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ARE PA - Building Efficiency

Terms in this set (20)

Gross Building Area
Includes: Exterior walls and everything within
Gross Area (for code purposes not zoning)
Includes: Everything within exterior walls (mezzanines, interstitial spaces such as a mech floor, attics, garage, covered porch)
Excludes: Exterior walls
Net Assignable Area
Includes: Interior walls + columns + projections
Excludes: Exterior walls, vertical penetrations, core, service areas, primary circulation, secondary circulation
Usable Area (Departmental Gross Area)
Includes: Interior walls + columns + projections + secondary circulation
Excludes: Exterior walls, vertical penetrations, core, service areas, primary circulation,
Rentable Area
Includes: Usable area + Building core + Service + Primary Circulation
Excludes: Exterior walls, vertical penetrations
Overall Building Efficiency
Net Assignable area/ Building Gross area

Between 50% for a building with many small rooms and a lot of circulation and up to 90% for warehouses
Base Building Efficiency
Useable area / Building Gross area

Usually about 80%
R/U Ratio (loss factor)
Rentable Area/ Usable Area
Interior Layout Efficiency
Net Assignable area / Usable area.
Building Costs
All costs of construction within 5 feet of building line
Fixed Equipment Costs
All equipment items installed before completion (ie. lockers, medical equipment, fixed seating)
Site Development Costs
All required that lies between 5' of the building line and site boundaries. (ie. grading, walks, street furniture, treatment plants)
Cost analysis items
A. Building Costs
B. Fixed Equipment
C. Site Development
D. Total Construction
E. Site Acquisition /Demo
F. Movable Equipment
G. Professional Fees
H. Contingencies
J. Admin Costs
K. Total budget
Typical Efficiency Ratios
Offices - 60%-85%
Restaurants - 65%-70%
Libraries - 75%-80%
Museums - 80%-90%
Theaters - 60%-75%
Hospitals - 50%-65%
Typical Size of Nonassignable Areas
Circulation - 15%-25% of gross area
Mechanical - 5%-9% of gross area
Structure - 7%-9%
Public Toilets - 1.5%-2% (50 sq ft for single toilet rooms)
Circulation Area
A horizontal or vertical path of travel
Primary/Major: Lobbies, corridors, elevators
Secondary: Provide access from net assignable areas to primary circulation
Service Area
An area used to support the building as a whole and not an individual occupant
Includes building storage, janitorial rooms, public restrooms
Mechanical Area
Area that involves mechanical equipment, shafts, or utility services
Tare Area
Area that includes non-assignable and structural; area left over when subtracting assignable area from gross area
Non-assignable Area
Area necessary for building use/running but not directly assigned to an occupant
Includes major circulation, mechanical, service
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