Construction industry acronyms - O
O/A - On or About
OA - On or About
OBC - Outline Business Case
OC - On Centre
OCDEA - On Construction Domestic Energy Assessor
OD - Ordnance Datum
OD - Outside Diameter
ODP - Ozone Depletion Potential
ODS - Ozone Delpleting Substances.
OECD - Organisation for Economic Cooperation and Development
OF - Overflow
OFL - Over-Flow alarm
OGSF - Overall Gross Square Footage
OH - Over Head
OH&P - Overhead and Profit
OIL - Open Items List
OIL - Outstanding Items List
OIOO - One In One Out
OIR - Oganisational Information Requirements
OITO - One In Two Out
OLB - Timber Origin and Legality (Origine et Légalité des Bois)
OM - Operating & Maintenance (Manual)
OM - Organic Matter
OML - Ordinary Maternity Leave
OMM / O&MM Operation & Maintenance Manual
ONS - Office for National Statistics
OPC – Ordinary Portland Cement
OPPI - Owners' Protective Professional Insurance
OPR - Owner's Project Requirements
ORC - Organic Rankine Cycle
OS - Ordinance Survey
OSB - Oriented Strand Board
OSI - Open Systems Interconnection (model)
OSL - Overhead Slab Level
OV - Oven
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