Andreas Nilsen Grenstad (1821-1895) was a Norwegian architect who was best known for the churches that he designed.
[1] Grenstad was born on the Grendstad farm in what was Klæbu Municipality in Søndre Trøndhjems county in 1821.
[1] In 1951 during the restoration work of Valberg Church, a letter was found under the floor that was written by Grenstad.
It read: "This church is built by Andreas Grenstad from Vefsn, Mosjøen, in the year of 1888, when it also was finished.
His first name varies as well with spellings of Andreas, Anders, or Nils (a short form of his patronymic name).