The Home Appraisal: What It Is For, and What to Do When It Comes In Low

An appraisal exists to protect the lender, not the buyer. The bank is about to lend hundreds of thousands of dollars secured by a house it has never seen, and the appraisal is its independent check that the collateral is worth what the loan assumes. That framing explains everything else about how appraisals behave — including the part buyers find maddening: a house selling for more than the appraised value is not evidence that the appraiser was wrong.

An appraisal is also fundamentally backward-looking. The appraiser's job is to establish value from closed, recorded sales — comparable properties that actually sold, in the recent past, near the subject. Pending sales and current asking prices carry little or no weight, because neither has been tested.

How does the appraiser reach a number?

For a typical single-family home, by sales comparison. The appraiser selects several recently closed sales that are similar in location, size, age, style, and condition, then adjusts each one up or down for differences from the subject property — an extra bathroom, a finished basement, a two-car garage, a busier street. The adjusted comparables converge on a value.

For a condominium, the process is similar but the appraiser also considers the association, and the lender separately reviews the building's financial health. For a multi-family, an income approach may be used alongside the comparison.

The appraiser physically inspects the property, but this is not a home inspection. They are documenting condition, size, and features relevant to value, not evaluating whether the furnace is near the end of its life.

This is why unusual properties appraise unpredictably. If a home has features the neighborhood does not — a very high-end renovation on an ordinary street, an unusual layout, a converted use — there may be no closed comparable sale that reflects it, and the appraiser cannot invent one.

Why do appraisals come in low in a fast market?

Structural lag. When prices are rising quickly and buyers are competing, the sale prices being agreed today are above the sale prices that closed sixty to ninety days ago — and those closed sales are the only data the appraiser is permitted to lean on. A low appraisal in that environment is often not a judgment that the buyer overpaid; it is the arithmetic of a market moving faster than the record.

Low appraisals also follow from bidding wars specifically. If a property draws several competing offers and the winner is meaningfully above the rest, the winning price reflects the intensity of one buyer's preference rather than a broad market consensus — and an appraiser looking for a pattern will not find one.

What are the options when it comes in low?

Four, and only four.

1. The buyer brings the difference in cash. The lender will finance against the appraised value, so the gap has to come from somewhere. On a $50,000 shortfall with 20% down, this is real money on top of an already large down payment — and it is the option that quietly assumes the buyer has it.
2. The seller reduces the price to the appraised value. Sellers resist this, understandably. The counterargument that sometimes lands: the next buyer's lender will very likely order an appraisal that reaches a similar number, so re-listing may reproduce the same problem after weeks of lost time.
3. Split the difference. The most common outcome in practice. Both sides give up something, and the deal survives.
4. Challenge the appraisal — or change lenders. A formal reconsideration of value can be requested, but it needs substance: closed comparable sales the appraiser did not use, or a factual error about the property such as wrong square footage or a missed finished space. Disagreement alone accomplishes nothing. Appraisals are generally portable across lenders within the same loan type only in limited circumstances, so switching lenders to get a new appraisal is slow and not always available.

How do appraisal contingencies change the picture?

Entirely. With an appraisal contingency, a low appraisal gives the buyer a defined right to renegotiate or withdraw with their deposit intact. Without one, the buyer is contractually obligated to close at the agreed price — and must cover the gap in cash or be in breach, forfeiting the deposit.

In competitive Greater Boston bidding, waiving or partially waiving the appraisal contingency is a common way to strengthen an offer. A partial waiver — agreeing to cover a shortfall up to a stated dollar amount — is a genuinely useful middle position: it gives the seller most of the certainty they want while capping the buyer's exposure at a number they have actually decided they can afford.

That decision should be made with a clear head, before you are emotionally committed to a specific house, and with an honest look at your cash reserves after the down payment and closing costs are accounted for.

What can a seller do to support the value?

Be present in the process without being pushy.

• Leave the appraiser a short written list of improvements with dates and costs.
• Provide comparable sales that support the price — appraisers can only consider information given to them.
• Make sure finished square footage is measured correctly, particularly for finished lower levels, which are frequently miscounted.