Leviticus 27:13-15

13If the one who brought it decides to redeem it, he must add a fifth to the assessed value.

14“When a man consecrates his house as holy to the Lord, the priest will assess its value, whether high or low. The price will stand just as the priest assesses it.

15But if the one who consecrated his house redeems it, he must add a fifth to the assessed value, and it will be his.