Fix and flip investing remains one of the most popular entry points into real estate development. The concept is straightforward - buy a property below market value, renovate it, and sell it at a profit. But the difference between a profitable flip and a money pit comes down to one thing: your deal analysis.
In this guide, we will walk through the complete process for analyzing a fix and flip deal, from finding the right property to calculating your projected profit.
Understanding the 70% Rule
The 70% rule is the most widely used quick-screening formula in fix and flip investing. It states that you should pay no more than 70% of a property's after-repair value (ARV), minus the cost of repairs.
Formula: Maximum Offer = (ARV x 0.70) - Repair Costs
For example, if a property has an ARV of $400,000 and needs $50,000 in repairs, your maximum offer should be ($400,000 x 0.70) - $50,000 = $230,000.
The 30% margin accounts for holding costs, closing costs (buying and selling), real estate agent commissions, and your profit. In competitive markets, some investors use 75% or even 80%, but this significantly compresses your profit margin and leaves less room for error.
Step 1: Determine the After-Repair Value (ARV)
The ARV is the estimated market value of the property after all renovations are complete. This is the single most important number in your analysis because every other calculation flows from it.
To determine ARV accurately:
- Pull 3-6 comparable sales (comps) within 0.5 miles that sold in the last 90 days
- Filter for properties with similar square footage (within 15%), bedroom/bathroom count, and lot size
- Adjust for differences in condition, upgrades, and location within the neighborhood
- Focus on renovated or recently updated properties that represent your planned finished product
- Verify comps are arm's-length transactions (not foreclosures, short sales, or family transfers)
Step 2: Estimate Rehab Costs
Accurate rehab estimation is where experienced flippers separate themselves from beginners. Underestimating rehab costs is the number one reason flips lose money.
Break costs into categories:
- Kitchen: Cabinets, countertops, appliances, flooring, backsplash. Budget $8,000-$30,000 depending on scope.
- Bathrooms: Vanity, toilet, tub/shower, tile, fixtures. Budget $3,000-$15,000 per bathroom.
- Flooring: LVP/hardwood throughout typically runs $3-$8 per square foot installed.
- Paint: Full interior repaint typically costs $1.50-$3.00 per square foot.
- Exterior: Roof, siding, landscaping, driveway. These can be budget-breakers.
- Mechanicals: HVAC, electrical panel, plumbing. Always inspect these carefully.
Add a 10-15% contingency buffer on top of your estimates. Unexpected issues always come up during renovation - foundation problems, mold, outdated wiring, or plumbing issues hidden behind walls.
Step 3: Calculate Holding Costs
Holding costs are the expenses you incur every month you own the property. These are often underestimated or completely overlooked by new investors.
- Mortgage/hard money interest: Typically 10-14% annually for hard money loans
- Property taxes: Prorated monthly amount
- Insurance: Builder's risk or vacant property insurance
- Utilities: Electric, water, gas during renovation
- HOA fees: If applicable
- Loan points/origination: Typically 1-3 points upfront
Multiply your monthly holding costs by your estimated project timeline. Most flips take 4-6 months from purchase to sale. Conservative investors budget for 6-8 months.
Step 4: Account for Transaction Costs
Transaction costs eat into your profit on both ends of the deal:
- Buying costs: Closing costs (1-3% of purchase price), inspection, appraisal
- Selling costs: Real estate agent commissions (5-6%), closing costs (1-2%), staging, photography
- Transfer taxes: Vary by state and municipality
Step 5: Calculate Your Projected Profit
With all costs accounted for, the profit calculation is straightforward:
Profit = ARV - Purchase Price - Rehab Costs - Holding Costs - Transaction Costs
Most experienced flippers target a minimum net profit of $25,000-$40,000 per flip, or a minimum ROI of 15-20% on total invested capital. Anything below that may not justify the risk and effort involved.
Using a Fix and Flip Calculator
Running these numbers by hand or in a spreadsheet is time-consuming and error-prone. A dedicated fix and flip calculator automates the math, ensures you do not forget any cost categories, and lets you quickly run scenarios by adjusting variables like ARV, rehab costs, or holding period.
Opsite's fix and flip calculator includes all the inputs covered in this guide, plus AI-powered deal scoring that evaluates the opportunity across multiple dimensions including location quality, market conditions, and comparable sales.
Common Mistakes to Avoid
- Overestimating ARV by using comps that are too far away or too different from your property
- Underestimating rehab costs by not getting contractor bids before making an offer
- Forgetting holding costs, especially on projects that run over timeline
- Not accounting for agent commissions on the sale (this is 5-6% of ARV)
- Falling in love with a property and letting emotion override the numbers
- Over-improving for the neighborhood - you cannot renovate beyond the neighborhood ceiling
The Bottom Line
Every successful flip starts with disciplined deal analysis. The numbers either work or they do not - and the time to discover that is before you make an offer, not after you are holding the keys. Use the 70% rule as your first filter, then dig deeper into ARV, rehab costs, holding costs, and transaction costs to build a complete profit projection.