Leviticus 27:8

27:8 If he is too poor to pay the conversion value, he must stand the person before the priest and the priest will establish his conversion value; according to what the man who made the vow can afford, the priest will establish his conversion value.

Leviticus 27:14

Redemption of Vowed Houses

27:14 “‘If a man consecrates his house as holy to the Lord, the priest will establish its conversion value, whether good or bad. Just as the priest establishes its conversion value, thus it will stand.