DSCR Loan With an Unpermitted ADU: Will the Income Count?

Value-add investors targeting properties with detached garage apartments, basement units, or backyard cottages face a consistent friction point with DSCR financing: if the secondary unit is unpermitted, the income it generates may not count toward the DSCR calculation — or may count partially, inconsistently, or at a haircut that changes the deal economics. This article explains exactly how appraisers and lenders treat unpermitted ADU income, what documentation helps, and what due diligence steps to run before you make an offer. For broader context on how DSCR is calculated, see what is a DSCR loan.

What “Permitted” Actually Means — and Why Lenders Care

An accessory dwelling unit is “permitted” when the local jurisdiction has approved it as a legal dwelling unit — meaning it has gone through plan review, passed inspections, and appears on the county assessor’s records as a habitable unit. What lenders care about is not primarily the permit itself, but what the permit represents: a unit that can be legally marketed as a rental and that the appraiser can include in a market rent analysis without legal exposure.

Lenders care about two risk scenarios. First, a municipality could issue a notice to vacate an unpermitted ADU, eliminating the income stream the loan was underwritten on. Second, an appraiser who includes income from an unpermitted unit in a 1007 rent schedule is making a valuation claim that may not hold if the unit is later forced to cease operations. Both scenarios create collateral risk.

This does not mean unpermitted ADU income is always excluded. It means the lender’s decision is a function of their risk tolerance for the specific permitting posture and jurisdiction — which is why lender selection matters as much as documentation quality.

How Appraisers Handle Unpermitted ADU Income on Form 1007

The Form 1007 (Single Family Comparable Rent Schedule) is the standard income document for DSCR loans on 1–4 unit properties. The appraiser inspects the property, reviews comparable rents in the market, and provides a market rent opinion that becomes the income input for the DSCR calculation.

When an ADU is unpermitted, the appraiser has three practical options:

1. Include the ADU rent in the market rent estimate — if the jurisdiction treats unpermitted ADUs permissively (as in California post-SB-9 or certain Texas counties), the appraiser may include the income, noting the ADU’s status. The appraiser takes on professional liability for this judgment.
2. Include the ADU at a haircut — the appraiser values the ADU as if it were a storage unit or informal rental, applying a discount to reflect the permitting risk. This produces partial income credit.
3. Exclude ADU income entirely — the appraiser values only the primary structure. This is the most common outcome when the ADU has no separate utility metering, no distinct entrance, or when county records show the structure as non-residential.

The appraiser does not make this decision in a vacuum. The lender’s appraisal desk will review the 1007 and may instruct the appraiser to revise the income estimate if it includes income from an unpermitted structure they are not comfortable with. This review process is why deals sometimes arrive at underwriting with a 1007 that looks favorable and then get revised downward.

The 4 Lender Stances on Unpermitted ADU Income

Different lenders have different policies for how they treat an unpermitted ADU that appears in the appraisal. Based on current programs in our network:

The range of outcomes — from full credit to outright decline — for the same property illustrates why this is a lender-selection problem, not just a documentation problem.

Documentation That Helps Move Lenders to More Favorable Stances

When an unpermitted ADU has a documented rental history and physical characteristics that resemble a legal unit, lenders and appraisers are more likely to credit the income. The following documentation helps:

• Rental history: 12 months of signed leases or month-to-month agreements for the ADU, with matching bank deposit records
• Photographs: Interior and exterior photos establishing the ADU as a habitable, distinct unit — separate kitchen, bathroom, entrance
• Separate utility metering: A distinct electric or gas meter for the ADU is one of the strongest indicators that the unit operates independently
• County assessor records: Even if the ADU isn’t permitted as a dwelling, a county record that describes the structure as “garage with living quarters” or “accessory building” supports its existence
• Code enforcement history: A property with no history of code violations or stop-work orders is cleaner than one that has been flagged

None of these guarantee that a lender will count the income. They reduce the probability of a full exclusion and shift the conversation from “this unit exists” to “this unit has operated as a rental productively.”

State Dynamics: California, Florida, and Texas

California. SB 9 (2022) and subsequent ADU legislation have dramatically lowered permitting barriers in California. Many ADUs that were unpermitted before 2020 can now be brought into compliance through a simplified permit process, often without meeting current setback requirements if the structure predates a certain date. California lenders who are familiar with ADU activity in the state are more likely to credit unpermitted ADU income — particularly in high-cost markets where ADU rents are material.

Florida. Florida passed its own ADU legislation in 2023 (HB 1417), which requires municipalities to allow ADUs in single-family zones. However, unpermitted ADUs built before the law still require retroactive permitting through local building departments. In South Florida markets with dense value-add activity, lenders are increasingly familiar with the permitting timeline and may allow the deal to proceed with a permit-pending note in the file.

Texas. Texas has no statewide ADU law, so permitting rules vary widely by municipality. Austin has streamlined ADU permitting; Houston has minimal zoning restrictions and a relatively investor-friendly approach; Dallas and San Antonio are more variable. For a Texas property with an unpermitted ADU, the county-level permitting posture matters more than the state-level framework.

Pre-Offer Due Diligence Checklist

Before writing an offer on a property with a potentially unpermitted ADU, work through the following steps:

1. Pull the county assessor record. Confirm how the ADU is classified — dwelling, garage, accessory structure, or not appearing at all. A unit that doesn’t appear on the assessor record is the hardest to underwrite.
2. Check the county permit history. Most counties have online permit search tools. Look for any building permits on the secondary structure. A permit for “garage conversion” that was opened but never finaled is a common scenario.
3. Verify utility metering. Ask the seller’s agent for the utility account list. Separate meters signal a more defensible rental unit.
4. Request the seller’s rent roll. If the ADU has been rented, get the leases and bank statements. This documentation goes directly to the lender.
5. Check municipal short-term-rental ordinances. Some investors plan to use an ADU as an MTR. Confirm that the municipality allows short-term or mid-term rentals in the zone before building that into your DSCR model.
6. Research the local permitting timeline. If you plan to permit the ADU post-close, call the building department before you’re under contract to get a realistic estimate — 6 weeks in Texas versus 18 months in a California coastal city changes your refinance timeline materially.
7. Get a lender pre-opinion. Share the listing address and available documentation with a DSCR broker before you’re under contract. We can tell you in 24 hours which lenders in our network will credit the ADU income — and at what percentage.
8. Model the deal at zero ADU income. Even if you plan to fight for full income credit, confirm that the deal works on senior-unit-only DSCR. If it doesn’t, you’re taking deal risk that the right lender may not be able to offset.

For cases where you’ve already been denied and are working to fix the income calculation, see our article on why DSCR loans get denied and how to fix them.

What This Means for Value-Add Investors

The unpermitted ADU scenario rewards investors who do their diligence early. The same property can produce a DSCR of 1.30 at one lender and 0.90 at another, based solely on how each handles the ADU income. Getting that answer before you’re under contract — or at least before you waive your financing contingency — is the difference between a deal and a problem.

Send us the listing — we’ll tell you in 24 hours whether the ADU income will count at lenders in our network. Submit your scenario at /get-matched/ with the property address and any available documentation, and we’ll match you with the programs most likely to produce the best DSCR calculation for your specific unit.

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