Flipping houses can be one of the fastest ways to build wealth in real estate. The idea is simple, you buy a property that needs work, you renovate it, and you sell it for a profit.

But if you’ve been around the block, you know it’s not always that smooth. Costs run high, timelines stretch, and profits shrink. The good news is most of these problems can be avoided with the right preparation.

Here are five of the most common mistakes that derail a flip, and what you can do to avoid them.

1. Overestimating the After-Repair Value (ARV)

The ARV is the number that drives your entire deal. Too many investors assume their property will sell at the top of the market, only to find out buyers don’t see it that way.

How to protect yourself:
Look at recent sales within a half-mile radius. Match for square footage, bedrooms, bathrooms, and style. Be conservative with your estimate. If you believe you can sell for $750,000, run your numbers at $725,000. If it still works, you’re in a strong position. Find a local realtor and ask them their opinion of value. Get a range and use the low end of that range in your analysis.

2. Underestimating Rehab Costs

Renovations almost always cost more than expected. A simple flooring project can turn into new subflooring, and a quick kitchen update can uncover major plumbing issues.

How to protect yourself:
Get at least two detailed contractor bids before you buy. Walk the property with a contractor who has flipped before. Then, add 10 to 15 percent to your rehab budget as a safety net. That “extra” money isn’t wasted, it’s the cushion that protects your profit in case there are surprises.

3. Forgetting About Carrying Costs

Even if your renovation goes according to plan, holding the property costs money every single month. Taxes, insurance, utilities, HOA fees, and interest on your loan all add up.

How to protect yourself:
Add up your monthly costs and multiply by your expected timeline. Then, add a few extra months in case the project runs long. Work with a lender who offers flexibility so you’re not penalized for paying off your loan early. Ask about prepayment penalties.

4. Hiring the Wrong Contractor

A bad contractor can cost you more than any line item in your budget. Missed deadlines, sloppy work, and sudden change orders can destroy your timeline and eat your profit.

How to protect yourself:
Check references, ask to see past work, and put everything in writing. Tie payments to completed milestones instead of paying too much up front. Remember, the lowest bid can often be the most expensive mistake.

5. Not Having an Exit Plan

Too many investors buy without knowing how they’ll finish. Will you sell right away, refinance into a rental, or hold until the market improves? Without a plan, you’re left scrambling.

How to protect yourself:
Decide your exit strategy before you close on the property. Run the numbers for more than one option, and work with a lender who can support both short-term flips and long-term rentals.

The Bottom Line

Fix and flips are profitable when they’re planned, not guessed. If you can avoid these five mistakes, you’ll protect your margins and set yourself up for repeat success.

At Mayacamas Lending, we don’t just provide financing, we partner with real estate investors across California to help them make smart decisions and close quickly.

👉 Got a deal in mind? Reach out to us today and let’s talk through it. We’ll review your numbers, give you honest feedback, and show you what financing options are available.

Because the best flips don’t start with paint colors, they start with the right plan and the right partners by your side.