The Quick Read: A casita’s rent helps a DSCR cash-out only when the unit is legal, the appraiser supports a market rent for it, and your paperwork tells one consistent story. The lender, not you, decides how much of that rent counts. Build the file before the appraisal is ordered, because most gaps cannot be fixed afterward.
- Prove legal status first: permit, final inspection or certificate of occupancy, and zoning confirmation.
- Expect the appraiser’s market-rent opinion to anchor the number, with your lease as supporting evidence.
- On a cash-out, the casita affects both leverage (value) and coverage (rent), so the lowest-supported figure wins.
- Clearing 1.00 on coverage is not the same as positive cash flow, since repairs, vacancy and management sit outside the ratio.
Does Casita Rent Count Toward DSCR at All?
Sometimes. A detached casita’s rent counts only when the lender’s program accepts it, the unit is lawful for rental use, and the appraisal supports it. Nothing about it is automatic.
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DSCR compares the property’s rent used for lender review to its full monthly obligation: principal, interest, taxes, insurance and any HOA dues, together called PITIA. If the casita’s rent is not counted in the top of that fraction, it does nothing for your ratio.
DSCR loans are designed for non-owner-occupied investment properties. Because they are business-purpose investor loans, they are reviewed differently from a standard owner-occupied mortgage. That is why the property’s rent carries so much weight, and why a casita you cannot document is simply a nice building to the lender.
Across the wholesale network Lendmire works with, 1.00 is where many select programs start, and stronger coverage opens better pricing and leverage. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted. Either way, a casita you cannot document may change which path fits.
Key Terms Defined
Casita: A small, separate dwelling on the same lot as a main house, usually with its own bath and sleeping area, and ideally a kitchen.
ADU (accessory dwelling unit): The formal name for a second, independent living unit on the same parcel. A legal ADU has a permit trail.
Rent schedule (Form 1007): The appraisal exhibit where the appraiser estimates monthly market rent from comparable rentals.
Form 1025: The appraisal report for two-to-four-unit properties, which builds unit-level rent into the report.
PITIA: The monthly principal, interest, taxes, insurance and association dues on the loan.
Seasoning: The waiting period after you buy before you can do a cash-out. On most programs we place, that is about 6 months from the date title was recorded.
Rent used for lender review: The rent figure the lender counts when calculating the DSCR, which may differ from the rent stated in your lease.
How Does Underwriting Treat Casita Rent, Step by Step?
Underwriting runs in a set order. Each step can remove the casita’s rent from the file, so do them in sequence.
Step 1: Classify the property. A single-family home with a detached casita is usually appraised as a one-unit property with an accessory unit. The rent opinion normally comes from Form 1007 attached to the main appraisal. According to McKissock Learning, an appraiser-education provider, Form 1007 collects data from comparable one-unit rentals, while Form 1025 covers duplexes through fourplexes. A two-to-four-unit classification generally applies only when the casita is legally a separate unit.
Step 2: Prove legal status. Gather the permit, final inspection or certificate of occupancy, and any local zoning or ADU letter. For an older unit, add legal-nonconforming documentation if it exists. Check insurance and any HOA or deed restrictions that govern separate rentals.
Step 3: Make the physical facts match. The listing, appraisal, insurance policy and lease should all describe the same square footage, bedroom count and utilities. Mismatches invite conditions, or a decision to ignore the income altogether.
Step 4: Add lease and payment evidence. A signed lease, tenant application and one or two months of rent deposits support the rent. They are supporting documents. They are not the coverage figure.
Step 5: The appraiser sets the market-rent opinion. Comparable rentals are adjusted for differences, and you do not supply the figure. Give the appraiser your permit paperwork and lease before the visit, not after.
Step 6: The lender picks the counted figure. Many programs in our network underwrite on the lower of the in-place lease rent or the appraiser’s market rent. Some lenders may count the casita at lease, at market, or not at all. A few will treat it differently depending on the property type.
How Do You Document Detached Casita Rent? The File Package
Think of the package as five folders. A strong file makes the casita easy to say yes to.
| Document | What it proves | Common mistake |
|---|---|---|
| Permit and final sign-off | The unit is legal | Handing over only a drawing |
| Signed lease | Terms and in-place rent | Lease names a different unit size |
| Rent deposits | The tenant actually pays | Deposits not tied to the address |
| Photos and unit description | Kitchen, bath, entrance | Description conflicts with the listing |
| Insurance declarations | The structure is covered | Policy omits the casita |
Two details trip up many files. First, if the casita shares a utility meter or address with the main house, say so in the lease and expect questions. Second, if the casita is leased together with the main house, the lease should say that plainly, so the lender can see which rent belongs to which structure.
A separate lease for the casita is usually cleaner than one combined lease, because each rent can be matched to its own market opinion. A combined lease can work, but it forces the lender to split the number, and splits invite haircuts.
Rent history matters too. If a tenant is already in place on a month-to-month basis, the same evidence logic applies. Lendmire’s piece How to Document Month-to-Month Rent on Your First Rental Cash-Out Refinance walks through that side of it.
Why Does Legal Status Decide Everything?
Because the appraiser and lender trust paperwork, not intent. A long-running appraisal paper on accessory dwellings notes that unpermitted units are often the only kind local lenders and brokers know, and that lending guidance has pushed appraisers to give illegal units little contributory value.
A practicing appraiser writing on the Sacramento Appraisal Blog lists permits and legal rentability among the key value factors. His advice is practical: hand the appraiser the permit documentation along with rental income and expense details. Both sources are older, so treat them as principles rather than current rules.
On a cash-out, this hits twice. If the appraiser excludes unpermitted square footage from value, your leverage drops. If the lender excludes the rent, your coverage drops. You can lose both at once.
Remodel cost is not appraised value either. A casita that cost a lot to build may support a higher appraised value, depending on comps and underwriter review, but never a dollar-for-dollar return.
Where Does the General Rule Break?
The step-by-step flow covers the normal case. These edge cases change it.
Unpermitted or converted casita. Expect the rent and square footage to be excluded. Some jurisdictions treat older units as legal-nonconforming, which can change the outcome, but you need the documentation to prove it.
Family member in the casita. Related-party leases get closer review. A below-market family lease can pull the counted figure down under a lower-of treatment, so a signed lease at market rent and a clean payment record matter more here.
Vacant casita. With no lease, the lender may lean entirely on the appraiser’s market rent, or exclude the rent. Some programs want proof the unit is rentable and ready.
Owner-occupied casita. If you live in the casita yourself, the property may not fit an investment-property program at all. Confirm occupancy rules before you order anything.
Short-term-rental casita. Form 1007 documents monthly rent, and McKissock notes it is not designed for short-term rentals. STR files use a separate income path, such as platform history or a data projection. Programs in our network typically expect a 640+ score and about 12 months of hosting history. On short-term-rental collateral a cash-out tops out around 70% LTV, while a standard long-term rental cash-out tops out at 75%.
No casita comps. If the appraiser cannot find rentals of similar casitas, the agency world offers a hint. Fannie Mae’s published ADU scenario sheet allows an appraiser to use similar non-ADU rentals and adjust for factors that affect market rent. That is a conventional-loan document, not a DSCR rule. It does show how sensitive the rent opinion becomes to the appraiser’s judgment, which is why a short comp packet from you can help.
Ineligible structures. A casita built as a manufactured unit, a log structure or a barndominium-style building is not offered in our network’s DSCR programs, no matter how well the lease is documented.
DSCR vs. conventional financing
There are two common ways to finance an investment property, and they qualify you differently — here’s how investors weigh them.
Why investors choose it
- Qualifies on the property’s rental income — no personal tax returns, W-2s, or pay stubs needed to document income.
- No personal debt-to-income ceiling to clear, so existing mortgages and obligations don’t cap your borrowing the same way.
- Can be closed in an LLC, keeping the property inside a business entity.
- Built for scaling — not held to the limit on number of financed properties that conventional financing applies.
- Underwriting centers on the deal: generally qualifies when the rent covers the payment, a 1.00x coverage ratio being a common baseline (confirmed in underwriting).
- Designed specifically for investment property, including long-term and, where the program allows, short-term rentals.
Where it’s strong
- Often the lowest ongoing financing cost for a buyer who fully qualifies on personal income — a fit for a first property or a cost-first purchase.
Trade-offs for investors
- Requires full personal income documentation and must fit within a debt-to-income limit — salary, existing debts, and other mortgages all count.
- Typically held in your personal name rather than a business entity.
- Caps how many financed properties you can carry, which can become a ceiling as a portfolio grows.
- Evaluates you as a borrower as much as the property, which usually means more paperwork.
How investors usually choose: a first or single property often optimizes for the lowest financing cost; portfolio builders often optimize for leverage, vesting in an LLC, and scaling past conventional caps. The right answer depends on your goals, the property, and current guidelines — both paths run through select lenders in Lendmire’s wholesale network, with eligibility and terms confirmed in underwriting.
What Do the Numbers Look Like? A Modeled Example
Picture a single-family rental with a detached casita and a cash-out refinance on the table. The figures below are modeled assumptions, not market data.
- Main house rent alone covers the new PITIA at about 1.05x.
- The casita’s market rent adds roughly 0.20x if counted in full.
- Counted in full, total coverage is about 1.25x.
- If the appraiser’s rent for the casita comes in at half that level, it adds about 0.10x, and coverage lands near 1.15x.
- If the casita is excluded, coverage falls back to about 1.05x.
Notice that the cash-out raises the payment, so the ratio must clear against the new, larger obligation. That is why a casita that looked like a bonus on the old loan can become the difference on the new one.
The ratio only tells you that rent covers PITIA. It does not tell you the property cash-flows, because repairs, vacancy, management, utilities and capex sit outside the calculation.
Leverage runs on its own track. On a cash-out of a standard investment rental, the ceiling across most of our network is 75% LTV, and about 6 months of seasoning is the common expectation. Credit minimums start at a 620 floor in parts of the network, with most programs wanting around 660 and 700+ unlocking the strongest tiers. Reserves commonly run around 6 months of PITIA, stepping up to about 9 months above $1,500,000. Standard programs go up to $3,000,000. All of this is subject to lender guidelines, and every file is underwritten individually.
A larger equity cushion can lower the payment and lift the ratio. It never erases leverage caps, credit floors or reserve rules. The strongest files clear both tests: enough equity and enough rental coverage. If the title was recently acquired, Lendmire’s guide How to Document Title Seasoning for a Delayed Financing Cash-Out covers the timing side.
What If the Casita Rent Doesn’t Count?
You have four practical options, and they can be combined.
1. Trim the ask. Take a smaller cash-out so the main house’s rent alone clears the ratio.
2. Fix the paperwork. If the unit is legal but undocumented, assemble the permit trail and re-order the appraisal with the documents in hand.
3. Wait and season the rent. A tenant in place with a clean payment record is easier to support than a lease signed just before the refinance.
4. Change the structure. Extended terms (40-year) and interest-only periods are available through select lenders in the network, and select lenders also take coverage below 1.00 with leverage and terms adjusted. Qualification stays subject to lender guidelines, credit approval and property review.
The honest broker view: if the casita is the only reason a deal works, the deal is thin. The appraiser’s opinion and the lender’s counting rule are both outside your control.
What Should You Do Before the Appraisal Is Ordered?
Work the list in this order.
1. Confirm with your loan officer how the property will be classified and which rent form will be used.
2. Pull the permit, final sign-off and any zoning letter.
3. Sign a separate casita lease at market rent, or confirm the existing one matches the unit’s real size and utilities.
4. Collect rent deposits showing the casita’s address.
5. Prepare a short comp packet of nearby small rentals for the appraiser, understanding that the appraiser’s judgment still governs.
6. Read the whole picture in Lendmire’s complete DSCR loans guide so the leverage and coverage tests are clear before you apply.
Frequently Asked Questions
Does a detached casita’s rent count toward DSCR?
It can, when the unit is legal, the appraiser supports a market rent for it, and the lender’s program counts it.
Do I need a separate lease for the casita?
A separate lease is usually cleaner, because each rent can be matched to its own market opinion. A combined lease can work if it plainly states what portion belongs to the casita. Confirm the preference with your loan officer.
What if my casita is unpermitted?
Expect the rent and the square footage to be left out of value and income. If the unit is legal-nonconforming under local rules, bring that documentation. Otherwise, size the cash-out as if the casita does not exist.
Can a relative rent the casita?
Yes, but related-party leases get closer review. A market-rate signed lease with a regular payment record supports the file far better than a handshake arrangement. A below-market lease can reduce the counted rent.
Does Form 1007 capture Airbnb income?
No. It documents monthly rent only. Short-term rental casitas use a separate income path, such as booking history over about 12 months on most programs we place.
Next Step
If you are buying or refinancing a rental property and want to see how the numbers work, Lendmire can help you compare DSCR loan options based on the property income, credit profile, leverage, and investor goals. As a broker, Lendmire arranges financing through select lenders in its wholesale network across 41 markets, including Washington, D.C. Programs and eligibility are subject to lender guidelines. This is not a commitment to lend.
Investors weighing their equity options can start with Lendmire’s guide to cash-out refinance on an investment property.
About Lendmire
Lendmire (NMLS# 2371349), a non-QM mortgage broker serving investors in 41 markets including Washington, D.C., helps structure DSCR scenarios commonly evaluated around a property’s rental income rather than personal income paperwork, subject to lender guidelines. A Scotsman Guide Top Mortgage Workplace in 2025 and 2026, Lendmire places loans through wholesale investor lenders and is not a direct lender.
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References
1. McKissock Learning, Form 1007 and short-term rental appraisals
2. Accessory Dwellings, appraising properties with ADUs
3. Sacramento Appraisal Blog, how to figure out what an accessory dwelling is worth
4. Fannie Mae, ADU income scenario sheet
This article is part of Lendmire’s investment property cash-out refinance program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Can a Condo Be Refinanced on DSCR Before Any Rent Is Collected? · How to Document Airbnb Income From a Garage Conversion on a DSCR Loan · How to Weigh Giving Up a Low First Mortgage for DSCR Cash-Out
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Important disclosures. Lendmire (NMLS# 2371349) is a licensed mortgage brokerage. Lendmire is not a direct lender, depository institution, or financial advisor. All loan inquiries are subject to lender underwriting; this article does not constitute a commitment to lend. Rates, terms, and program guidelines are subject to change without notice and vary by borrower profile, property type, and state. Information in this article is general in nature and is not financial, legal, or tax advice. Equal Housing Opportunity. NMLS Consumer Access: nmlsconsumeraccess.org.