To make a first estimate of a rental property’s value, check closed sales, inspect the home and work through its costs. Use your estimate to decide whether to take a closer look or make an offer. It is not a professional appraisal. It cannot tell you what a lender will accept or what a future buyer will pay.
Keep two questions separate: what similar properties have sold for, and what you can afford to pay for this rental. A home can be fairly priced and still leave you with too little income after expenses.
Start with a dated property file
Write down the address, property type, unit count, bedrooms, bathrooms, finished living area, lot size, parking and condition. Save the listing, seller’s disclosures and inspection report. Note where each measurement came from. If tenants live there, request their leases and rent records.
Give your estimate an as-of date. A sale from last year may reflect a different market. A listing may miss a worn roof, traffic noise or an awkward layout. Visit the home and flag anything you have not checked.
Build your comparison around closed sales
A closed sale tells you what a buyer paid. An asking price tells you what a seller hopes to receive. Keep active listings in a separate part of your worksheet. They show what is for sale, without proving what buyers will pay.
Ask your agent for closed-sale records and check available local property records. Collect several candidates, then explain which ones fit best. Fannie Mae’s comparable-sales guidance emphasizes similar characteristics and competing market areas. It treats current listings as possible supporting data. This is lender appraisal guidance, not a recipe that turns your worksheet into an appraisal.
- Match the property type and unit count before comparing prices.
- Compare finished area, room count, lot utility, parking and layout.
- Check condition at the time of sale, including renovations and deferred repairs.
- Record contract and closing dates, plus any known seller credits or unusual transaction terms.
- Check the immediate surroundings. A nearby home across a major road may compete in a different market.
Price per square foot can help you spot a sale that stands out, but it does not explain those differences. If the sales you find are far away or a poor match, use a wider range. Do not force a precise answer from weak data.
Explain differences without inventing adjustments
Keep a column for differences and a column for evidence. A quote for a new roof tells you what the work may cost. It does not prove buyers would pay less for the home by that exact amount.
Fannie Mae’s adjustment guidance calls for market-supported adjustments, including evidence for time adjustments. Avoid adding a fixed amount for another bathroom or subtracting a standard percentage for an older sale without local support. For your preliminary review, explain the difference and identify the specialist or record needed to resolve it.
A hypothetical comparison and purchase budget
Suppose you are looking at a three-bedroom rental listed at $525,000. These sales and costs are made up to show the method. They are not local market evidence.
| Sale | Closed price | Comparison notes |
|---|---|---|
| A | $480,000 | Similar size and layout; older interior; closed two months ago. |
| B | $495,000 | Similar size and parking; maintained interior; closed one month ago. |
| C | $510,000 | Similar size; renovated kitchen; closed three months ago. |
The unadjusted range is $480,000–$510,000. The middle price, or median, is $495,000. That range is a starting point. You still need to weigh the homes’ condition and any market changes before drawing a conclusion about value.
Now test a $490,000 offer, $12,000 in closing costs and $18,000 for roof work. Your acquisition-and-repair budget is $520,000: $490,000 + $12,000 + $18,000. That is the cost to buy and repair the home, not its appraised value or your down payment. Your loan affects how much purchase cash you need. Keep cash for running the rental separate.
Replace each assumed cost with a quote or document before relying on it. Get a breakdown of lender fees, title and closing charges, inspection costs and repair work. The CFPB’s Loan Estimate explainer separates closing costs, cash to close and monthly payments. Ask your lender which documents apply to your investment loan.
Cross-check the price against rental income
Ask for evidence of the rent you could collect, beyond the seller’s forecast. Compare rentals with similar condition and parking. Check who pays the utilities. If tenants live there, review the lease, rent ledger and bills. Fannie Mae’s income-approach guidance connects value with expected rent or income and calls for supporting rental and sales data.
For the same hypothetical purchase, assume $3,000 monthly rent. Annual scheduled rent is $36,000. Subtract an illustrative $1,800 allowance for vacancy and unpaid rent, then $14,500 in annual operating expenses. That leaves $19,700 before financing and capital reserves.
Break down the $14,500: property taxes, insurance, routine repairs, management, owner-paid utilities, association charges and expected leasing or turnover costs. Check for costs already counted elsewhere. Do not count taxes paid through escrow twice or treat gross rent as profit.
If annual principal-and-interest payments are $18,000 and you set aside $2,400 for future replacements, the example leaves negative $700 before income taxes: $19,700 − $18,000 − $2,400. These assumptions are not recommended expense ratios. They show why a plausible sale price can still fail your rental budget. Test lower rent, longer vacancy and higher repair costs separately.
Know when to commission an appraisal
Get professional help when the sales are a poor match, the building is unusual or a large sum is at stake. Discuss an independent appraisal with a qualified local appraiser. Ask your lender about its process before paying for an appraisal for a loan. An inspection answers a different question: what condition the home is in.
Keep your sale records, quotes and income worksheet together. Before making an offer, write down the price you can support, the cash you need and the missing facts that could change either one.
Sources
Checked October 6, 2026. Fannie Mae sources describe its residential lender-appraisal framework; the CFPB source explains mortgage cost documents. Neither supplies local sale prices, rents or repair estimates.
- Fannie Mae: Comparable Sales — selection, closed sales and sale age.
- Fannie Mae: Adjustments to Comparable Sales — evidence for property, concession and time adjustments.
- Fannie Mae: Cost and Income Approach to Value — income analysis and supporting data.
- Consumer Financial Protection Bureau: Loan Estimate Explainer — closing costs and payment components.
This is general information, not legal, tax or appraisal advice.
