Work on fixed water and heating installations needs an autoriseret VVS-installatør (authorised plumbing contractor), or a firm that brings one. Ask which it is, and ask for that on the invoice (faktura). Authorisations are looked up at Sikkerhedsstyrelsen, sik.dk.
Holstebro is houses and business premises. Outdoor work follows the season. Roofs and facades are often booked early in spring. The same 2 businesses as the Danish page: Bøndergaard A/S, Mogensen VVS Comfort A/S.