The 70% Rule Explained: How to Calculate Maximum Purchase Price
The 70% rule is the most widely used formula in fix-and-flip investing. Learn how it works, when to use it, and when to break it.
Not every flip needs new drywall. Understanding when a cosmetic refresh outperforms a full gut protects your margins.
A cosmetic renovation updates finishes and surfaces without modifying underlying systems or layouts. A full gut strips the property to framing and rebuilds everything. Both can be profitable, but they have very different risk, timeline, and capital profiles.
Cosmetic renovations typically cost $15,000–$40,000 and take 4–8 weeks. They include paint, flooring, kitchen and bath cosmetic updates (cabinets painted or replaced, countertops, fixtures), lighting, interior doors, and minor exterior improvements. The upside is speed, capital efficiency, and predictability. The ceiling is that you can't transform a property's fundamental appeal, if the layout is bad or systems are failing, cosmetic work won't fix it.
Full gut renovations cost $75,000–$200,000+ and take 4–8 months. They typically involve new electrical, plumbing, HVAC, drywall, flooring, kitchen, baths, and often layout modifications. The upside is dramatic value creation, you can turn a $150,000 property into a $400,000 property. The downside is capital intensity, timeline risk, and the high probability of unexpected issues driving budget overruns.
The right choice depends on property condition, market, and investor experience. Cosmetic flips make sense when the property has good bones, a functional layout, and competitive cosmetic condition can bring it to market-ready. Full guts make sense when systems are failing, the layout is seriously compromised, or market comps dictate a higher finish level than existing finishes support.
Newer investors should start with cosmetic deals. The shorter timeline, smaller capital requirement, and lower risk of surprises compress the learning curve. After 3–5 cosmetic deals, graduating to moderate renovations (kitchen and bath replacements without structural changes) is the natural progression. Full guts should come only after you have a trusted general contractor, reliable cost estimation, and capital reserves to absorb surprises.
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