ADDITION TO STOCK EXCHANGE RELEASE: YIT ACQUIRES CAVERION, A CENTRAL EUROPEAN COMPANY OFFERING TECHNICAL BUILDING SYSTEM SERVICES

| Source: YIT YIT 

YIT CORPORATION        STOCK EXCHANGE RELEASE       JUNE 23, 2010 AT 13.15      


ADDITION TO STOCK EXCHANGE RELEASE: YIT ACQUIRES CAVERION, A CENTRAL EUROPEAN   
COMPANY OFFERING TECHNICAL BUILDING SYSTEM SERVICES                             

YIT Corporation has today June 23, 2010 at 9.45 published a stock exchange      
release announcing that YIT Corporation has agreed with the owners of Caverion  
GmbH that YIT will acquire the entire business of Caverion.                     

YIT makes the following addition to the stock exchange release: The operating   
profit of Caverion GmbH has been about 2 per cent of the revenue and the company
has a solid financial position.                                                 


YIT Corporation                                                                 


Virva Salmivaara                                                                
Senior Vice President, Corporate Communications                                 


For further information, please contact:                                        
Arne Malonæs, President of Building and Industrial Services segment, tel. +47 90
69 31 86, arne.malonas@yit.no                                                   
Sakari Toikkanen, Senior Vice President, Business Development, tel. +358 40 532 
2174, sakari.toikkanen@yit.fi                                                   
Hanna-Maria Heikkinen, Vice President, Investor Relations, tel. +358 40 826     
2172, hanna-maria.heikkinen@yit.fi