How to estimate rehab costs for a flip

Rehab is the number most likely to be wrong in a flip, and an overrun comes straight out of your profit. Costs vary a lot by market, so the goal here is a process, not a price list.

1. Walk it with a checklist, top to bottom

• Big-ticket systems first: roof, foundation, structure, electrical panel and wiring, plumbing supply and drain lines, HVAC, water heater, sewer or septic.
• Envelope: windows, siding, gutters, drainage and grading.
• Interior: kitchen, bathrooms, flooring, drywall, paint, doors, trim, lighting.
• Exterior and curb appeal: landscaping, driveway, porch, exterior paint.
• Red flags worth a specialist: water stains, sagging floors, cracked foundation, old electrical, signs of mold or pests.

2. Decide the finish level from the comps

Look at the renovated homes that support your ARV and match their finishes. Going above the neighborhood rarely pays back; going below it can hurt your sale price.

3. Get real numbers

• Get at least two or three bids on major trades, written to the same scope so they're comparable.
• Use a sewer scope and a general inspection before you close, or during your inspection period.
• Price materials yourself at local suppliers for items you'll choose (cabinets, flooring, fixtures).
• Ask local investors and agents what recent jobs actually cost; your own past jobs are the best data of all.

4. Build a line-item budget

List every item with quantity, unit cost, and who's doing it. A single "kitchen: $X" line hides mistakes; "cabinets, counters, sink, faucet, backsplash, appliances, install" exposes them.

5. Add the costs people forget

• Permits, plans, and inspection fees
• Dumpsters, debris removal, and cleaning
• Utilities during the project
• Lender draw inspection fees
• Staging and photos for the sale
• Your own time if you're managing it

6. Add a contingency

Older homes and bigger scopes hide more surprises. Many investors add a contingency line as a percentage of the rehab budget and raise it for older or more distressed properties. Pick a number you'd be comfortable explaining to a lender.

7. Stress-test the deal

Run your numbers in the flip profit calculator, then rerun with rehab higher and the hold a couple of months longer. If the profit disappears, renegotiate or pass. Use the 70% rule calculator as a quick first screen.