Investor Guide
How to analyze a rental property honestly
Five inputs decide whether a rental works. People get two of them wrong almost every time.
How do you analyze whether a rental property is a good investment?
Work from five inputs: realistic market rent, a real repair basis, full operating costs including taxes at the post-sale assessment, financing terms you can actually get, and a credible exit. The two that most often sink a deal are an optimistic rent estimate and a repair budget built from a per-square-foot rule of thumb rather than an actual scope. Pressure-test both before you offer, and be suspicious of any analysis where every assumption happens to point the same way.
Key Takeaways
- Rent is the input everything else scales from. Get it from actual leased comparables, not an automated estimate.
- Repairs need a scope, not a rule of thumb. Roof, HVAC, electrical panel, sewer line, foundation.
- Underwrite taxes at the reassessed value, not the seller's current bill.
- If every assumption in a deal happens to break in your favour, you are not analysing, you are hoping.
1. Rent, and why it is usually wrong
Everything else in the model scales off this number, which is exactly why it gets inflated. An automated estimate has never seen the property, does not know the layout is awkward, and cannot tell that the comparable two streets over backs onto a school rather than a road.
What you want is what genuinely comparable units leased for recently — not what they were listed at — and how long they took to lease. A property that leases at your number in ten days and one that takes ninety days to get there are completely different investments, and only one of them shows up in a spreadsheet cell.
2. The repair basis
Per-square-foot rules of thumb are how people end up $20,000 short. Build a scope instead, and price the five things that actually move the number:
- Roof — age and remaining life, and whether a claim has already been made on it.
- HVAC — age of the unit. Replacement is a known, large number.
- Electrical service — panel type and capacity. Some older panels are an insurance problem, not just an electrical one.
- Sewer line — on older stock, scope it. Cast iron and clay lines fail, and a replacement can erase a year of cash flow.
- Foundation — Oklahoma's soils move. Get a real opinion where there is any sign of movement.
3. Operating costs people forget
- Taxes at the new assessed value, not the seller's current bill.
- Insurance quoted for real, with attention to percentage-based wind and hail deductibles.
- Vacancy at a rate you would defend to someone sceptical.
- Turnover — paint, flooring, cleaning, leasing, and vacant weeks.
- Capital reserves for the roof and HVAC you know are coming.
- Management, even if you self-manage. Your time is a real cost, and if you ever stop self-managing the deal has to still work.
4. Financing you can actually get
The terms in your model need to be terms a lender will really offer you, for this property, in this condition. Low-balance loans on inexpensive houses are harder to place than their price suggests — which matters a great deal in the cheaper parts of this metro. A model built on financing you cannot obtain is fiction.
5. The exit
Who buys this from you in five or ten years, and can they get a loan on it? A property that only ever sells to a cash buyer is worth less than one that a retail buyer could finance, and that difference belongs in your analysis today, not as a surprise later.
Pressure-testing someone else's numbers
When a wholesaler or a seller hands you an analysis, check four things before anything else:
- Is the rent figure from leased comparables, or from listings and estimates?
- Is the repair number a scope, or a round figure?
- Are taxes at the current bill or the likely reassessment?
- Is there a vacancy and capital reserve line at all?
If all four break in the direction that makes the deal look good, that is not bad luck. That is the analysis being built backwards from a conclusion.
We will run this on a specific property with you, including on a deal you found elsewhere. That is what our valuation and deal analysis work is.