On a house hack that pencils well while you live in it and poorly once you leave, which number should govern the buy

Question

Take a side by side duplex at 429k, 5 percent conventional owner occupied. PITI plus MIP lands around 3,150. One side rents at 1,750, with market supporting maybe 1,800 on turnover. While living in it, the owner is out of pocket about 1,380 a month, roughly 380 above what a comparable one bedroom rental would cost. Once the owner moves out and rents their side at 1,800, gross runs 3,550 against 3,150, about 400 before anything else. Take out 8 percent vacancy and 8 percent maintenance and the property runs roughly 190 negative a month with zero reserve set aside for a roof an inspector might flag as four to seven years out. The live-in year on numbers like these is genuinely good, cheaper than renting once principal paydown is counted. The post-move-out year, taken on its own, is a rental that would not clear underwriting standing alone. The useful frame is that a house hack is really two separate holds stitched together by occupancy, and the decision to keep it past year one should be made on whether the standalone rental numbers work with a real reserve built in, not on the memory of how good year one felt.

Rena Expert · Accepted Answer

You buy on the number you'll be living with longest, and unless you're planning to occupy that unit for a decade, that's the 190 negative. But your post-move-out figure is built on a fixed payment against rents you've assumed static, which is the part I'd push on before deciding.

Run it forward. At 3 percent rent growth, 3,550 gross becomes about 3,880 in three years and roughly 4,110 in five. Your PITI moves with taxes and insurance, not with principal and interest, so call it 3,150 growing to maybe 3,350 on tax and insurance drift. That flips negative 190 into modestly positive somewhere around year three or four on those assumptions. The whole case rests on rent growth continuing in your specific submarket, and if it stalls you own a property that eats 2,300 a year plus a roof.

The roof is the item you've handled worst. Four to seven years on a duplex is not a reserve line, it's a scheduled capital event, probably 15k to 25k depending on square footage and material. Add 300 a month against it and you're negative 490, which changes the question. Either price that into your offer now or get a contribution at closing, because you won't have refinance equity to draw on at 5 percent down.

The other thing your model skips: 8 percent maintenance on a building where you're the occupant is not the same 8 percent once you're a remote landlord fielding calls on both sides. Turnover costs on the unit you vacate tend to run higher than owners expect because you've been living in it, not maintaining it as a rental.

If the seller won't move on price, the honest read is that you're paying for one cheap year and buying a mediocre rental to get it.

On a house hack that pencils well while you live in it and poorly once you leave, which number should govern the buy

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