The Quick Read: A permitted casita can usually be valued and its rent counted, while an unpermitted one is often treated as a collateral problem whose income and value get excluded. The appraiser’s legal-status finding drives most of the outcome, and each lender in the network applies its own overlays on top of it.
- Permitted casita: permit and occupancy paperwork lets the appraiser treat it as a real, rentable unit.
- Unpermitted casita: value credit can fall anywhere from zero to cost-based, and rent is often excluded.
- Cash-out on standard rentals tops out around 75% LTV, so a lower value pulls proceeds down directly.
- The safest stress test is the main house alone, with the casita’s rent and value treated as upside.
- Coverage is rent against PITIA only, and clearing 1.00 does not mean positive cash flow.
The honest answer on who each option suits: the permitted route fits an investor who wants the casita to carry weight in the loan. The unpermitted route fits an investor who can qualify on the main house alone and treats the casita as a bonus. Everything below is about which side of that line a given file falls on.
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Side-by-Side
The table compares how files with each status tend to be reviewed. The permitted column reflects Lendmire’s network guidelines. The unpermitted column reflects published industry norms and practitioner patterns, which vary by lender and appraiser.
| Factor | Permitted casita | Unpermitted casita |
|---|---|---|
| Review basis | Rent vs PITIA, casita rent may count | Often main-house rent only |
| Appraiser treatment | Valued and reported as legal | Flagged, may be excluded from value |
| Documentation | Permit, final sign-off, zoning proof | Permit history search, remediation plan |
| Property type read | May be 1-unit or 2-unit by lender | Often treated as a collateral risk |
| Entity vesting | Same parcel and title confirmed | Parcel and easement questions add scrutiny |
| Reserves | Commonly around 6 months PITIA | Same base rules, added conditions possible |
| Cash-out ceiling | Up to 75% LTV, standard rental | Same ceiling on a lower reported value |
Entity vesting follows the same logic on both sides: an LLC can hold title subject to lender program eligibility, and the casita must sit on the same legal parcel as the main house for either column to work cleanly.
Who Decides What
Three parties touch the casita, and they get blurred together. The appraiser decides what the structure is: a legal ADU, an unpermitted structure, or not a dwelling. The lender decides whether its program accepts that classification and how much of the value and rent to use. The city decides whether the structure is legal, which is a separate question from either of the first two.
That distinction matters because “the appraiser won’t count it” and “the lender won’t lend” are different outcomes with different fixes. A low appraisal can be addressed with comps and documentation. A program that excludes the structure is a reason to look at another lender in the network.
For contrast only, agency rules show where the legal-status question sits in a standard appraisal. Fannie Mae’s Selling Guide places the ADU determination inside the highest and best use analysis. Those agency rules do not govern DSCR files. Investor lenders set their own overlays.
How the Forms Work on a Rental
The appraisal paperwork shapes how the casita is read. A one-unit property usually gets the standard appraisal plus a rent schedule. The Fannie Mae forms list shows the Form 1007 single-family comparable rent schedule and the Form 1025 small residential income report for 2-4 units. Whether a lender treats a detached casita as a second rentable unit or as an accessory to a one-unit home is the lender’s call, and it changes which form shows up on the file.
That is a real fork. A 1007 estimates market rent on the main house. A 1025 builds an income picture across units. A permitted casita that a lender reads as a second unit can push the file toward the 1025 treatment, and some programs have different rules for two-unit collateral. Unpermitted casitas rarely get that treatment at all.
When a Permitted Casita Is the Better Fit
The permitted path is better when the investor wants the casita to count. A casita with permits, final sign-off, and zoning that allows the use gives the appraiser something to value and a rent opinion to support.
What the file usually carries:
- Permit and certificate-of-occupancy evidence.
- Zoning confirmation for the use.
- A lease, or the appraiser’s market-rent opinion.
- Proof the casita sits on the same legal parcel, with any shared driveway or utility easements documented.
Consider an investor with a main house and a finished, permitted casita, both leased. Say the main house alone covers the debt at roughly 0.95x, and adding the casita’s supported rent lifts the file to around 1.2x. In that file the casita is doing real work. Coverage near 1.2x on a standard rental sits comfortably against the 1.00 level where select programs start, and stronger ratios open better leverage and terms.
The cash-out math stays inside the network’s ceiling. Cash-out on a standard rental tops out around 75% LTV, with about 6 months of seasoning measured from title recording. Reserves commonly run around 6 months of PITIA, stepping up to about 9 months above $1,500,000. Credit floors start at 620 in parts of the network, with most programs wanting around 660 and 700+ reaching the strongest tiers. All of that is subject to lender guidelines, and equity available depends on rent used for lender review, PITIA, reserves, and the 75% ceiling. It is not a guaranteed cash figure.
One caution even here: a permitted casita still needs comps. If similar casitas are common nearby, the appraiser can usually find them. If they are rare, value credit can come in light even with clean paperwork.
When an Unpermitted Casita Is the Better Fit
The unpermitted path is the better fit only when the loan does not depend on the casita. That sounds like a consolation prize, but it is a legitimate structure. If the main house is reviewed on its own rent and the equity supports the cash-out at the 75% ceiling, the casita can sit outside the loan math entirely.
What happens when it does not sit outside:
- The appraiser may flag the structure and leave it out of gross living area and value.
- Rent from the casita may be excluded or capped, even when a tenant is paying it.
- Conditions can appear, such as remediation, permit sign-off, or removal.
- Insurance becomes a question, since insurers can exclude structures that were never declared. An independent appraisal firm’s Bay Area guide notes that some lenders refuse houses with illegal additions, others limit financing to the documented square footage, and approved loans often see the improvement valued lower. It is regional, so take the general points only.
Run it this way. The main house covers at about 1.1x on its own rent, and the investor has been collecting casita rent informally. Underwrite the file with casita income at zero and the cash-out sized off the main-house value. If the appraiser gives the casita partial credit, that is upside. If the appraiser gives none, the file still stands. That is the only version of the unpermitted route that holds up.
The version that fails is the one built on casita rent and casita value. If both come back lower than assumed, proceeds shrink and coverage can drop below 1.00. Coverage below 1.00 is available through select lenders in the network, with leverage and terms adjusted, but that is a different path from a 1.00 file, not the same program with a lower floor.
Disclosure is the other hard edge. Leaving known unpermitted work off an application is a risk that reaches past the loan, so the file should describe the structure as it is.
Where Files Land in the Middle
Real casitas are not always cleanly one or the other. A few gray cases come up often.
Grandfathered or legal nonconforming. The unit predates current zoning. Agency guides treat this differently from unpermitted. Investor lenders may or may not follow the distinction, so a municipality letter confirming status is worth having.
Permit opened but never finaled. This usually reads closer to unpermitted than permitted. The fix is finishing the inspection sequence before the appraisal is ordered.
Permitted shell, unpermitted kitchen or bath. The legal structure exists, but part of what makes it rentable does not. Expect the appraiser to report that split.
Retroactive permitting. Possible in some jurisdictions, with fines, fees, and possible rework. The risk is a tear-out and re-inspection, so get the cost picture before committing the cash-out timing to it.
Number of structures. Some lenders limit financing to one accessory unit. A lot with two should be raised early.
Sequencing the Fix
An investor holding an unpermitted casita has three realistic paths. Refinance as-is with the casita excluded. Legalize first, then refinance. Or skip the cash-out until the permit work is done.
Legalize-first makes sense when the casita’s rent is what makes the file work. The permit work should be finished and documented before the appraisal, not after. Refinancing as-is makes sense when the main house carries the file and the legalization cost or risk is high. The third path is rarely wrong when the numbers only work with casita income.
A practitioner note on how these files tend to go: the appraiser’s status finding usually arrives before the investor expects it, and by then the loan size has already been pencilled around casita value. Files that start from the main-house-only number, then add the casita as a documented upside, hold their structure when the appraisal lands. Files that start from the full number tend to need a rebuild. Keep reserves documentation and entity documents ready either way, since those are the gaps that stall a file once the property question is settled.
The ineligible property types are worth restating, because casitas sometimes get built or converted from them. Manufactured homes, log homes, and barndominiums are not offered in the network’s DSCR programs, so a casita of that construction type is not a candidate regardless of permits.
Key Terms Defined
Casita: A small detached or semi-detached living structure on the same lot as a main house, often with its own entrance.
ADU (accessory dwelling unit): A legally recognized second dwelling on a lot, with its own living, sleeping, and kitchen facilities.
Legal nonconforming: A structure that was lawful when built but no longer matches current zoning rules.
Gross living area: The finished, permitted square footage an appraiser counts toward value.
PITIA: Principal, interest, taxes, insurance, and any association dues, the denominator in the coverage ratio.
Seasoning: The ownership period a lender expects before allowing cash-out, measured from title recording.
Balanced Verdict
Permitted is the stronger file whenever the casita matters to the numbers. It gets valued, its rent can count, and the paperwork answers the lender’s questions before they are asked. Unpermitted is workable only as a main-house-first loan where the casita is a bonus. The mistake is treating informal rent as qualifying income.
Neither option erases the basics. A cash-out still tops out around 75% LTV on a standard rental, still wants roughly 6 months of seasoning, and still needs reserves and credit that fit the program. DSCR compares rent to PITIA only, so clearing 1.00 does not mean the property cash flows once repairs, vacancy, and management are counted. Investors comparing structures can start with Lendmire’s complete DSCR loans guide, and those still weighing how to fund the next purchase can read Lendmire’s piece HELOC vs Cash-Out Refinance for a Rental Down Payment: What Decides. Terms depend on the lender’s guidelines, the property type, the leverage, and a full review of the credit profile.
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. Tax treatment varies; consult a qualified professional.
Frequently Asked Questions
Can I cash-out refinance a rental with an unpermitted casita?
Often yes on the main house, but the casita’s value and rent are commonly excluded. The loan has to work on the permitted structure alone. Outcomes depend on the appraiser and each lender’s overlays, subject to lender guidelines.
Will the appraiser count an unpermitted casita?
Sometimes partially, often not at all. Credit can range from zero to a cost-based figure, depending on local comps and how the market values such structures. Plan for the low end.
Does casita rent count toward coverage?
On a permitted casita, supported rent can count, either through a lease or the appraiser’s market-rent opinion. On an unpermitted one, rent is frequently left out even when a tenant is paying it.
Can I legalize the casita before refinancing?
In some places, yes, though fees, fines, and rework vary. Finishing permits and final inspections before the appraisal is ordered keeps the file cleaner than doing it afterward.
Does a casita change the property type on the file?
A lender may read a permitted detached casita as a second unit, which can shift the appraisal form and collateral rules. How that works depends on the lender.
For how equity extraction works on an investment property, see Lendmire’s guide to cash-out refinance on an investment property.
About Lendmire
Lendmire — NMLS# 2371349 — is a DSCR and non-QM mortgage brokerage with investor loan programs in 41 markets, including Washington, D.C. DSCR eligibility is commonly reviewed by the lender around property-level rent rather than personal income documentation, subject to lender guidelines, and the brokerage helps arrange financing for LLC-owned portfolios beyond conventional financed-property limits. Recognized by Scotsman Guide as a Top Mortgage Workplace in 2025 and 2026.
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References
1. Fannie Mae Selling Guide B4-1.3-05
2. Fannie Mae Selling & Servicing Guide Forms
3. Schumacher Appraisal: Valuing Unpermitted Additions
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: How to Compare Selling a Rental With a DSCR Cash-Out Refinance · Should You Sell a Short-Term Rental or Refinance When Bookings Drop? · How to Make a DSCR Cash-Out Cover Your Hard Money Note and Rehab Cards
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Disclosures. The information presented in this article is general market commentary, not financial, legal, or tax advice. Lendmire is a mortgage brokerage (NMLS# 2371349) — not a direct lender or depository institution — and loan placement is subject to lender underwriting. Nothing in this content represents a commitment to lend. Loan terms, pricing, and program availability vary based on borrower qualifications, property characteristics, and state of subject property, and are subject to change at any time. Lendmire complies with Equal Housing Opportunity requirements. Consumer access: nmlsconsumeraccess.org.