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 Stained glasses windows for Valjala and Kihelkonna Churches on the Estonian island of Saaremaa;

1975 Stained glass for the Estonian Ministry of the Environment building;

1980 Stained glass windows for the Tallinn TV tower, Estonia;

1983 Stained glass windows for the Central Marriage Registry office, Tallinn, Estonia;

1984 Stained glass windows for the Hotel St. Petersburg, in St. Petersburg, Russia;

1987-1996 Stained glasses windows for the Church of the Holy Spirit, Tallinn, Estonia;

1989 Stained glasses windows for the Telephone Company, Tallinn, Estonia;

1995-1999 Stained glasses windows for Türi and Toila Churches, Estonia;

1995-1997 Stained glasses windows for the Hakunila Church of Helsinki, Finland;

1996 Stained glass windows for the Opus Dei Chapel, Stockholm, Sweden;

2000 Two stained glass domes and windows for Lukoil Company, Moscow, Russia;

2000 Stained glass windows for the altar of Nõmme Baptist Church, Tallinn, Estonia;

2001 Stained glass windows for the Synagogue in Tallinn, Estonia;

2001 Stained glass windows for the Talosto Company, St. Petersburg, Russia;

2001 Stained glass windows for the altar of Karula Church, Estonia;

2002 Stained glass windows for the vestry of the Dome Cathedral, Tallinn, Estonia;

2003 Stained glass windows for the Heimtali Church of Võrumaa, Estonia;

2003 Stained glass windows for the Metropolitan Chapel Stephanus in Tallinn, Estonia;

2004 Stained glass windows for the Narva Church, Estonia;

2004 Stained glass windows for the St. Anna Children’s Church, Finland;

2005 Restoration of Tallinn Dome Church windows;

2005 Stained glass rose-window for the Church of Simuna;

2006 Stained glass altar-window for the Church of Laiuse;

2006 Stained glass windows for Mustvee Baptist Church;

2008 Stained glass windows for Muuga Chapel;

2008 Stained glass window for Kohila Baptist Church;

2008 Two windows for Estonian Orthodox Church;

2009 Side-window for the Simuna Church;

2009 Stained glass windows for the Nissi parish house.