The Price For Redemption of a House (Leviticus 27:14-15).
“And when a man shall sanctify his house to be holy to Yahweh, then the priest shall estimate it, whether it be good or bad. As the priest shall estimate it, so shall it stand. And if he who sanctified it will redeem his house, then he shall add the fifth part of the money of your estimation to it, and it shall be his.”
This is the case where a man vows a house to Yahweh, setting it apart to be holy to Yahweh. He wants Yahweh's special blessing on his house. He wants to be able to say, this house has been dedicated to Yahweh. Then its value will be assessed by the priest. And if the man wishes it back he must pay that price plus one fifth. Then it will be his again with the joy of knowing that it has been dedicated to Yahweh. But the vow is real. If he does not pay the cost the house goes to the priests for them to sell.