The Danish page files these firms under Låsesmed & døre (locksmith and doors). A name here can be a locksmith, a door firm, or both. Ask which job they are pricing, and ask for the CVR number on the invoice.
Helsingør and nearby North Zealand towns such as Hørsholm have older coastal houses and apartments near the station. Salt, wind and older roofs show up on roof and facade jobs. The same 1 businesses as the Danish page: Glarmesterfirmaet J. Jensen & Søn A/S.