How to Use Comparative Rent Analysis for BRRRR Deals

For BRRRR (Buy, Rehab, Rent, Refinance, Repeat) deals, the rental income determines whether the property cash-flows after refinancing, which is the make-or-break metric. Accurate rental comps are essential.

Sources for rental data include Zillow Rental Manager (active and recently rented listings), Rentometer (aggregates data from multiple sources), Craigslist and Facebook Marketplace (real-time asking rents), local property management companies (they know achieved rents, not just asking rents), and county housing authority fair market rents (baseline for the area).

Selecting rental comps follows similar principles to sales comps. Find properties within 0.5 miles that are similar in size, age, bedroom/bathroom count, and condition. Recent data (within the last 6 months) is most relevant. Look for at least 3–5 comparable rentals.

Adjust for key differences. An extra bedroom typically adds $100–$200/month in rent. In-unit laundry adds $50–$100/month. A garage adds $50–$150/month. Updated finishes add $100–$200/month over unrenovated units. Adjust your estimate based on how your post-renovation property compares to the rental comps.

The critical calculation is the DSCR after refinancing. Estimate the refinance loan amount (typically 75% of the new appraised value), calculate the monthly payment at current rates (use a 30-year fixed rate for projections), add monthly taxes, insurance, and any HOA dues, then compare total monthly costs to expected rental income. The rent should cover at least 100–125% of the total monthly obligation.

Don't forget vacancy allowance (budget for 5–8% annual vacancy), maintenance reserves (budget 5–10% of gross rent), and property management fees (8–10% of gross rent, even if you plan to self-manage initially — it should work with management for scalability).

A property that cash-flows $200–$400/month after all expenses provides solid returns and a comfortable buffer against unexpected costs.