The Burrow is a wizard house, owned by the Weasley family. It's at least four stories tall, built so crazily that it must certainly be held up by magic. It's located outside of the village of Ottery St. Catchpole, but so well hidden that the postman may not even know where it is. It has a ghoul in the attic and gnomes in the garden.

Unplottable and hidden away behind a Fidelius Charm, between two shabby London Muggle houses, is number twelve Grimmauld Place. This is the family home of the Noble and Most Ancient House of Black, one of the most prominent pure-blood wizarding families. The house is derelict, a ruin of its former self.

It is now the headquarters of the Order of the Phoenix.

It stood on a hill overlooking the village, some of its windows boarded, tiles missing from its roof, and ivy spreading unchecked over its face. Once a fine-looking manor, and easily the largest and grandest building for miles around, the Riddle House was now damp, derelict, and unoccupied.

It may look unoccupied but it is the headquarters of the Death Eaters and the leader Lord Voldemort (AKA Tom Marvolo Riddle)

A deserted labyrinth of brick houses leads to a street with a towering mill chimney, which seems to hover like a giant admonitory finger. The very last house on the street belongs to Severus Snape.