| 1994 |
- the French company COLAS SA becomes the majority owner of all of the above-mentioned companies
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| 1997 |
- ASTECH, s.r.o. - establishment of the company, which sells and applies modified asphalts and other special asphalt products used in road engineering with the application of the latest technologies
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| 2001 |
- 31 January 2011 – merger of Silnice Jihlava, Silnice Znojmo and Silniční stavitelství Praha with COLAS CZ a.s.
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- within a year, COLAS CZ obtains 100% ownership in SANGREEN, spol. s r.o. (established in 1990), which is one of the leading companies in the rehabilitation of bridges and other concrete and steel structures and objects.
- COLAS CZ owns one-third of Obalovna Bradlec, s.r.o. (established in 1998), which is based in Mladá Boleslav.
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| 2002 |
- 1 January 2002 – new organizational structure – Agency South is established by merging of construction agencies in Jihlava and Znojmo
- Agency North consists of construction agencies in Prague and Hradec Králové
- production of crushed aggregate is concentrated in the Quarries Agency
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| 2005 |
- acquisition of Kamenolom Císařský a.s. (established in 1994) by COLAS SA and its integration into the COLAS group as an affiliated company
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| 2006 |
- new acquisition – Čermák a Hrachovec, a.s. involved in repairs, reconstruction and also the construction of new constructions in the area of water supply and sewerage lines, especially in Prague and the Central Bohemian Region
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- after purchasing shares from minority shareholders, the parent company COLAS SA owns 100 % of COLAS CZ, a.s.
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- annual production of 2 million tonnes is reached for the first time
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| 2008 |
- 1 October 2008 – merger of ASTECH, s.r.o. with COLAS, CZ a.s. ASTECH is still involved in the latest technologies, production and application of hot asphalt mixtures and modified bitumen binders for road engineering
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| 2012 |
- merger of Císařský Kamenolom with COLAS CZ. It becomes part of the Quarries Agency
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| 2013 |
- with the acquisition of PRAKAN a.s., the COLAS group expands its portfolio into the area of water management facilities
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| 2014 |
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| 2017 |
- COLAS SA sells shares corresponding to 100% stake in Čermák a Hrachovec a.s. and Prakan a.s.
- merger of SANGREEN, spol. s .r.o. with COLAS CZ, a.s.
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| 2018 |
- Merger of the company SOMARO spol. s.r.o. to COLAS CZ, a.s.
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| 2020 |
- the company COLAS CZ, a.s. bought the company Silnice Žáček s.r.o.
- Merger of the company Silnice Horšovský Týn a.s. to COLAS CZ, a.s.
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