What's the zoning and regulations around building a house in Sweden? If you're connected to utilities like water/electricity, do you still need a professional to come out and certify everything?

Even if you're totally off-grid, do you still need someone to certify the build and the design itself? Any time I hear of house building in Europe I keep thinking back to that British version of Grand Designs, where there would be the inevitable house builder that would forget to add metal ties between masonry courses or something and end up costing themselves thousands of bucks.