How Much Should You Budget for House-Flipping Rehab Costs?

There's no reliable universal per-square-foot number for rehab costs — labor and material costs vary widely by region, and a "light cosmetic" flip and a full gut renovation aren't remotely comparable. What's consistent across markets is the process for building a budget you can trust.

Break the budget into categories

Rather than a single lump-sum guess, build the budget line by line: roof and exterior, HVAC and electrical, plumbing, kitchen, bathrooms, flooring, paint, and landscaping/curb appeal. Get an actual walkthrough estimate for each major system from a licensed contractor — especially roof, foundation, electrical, and plumbing, where a rough visual guess is most likely to be wrong and most expensive to get wrong.

Scope the renovation to the ARV, not the other way around

Match your renovation level to what the neighborhood's comps actually support. Installing a luxury kitchen in a starter-home market rarely returns its cost at sale — see the ARV guide for how to pull realistic comps first, then scope the rehab to match what buyers in that price band expect.

Always add a contingency

Older properties routinely reveal problems once walls are opened — outdated wiring, water damage, foundation issues. A common practice is to add 10-20% on top of the line-item estimate as a contingency reserve, scaled to the property's age and how much of it was actually inspected before closing (a full inspection reduces the unknowns; a fast as-is purchase increases them).

Account for the timeline, not just the total

A rehab budget isn't just a dollar figure — it's also a schedule. Every month a project runs past its planned timeline adds holding costs (loan interest, taxes, insurance, utilities) that aren't part of the renovation budget itself but come directly out of profit. Permit delays and contractor scheduling are the most common causes of overruns; build slack into the timeline the same way you build contingency into the dollar budget.

Put it into the full deal analysis

Once you have a real, contractor-informed rehab number, run it through the House Flip Calculator alongside purchase price and ARV to see the actual projected profit — and check it against the 70% Rule as a fast sanity check before making an offer.