or floor area

Works cost per gross m² (€2,500–3,500/m² in Luxembourg)

Soil, geotechnical, environmental studies, etc.

6–10% of works amount

Technical design office — 3–6%

Provision for unforeseen costs (3–8%)

Sales commission, marketing (2–4%)

Interest on developer loan (2–4%)

Project management, site supervision (1–3%)

Share of revenue pre-sold under VEFA before works start