The day before, Marvolo surprised Harry with the revelation of a partially-renovated main wing of the house (the East wing being only for family). Two sections, really. The first, the larger, being a magically isolated section cleaned out to create bedrooms and playrooms and a preschool of sorts for the temporary orphanage. The second, bordering the family wing as a buffer zone, a schoolhouse for Harry and friends complete with an indoor greenhouse, a potions’ lab, and a library slightly larger than the one Hermione spent most of her time in. Apparently he’d worked on it while Harry went to Sirius’s.