How to Calculate After Repair Value (ARV) on an Investment Property
By Matthew Martinez, Founder, CEO & Managing Broker, Diamond Real Estate Group. California DRE #01869679.
After repair value (ARV) is the price a property should sell for once the planned renovation is finished. You estimate it from recent sales of comparable homes that are already in the condition you plan to deliver, then adjust for differences in size, location, lot and features. ARV is the ceiling for your whole deal: purchase price, rehab, holding and selling costs and profit all have to fit under it.
Most flips that lose money do not fail on the renovation. They fail on the ARV. An investor picks the best sale in the area, assumes the finished house will match it, and backs into a purchase price that was never going to work. This guide shows a disciplined way to estimate ARV, how to use it to set a maximum offer, and what changes in Sonoma, Napa and the rest of the North Bay.
It is written for investors and owner-occupants buying a fixer. It is not tax, legal or lending advice; confirm deal-specific questions with your lender, CPA and attorney.
What ARV is, and what it is not
ARV is a market value opinion for a future condition. It is not the list price you hope for, the appraised value of the house today, or a number from an automated estimate. Automated valuation models are built on public records and usually do not know that a kitchen is gutted or that a garage was converted without permits, so treat them as a starting point only.
Lenders also care about ARV. Hard money and renovation lenders often size the loan as a percentage of ARV or of total cost, and they will order their own appraisal or broker opinion. If your number is far above theirs, you will find out at the worst moment. Our real estate glossary defines ARV, BPO, CMA and related terms if you want a quick reference.
Step 1: Pull the right comparable sales
Good comps are recent, close and similar, and they must reflect the finished condition you plan to deliver. Start with these filters:
- Time: closed sales from the last three to six months. Go back further only in thin markets, and adjust for any price movement since.
- Distance: the same neighborhood or a comparable one with the same buyer pool. In rural areas that can mean a few miles; in a town grid it may mean a few blocks.
- Property type: same type (detached, condo, duplex), similar age and style, similar lot.
- Size: living area within about 15 to 20 percent of the subject, and the same bedroom and bathroom count where possible.
- Condition: renovated or recently updated homes only. Note the level of finish in the photos.
Look at pending and active listings too. Pendings tell you where the market is heading; actives tell you what your finished house will compete against on the day you list. A closed sale is still the strongest evidence.
Step 2: Adjust the comps to the subject
No comp is identical. Adjust each comp’s sale price toward the subject: if a comp has something the subject will not, subtract its value; if the subject will have something the comp lacks, add it.
| Difference | Typical direction | Notes |
|---|---|---|
| Living area | Adjust per square foot, at a lower rate than the average price per foot | The last few hundred feet are worth less than the first |
| Bedrooms and baths | Add or subtract for a missing or extra bathroom | A second bathroom often matters more than a fourth bedroom |
| Garage and parking | Add or subtract | Garage conversions without permits may not count |
| Lot and setting | Adjust for usable size, views, busy roads, slope | Vineyard or open-space views can carry a premium |
| Location within town | Adjust for walkability, traffic, flood or fire exposure | Insurance cost and availability now affect buyers |
| Pool, ADU, outbuildings | Adjust if permitted and functional | An unpermitted ADU may add little or create risk |
After adjusting, the comps should cluster. Weight the two or three most similar sales most heavily. If the adjusted values still spread widely, you are missing something, and the safe move is to use the lower end.
Step 3: Reconcile and stress-test
Settle on a single ARV and then test it. Ask three questions:
- Would a buyer’s appraiser reach the same number with the same comps?
- Will the market be the same in six to nine months, when you actually sell?
- How much profit is left if the ARV comes in 5 or 10 percent lower?
If a 5 percent miss wipes out your margin, the deal is too thin. For a second opinion on a specific address, our home valuation service can prepare a comparative market analysis.
Step 4: Turn ARV into a maximum offer
Once you have ARV, work backward. Many investors use the shorthand “70 percent rule”: maximum offer equals 70 percent of ARV minus repair costs. It is a quick screen, not a law, and in high-priced North Bay markets it often rules out every deal. A full cost stack is more reliable.
| Line item (illustrative example) | Amount |
|---|---|
| Estimated ARV | $1,000,000 |
| Rehab budget including permits | $150,000 |
| Contingency (15% of rehab) | $22,500 |
| Holding costs: interest, taxes, insurance, utilities for 8 months | $60,000 |
| Buying costs: escrow, title, loan fees | $20,000 |
| Selling costs: commissions, transfer tax, escrow, staging | $60,000 |
| Target profit (12% of ARV) | $120,000 |
| Maximum purchase price | $567,500 |
These numbers are an example only. Your rates, timeline and fees will differ. Get real quotes for financing and insurance before you rely on a holding-cost figure.
Estimate rehab costs from bids, not guesses
ARV only works if the renovation delivers the condition your comps show. To keep the budget honest:
- Get a full inspection plus specialist reports where needed: roof, sewer lateral, foundation, pest, and for rural homes, well and septic.
- Collect at least two or three written bids with a defined scope. Check contractor licenses with the Contractors State License Board.
- Price permits and plan-check time. Building permits applied for on or after January 1, 2026 fall under California’s 2025 Energy Code, which expands heat pump use and electric-ready requirements in new construction, so check with the building department how your scope is affected.
- Carry a contingency of 10 to 20 percent, more for older homes.
Older properties have their own risks. Our post on whether a fixer-upper is right for you covers the common surprises.
What changes in Sonoma, Napa and the North Bay
- Thin comp sets. Small towns and rural parcels produce few sales. Expect to widen the time window and lean harder on adjustments.
- Wells, septic and acreage. Two similar houses can differ sharply in value because of water supply, septic capacity or usable land. See our guide to wells, septic and rural utilities in Sonoma County.
- Fire exposure and insurance. Buyers now ask about insurance before they write an offer. Homes that are hard to insure can sell for less than their comps suggest.
- Permitting timelines. County and city timelines vary. A long plan check adds holding cost, which reduces what you can pay.
For local inventory and rental context, see our Sonoma investment property page.
Common ARV mistakes
- Using one standout sale instead of a group of comps.
- Comparing to homes with finishes you are not budgeting for.
- Ignoring the active listings you will compete against.
- Counting unpermitted space or an unpermitted ADU at full value.
- Forgetting that a sale within a year is taxed as a short-term gain. The IRS treats assets held one year or less as short-term; talk to a tax adviser about how that affects your numbers.
Questions people ask
How many comps do I need for an ARV?
Three to five good closed sales is a solid base. Fewer is acceptable in rural markets if the comps are close in type and condition and you explain your adjustments.
Is ARV the same as an appraisal?
No. ARV is your estimate of a future value. An appraisal is a licensed appraiser’s opinion, usually for a lender. Renovation lenders may order an “as-completed” appraisal, which is the closest thing to an official ARV.
Does the 70 percent rule work in California?
It is a useful screen, but in high-priced markets the fixed percentage can be too strict or too loose. Build the full cost stack instead and check your margin under a lower ARV.
Can I use ARV for a buy-and-hold rental?
Yes. In the BRRRR approach, ARV drives the refinance amount. Our explainer on the BRRRR method walks through how lenders treat it.
If you are evaluating a fixer in Sonoma, Napa, Marin or Solano County, we can pull comps, walk the property and help you pressure-test the numbers before you write an offer. Start on our investor services page.
Sources & notes
- IRS Topic No. 409, Capital Gains and Losses (Internal Revenue Service)
- 2025 Building Energy Efficiency Standards (California Energy Commission)
- Contractors State License Board (State of California)
- The cost table is an illustrative example, not a quote or a projection of returns.
Last reviewed October 2026 by Matthew Martinez.
