The home appraisal is the moment of truth in a real estate transaction. After weeks of house hunting, negotiation, and inspection, an independent professional walks through the property and assigns it a dollar value. If the appraisal comes in at or above the purchase price, the deal moves forward. If it comes in low, the deal can stall, renegotiate, or collapse entirely—costing buyers their earnest money, sellers a sale, and agents their commission.
Understanding how appraisers actually work, what they look for, and what to do when the number comes in low is one of the most useful pieces of knowledge a buyer, seller, or homeowner can have. This guide takes you behind the scenes of the appraisal process with the specifics that matter.
What an appraisal actually is (and isn't)
An appraisal is a professional, independent opinion of a property's market value as of a specific date, performed by a licensed or certified appraiser. Lenders require appraisals on most purchase and refinance transactions to confirm that the collateral supports the loan. Appraisals differ from inspections in important ways:
| Feature | Appraisal | Inspection |
|---|---|---|
| Purpose | Estimate market value | Identify defects and condition |
| Required by | Lender | Buyer (optional but recommended) |
| Typical cost | $300–$500 | $400–$600 |
| Time on site | 15–45 minutes | 2–4 hours |
| Output | Single appraised value | Detailed condition report |
| Licensed professional | State-licensed appraiser | State-licensed inspector |
An appraiser focuses on what the home is worth; an inspector focuses on what's wrong with it. The appraiser notes condition only as it affects value. A $10,000 roof problem might reduce appraised value by $10,000—or it might not move the number at all if comparable sales had similar issues.
The three appraisal approaches
Appraisers use three methodologies to value real estate. The weight given to each depends on the property type.
Sales Comparison Approach
This is the primary method for residential property. The appraiser identifies 3–6 recently sold comparable properties (comps) within the last 3–6 months, ideally within 0.5 miles, similar in size and style. They then adjust each comp for differences from the subject property—add for an extra bathroom, subtract for a smaller lot, add for a renovated kitchen, subtract for being on a busier street.
Adjustments are based on market data, not replacement cost. A new roof might add $8,000–$15,000 in value; a kitchen renovation might add $15,000–$40,000 depending on quality. After adjustments, the appraiser reconciles the adjusted comp prices into a single opinion of value for the subject property.
Cost Approach
The cost approach estimates value as the cost to acquire land and construct an equivalent building, minus depreciation. Formula: Land value + Replacement cost of improvements − Depreciation = Value. This method gets more weight on new construction, unique properties, and special-purpose buildings (churches, schools) where comparable sales are scarce. For most existing homes, it's a secondary check on the sales comparison approach.
Income Approach
For 2–4 unit residential and commercial properties, the income approach capitalizes the property's net operating income into a value estimate. A duplex renting for $3,000/month with $12,000/year in expenses generates $24,000 in net operating income. At an 8% market cap rate, that's a $300,000 value. The income approach gets more weight for investment properties and very little for owner-occupied single-family homes.
What appraisers look for, inside and out
During a typical appraisal inspection (15–45 minutes for a single-family home), the appraiser documents dozens of property characteristics that drive value.
Exterior
- Lot size and shape—measured from county records, confirmed visually
- Home size (gross living area)—above-grade finished square footage
- Bedroom and bathroom count—only above-grade rooms count
- Construction quality and condition—rated C1 (new) to C6 (severely damaged)
- Roof age and condition—estimated remaining life
- Exterior materials—vinyl, brick, stucco, wood siding
- Garage or carport—attached, detached, size
- Patios, decks, porches—measured and noted
- View, topography, water features—significant value drivers
Interior
- Room count and layout—floor plan sketch
- Condition of finishes—flooring, paint, fixtures
- Kitchen and bath updates—age and quality of cabinets, counters, appliances
- HVAC, electrical, plumbing—age and apparent condition
- Basement—finished vs. unfinished, walkout vs. standard
- Safety features—smoke detectors, handrails, GFCI outlets
- Signs of deferred maintenance—water stains, cracks, settling
Appraisers also photograph every room and the exterior from multiple angles—these photos are required by Fannie Mae and Freddie Mac for loans sold to them. Anything visible in the photos (clutter, damage, unfinished projects) affects the appraisal.
How appraisers select and adjust comps
Comp selection is the heart of the appraisal—and the source of most disputes. Appraisers search the MLS for sales within the last 3–6 months, ideally within 0.5 miles, similar in size (within 25% of GLA), age (within 10–20 years), style, and condition. In active markets, finding good comps is easy. In rural areas or for unique homes, appraisers may go back 12 months, expand the radius to 5+ miles, or use older sales with time adjustments.
Once selected, each comp is adjusted to match the subject property. Typical adjustments:
| Feature Difference | Typical Adjustment |
|---|---|
| Extra full bathroom | $5,000–$12,000 |
| Extra bedroom (above 3) | $5,000–$10,000 |
| Finished basement (per sq ft) | $20–$50 |
| Pool (in-ground) | $10,000–$30,000 |
| Garage (per stall) | $5,000–$10,000 |
| Lot size (per acre over baseline) | $5,000–$30,000 |
| Updated kitchen | $10,000–$30,000 |
| View (water, city, mountains) | $10,000–$100,000+ |
Adjustments are market-specific. A bathroom in Manhattan adds more value than the same bathroom in rural Kansas. Appraisers derive adjustment amounts from matched-pairs analysis: comparing two otherwise identical sales where the only difference is the feature in question.
The appraisal timeline and what to expect
After your lender orders the appraisal (typically within 3–5 days of contract acceptance), the process looks like this:
- Scheduling (1–5 days)—the appraisal management company (AMC) assigns an appraiser, who contacts the homeowner or listing agent to schedule access.
- Inspection (15–60 minutes)—the appraiser visits the property, measures, photographs, and takes notes.
- Research and report (3–7 days)—the appraiser pulls comps, makes adjustments, writes the report, and submits it to the AMC.
- Quality control (1–3 days)—the AMC reviews the report for compliance with Fannie Mae/Freddie Mac guidelines.
- Delivery to lender (1–2 days)—the lender receives the report and shares a copy with the buyer within 3 business days.
Total timeline: 7–15 days from order to delivery. Rush appraisals can be done in 5–7 days for an additional fee. New construction, complex properties, and rural homes take longer.
How to prepare for an appraisal
Whether you're the seller preparing for a buyer's appraisal, or the homeowner ordering an appraisal to remove PMI, preparation affects the number. Appraisers are human—small cues matter.
- Clean and declutter—a tidy home reads as well-maintained
- Complete minor repairs—leaky faucets, broken light fixtures, missing handrails
- Make a list of improvements—roof, HVAC, kitchen, baths with dates and costs
- Provide a plot survey—helps the appraiser verify lot size
- List recent comparable sales—your agent can pull these; the appraiser can't always find every relevant comp
- Document unpermitted improvements—don't hide them; unpermitted space is valued lower but concealment creates risk
- Provide rental income documentation for multi-unit properties
Do not follow the appraiser around narrating every feature—most find it annoying and unprofessional. Hand them the improvement list at the start, then let them work.
What to do when the appraisal comes in low
A low appraisal—below the agreed purchase price—happens in roughly 8–12% of transactions, more often in rising or falling markets. You have four options:
Option 1: Renegotiate the price
The seller can agree to lower the price to the appraised value. This is the cleanest outcome for the buyer. Sellers often resist, but if the appraisal was solid, the buyer has leverage: a low appraisal will follow the deal to any other conventional buyer. Sellers who refuse to renegotiate risk losing the deal and re-listing with a stale appraisal on record.
Option 2: Make up the difference in cash
If the appraisal is $10,000 below the contract price and you really want the home, you can bring an extra $10,000 to closing. The lender only finances up to the appraised value; you cover the gap. This makes sense only if you believe the appraisal was wrong and the home is genuinely worth the higher price.
Option 3: Meet in the middle
Buyer and seller split the difference—seller drops price $5,000, buyer brings $5,000 extra cash. This is the most common resolution and often the fastest.
Option 4: Walk away
If you have an appraisal contingency in your contract (most do), you can cancel and recover your earnest money. This is the right move when the appraisal revealed something fundamental—overpayment in a softening market, or property issues you didn't catch during inspection.
Option 5: Challenge the appraisal
If you believe the appraisal was flawed—wrong comps, missed features, factual errors—your lender can submit a Reconsideration of Value (ROV) with corrected comp data. Success rates are 15–30%, so it's worth a try when you have evidence. Your agent's job is to assemble the best challenge: better comps, proof of improvements, photos, or corrections to factual errors in the report.
Reviewing the appraisal report
Once you receive the appraisal (your lender must provide a copy within three business days of receiving it), review it carefully. Common errors that affect value include incorrect square footage, wrong bedroom or bathroom count, missed features (finished basement, deck, garage), and inappropriate comparable sales. If you spot factual errors, your lender can submit a Reconsideration of Value with corrected information.
Pay attention to the appraiser's condition rating (C1–C6) and quality rating (Q1–Q6). A rating of C4 or lower signals deferred maintenance and may trigger lender repair conditions. Compare the comps the appraiser used to recent sales your agent identified—sometimes better comps exist that the appraiser missed, especially in neighborhoods with limited MLS activity or off-market transactions.
Common mistakes to avoid
- Skipping the appraisal contingency. Waiving this contingency is sometimes used to make offers more competitive, but it's a high-stakes gamble. Without it, you must close even if the appraisal comes in low—or lose your earnest money.
- Assuming the appraisal equals market value. Appraisals are opinions, not facts. Two appraisers can value the same home 3–5% apart. For a fuller picture, see our home value estimation guide.
- Over-improving for the neighborhood. A $100,000 kitchen renovation in a neighborhood of $300,000 homes will not add $100,000 in appraised value. Appraisers adjust based on what buyers actually pay for improvements, not their cost.
- Hiding problems from the appraiser. Concealing a foundation crack or water damage doesn't make it disappear. If the buyer's inspector finds it later, you're back in renegotiation—or court.
- Letting the appraiser leave without context. Hand them a list of improvements and recent comps. A prepared information packet can prevent a low appraisal from inexperience.
- Ignoring the appraisal's effect on PMI. If you ordered an appraisal to remove PMI, the appraiser needs to know your goal. They may not be able to change methodology, but they should know the threshold they're working toward. See our PMI removal guide for more.
Frequently asked questions
Who pays for the appraisal?
The buyer pays, either up front or at closing. The fee ($300–$500 for typical single-family homes) appears on the Loan Estimate and Closing Disclosure. If the deal falls through, the appraisal fee is non-refundable—you're paying for the work performed, not a successful transaction.
Can I use the appraisal for anything besides the loan?
Yes. The appraisal is a snapshot of value as of the inspection date. It can support a property tax appeal (if the appraised value is below the assessor's), an estate valuation, a divorce settlement, or a PMI removal request—though lenders often require their own appraisal ordered through their AMC for PMI removal.
How long is an appraisal valid?
Lenders typically consider an appraisal valid for 4–6 months. After that, the lender may order an appraisal review or a new appraisal. Markets can shift significantly in six months—what was true in March may not be in October.
What's the difference between an appraisal and a CMA?
An appraisal is performed by a licensed appraiser using standardized methodology and is accepted by lenders. A Comparative Market Analysis (CMA) is prepared by a real estate agent, is less rigorous, and is used for listing strategy, not lending. CMAs are free; appraisals cost money.
Can I get a copy of my appraisal?
Yes. Federal law requires lenders to provide a copy of the appraisal report to the borrower within three business days of receiving it—at no additional cost. Review it carefully; errors are common and correctable.