Often, yes. DSCR programs can finance a property that includes an accessory dwelling unit (ADU), but whether the ADU's rent counts toward the debt service coverage ratio depends on the program, the appraisal and the unit's legal status. Lenders typically look at whether the ADU is permitted under local zoning, whether the appraiser can support its rent with comparable rentals, and whether the property is treated as one unit with an ADU or as a two-unit property. Requirements vary by lender and program, so confirm how the ADU will be treated before relying on its rent.
A DSCR loan qualifies a property largely on its rent compared with its housing payment, so whether the ADU's rent is included can change the debt service coverage ratio. Some programs count rent from both the main home and the ADU. Others count only the primary dwelling, or count ADU rent only when certain conditions are met. Guidelines vary by lender and program, and it is worth running the numbers both ways in the DSCR calculator.
Market rent is usually supported by the appraisal. The appraiser completes a comparable rent schedule using rentals similar to the unit. FHA's appraisal guidance, for example, asks appraisers to include a comparable that is a single-family home with a rented ADU where one is available (HUD Mortgagee Letter 2023-17).
When the ADU is already rented, the lease and the appraiser's market rent may not match. Fannie Mae's guidance for its own loans has the lender explain the difference or use the lower amount (Selling Guide B3-3.8-02). DSCR programs set their own rule for which figure applies, so ask which one will be used.
Beyond the standard DSCR loan requirements, an ADU adds a few questions of its own:
An ADU sits on the same parcel as the main home and is subordinate to it; HUD describes the two together as a single interest in real estate (HUD Mortgagee Letter 2023-17). A property with a second full unit may instead be a two-unit property. Under FHA guidance the appraiser decides which classification fits as part of the highest and best use analysis, and Fannie Mae points to factors such as separate utility meters, a separate postal address and whether the unit can be legally rented (Selling Guide B4-1.3-05).
For a DSCR loan, the classification can change which program applies, which appraisal form is used (a one-unit appraisal with a comparable rent schedule, or a small residential income property appraisal) and how rent is counted. Programs treat one-unit properties with an ADU and two-unit properties differently, so ask how the property will be classified before the appraisal is ordered.
Some investors rent an ADU by the night or the week. How short-term rental income is treated varies by DSCR program: some use short-term rental history or market data, some count only long-term market rent, and some may not count it. FHA's guidance excludes transient rentals when appraisers develop an ADU's market rent (HUD Mortgagee Letter 2023-17), which is one reason an appraisal can show a long-term rent figure for a unit that earns more as a short-term rental. Local short-term rental rules can also limit how an ADU is used.
DSCR loans generally finance a completed, rentable unit, because the ratio is based on rent the property can earn. Construction is typically financed another way, such as a construction or renovation loan or cash, and a DSCR loan follows once the unit is finished, approved for occupancy where required, and rented or ready to rent.
It can. Some DSCR programs include market rent from an ADU in the ratio, usually when the appraisal supports it and the unit can be legally rented. Others count only the primary dwelling's rent. Guidelines vary by lender and program, so ask how the ADU's rent will be treated before relying on it.
It is less likely. Lenders and appraisers typically look at whether an ADU can be legally rented, and an unpermitted unit may receive little or no rental credit even if it is occupied. Some programs may still finance the property while counting only the main home's rent. The local planning or building office can confirm a unit's status.
It depends on the property and the appraisal. A single ADU that is subordinate to the main home is generally treated as part of a one-unit property, while a second full unit can make it a two-unit property. The appraiser's analysis and the lender's program determine which classification applies.
Usually not directly. DSCR loans generally finance a finished, rentable property, so construction is typically funded another way. Once the ADU is complete and rented or ready to rent, a DSCR loan may be used to refinance the property based on its rent.
It can. The appraiser looks at how the local market values homes with ADUs, using comparable sales where they exist. How much an ADU adds depends on the market, the quality of the unit and whether it is legal, and in some areas the effect is modest.
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