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.
Vejle lies in a valley, with steep drives and older houses up the hill. That affects scaffolding, delivery of materials, and time on a roof or a facade. The same 4 businesses as the Danish page: Enghave VVS, J H Smed & VVS v/Johannes Holm, Skovsende VVS og industrimontage ApS, VVS-INSTALLATØR KAJ HANSEN ApS.