If you are looking at fix-and-flip opportunities in Arizona, the single most important number you need to get right is the After Repair Value, or ARV. Get the ARV wrong and everything downstream, your offer price, your rehab budget, your profit projection, falls apart. Here is how to calculate it properly.
What Is ARV?
ARV is the estimated market value of a property after all planned renovations and repairs are completed. It is not what the property is worth today in its current condition. It is what it will be worth once the work is done and it is listed on the market.
The calculation seems simple on the surface: find comparable homes that are already in the condition you plan to achieve, and base your ARV on what those homes have sold for recently. In practice, getting this right takes discipline and local knowledge.
The 70% Rule as a Starting Framework
Most experienced flippers use the 70% rule as an initial screening tool. The formula is:
Maximum Offer = (ARV x 0.70) - Repair Costs
So if you estimate the ARV at $400,000 and the rehab will cost $60,000, your maximum offer should be ($400,000 x 0.70) - $60,000 = $220,000. The 30% margin covers your holding costs, transaction costs, and profit.
In competitive Arizona markets like Phoenix, Tempe, and Mesa, some investors work with thinner margins, using 75% or even 80% of ARV. This is riskier but sometimes necessary to win deals. The important thing is to know your numbers and be honest about the risk.
Selecting the Right Comps for ARV
This is where most flip deals go wrong. Investors cherry-pick the highest comp to justify a higher ARV, which inflates their projected profit and leads them to overpay. Here is a more disciplined approach:
Match the finished product, not the current condition. Your comps should reflect what the property will look like after rehab. If you are planning a standard cosmetic renovation (new flooring, paint, fixtures, appliances), look for homes that sold recently with similar finishes.
Stay within a tight geographic radius. In Arizona markets, even a mile can make a difference. A comp in a different subdivision or school zone may not be relevant. Aim for comps within a half-mile when possible, and never go beyond a mile unless the area is rural.
Prioritize recent sales. In a shifting market, a comp from six months ago may not reflect current conditions. Focus on sales from the last 90 days, and weight them more heavily than older transactions.
Adjust for differences. No two homes are identical. If your target property will be 1,800 square feet and the best comp is 2,100 square feet, you need to adjust. Price-per-square-foot adjustments work for rough estimates, but a regression-based approach that accounts for the non-linear relationship between size and price is more accurate.
Arizona-Specific Considerations
The Arizona flip market has some unique dynamics. Pool condition is a major factor. A property with a neglected pool can have a $20,000 to $40,000 cost just to bring the pool back to functional condition. Desert landscaping versus grass also affects value differently here than in other markets. And the age of the roof matters more in Arizona's extreme heat, where roof replacements are expensive and frequent.
Also consider the season. Arizona's market is typically strongest from January through April when snowbird buyers are active. Listing a flip in July or August means competing against lower demand and extreme heat that discourages showings.
Using Data to Validate Your ARV
Before committing to a deal, validate your ARV with multiple data points. Pull comps yourself, check what similar flips have sold for recently, and get an independent estimate.
Prysm's property valuation tool can help with the comp analysis side. Enter the property address to see recent comparable sales, their adjusted prices, and a statistical confidence grade. For flip analysis specifically, Prysm's deal calculator lets you input purchase price, rehab costs, and holding period to project returns against the comp-based valuation.
The bottom line: conservative ARV estimates and disciplined comp selection are what separate profitable flippers from the ones who lose money. Do the homework before you make the offer.