Planning applications in the UK are publicly available and many have architectural drawings/site plans attached with varying degrees of detail.
There are millions of applications and each local authority has a different database so it may take a bit of digging to find what you are searching for.
Same in Denmark, you can either look them up on https://weblager.dk or if a house you interested in isn't available there you can normally request the drawing from the city, for a small fee.