How We Priced Out Our First Flip (and Where We Were Wrong)

October 20, 2026 · Real renovation and flip numbers, start to finish

Public domain, via Wikimedia Commons

The number on our first flip budget and the number we actually spent were off by about 30 percent. That gap wasn't one big disaster. It was a dozen small things we didn't price in, plus one assumption about timeline that turned out to be wrong. If you're building your first flip budget right now, the honest answer is: whatever you've got written down, add more cushion than feels reasonable, because the categories you're missing are predictable.

Most likely cause: we priced the renovation, not the project

Our budget was basically a materials and labor estimate for the work we could see. New kitchen, new flooring, paint, a bathroom refresh, a roof patch. What we didn't line-item was everything around that work: permits, dumpster rentals, utility costs while the house sat empty, insurance for a vacant property, and the holding costs on the loan or cash tied up every single month the project ran.

This is the most common first-flip mistake, and it's easy to confirm if you've made it too. Pull up your budget spreadsheet. If every line is a trade or a material (plumber, flooring, cabinets, paint) and there's no line for "holding costs" or "permits and fees," you've priced the renovation, not the project. Those soft costs on a typical flip can run 10 to 20 percent of the total budget, sometimes more if the project runs long, and they're the easiest thing to leave off because no contractor quotes them for you.

Less common causes: the mistakes that only show up once you're already in

Beyond missing the big soft-cost categories, there were a few more specific ways our numbers drifted. These are worth checking against your own budget before you start.

• We used retail quotes, not trade quotes, for materials. Our flooring and cabinet numbers came from a showroom visit, not from what a contractor actually pays with a trade account. The gap was noticeable, often 10 to 15 percent, sometimes more on cabinets and tile. Confirm this by asking your contractor what they pay versus what's listed at retail, before you build the budget around sticker prices.
• We assumed a four-month timeline with no float. Permitting delays, one inspector who wanted a change we hadn't planned for, and a two-week wait on a backordered vanity turned four months into closer to six. Confirm your own timeline risk by asking: does this budget assume every trade shows up on schedule and every inspection passes the first time? If yes, it's an optimistic case, not a real one.
• We didn't separate "known issues" from "discovery risk." Things we could see when we bought the house (old electrical panel, worn flooring) were budgeted. Things we couldn't see until walls were open were not, beyond a vague contingency line. Confirm this by checking if your contingency is a real percentage of the renovation budget (we'd now say 15 to 20 percent on an older house) or just a round number that felt safe.

How to fix it: building a budget that holds up

If you're putting together your first flip budget now, here's the order we'd do it in, having learned the hard way.

• Start with a real inspection, not a walkthrough. Pay for a full inspection before you commit to numbers, including roof, electrical panel, plumbing supply lines, and foundation. This costs a few hundred dollars and tells you what's a known cost versus a guess.
• Get two to three contractor quotes for the major trades (electrical, plumbing, HVAC if touched, roofing) before finalizing your renovation line items. Don't use a single quote as your baseline; quotes for the same scope can vary 20 to 30 percent between contractors.
• Add a soft-costs line that's not an afterthought. Permits, dumpster, utilities, insurance, and holding costs (loan interest or opportunity cost on cash) should be their own section of the budget, not folded into "misc." For most residential flips this runs somewhere between 8 and 15 percent of the total project cost, depending on how long the project takes and how it's financed.
• Set contingency at 15 to 20 percent of the renovation budget on anything built before the 1990s, and 10 to 15 percent on newer builds. This isn't padding for comfort. It's a realistic allowance for what's behind the walls you haven't opened yet.
• Build the timeline with slack, then price the slack. If your contractor says four months, budget holding costs for five or six. If the project finishes early, that's a win. If you budgeted for four and it takes six, that's a budget failure, not a surprise.
• Re-price after demo, not just before. Once walls are open, get updated numbers on anything that changed scope, electrical and plumbing especially. Don't keep running on the original quote if the scope has shifted.

When the numbers mean you shouldn't do the project

Here's the part that's uncomfortable but matters. Sometimes a careful budget tells you the flip doesn't work, and the right move is to walk away or change the plan, not find a way to make the spreadsheet say yes.

A rough rule a lot of experienced flippers use is some version of the 70 percent rule: purchase price plus renovation costs should land at or below about 70 percent of the after-repair value, leaving room for selling costs, holding costs, and profit. It's a rough guide, not gospel, and it varies a lot by market, but if your numbers are coming in at 85 or 90 percent of ARV before you've even hit a surprise, there's no cushion left for the discovery risk every older house carries.

Specific situations where the math usually doesn't work:

• A house that needs full electrical and plumbing replacement plus structural work, where those three alone can run well into six figures depending on size, and the after-repair value in the neighborhood doesn't support that spend.
• A timeline longer than eight or nine months in a market where holding costs (loan interest, taxes, insurance, utilities) are high relative to the home's value. The longer it sits, the more the holding costs eat into whatever margin you built in.
• A first flip where you're also acting as general contractor with no experience managing trades. The labor savings can be real, but the time and mistake cost often isn't priced in anywhere, and it should be, even if it's just your own hours valued honestly.

We didn't walk away from ours, and it still worked out, but barely, and only because the market moved in our favor during the extra two months. That's not a plan, it's luck. The budgeting mistakes we made are common enough that we wrote them down here at Fixer Files so the next version of us, or you, catches them before the contract is signed instead of after the drywall is up.