I found these houses in the town of Scalloway in Shetland. Very many old houses in the Scottish islands are built in stone, and have kept the colours of the stone. Since the doors are wooden, that is where they use the colour. Not so here in Scalloway.
Scalloway was the capital of Shetland before Lerwick and during WW2 it was the base of the Shetland Bus, a fishing vessel operation helping Norwegians to escape from occupied Norway to Shetland. In Scalloway you should visit the museum for the Shetland Bus.