Space Factors and Floor Area Estimates

Use the following space factors when project-costing/estimating using the area method:

Typical floor — 1.00
Auditorium — 1.50
Balcony — 0.40
Canopy entrance — 0.45
Lobby/lofty room — 1.50
Basement — 1.00
On-stilt — 0.55
Covered/partially walled — 0.60
Stairs — 1.25
Toilets — 2.00
Kitchen — 1.50
Media agua — 0.25
AHU — 0.70
Deck — 0.35
Terrace [no roof] — 0.30
Interstitial space > 1.50m — 0.35
Interstitial space < 1.50m — 0.70
Garage — 0.60
Carport — 0.50