What to do when there are no rent comps within 15 miles of a duplex

Question

Take a small town market, a two-unit frame building asking 145k. Both sides are 2/1, in-place rents at 700 each with market closer to 750. At 3.5 percent down that is roughly 140k financed, with taxes and insurance penciling near 1,150 a month all in. One tenant's rent covering a bit over 60 percent of that is the manageable-payment outcome most house hacking guidance targets. The documentation problem is common in these markets. A lender wants a rent schedule from the appraiser to use any rental income for qualifying, and in a county where most rentals are single family houses rented by handshake and never listed anywhere, an appraiser may report there are almost no rented two-unit comps to pull. The same wall shows up with a one-unit property carrying a permitted basement apartment, where an ADU income policy could help on qualifying but runs into the identical lack of market rent evidence. The working answer in practice: ask the appraiser to pull single family rental comps and adjust, request a longer-form rent survey rather than a standard schedule, or have the lender's underwriter accept a signed lease plus a broker price opinion on rent as supporting evidence when the standard form has nothing to draw on. Whether that path differs between a straight two-unit and an ADU income scenario usually comes down to the specific lender's overlays, so it is worth asking the loan officer directly which of those routes their investor will accept before assuming either is closed.

Rena Expert · Accepted Answer

Two different mechanisms, so separate them.

On the two-unit, the rent schedule the appraiser produces is a form with a small grid of comparable rentals plus the appraiser's opinion of market rent. Appraisers in thin markets routinely reach outside the immediate area and adjust for location, and they can use signed leases, property manager surveys, and rentals they know of that were never publicly listed. Your job is to hand them evidence rather than hope they find it. In-place leases at 700, a written statement from a local manager on what a 2/1 rents for, and any listings you can screenshot from the nearest town all go in the file. If the appraiser still won't support market rent, ask your lender in writing what they'll do with the actual executed leases at 700, because guidelines and lender overlays differ on whether in-place rent alone can be used.

The ADU case is tighter. The Fannie policy lets projected ADU rent count toward qualifying income on a one-unit owner-occupied purchase, capped at 30 percent of total qualifying income, and that projection has to be appraisal-supported. No supportable market rent means no income, and the cap means a big number wouldn't rescue you anyway. Confirm the current version of the rule and the lender's own overlays before you write an offer that only works with that income.

The thing that would worry me more than either is your vacancy math. At 1,150 a month all in, one unit empty in a county where you might wait 60 to 90 days for a tenant is a real hole, and a permitted basement apartment can also collide with local occupancy or egress rules that don't care what the appraiser wrote. Verify the ADU's permit status with the building department yourself.

karen_whitfield · Answer

Thin comps cut both ways and I'd sit with that before I solved the qualifying question. If there's no rent data, there's probably not much sale data either, and a 145k two-unit in a county with four transactions a year is a hold, not a thing you sell when you need to. I own land in markets like this on purpose. The math works and the exit is measured in seasons.

brandonlee36 · Answer

Adding to the evidence pile idea: ask the local housing authority for its payment standards. The figure measures something different from market rent, though it is a published number tied to unit size and county, and appraisers in thin markets have used it as a sanity check when the private-market grid is empty. Worth a phone call, and it costs nothing.

renee_dubois · Answer

A 700 in-place rent against 750 market on a rural 2/1 is a 7 percent gap and it is not worth buying on. Half the time the reason in-place rent is under market in a small town is that the tenant has been there nine years and the shower valve is original. Get both leases, get the ledger if there is one, and price a turn on each side at 3k to 5k, because you will be doing them sooner than the pro forma says.

tonyv88 · Answer

One more file item for the appraiser. A property manager's rent roll summary with unit type, square footage and current rent, addresses stripped, is a document appraisers have accepted as a manager survey. If there is anyone managing anything in @laurenkim53's county, that document exists in their software and takes ten minutes to export.

tylerbrooks9 · Answer

Honestly the two-unit sounds like the calmer of the two options. Both sides are already rented with income you can see, and you are only asking the appraiser to confirm something that is already happening. The ADU route needs a permit check and an appraisal opinion to line up with a policy cap before you even own it. The boring building at 1,150 with 60 percent covered is the stronger position.

What to do when there are no rent comps within 15 miles of a duplex

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