Your ADU's "80% Return" After the Loan Payment: The Orange County Math

Where that big return number quietly cheats

The return people quote almost always assumes one thing they never say out loud: that you had the cash sitting in the bank. Pay for the whole unit up front, rent it out, and sure, the math looks great.

But almost nobody in Conway or Azalea Park has a hundred-grand-plus just parked in checking. They pull it out of the house — a line of credit, a cash-out refinance, a construction loan. The second you do that, you've added a monthly bill the rosy version never counted. So the real question isn't what the ADU earns. It's what's left after the loan takes its cut.

The rent check comes in the front door and walks out the back

A one-bedroom around Orlando rents for somewhere near sixteen hundred a month right now. Feels like real money landing in your account.

Then the loan payment takes most of it. Property taxes tick up because the lot's worth more. Insurance climbs. One month a year the place sits empty while you repaint and re-list, and the water heater always seems to quit on a holiday weekend. When the dust settles you're not pocketing the rent — you're pocketing the sliver that's left, maybe a couple hundred bucks in a good month.

So the return didn't vanish. For the first stretch of years the bank is just holding most of it, one payment at a time.

The part of the return that never shows up as cash

Here's what the monthly number misses. Every one of those payments is chipping the loan down, so a slice of that "lost" rent is quietly turning into equity you own. A permitted second unit usually bumps what the whole property is worth when you sell. And the person back there doesn't have to be a stranger.

That last one is why a lot of Orange County owners build at all. Through Ready Set Orange, people in unincorporated parts of the county have been putting up small units for an aging parent — mom in the backyard in Rio Pinar instead of a facility across town. The rent return on that is zero. Most of them would tell you it's the best money they ever spent.

So before you let a commenter talk you out of it with a cash-flow number, get clear on which return you're actually after.

Whether the math works comes down to your exact lot

None of this runs the same on two properties. A unit that ties into the sewer pencils out one way; one that needs its own septic drainfield pencils out another. Your electrical panel might handle a second unit, or it might need an upgrade first. Setbacks, lot size, how much equity you've really got, and whether you're in unincorporated Orange County — where Ready Set Orange lives — or inside a city like Winter Garden with its own rulebook: all of it swings the number.

That's what the ADU Fit Check is for. You put in your address and your situation, and it tells you whether your lot is one where the math still leaves you ahead after the loan payment — before you call a single lender. Start there, then go argue with the commenters.

Common questions

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