What does it mean in Leviticus 27:15 to redeem the house?

Answer From The Annual Reading Schedule - Week 30 Notes For Leviticus: Redeeming the house would be a situation where someone vowed to give their house, that house was given for the services of Yahweh, valued at a price by the priest, and later someone wanted it back. To get it back, they would have to "redeem" it. To "redeem" it would mean to buy it back. To buy it back, they would have to pay not only the price that the priest said, but also 20% of that price on top of it (one-fifth = 20%). So if it was valued at 100 sheqels, they would have to pay 120 to get it back.