A starting point for estimating your loan amount:
Let's assume this is a rehab deal - either a single family or a small multi
Take the ARV (After Repaired Value) based on SOLD comps with 3 months and a small local area (1/4 mile max in a city, 1/2 mile in a suburb, more in rural areas) less 10% for quick sale value X 60%. This is your max loan amount.
Back out your repair budget (we fund 100% of rehab budget) and the amount left is what is loaned to you at acquisition, unless it is more than the purchase price. Then you still have to put a minimum of 10% cash down, sometimes more.
(ARV X 90%) X 60% - Rehab cost = Max loan at purchase
Rehab is usually funded 100% on top of the max loan at purchase
Example 300,000 ARV, 150,000 purchase price, 30,000 rehab budget
300,000 X 90% = 270,000 quick sale value
270,000 x 60% = 162,000 max loan amount
162,000 - 30,000 = 132,000
30,000 rehab funded in draws in arrears of construction
132,000 OR LESS funded at acquisition
At closing the borrower brings $18,000 plus points plus closing costs, plus funds the start of construction until the first draw