Editor's Note: This article has been updated to better capture the nuance of the real estate appraisal process. We have refined the headline and text to ensure the mechanics of market data lag and strict lender guidelines are clearly understood and not misinterpreted.
In San Francisco's white-hot housing market, winning a bidding war is starting to feel like the easy part. The real trouble shows up later, in the form of an appraisal gap. With single-family asking prices jumping into the seven-figure range, lenders and appraisers are bound to closed-sale data that can be weeks or months old. When the appraised value—which is based on proven market data rather than a speculative offer—lands below the contract price, the loan amount becomes the ceiling. Suddenly, buyers are scrambling to plug the gap with cash, renegotiate the deal, or walk away after putting down hefty deposits.
Appraisers say there isn't enough recent data
Parker Jones, a 25‑year San Francisco appraiser, told The San Francisco Standard that appraisers are trying to support those prices but sometimes find zero closed data to work with when values jump quickly. Without fresh, closed comparables, appraisers and lenders cannot justify loan amounts for contracts written at brand-new price points that the historical data has not caught up to yet.
Prices have surged, shrinking the pool of usable comps
Market reports echo the squeeze. Compass-linked coverage and local data show median San Francisco home prices hovering near $1.7 million, along with a sharp drop in active listings. Fewer homes for sale means fewer recent closed transactions for appraisers to use as comparable sales. As analyzed by Redfin, pending sales and bidding intensity have climbed while inventory has fallen, especially for single-family homes.
When closed data lags, appraisal gaps emerge
The result is that deals can unravel as soon as the appraisal report is finalized. The San Francisco Standard documented transactions where the appraised value came in hundreds of thousands below the contract price. One deal reportedly saw a $150,000 gap, and a buyer in another case walked away rather than close and lose a $50,000 deposit. In this kind of market, lower all-cash offers routinely beat out buyers who rely on financing and are tethered to whatever number can be proven by historical data.
Options for buyers and how agents try to bridge the gap
To keep deals alive, agents are increasingly gathering and presenting evidence of the market's direction. That can mean documenting pending offers, sharing competing bid details when possible, and talking directly with appraisers so they see context that has not yet hit public records. If a gap still exists, lenders can request a reconsideration of value, often referred to as an ROV, or order a second appraisal. Industry guidance from Mortgage Research Network shows ROVs succeed less than 25% of the time unless there are clear errors or stronger comparables available. Buyers who cannot cover the difference may push for a lower price, take a short-term bridge or private loan, or even switch lenders - all costly moves, but sometimes the only way to keep a purchase from falling apart.
What underwriting rules still require
Appraisers and lenders are strictly bound by underwriting rules designed to protect lenders from market downturns and speculative bubbles. Guidance from Fannie Mae requires a minimum of three closed comparable sales in the sales-comparison approach, and lender systems flag reports that fail to meet those standards. If buyers want to push prices to the very edge of the market, lenders require the buyers to cover that speculative gap with their own cash rather than the bank taking on the risk.
The one bit of relief is that this is largely a timing issue. As more of today's high-priced contracts close through the spring, appraisers will have fresher comparables to prove the new market baseline, and the most extreme appraisal shortfalls should become less common. Until then, buyers are wise to budget extra contingency cash, ask their agents to document nearby pending sales, and talk with lenders early about ROVs, second appraisals, or bridge financing.
In a market moving this fast, having a sharp agent, an appraiser who understands local bidding dynamics, and a lender willing to move quickly can spell the difference between getting the keys and losing a deposit. Buyers who plan for appraisal gaps from the start are the ones who avoid the nastiest shocks.
