How Appraisals Work and Why a Low One Can Derail Your Purchase

What the Appraisal Process Actually Looks Like

Once you're under contract, your lender selects a licensed, independent appraiser — typically through an appraisal management company — to evaluate the property. The appraiser visits the home, measures its square footage, notes the number of bedrooms and bathrooms, assesses condition, and documents key features. The physical visit usually takes 30 minutes to a few hours depending on property size.

After the visit, the appraiser identifies recent comparable sales ("comps") — homes with similar characteristics that sold nearby, usually within the past six months. They adjust the home's estimated value up or down based on differences between the subject property and each comp. The result is a written appraisal report delivered to the lender, which buyers can request a copy of.

Turnaround time varies by market and appraiser availability, but most appraisals are completed within one to two weeks of the inspection date. Delays are more common in rural areas or during high-volume purchase seasons.

Why a Low Appraisal Creates a Problem

A lender will only extend financing up to the appraised value of the home — not the purchase price. So if you've agreed to pay $420,000 but the appraisal comes in at $400,000, your lender treats $400,000 as the property's value for loan purposes. The $20,000 gap doesn't disappear; someone has to account for it.

This is where many transactions get complicated. If you're financing 90% of the purchase price with a conventional loan, you're already expected to bring a down payment. A low appraisal means you may need to bring additional cash to close — or renegotiate. Sellers who priced aggressively in a hot market may have difficulty accepting a lower price, especially if they've already made plans based on that figure.

Understanding how negotiating dynamics shift during the transaction can help you approach an appraisal gap conversation more strategically.

Your Options When the Numbers Don't Match

A low appraisal doesn't automatically end the deal. Buyers and sellers typically have four paths forward:

• Renegotiate the purchase price: The most straightforward resolution. The seller agrees to lower the price to match the appraised value, and the loan proceeds as planned.
• Cover the gap in cash: If you have the liquidity, you can pay the difference between the appraised value and the purchase price out of pocket. This is increasingly common in competitive markets where buyers waive the appraisal contingency.
• Challenge the appraisal: Your agent can submit a formal reconsideration of value with additional comparable sales the appraiser may not have used. The appraiser reviews the data and may revise the figure — though there's no guarantee.
• Walk away: If your contract includes an appraisal contingency, you can exit the deal and recover your earnest money deposit. This is why including that contingency matters, as noted in our discussion of what sellers evaluate in offers.

If you're buying a fixer-upper, the appraisal picture is even more complex — the real trade-offs of distressed properties include appraisal challenges tied to condition and comp availability.

How to Protect Yourself Before the Appraisal

Buyers can't control the appraiser's conclusions, but they can take steps to reduce risk. Before making an offer, ask your agent to run a comparable sales analysis — the same basic exercise an appraiser will perform. If the agreed price looks significantly higher than recent comps support, a low appraisal becomes a real possibility.

Including an appraisal contingency in your purchase contract is one of the most straightforward protections available, though it can weaken your offer in highly competitive situations. For deeper insight into how contract terms affect your standing, see our guide on negotiating after the inspection.

Finally, review the appraisal report carefully once you receive it. Errors in square footage, bedroom count, or comp selection do occur. A knowledgeable agent can identify whether a reconsideration request is worth pursuing based on the specific comparables used.

This article is for general informational and educational purposes only. It does not constitute financial, legal, or real estate advice. Consult a licensed real estate professional or attorney for guidance specific to your situation.