Your cost basis needs to break down into the cost of what you are selling. For instance, you are obviously not selling the 34 solar panels since you took them off the house and got rid of them.
So add in what you originally paid for the house. Then add in all of the improvements and repairs after the fire. Subtract all of the insurance reimbursement. Then add in any improvements that are still in the house. (The solar water heater doesn't get added in but the regular water heater that replaced it does.)
Tax credits that were offered to you for adding in windows and the like do not reduce your basis. But a rebate would. So if you got any kind of rebate credit from any agency or manufacturer you should deduct that from the basis of the property.
All of those are going to be math that you will do behind the scenes. Save your receipts that prove the value and enter the total as the purchase price of the house. So your improvements are just included as part of that total.
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