La Maison de Montmorency is a three-floor estate and has been owned by three generations of the Montmorency. La Maison de Montmorency also doubles as their business establishment and warehouse (Hence, its size). Due to additions, the house seemed somewhat Frankenstein-like with stairways leading to different parts of the house, doorways opening to other areas, and some rooms being dead ends. It contains 6 bedrooms, 7 bathrooms, 8 powder rooms, 2 laboratories, 2 stock rooms, an office, a greenhouse, an indoor pool, a wine cellar, house elves' quarters, a garage for carriages and broomsticks. They have three house elves with the names Fizzle, Tropius, and Ebb.

It is located in one of the isolated valleys around London's countryside, hidden mostly from Muggles' view. It has a stone fountain near the entrance and its walkway is a combination of gravel and short bushes delicately designed to lead you towards the entrance and around the house.
Residents;
Abélard de Montmorency, Agnes de Montmorency (née Peverell), Garreth Audric de Montmorency , Wilke Thibault de Montmorency , Christoph de Montmorency
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