Concept
Appraisal
What it is
An appraisal is a licensed professional’s written opinion of a property’s market value on a given date. Lenders require it on almost every purchase and refinance because the loan is based on value, not on whatever buyer and seller agreed to. For single-family homes, appraisers use three methods: the income approach (net operating income, used more on multifamily), the cost approach (what it would cost to rebuild from scratch), and the sales comparison approach — comps. Sales comparison is the right one for single-family and the one that matters for flippers.
The Zestimate and every other automated valuation model is NOT an appraisal. ChatGPT without training will try to average AVMs and call it an ARV. That’s not what you want.
Why it matters
Appraisals are where deals die at the finish line. Contract signed, rehab done, everything is clean, appraiser comes back $15K light. Now the buyer has to bring extra cash, renegotiate, or walk. Low appraisals are common enough to plan for — not the exception.
The appraiser’s report also drives arv at refi. When Ross comps a property for acquisition, he’s effectively running an amateur appraisal on himself. Get it wrong and every dollar of the mistake comes out of profit.
One important note: the appraiser is trying to find the right number, but their data isn’t always better than a careful investor’s own comp work. Always use sold comps — not pending, not listed. A house sitting at $225K for 90 days is not a comp. It’s proof the ARV is below $225K.
How it shows up
The Appraiser Lockbox Trick: remove the key from the lockbox on appraisal day. When the appraiser calls asking how to get in, bring the key personally and walk them through. Point out the work done, hand them a one-page sheet of your best comps with a short explanation, answer questions. This isn’t influence-peddling — it’s making sure the appraiser has the same information you have. They’re usually grateful because it saves them research time.
Prep the house the same way you’d prep for a showing. Lights on, clean smell, every light bulb working, caulking fresh at tub and baseboards. The appraiser is assessing condition, and condition drives a real portion of the final value on cosmetic comparables. A house that shows an 8 out of 10 appraises higher than the same house showing a 6 out of 10, every time.
The big three filter applies to appraisers the same way it applies to buyers. A house staged well with a clean hardware package and a thoughtful comp package left on the kitchen counter reads as a top-of-range sale. A house with mismatched finishes and dog hair in the corners reads as middle-of-range. Small amount of prep work, meaningful swing in appraised value, real dollars at closing.