Idaho real estate glossary

How does the BRRRR strategy utilize the 70% rule for rental properties?

In the BRRRR (Buy, Rehab, Rent, Refinance, Repeat) strategy, the 70% rule serves as a conservative underwriting benchmark to ensure an investor does not overpay for a property. By purchasing at or below 70% of the After-Repair Value (ARV) minus estimated repair costs, investors create a sufficient equity cushion. This margin allows them to finance the acquisition and renovation, then perform a cash-out refinance that recoups their initial capital investment—down payment and renovation costs—for use in the next deal.

Updated with grounded research as of 2026-10-06.

The short answer

The 70% rule is a critical underwriting guideline used by real estate investors to ensure that a property purchased for the BRRRR strategy has enough equity margin to facilitate a successful cash-out refinance. By capping the purchase price and renovation costs at 70% of the property's anticipated After-Repair Value (ARV), investors protect themselves against appraisal gaps and transaction costs, maximizing the likelihood of recouping their initial capital.

Key facts

The 70% Rule Formula
Maximum Purchase Offer = (After-Repair Value [ARV] × 0.70) − Estimated Repair Costs
Purpose of the 30% Margin
The remaining 30% of the ARV is designed to cover transaction costs (closing costs, commissions, holding costs), unexpected renovation overages, and a built-in profit margin to ensure the deal remains viable after a cash-out refinance.
Role in Refinancing
Because many lenders limit cash-out refinances to a specific loan-to-value (LTV) ratio (often 75%), adhering to the 70% rule helps ensure that the appraised value post-rehab is high enough to pull out the majority of the investor's original cash investment.

Understanding the Equity Cushion

The primary objective of the 70% rule is to create a safety buffer. In the Idaho real estate market, as elsewhere, accurate estimation of the After-Repair Value (ARV) is vital. If an investor purchases a property too close to its market value, any fluctuations in the market or unforeseen renovation costs can quickly erode the potential for a cash-out refinance.

  • Provides a margin of error for construction overages.
  • Offsets closing costs and lender fees associated with the refinance.
  • Ensures the investor is not 'over-leveraged' once the property is stabilized.

The Relationship Between LTV and the 70% Rule

Lenders perform a cash-out refinance based on the appraised value of the property after renovations are complete. If an investor uses a hard money loan or cash to acquire and fix the property, they look to a conventional lender to provide long-term financing (the 'Refinance' step). If the investor's total 'all-in' cost (purchase + rehab) is 70% or less of the appraised value, a lender providing a 75% LTV refinance can typically cover the total investment, allowing the investor to recoup their initial cash.

  • Lenders rarely finance 100% of the ARV.
  • A lower cost basis relative to ARV makes it easier to meet lender LTV requirements.
  • Success relies on the final appraisal reflecting the work completed during the 'Rehab' phase.

Strategic Application in Competitive Markets

While the 70% rule is a standard benchmark, it is a guideline, not a regulatory requirement. In highly competitive markets, some investors may find that properties are trading at premiums that make a strict 70% rule difficult to achieve. In these scenarios, investors must weigh their risk tolerance against the potential for long-term cash flow and appreciation.

  • Market conditions may dictate higher purchase prices.
  • Investors might adjust the target to 75% or 80% if rental yields remain strong enough to justify the additional upfront capital.
  • Always prioritize accurate ARV data over arbitrary percentages.

Common questions

Is the 70% rule a law in real estate investing?

No. It is a conservative underwriting tool used to manage risk. It is not a legal mandate, and investors should adjust their strategies based on current local market data, interest rates, and individual risk tolerance.

What happens if I overpay and don't meet the 70% rule?

If you overpay for a property, you may find that the appraised value is not high enough to facilitate a full cash-out refinance. This results in 'trapped equity,' meaning you will leave a portion of your initial capital in the deal, reducing your ability to 'Repeat' the strategy quickly.

Related Idaho questions

  • What is the 'seasoning period' required before refinancing a BRRRR property?
  • How do you accurately calculate After-Repair Value (ARV) for a property?
  • What are the risks of using the 70% rule in hot real estate markets?

Sources and verification