Is Zakat obligatory on timber used in construction that is replenished? Is Zakat obligatory on saved money that has reached the Nisab after a period of time? What is the ruling on Zakat for debts owed to them in the market, including those that are uncollectible? Is Zakat obligatory on a rented house they do not live in, which has a shop and a valley?

The wood used in the work is not subject to zakat because it is not merchandise for trade. Zakat is obligatory on cash funds if each individual's share reaches the nisab by itself, or by combining it with cash they own, merchandise for trade, and debts that are expected to be repaid, and a hawl (one lunar year) has passed on it. The nisab is equivalent to 85 grams of gold or 595 grams of silver. Debts are added to the principal when calculating the nisab. Debts that are not expected to be repaid are not calculated, and zakat is paid on them for one year when they are collected. Zakat is not obligatory on real estate not intended for sale. Rent is subject to zakat if a hawl has passed on it and it reaches the nisab by itself or by what is added to it.