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
Featured articles and news
The origins, evolution and future of Level 3 BIM.
For new and returning Urban Design students, check out our article list divided up into the modules you'll be studying.
Report states that health of urban dwellers could be significantly improved by rethinking transport design.
The Kremlin, the centre of Russian power, includes some of the country's finest architecture.
Report launched outlining steps for a national infrastructure system that is efficient, sustainable, and delivers until 2050.
A review of Justin Bere's concise and well-presented introductory guide to Passive House.
This article describes in detail the tender process for a typical commercial construction contract.
What is energy storage, what are the different types and what is its future?
MAD Architects reveal their designs for a state-of-the-art concert hall in Beijing.
Take a look at BIG's designs for two twisting towers in New York City.
'The filing cabinet' which was labelled one of the best British buildings of the 21st century.