Deal Analysis Mistakes That Sink New Flippers
By the ACC Solutions team
Short answer: new flippers rarely lose money on one huge mistake. They lose it on four or five small ones stacked together: an ARV that's a little high, a rehab that's a little low, a timeline that's a little short, and costs left off the sheet. Each one looks harmless alone. Below are the mistakes we see most in flip numbers, what each looks like on paper, and the check that catches it before you sign.
This is the last of our deal-analysis basics. If you're new, read them in order: how to calculate ARV, the 70% rule, estimating rehab cost per square foot and the flip profit formula. Then use this page as the checklist you run before every offer.
How small mistakes stack: a made-up example
Every number here is invented to show the math. It isn't an app output, a typical result or a Cleveland price.
| Line | On paper | What really happened | Profit change |
|---|---|---|---|
| ARV | $180,000 | $171,000 (5% lower; the best comp was a corner lot with a garage) | -$9,000 |
| Rehab | $40,000 | $46,000 (15% higher; the sewer line needed work) | -$6,000 |
| Holding | 6 months at $1,000 | 9 months (permit and inspection waits, slower sale) | -$3,000 |
| Selling | $12,000 buying and selling costs | Buyer asked for $2,000 toward closing | -$2,000 |
| Profit | $22,000 (180,000 - 100,000 purchase - 40,000 - 6,000 - 12,000) | $2,000 | -$20,000 |
No single miss was bigger than $9,000, and none of them would feel like a disaster on its own. Together they took 91% of the profit. That's why the fix isn't one better formula; it's checking each line.
Mistake 1: Treating list price or an online estimate as ARV
On paper: ARV equals the highest renovated listing you can find, or an online value estimate. The check: ARV comes from sold homes that are recent, nearby and similar (beds, baths, square footage, style, lot, garage), and renovated to the level you plan. Active listings are asking prices, not proof. Pull them yourself with our guide to pulling comps for a flip.
Mistake 2: Comps that only look comparable
On paper: three comps within a mile, all similar size. The check: look at what's different. A comp across a city line, a busy road or a school district boundary may not apply. In Cuyahoga County that matters more than people expect, because neighboring cities have different point-of-sale rules and inspections, which buyers and their lenders notice. Drop the comp that carries your whole ARV and see if the deal still works.
Mistake 3: A rehab number with no scope behind it
On paper: a cost per square foot times the size of the house. The check: write the scope room by room, then list the big systems separately: roof, foundation, sewer line, electrical service, heating, plumbing supply lines, windows. Those are the items that blow budgets, and a square-footage number can't see them. Add a contingency line and keep it. If the house was built before 1978, plan for lead-safe work practices on painted surfaces (the EPA's RRP program applies to contractors working on those homes).
Mistake 4: Leaving off holding costs
On paper: purchase plus rehab. The check: holding costs run every month you own the house: property taxes, insurance (vacant-property insurance often costs more), utilities, lawn and snow, and loan interest. Local fees count too. A vacant house in the City of Cleveland, for example, has to be registered with the city's vacant property registry ($70 per unit for one to three units, per the city's page). Multiply your monthly total by a realistic timeline, not a hopeful one.
Mistake 5: Forgetting buying and selling costs
On paper: profit equals sale price minus purchase minus rehab. The check: add closing costs when you buy, then commissions, title and closing costs, transfer fees and any concessions when you sell. Selling costs scale with the sale price, so a higher ARV also means higher selling costs. Our free flip profit calculator has a line for each.
Mistake 6: Ignoring the cost of the money
On paper: "I'll use a loan." The check: points at closing, interest during the hold, draw or inspection fees, and extension fees if the project runs long. Even with cash, the money has a cost: it can't fund your next deal while it's tied up in this one. Get the lender's actual term sheet before you rely on a number.
Mistake 7: A timeline with no waiting in it
On paper: a 90-day rehab and a quick sale. The check: add time for closing, permits and inspections, contractor scheduling, material delays, listing time and the buyer's financing. Then rerun holding costs for that timeline. In the example above, three extra months cost $3,000.
Mistake 8: Not checking the house's paperwork
On paper: the rehab covers what you can see. The check: open code violations, condemnation and legal-use problems can add work you didn't plan for. In the City of Cleveland, the Certificate of Disclosure provides violation, condemnation and legal-use information for one- to four-unit sales; the city lists it at $60 and three to five days. Our guide to running a Cleveland flip deal covers those steps in order.
Mistake 9: Analyzing the deal you want
On paper: every assumption bends toward yes. The check: run a second, pessimistic version: ARV 5% lower, rehab 15% higher, three more months. If the deal only works in the optimistic version, it's a pass or a lower offer. The 70% rule exists partly to build in that cushion, but it's a rule of thumb, not a promise of profit.
The pre-offer checklist
- ARV from sold, recent, similar, nearby comps, with the best comp removed as a test.
- Rehab from a written scope, big systems listed separately, plus a contingency.
- Holding costs for a realistic timeline, including local registrations.
- Buying, selling and financing costs as separate lines.
- City paperwork checked for violations or use problems.
- A pessimistic version that still makes money.
Get the first read faster
Steps 1 and 2 take the longest when you're screening a lot of addresses. The A.I. Deal Assistant gives you a fast first read from a property address or a Zillow or listing link: ARV from recent comps, a rehab estimate and projected flip profit. Use it to decide which deals get the full checklist. Its results are estimates for screening, not appraisals or inspections. The Free plan is 10 searches with 72-hour access and no credit card needed.
Try 10 free deals · See how the A.I. Deal Assistant works
ACC Solutions team
Phone: (216) 238-5999 · Email: support@accmgmtsolutions.com · Contact form
6545 Market Ave N, Canton, OH 44721
We work asynchronously, so you can reach us by email or the contact form from any time zone; you don't need to catch us during Ohio business hours.
Frequently Asked Questions
What is the most common deal analysis mistake in house flipping?
Overstating ARV, usually by using list prices or an online estimate instead of recent sold comps that are truly similar. Because ARV drives the purchase price and the profit, a small ARV miss carries through the whole deal.
How do I avoid underestimating rehab costs?
Write the scope room by room, list big systems such as roof, foundation, sewer line, electrical service and heating separately, get bids on anything major, and keep a contingency line in the budget.
What costs do new flippers forget?
Holding costs (taxes, insurance, utilities, interest and local registrations), buying and selling costs (closing, commissions, title, transfer fees and concessions), and financing costs such as points and extension fees.
How do I stress-test a flip deal?
Run a pessimistic version with ARV 5% lower, rehab 15% higher and three more months of holding. If the deal only makes money in the optimistic version, pass or offer less.
Can the A.I. Deal Assistant catch these mistakes for me?
It gives a fast first read from an address or listing link: ARV from recent comps, a rehab estimate and projected flip profit. It helps you decide which deals deserve the full checklist, but the results are estimates, not appraisals or inspections, so you still check comps, scope and costs yourself.
