In 1893, he commissioned the firm of Jacob Digre in Trondheim to build his summer residence, Villa Strandheim [nn].

In the 1890s a new school of art arose, and artists like Dahl were not very popular in the leading circles in the capital.

He was severely criticized by fellow artists especially by Christian Krohg, who was one of the leading figures in the transition from romanticism to naturalism which characterized Norwegian art in this period.

Dahl often described the scenery of the western part of Norway in brilliant sunshine with smiling people in national costumes.

His vibrant colors and charming portrayals of young Norwegian girls in their national costume have always been very popular.

Their son was the Norwegian painter Hans Andreas Dahl [de] (1881–1919), who died of tuberculosis at the age of 37.