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Conversion between SCB, SCP, usable area and habitable area — OAI FC.04 and ILNAS 101:2016 standards
Measured or documented area
Surface from which to calculate the others
Number of above-ground floors of the building
Average thickness of facade walls (including insulation)
Average thickness of load-bearing walls and shear walls
Halls, stairs, plant rooms — as % of SCP (apartment buildings only)
Coeff. 0.40 (0.30 above 20 m²)
Coeff. 0.40 (0.30 above 20 m²)
Coeff. 0.20 (0.10 above 20 m²)
Coeff. 0.50
Coeff. 0.50
Coeff. 0.50
Influences the SCB → SCP ratio (facade perimeter vs area)
Minimum ceiling height for habitable surface (ILNAS 101)
Share of usable area below minimum height (attics, sloped ceilings)
Average selling price per saleable m²
OAI FC.04 (Jan. 2025) — Surface calculation sheets, Order of Architects and Consulting Engineers. ILNAS 101:2016 — Luxembourg standard for habitable surface measurement. ACT — Practical guide to vertical cadastre (Jul. 2023), Administration of Cadastre and Topography. RGD PAG art. 32 — Definition of Gross Built Surface.