Most investors take too long to analyze deals or not long enough. Too long means analysis paralysis and losing good properties to faster buyers. Not long enough means buying on feeling and discovering the numbers do not work after closing.
A disciplined investor can determine whether a deal deserves serious attention in 30 minutes and whether it deserves an offer in another 30. Here is the framework.
Phase one: the 10-minute screen
Before you open a spreadsheet, run three quick filters:
The rent-to-price ratio. Divide monthly gross rent by purchase price. If the result is below 0.6%, walk away unless you have a specific thesis about appreciation or value-add potential. A $350,000 single-family property needs to rent for at least $2,100/month to survive basic scrutiny.
The neighborhood. Look at a 12-month sales map. Is median price trending up, flat, or down? Check vacancy rates for rentals in the area using local property management company websites or Zillow's market data. A high-yield property in a declining neighborhood is a value trap.
The property condition. Use Google Street View before scheduling any showings. Is the exterior maintained? Are neighboring properties maintained? Deferred exterior maintenance is almost always a symptom of deferred everything else.
If the deal clears these three filters, it deserves a proper look.
Phase two: the numbers (20 minutes)
Build a simple income statement. You need the following inputs: gross monthly rent, purchase price, down payment percentage, interest rate, property taxes, insurance cost, and any HOA fees.
Calculate monthly mortgage payment using any standard amortization calculator. Then layer in your operating expense estimates: - Vacancy: 6% of gross rent - Property management: 10% of gross rent (even if self-managing - this preserves optionality) - Maintenance: 1% of purchase price per year divided by 12 - CapEx reserve: 7% of gross rent
Subtract total monthly expenses and mortgage from gross rent. What remains is monthly cash flow. Annualize it and divide by your total cash invested (down payment plus closing costs plus any immediate repairs) to get cash-on-cash return.
Target returns vary by market and investor. As a rough guide: below 5% cash-on-cash in a flat market is difficult to justify. 6-8% in a stable market is reasonable. Above 8% usually indicates either a great deal or a problem you have not found yet.
Phase three: the site visit (30 minutes)
Numbers on paper are preliminary. The site visit either confirms your analysis or changes it. Focus on:
Roof condition. A roof replacement on a mid-size single-family property costs $8,000-15,000. Ask the age. Inspect from the ground with binoculars if needed. A roof needing replacement within three years needs to be reflected in your offer price.
HVAC condition. Furnace replacement: $4,000-8,000. Central air unit: $3,500-7,000. Ask for maintenance records. Systems older than 15 years should be budgeted for replacement.
Foundation and drainage. Water in the basement or crawl space is a major red flag. Look for efflorescence (white mineral deposits on concrete walls), fresh paint over damp areas, and grading that directs water toward the foundation rather than away from it.
Electrical panel. Knob-and-tube wiring, aluminum wiring, or a Federal Pacific Stab-Lok panel are all significant insurance and safety issues. Upgrading a panel runs $2,500-5,000.
Note every significant item and update your repair cost estimate. Adjust your offer accordingly.
The offer math
If the deal still works after the site visit, calculate your maximum offer. Work backward from your target cash-on-cash return.
Target annual cash flow / target cash-on-cash return = maximum total cash invested Maximum total cash invested minus estimated closing costs minus immediate repairs = maximum down payment Maximum down payment / down payment percentage = maximum purchase price
If the list price is below your maximum, you have room to offer at or near list. If it is above, you know exactly how far below list you need to go to make the deal work.
BiggerPockets' deal analysis tools offer free calculators that automate this process. The math is the same whether you do it in a spreadsheet or a purpose-built tool.
This article is for informational purposes only and does not constitute financial, legal, or tax advice. Consult a qualified professional before making investment decisions.
