She is licensed for the restoration of XVII-XIX century stained glass of historical importance.

Dolores Hoffmann has taken practical courses in stained glass at Vilnius (Lithuania) and Lion (France). She has had one-artist expositions in Estonia, Finland, Germany, France, Denmark and Russia.

In 1993 Dolores Hoffmann was awarded the Grand Prix in the International contest exhibition held in Lion, France. In 2002 she received the Honour Medal of Mary from the Dome Cathedral in Tallinn, Estonia.

Major stained glass works for architectural projects:

1975–1983  Valjala and Kihelkonna Churches on the Estonian island of Saaremaa;
1975  Estonian Ministry of the Environment building;
1980  Tallinn TV tower, Estonia;
1983  Central Marriage Registry office, Tallinn, Estonia;
1984  Hotel Leningrad, in St. Petersburg, Russia;
1987-1996  Church of the Holy Spirit, Tallinn, Estonia;
1989  Tallinn's Telephone Company, Estonia;
1995–1999  Türi and Toila Churches, Estonia;
1995–1997  Hakunila Church in Helsinki, Finland;
1996  Opus Dei Chapel, Stockholm, Sweden;
2000  Lukoil Company, Moscow, Russia;
2000  Nõmme Baptist Church, Tallinn, Estonia;
2001  Synagogue in Tallinn, Estonia;
2001  Talosto Company, St. Petersburg, Russia;
2001  Karula Church, Estonia;
2002  Dome Cathedral, Tallinn, Estonia;
2003  Heimtali Church, Estonia;
2003  Metropolitan Stephanus Residence in Tallinn, Estonia;
2004  Narva Church, Estonia;
2004  St. Anna Children’s Church, Finland;
2005, 2009, 2011  Simuna Church , Estonia;
2006  Laiuse Church, Estonia;
2006  Mustvee Baptist Church, Estonia;
2008  Muuga Chapel, Tallinn, Estonia;
2008  Kohila Baptist Church, Estonia;
2008  Estonian Orthodox Church, Tallinn;
2009  Nissi parish house, Estonia;
2010–2012  Different public buildings in Batumi, Georgia;
2012  Põltsamaa Church, Estonia;
         Haapsalu Ortodox Church, Estonia;
         Haapsalu Methodist Church, Estonia.