Why Rehab Estimates Make or Break a Flip
Renovation cost overruns are the number one reason flips fail. A 20% budget miss on a $60,000 rehab is $12,000 — and on a project with a $40,000 target profit, that wipes out nearly a third of your return before commissions.
Experienced flippers don't guess. They estimate systematically, build in contingency, and verify assumptions before going under contract.
The Scope Walk-Through
Before you can estimate costs, you need to understand the scope. Walk every room and document every item that needs work:
Exterior
- Roof condition and estimated remaining life
- Siding, paint, and trim
- Windows and doors
- Landscaping and curb appeal
- Driveway and walkways
- Foundation (cracks, settling, moisture)
Interior
- Flooring (every room)
- Walls and ceilings (paint, drywall repair, texture)
- Kitchen (cabinets, counters, appliances, backsplash)
- Bathrooms (vanity, tub/shower, tile, fixtures)
- Lighting and electrical
- Plumbing fixtures and supply lines
- HVAC system condition
Estimating Methods
Per-Square-Foot Method
A quick way to ballpark costs by renovation level:
| Renovation Level | Cost Per Sq Ft |
|---|---|
| Cosmetic (paint, flooring, fixtures) | $15–$30 |
| Moderate (kitchen, baths, some systems) | $30–$60 |
| Full gut renovation | $60–$120+ |
A 1,500 sq ft moderate rehab would estimate at $45,000–$90,000 using this method.
Line-Item Method
More accurate than per-square-foot. Break the budget into individual line items:
- Demolition: $2,000–$5,000
- Roof replacement: $6,000–$15,000
- Kitchen remodel: $8,000–$25,000
- Bathroom remodel (each): $4,000–$12,000
- Flooring (per sq ft installed): $3–$8
- Interior paint (entire house): $3,000–$7,000
- HVAC replacement: $4,000–$10,000
- Electrical panel upgrade: $1,500–$3,000
- Plumbing rough-in/repair: $2,000–$6,000
Get Contractor Bids
For any project over $30,000 in rehab, get at least two contractor bids. Compare not just price, but timeline, payment schedule, and references.
The Contingency Rule
Always add a contingency buffer to your budget:
- First-time flippers: 20% contingency
- Experienced flippers: 10–15% contingency
- Known scope, trusted contractor: 10% minimum
This accounts for hidden damage, price increases, and scope changes that inevitably arise once walls are opened.
Common Cost Traps
- 1Permit costs and delays — factor in permit fees and the extra holding time
- 2Utility connection fees — especially on vacant properties
- 3Mold and asbestos — older homes may require environmental remediation
- 4Structural issues — foundation or framing problems visible only after demo
- 5Over-improving — don't install $50,000 finishes in a $200,000 ARV neighborhood
Model Your Flip
Use our Fix & Flip Calculator to plug in your rehab estimate and see how it impacts total project profitability.
Schedule a call to discuss your project with a Prime Advisor.