Let’s get one thing straight — buying a property, slapping on some paint, and collecting rent doesn’t make you a real estate mogul.
What does? Knowing your numbers. Specifically, your ROI.
And if you're playing the BRRRR game (Buy, Rehab, Rent, Refinance, Repeat), calculating ROI isn't optional — it's survival.
It’s not just a sound you make when the AC’s too high. It’s a real estate strategy that’s basically the blueprint for wealth-building on a loop:
Buy – Find a beat-up property that smells like potential (and maybe mold).
Rehab – Fix it up so it doesn’t scare off tenants or lenders.
Rent – Get that monthly cash flow rolling in.
Refinance – Pull out your equity based on the new value.
Repeat – Rinse, repeat, get richer.
Simple to understand. Easy to screw up — especially if you ignore ROI.
Depends on your market, risk appetite, and whether you actually like sleeping at night. But here’s a cheat sheet:
Cash-on-cash return: Aim for 8–12%
Cap rate: 4–10%, depending on risk
Total ROI: 15%+ annually is the sweet spot
1% rule: Rent should be at least 1% of the purchase price
50% rule: Expect half your rent to go into operating expenses
Let’s get down to the numbers. Here's the step-by-step breakdown for calculating ROI on a BRRRR deal:
Purchase Price
Stamp Duty & Legal Fees
Rehab Costs
Other fees (surveyor, broker, mortgage origination, etc.)
🧠 Total Investment = All-in money spent before rental income starts
Let’s say your rent is £1,200/month, but your property manager takes 10% = £120.
You're left with:
£1,080/month
Now subtract other regular costs:
Maintenance: £50
Insurance: £30
Misc: £40
Total Costs = £120
Net Income = £1,080 - £120 = £960/month
Net Annual Income = £960 × 12 = £11,520
Rental ROI (%) = (Net Annual Income ÷ Total Investment) × 100
Let’s say you put in £178,000 total.
Rental ROI = (£11,520 ÷ £178,000) × 100 = 6.47%
Post-rehab, property’s now worth £200,000.
You bought it at £150,000.
That’s £50,000 in appreciation.
So...
Overall ROI = ((£11,520 + £50,000) ÷ £178,000) × 100 = 34.63%
Now we’re talking.
Market conditions — A downtrend eats your appreciation alive
Shoddy rehab — Over-budget and underwhelming = nightmare combo
Weak rental demand — No tenants, no cash flow
Crap loan terms — High interest = low returns
Poor management — Bad tenants, missed rent, surprise repairs — say goodbye to profit
Hunt down undervalued properties in rising neighborhoods
Budget like a psycho during rehab
Price your rent strategically, not emotionally
Refinance only when value peaks
Build a reliable crew (contractors, agents, lenders — the Avengers of real estate)
BRRRR is more than a catchy acronym. It’s a weapon — but only if you know how to calculate and optimize your ROI.
So the next time someone tells you they’re BRRRRing their way to wealth, ask them one question:
“Cool. What’s your ROI?”
If they can’t answer, they’re not investing. They’re just renovating and praying.
Want the cheat codes to find undervalued properties before anyone else? Our guide on sourcing killer BRRRR deals drops next week. Stay tuned.