Is That Property a Good Flip? ARV, the 70% Rule, and Profit Margins

Kelly Reider

Oct 4

5 min read

AI-generated renovation illustration (not an actual listing)

A low asking price does not automatically make a house a good investment. A promising flip needs a realistic resale value, a workable renovation plan, and enough room for every expense—and for surprises. Here is how to evaluate the numbers before buying in Virginia, North Carolina, or Maryland.

Start with ARV: what could the finished home sell for?

ARV means after-repair value: the estimated market value once the planned work is complete. It is an estimate, not a guaranteed sale price.

Use recent closed sales of comparable renovated homes in the same local market. Compare location, square footage, layout, age, condition, lot, and features. Active listings help show your competition, but asking prices do not establish what buyers actually paid. Avoid using the most expensive renovated home as your default.

Have a local real estate professional review the comparable sales and support a conservative range. Do not count unpermitted space as legal living area or assume upgrades will return dollar for dollar.

Use the 70% rule as an initial screen

The common formula is: maximum purchase price = (ARV × 70%) − estimated repairs.

With a $350,000 ARV and $50,000 renovation budget, the initial screen is $245,000 − $50,000 = $195,000. If you include a $7,500 renovation reserve in repairs, that screen drops to $187,500.

The remaining 30% is not your profit. It must cover purchase and sale expenses, financing, carrying costs, surprises, and your return. The rule is a shortcut; it does not replace an itemized budget. At the same ARV, choosing 65%, 70%, or 75% changes the allowance before repairs to $227,500, $245,000, or $262,500. Those are screening assumptions, not universal market standards. A higher percentage leaves less protection.

Build the full budget before making an offer

Include the purchase price; acquisition closing costs and due diligence; written contractor estimates; permits; a renovation contingency; financing fees and interest; property taxes, insurance, utilities, maintenance and HOA costs during ownership; and sale expenses such as negotiated brokerage fees, closing charges, staging, marketing and buyer concessions. Budget your own work or management compensation if you expect to be paid for it.

For planning, test a 10%–20% renovation contingency, and increase it if the condition or scope is uncertain. A $50,000 renovation with a 15% reserve needs another $7,500. Obtain property-specific quotes rather than treating these percentages as promised costs.

In the examples below, acquisition costs are $5,000, financing and carrying costs total $20,000, and selling costs are an illustrative 7% of the sale price. That 7% bundles several possible expenses; it is not a required commission rate. Actual fees are negotiable and costs vary. Avoid counting interest in both financing and carrying costs. Loan principal repaid at closing is not a second expense when the purchase price is already counted.

Know which margin you are measuring

Projected profit before income taxes = expected resale price − total project costs.

Profit margin = projected profit ÷ resale price × 100.

Return on total project cost = projected profit ÷ total project costs × 100.

Cash-on-cash return uses your actual cash invested and is different from return on total cost, especially with borrowed money. A small down payment can make a percentage look attractive while debt and delays still put the project at risk.

For an illustrative decision framework, test a 15%–20% profit margin on resale value, then choose a minimum dollar profit that compensates you for the time and risk. These are sample targets, not industry requirements or guarantees. For a $350,000 resale, a 15% target is $52,500. Maximum offer = conservative resale price − all nonpurchase costs − target profit. Recalculate costs that change with price or time.

Example 1: a stronger opportunity

Hypothetical property—not an actual listing or a claim about local prices. Assume comparable closed sales support a $350,000 ARV and inspections support a defined renovation scope.

Purchase: $185,000

Acquisition costs: $5,000

Renovation: $45,000

Contingency: $7,500 (16.7% of renovation)

Financing and carrying: $20,000

Selling expenses: $24,500 (7% of $350,000)

Total budget: $287,000

Projected profit before income taxes: $63,000

Profit margin: 18.0%

Return on total project cost: 22.0%

The 70% screen, including renovation and contingency, allows $192,500. The $185,000 purchase passes that screen. The full budget also exceeds the illustrative 15% profit target.

Stress test: resale falls 5% to $332,500, renovation rises 10% to $49,500, and delays add $5,000. Keeping the full $7,500 reserve in the model and adjusting selling costs to $23,275 produces total costs of $295,275 and profit of $37,225—a margin of 11.2%. It remains positive, but falls below the original 15% target. Decide in advance whether that downside is acceptable.

Example 2: a poor opportunity at the asking price

Hypothetical property with the same $350,000 ARV, but a higher purchase price and more work.

Purchase: $230,000

Acquisition costs: $5,000

Renovation: $60,000

Contingency: $9,500 (15.8% of renovation)

Financing and carrying: $20,000

Selling expenses: $24,500 (7% of $350,000)

Total budget: $349,000

Projected profit before income taxes: $1,000

Profit margin: 0.3%

Return on total project cost: 0.3%

Purchase plus renovation appears to leave a $60,000 spread, but the full budget nearly eliminates it. The 70% screen, including contingency, allows only $175,500. To target a 15% profit margin using this budget, the cost-based purchase ceiling is $178,500, subject to revised financing and closing estimates.

With a 5% lower resale, a 10% renovation overrun, and $5,000 in delay costs, total costs become $358,775 after adjusting selling expenses. The projected result is a $26,275 loss. At $230,000, this deal does not provide enough room for the modeled risks. Renegotiate based on verified costs or pass.

Check the property—not just the spreadsheet

Before committing, investigate the roof, foundation, moisture, electrical and plumbing systems, HVAC, pests, and any well or septic system. Verify title, liens, access, zoning, permits, flood exposure, insurance availability, HOA restrictions, and whether the finished home will qualify for the intended buyer’s financing.

Confirm contractor availability, written scope, payment schedule, permit timing, and realistic months from purchase through resale closing. Stress-test a longer hold and lower resale. A rental backup only helps if legal use, rent, financing and operating costs independently support it.

Use local evidence: a Franklin or Southampton County property should not borrow its ARV from an unrelated Suffolk neighborhood. North Carolina coastal properties and Maryland communities also need their own comparable sales, insurance quotes and local requirements.

A good flip has a margin for error

Look for a supported ARV, a documented repair budget, a feasible timeline, and enough profit after all costs to justify the downside. If the deal works only with the highest sale price, the cheapest contractor and a perfect schedule, keep looking.

Thinking about an investment property in Virginia, North Carolina, or Maryland? Contact Kelly Reider at 757-404-2478 or kellyreiderhomes@gmail.com to discuss local comparable sales and your buying goals. Virginia services through Hometown Realty; North Carolina and Maryland services through eXp Realty.

The examples are educational estimates and include the full contingency as a budgeted cost. Results are before income taxes; discuss tax treatment and financing with qualified professionals.