1936:

Foundation of the Road Construction Company "Ing. Hellmuth SWIETELSKY" in Gmunden. Initial activities are road construction and paving.

1937:

Relocation to Linz.

1965:

Senator DI. Hellmuth SWIETELSKY is elected "Man of the Year" by the International Road Federation, Washington D.C.

1974:

Authorisation for the central laboratory in St. Martin to operate as "state-authorised material testing laboratory". Project oversight in Mauretania, Camerun and the former USSR earned the laboratory international reputation.

1975:

Founding of "Hoch-Tief-Bau Imst" (structural-civil and underground-engineering construction company) and awarding of the "National Coat of Arms".

1987:

Change of legal corporate structure to SWIETELSKY Baugesellschaft m.b.H. (Swietelsky Construction Company Ltd.)

1989:

In the following 10 years subsidiaries are founded in Hungary, the Czech Republic, Slovakia, Slovenia and Croatia.

2000:

Founding of subsisidiary in Poland. On March 8th, 2000, SWIETELSKY Bauges.m.b.H. receives the quality management certificate acc. to EN ISO 9001 : 2000.

2001 to 2005:

Purchase of 100 % shares of further construction companies such as

• Bmstr. Karl Sedlmayer
• Kallinger Bau GmbH
• C. Peters Baugesellschaft m.b.H.
• Ing. Rudolf Seibt Gleisbau GmbH
• Stollen- und Tunnelbau Ast-Holzmann (Swietelsky Tunnelbau GmbH & Co KG)
• Ast-Holzmann Tirol Baugesellschaft m.b.H. (A.S.T. Baugesellschaft m.b.H.)
• Jos. Ertl GmbH
• Wadle Bauunternehmung
• Georg Feßl GmbH

2005:

New majority ratio due to change in shares of existing holder structure.

2006:

Founding of SWIETELSKY d.o.o. Beograd.