How Home Appraisals Work: A Refinancing Homeowner's Guide to Comparable Sales, Adjustment Factors & Disputing Low Valuations
How Home Appraisals Work When You’re Refinancing
If you’re planning to refinance your mortgage, a home appraisal is one of the most critical steps in the process. The appraised value of your home directly determines your loan-to-value (LTV) ratio, which affects your interest rate, whether you qualify for the refinance at all, and whether you can eliminate private mortgage insurance (PMI). Understanding how the appraisal process works—especially how comparable sales are analyzed and adjustments are applied—puts you in a stronger position to protect your home’s value.
What Is a Home Appraisal?
A home appraisal is an independent, professional assessment of your property’s market value conducted by a licensed appraiser. During a refinance, the lender orders the appraisal to confirm that the home provides sufficient collateral for the new loan amount. Unlike a home inspection, which focuses on the condition of structural and mechanical systems, an appraisal focuses exclusively on determining fair market value as of a specific date.
Who Pays for the Appraisal?
The homeowner typically pays the appraisal fee, which ranges from $350 to $600 for a single-family home depending on location, property size, and complexity. The fee is usually collected at the time the refinance application is submitted or at closing.
The Appraisal Process: Step by Step
- Lender orders the appraisal: After you apply for the refinance, the lender engages an appraisal management company (AMC) or an independent appraiser. Federal regulations prevent lenders from selecting appraisers directly to ensure objectivity.- Property inspection: The appraiser visits your home, typically spending 30 to 60 minutes measuring the property, photographing interior and exterior features, noting the condition, and documenting any upgrades or deficiencies.- Comparable sales research: The appraiser researches recent sales of similar homes in your area to establish a baseline value. This is the most influential component of the appraisal.- Adjustments are applied: Because no two properties are identical, the appraiser makes dollar-value adjustments to each comparable sale to account for differences in features, size, condition, and location.- Final value opinion: The appraiser reconciles the adjusted comparable values and arrives at a single opinion of market value, which is documented in the Uniform Residential Appraisal Report (URAR, Form 1004).- Report delivered to lender: The completed report is sent to the lender, who shares it with you. By federal law, you’re entitled to receive a copy at least three business days before closing.
How Comparable Sales Analysis Works
Comparable sales—commonly called “comps”—are the foundation of a residential appraisal. Appraisers typically select three to six recent sales that are similar to the subject property. The ideal comp meets these criteria:
- Sold within the last 90 days (up to six months is acceptable; beyond that requires justification)- Located within one mile of the subject in urban areas or within five miles in rural areas- Similar in size, style, age, and bedroom/bathroom count- Sold under normal market conditions (not foreclosures, short sales, or family transfers unless those reflect the local market)
Understanding Adjustment Factors
Because perfect comps rarely exist, appraisers apply adjustments. The rule is simple: if a comp has a feature the subject lacks, the appraiser subtracts value from the comp; if the subject has a feature the comp lacks, the appraiser adds value to the comp. This brings each comp in line with the subject property.
| Feature | Typical Adjustment Range | Direction |
|---|---|---|
| Square footage | $20–$80 per sq ft | Added or subtracted per difference |
| Extra bedroom | $5,000–$15,000 | Added if subject has more |
| Extra bathroom | $5,000–$12,000 | Added if subject has more |
| Garage (2-car vs. none) | $8,000–$20,000 | Added if subject has garage |
| Updated kitchen | $10,000–$25,000 | Added if subject is updated |
| Pool | $5,000–$15,000 | Market-dependent |
| Lot size (per acre) | $5,000–$30,000 | Varies by location |
| Age/condition | $5,000–$20,000 | Adjusted for superior or inferior condition |
| Location/proximity | Percentage-based (1%–10%) | Based on neighborhood desirability |
What to Do If Your Appraisal Comes in Low
A low appraisal can derail your refinance by pushing your LTV too high. Fortunately, you have options to dispute or address the situation.
Steps to Dispute a Low Appraisal
- Review the report carefully: Check for factual errors—wrong square footage, incorrect bedroom count, missing upgrades, or an inaccurate description of condition. These mistakes are more common than you might expect.- Gather your own comps: Research recent sales in your area through your county assessor’s website, MLS data (ask a real estate agent for help), or platforms like Zillow and Redfin. Identify sales that are more comparable or more recent than those the appraiser used.- Document improvements: Compile receipts, permits, and before-and-after photos for any renovations or upgrades completed since purchase. Quantify the investment and the value those improvements add.- Submit a Reconsideration of Value (ROV): Write a formal letter to your lender requesting a review. Include the specific errors you found, your alternative comps with supporting data, and documentation of improvements. Be factual and professional—emotional arguments are not persuasive.- Request a second appraisal: If the ROV is denied and you believe the valuation is materially incorrect, ask the lender if a second appraisal is possible. Some lenders allow this at the borrower’s expense. Under certain guidelines, a second opinion may carry weight if it uses superior comps.- Switch lenders: As a last resort, you may apply with a different lender, which will order a new independent appraisal. However, this restarts the process and incurs additional costs.
Tips to Prepare Your Home Before the Appraisal
- Complete minor repairs—fix leaky faucets, patch walls, replace broken fixtures- Improve curb appeal with landscaping, a clean exterior, and a tidy yard- Prepare a list of all improvements with dates and costs- Ensure all areas of the home are accessible for inspection- Keep the home clean and decluttered so the appraiser can see finishes and spaces clearly
Frequently Asked Questions
Can I attend the home appraisal during a refinance?
Yes, homeowners are generally allowed to be present during the appraisal. While you should not attempt to influence the appraiser’s opinion, being available to answer questions about upgrades, maintenance history, and the neighborhood can be helpful. Prepare a written summary of improvements to hand to the appraiser so nothing is overlooked.
How long does a refinance appraisal take, and how long is it valid?
The on-site inspection typically takes 30 to 60 minutes. The completed report is usually delivered to the lender within 5 to 10 business days. Most appraisals are valid for 120 days from the effective date of the report. If your refinance takes longer than that, the lender may require an appraisal update or a new appraisal altogether.
What happens if my appraisal comes in higher than expected?
A higher-than-expected appraisal is beneficial for refinancing. It lowers your loan-to-value ratio, which can help you secure a better interest rate, qualify for a larger cash-out amount, or eliminate PMI. You are under no obligation to borrow more just because the appraised value is higher—the extra equity simply works in your favor during negotiations with the lender.