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- 1950
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1951/52 P J LAGAN haulage business established
- 1960
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1962 Whitemountain quarries established- 1969 P j lagan contracts established
- 1970
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1970 Armstrong's quarry purchased
1970/71 Blackmountain quarry- 1974 Antrim asphalt established
1979 Roadmix founded
- 1980
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1981/82 Mulholland bros brick & sand- 1982/83 Lagan cement terminal ni belfast(imports) established
1984 Whitemountain surfacing established
- 1985
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1985 Lagan Homes NI Established- 1985 Whitemountain construction established
- 1985/86 Mountain house quarry purchased
- 1986 Whitemountain roadstone established
- 1987 Sept mullaghglass purchased
- 1987 Lagan cement terminal belfast (no.2) established
- 1987/88 Lagan bitumen establishedD
- 1988 Whitemountain asphalt established
1988 Flemings fireclay acquisition- 1988/89 Lagan cement glasgow (imports) established
1989 Lagan asphalt ltd. Established- 1989 Lagan bitumen roi was formed with the emulsion business
- 1990
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1994 Lagan tiles established- 1996 Temple quarry (ni) acquisition
- 1998 Lagan asphalt north east was formed (armagh)
- 2000
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- 2001 Lagan asphalt south west (clare)
- 2002 Lagan asphalt south east (kilkenny)
- 2002 Kennedy quarries
2002 Lagan cement kinnegad
2003 Lagan asphalt midlands (kinnegad)- 2004 Lagan asphalt south (cork)
- 2004 Cork quarry acquisition
- 2005
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- 2005 Lagan asphalt north west (sligo)
- 2005 Lagan asphalt longford
2005 Lagan bitumen dublin port import facility opened- 2005/06 Lagan bitumen dublin established
- 2006 Alpha waste business established
2006 Bitumen shipping vessel ordered
2007 Lagan homes uk established
- 2010
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2010 Healy bros acquisition
2011 Zeeland acquisition - 2014 Acquisition of Readymix Plc quarries, Sligo and Longford ROI
- 2015
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- 2016 Disposal of Cement import facility Zeeland, Netherlands
- 2016 Acquisition of Whelan quarries, ROI