How to Estimate Rehab Costs for a Fix and Flip Project
Accurately estimating rehab costs is the hardest skill in fix and flip investing — and the one that separates profitable flippers from money-losers. Here's a systematic approach.
Why Rehab Cost Estimation Matters So Much
In fix and flip investing, your profit is largely locked in at acquisition. The purchase price, ARV, and rehab budget together determine whether a deal makes money. Underestimating rehab costs is the number one reason investors lose money on flips — what looked like a $40,000 rehab becomes $70,000, eliminating the expected profit.
The Systematic Walkthrough: Room by Room
Never estimate rehab costs from the curb. Walk through every room of the property systematically and assess each system and surface. Use a standardized checklist.
Roof
Check the roof age (ask the listing agent, look at permits, or have a roofer inspect). Roof replacement is often the largest single rehab expense:
- Shingle replacement: $8,000-
HVAC
- New central AC/heat system: $5,000-2,000,500-$4,500
- Furnace only:
- Mini-split system: $3,000-$7,000
- Servicing existing units: 50-$4000,000
Plumbing
- Full replumb (galvanized to PEX): $8,000-
- Water heater replacement: $800-,800,000-$4,000
- Partial repair/fixture replacement: $500-$3,000
Electrical
- Panel upgrade (100-200 amp):
- Full rewire: 0,000-5,000+
- Partial electrical updates: ,500-$5,000
Kitchen
- Full renovation (cabinets, counters, appliances): 5,000-$35,000
- Mid-range update: $8,000-
5,000,000-$4,000- Cabinet repaint + new hardware only:
Bathrooms
- Full gut renovation: $8,000-8,000
- Update (tile, vanity, fixtures): $3,000-$7,000
- Cosmetic update:
,000-,500Flooring
- Luxury vinyl plank (LVP): $4-$7/sq ft installed
- Hardwood (refinish): $3-$5/sq ft
- Carpet: $3-$5/sq ft installed
- Tile: $7-4/sq ft installed
Paint
- Interior full repaint (1,500 sq ft): $3,000-$6,000
- Exterior: $3,000-$8,000
Always Add a Contingency Buffer
Add 10-20% contingency to your total estimate. You will find hidden issues — code violations, subfloor damage, hidden mold, or aging systems that need full replacement. Investors who don't budget for contingency run over budget on nearly every deal.
How to Build a Lender-Acceptable Budget
Fix and flip lenders want to see your rehab budget documented with:
- Line-item detail (not a single "renovation: $50,000" figure)
- At least one contractor bid supporting the major line items
- Photos of the existing condition for each major scope of work
Get at least 2-3 contractor quotes for any work over
0,000. Present the mid-range quote, not the cheapest.Ready to Apply for a DSCR Loan?
Review property-cash-flow-focused purchase, refinance, and cash-out financing options.
For business-purpose loans on non-owner-occupied investment properties only.
Start Loan InquiryFor business-purpose loans on non-owner-occupied investment properties only.
- Mid-range update: $8,000-
- Full renovation (cabinets, counters, appliances):