The Quick Read: Start with your equity, not your build budget. A bank statement cash-out refinance replaces your current mortgage with a larger one and is reviewed around 12 months of deposits instead of tax returns. The appraiser values the home as it stands today, without the unit. So the cash you can pull depends on today’s value, your loan-to-value (LTV) cap, and what you still owe.
- Qualifying income comes from your deposits, not from the ADU’s future rent.
- On an owner-occupied primary residence, cash-out typically tops out at 80% LTV, or 75% with an accountant-prepared expense ratio.
- On a second home, cash-out typically runs up to 75% LTV. On an investment property, it tops out around 75% LTV.
- The ADU’s build cost may not show up in the appraised value, so plan for a gap.
- Sequence matters: refinance first and build second, or build another way and refinance after the unit is leased.
An accessory dwelling unit (ADU) is a small second home on the same lot as your main house. Think backyard cottage, garage conversion, or basement apartment. Self-employed owners often want one. They also often have tax returns that make their income look smaller than it is.
This guide walks through the whole process in order. It covers what the loan is, how the income math works, how to size the loan to the build, and where the plan can break.
What Is a Bank Statement Cash-Out Refinance?
A cash-out refinance replaces your current mortgage with a new loan for more than you owe. You keep the difference in cash.
The bank statement version changes only how income is documented. The cash-out mechanics stay the same. Instead of W-2s and tax returns, the lender reads your deposits over 12 months of business or personal statements. Qualifying income comes from deposit averages with lender-specific expense factors. No lender can promise a universal formula, and every file is underwritten individually.
This loan falls into the non-QM category. Non-QM means the loan does not follow the rules of agency-eligible mortgages. Scotsman Guide’s non-QM primer describes statement programs as a workaround to the strict underwriting agency loans require. It also says income verification, asset confirmation, and repayment-capacity review remain required steps. This is not a stated-income loan. It is reviewed on documented income under the applicable program, subject to lender guidelines.
Does This Strategy Fit Your Situation?
It fits when three things line up. You are self-employed or have uneven income. You have real equity in the home. And you want to build before the unit can earn anything.
It fits poorly when your equity is thin. A cash-out loan is capped by loan-to-value, so thin equity leaves little to pull out. That is why the equity math comes first.
Here is how the main funding paths compare in plain terms.
| Path | Best fit | Main tradeoff |
|---|---|---|
| Bank statement cash-out | Self-employed owner with equity | Resets the whole first loan |
| Home equity line (HELOC) | Owner keeping a good first loan | Separate second lien, variable structure |
| Construction-to-perm loan | Large builds funded in stages | Refinance step at the end |
| DSCR refinance after lease-up | Rent-producing unit already built | Needs a leased, appraised unit |
A HELOC is a revolving credit line secured by your home. A DSCR loan is reviewed for the property on whether its rent covers the payment.
Key Terms Defined
Cash-out refinance: A new, larger mortgage that pays off the old one and hands you the difference in cash.
Bank statement loan: A mortgage that is reviewed around average deposits over a set window, usually 12 months, instead of tax returns.
Expense factor: The share of business deposits a lender treats as operating costs before counting the rest as income.
LTV (loan-to-value): The loan amount divided by the property’s appraised value.
Seasoning: The waiting period a lender wants before it will allow a cash-out refinance after a purchase or earlier refinance.
Reserves: Liquid savings a lender wants you to hold after closing. On alt-doc files, commonly around 6 months of the housing payment.
DSCR (debt service coverage ratio): Monthly rent divided by the monthly debt payment, used to qualify rental properties.
How Bank Statement Income Gets Read
Here is the process, in order.
1. Pick the statement window. Most programs want 12 months of business or personal statements. Scotsman Guide gives 12 to 24 months as the common range across non-QM lending.
2. Scrub the deposits. Transfers between your accounts, loan proceeds, refunds, and other non-revenue credits come out before averaging.
3. Average the rest. Eligible deposits are divided by the number of months in the window.
4. Apply the expense factor on business accounts. A flat factor is common. Scotsman Guide gives 50% as an example, but it is not a rule. Programs differ, and an accountant-prepared expense statement or profit-and-loss statement can substitute on some. Scotsman also notes a flat factor can wrongly shortchange asset-heavy businesses, which is where an accountant’s letter helps.
5. Feed the result into the debt-to-income review. The resulting monthly income is used much like traditional employment income would be.
Across a wholesale network, the expense treatment is where programs differ most. Some use a fixed ratio. Others accept a ratio prepared by your accountant. On an owner-occupied primary residence cash-out, the fixed-ratio route reaches up to 80% LTV. The accountant-prepared route is the lower ceiling at 75%. Many borrowers assume professional paperwork buys more leverage. Here it does the opposite. Terms depend on the lender’s guidelines, the property type, the leverage, and a full review of the credit profile.
The ADU Twist: When the Money Moves
The sequence of your plan changes everything about how the loan works. There are two models.
Model 1: Refinance First, Build Second
You pull the cash, then fund construction from it. The appraisal reflects your home as it exists today, without the unit. Equity must exist before the ADU does. The ADU is not yet producing rent, so your deposit-based income carries the qualification.
Model 2: Fund the Build Another Way, Refinance After Lease-Up
You pay for construction with other money, then refinance once the unit is built, leased, and appraised. Many investors then move to a DSCR loan sized to the property’s total rent. This route needs more cash up front. It also rewards you with an appraisal that can see the finished unit.
Which one is right depends on how much equity you have today and how much cash you can safely tie up. That point is worth weighing. Cash sunk into drywall cannot sit in a reserve account.
Does ADU Rent Help You Qualify?
Not on this path. The qualifying income is your deposits, not the unit’s projected rent. That is a feature, not a bug, because the unit does not exist.
Agency programs treat ADU rent differently, and the contrast explains why non-QM matters here. Fannie Mae’s selling guide allows ADU rent as qualifying income only for one existing ADU, on purchase or limited cash-out transactions, and caps it at 30% of total qualifying income. Agency programs are a separate lane, and their rules do not govern Lendmire’s network programs. A deposit-based file sidesteps the question.
Once the unit is built and leased, rent can matter again. A DSCR refinance qualifies primarily on property-level rental income covering the payment, subject to lender guidelines. Lendmire’s complete DSCR loans guide explains that lane.
Plan the Budget First, Then Size the Loan
Build the budget before you talk to anyone. List these buckets:
- Hard costs: the construction itself.
- Soft costs: design, engineering, and permit fees.
- Contingency: a cushion for overruns.
- Closing costs on the new loan.
Cost estimates for ADUs vary widely by place and design. A Virginia Housing Commission brief summarizing research puts the average near $180,000, and much higher in some places. Treat that as a secondary-source average, not a quote for your lot.
Closing costs deserve their own line. A cash-out re-papers your entire first lien, not just the extra cash. So the cost applies to the full balance.
Then run the equity test. Cash available is your home’s value times the maximum LTV, minus your current balance, minus closing costs. Run it twice: once at the 80% primary-residence ceiling and once at 75% for the accountant-prepared route. A second home runs up to 75% LTV. An investment property tops out around 75% LTV. Walk through each scenario with the actual number from your appraisal range. The exact numbers vary by lender and program and follow a full review of property, leverage, and credit.
If the cash does not cover the full budget, you have three options. Shrink the project. Add your own cash. Or switch to the build-first model.
The Appraisal Gap
This is the biggest practical trap. The appraiser values the whole property, not the ADU alone. There is generally no separate ADU appraisal. What differs is the paperwork. Expect permit records and, for a unit that already exists, a rent schedule and sometimes ADU-specific comparable sales.
For rent schedules, appraisers use named forms. Fannie Mae’s selling guide lists Form 1007 for one-unit comparable rent and Form 1025 for small 2-4 unit income properties. Whether a home with an ADU is treated as one unit or two depends on the program, so it is a guideline question for your broker.
Appraised value may not match your build cost. A finished unit may support a higher appraised value, depending on comps and underwriter review. Appraisers and lenders are still working out how to value ADUs. Treat that as a caution, not a measurement. Do not count on getting back every dollar.
Where the General Rule Breaks
Several edge cases can derail an otherwise clean plan.
Unpermitted or non-conforming units. Zoning and permit status matter. How a given program treats an unpermitted unit is a guideline question your broker needs to ask before you apply.
Muddy statements. ADU money flowing through your business account can distort the file. HELOC draws, hard-money draws, or construction-loan proceeds landing in the account are loan proceeds, not income. Large unexplained deposits get flagged. Scotsman Guide notes underwriters must catch them, along with signs of statement tampering.
Contractor payments from the same account. Heavy outflows to a builder can look like spending patterns the lender will question. Keep the build funded from a separate account where you can.
Occupancy. An owner-occupied file is a consumer mortgage, and consumer disclosure rules apply. A cash-out on a non-owner-occupied rental, including a short-term rental, is business-purpose and exempt from those consumer disclosure rules. The lender decides which category your file falls in. Say plainly which one your property fits before you apply.
Short-term rental plans. Short-term rental rules can vary by city, county, HOA, and property type, so investors should confirm local rules before relying on projected rental income.
Timeline: From Idea to Rent Roll
| Phase | What happens | What you need |
|---|---|---|
| Feasibility | Check zoning and permit path | Local planning office answers |
| Budget | Hard, soft, contingency, closing | A contractor bid |
| Pre-qualification | Broker reviews statements and equity | 12 months of statements |
| Appraisal | Value of home as it stands | Access, plans, permits |
| Closing and funding | New loan pays off old | Reserves documented |
| Draws and construction | You pay builder in stages | Tracked, separate account |
| Lease-up | Unit rents | Lease, rent schedule |
| Optional refinance | DSCR loan on total rent | Appraisal with unit |
Rules differ from one place to the next, so check your own jurisdiction first.
Prepare Your Statement Window Before You Build
The 12 months before your application are what the lender reads. Prepare them.
- Keep personal and business money in their own accounts.
- Do not run construction draws through the account that carries your income.
- Document any large deposit with a short written explanation and paper backup.
- Pull 12 months of statements for every account you plan to use, all pages.
- Ask your accountant whether an expense statement would help, given the lower leverage ceiling that route carries.
- Hold reserves, commonly around 6 months of the housing payment, in a place that stays untouched.
After the ADU Is Built
The loan balance is larger and the payment follows. Rent from the unit offsets part of it, but the unit’s rent did not help you qualify. Budget for added insurance and property-tax changes, which vary by county.
Then look at the exit. Loan sizes in the alt-doc lane run roughly $125,000 to $3,500,000. Term length follows each lender’s program sheet, so do not assume extended or interest-only structures on a bank statement loan.
Common Mistakes
- Treating build cost as equal to pullable equity.
- Counting on ADU rent to qualify.
- Letting construction money flow through the income account.
- Skipping the contingency line.
- Spending your own cash first, then falling short on reserves.
- Assuming the 50% expense factor is fixed.
- Applying before checking permit and zoning status.
Frequently Asked Questions
Can a bank statement cash-out refinance fund an ADU?
Yes, if you have enough equity. The cash comes from the refinance, and you use it however you plan. The lender sizes the loan on today’s appraised value, not the finished project, and your income is reviewed against deposits under the applicable program, subject to lender guidelines.
How much can I pull out?
It depends on your home’s value, your balance, and the occupancy. On a primary residence, cash-out typically reaches up to 80% LTV with a fixed expense ratio, or 75% with an accountant-prepared ratio. On a second home, it runs up to 75% LTV. Closing costs come out of the draw.
Will the ADU’s rent count toward qualifying?
Generally not on this path. Qualifying income comes from your bank deposits, and an unbuilt unit has no rent history.
Should I use personal or business statements?
It depends on where your income lands. Business statements usually take an expense factor, so personal statements can look larger on paper, but the lender checks that deposits are truly income. A broker can run both and show which program fits.
Is a HELOC a better way to pay for an ADU?
Sometimes. A HELOC keeps your existing first loan intact. A cash-out re-papers the whole mortgage. Which wins depends on your current loan terms, your equity, and whether you want a lump sum or a draw structure.
What To Do Next
If you are self-employed and want to see how the numbers work, Lendmire can help you compare bank statement loan options based on your deposits, the property, credit profile, leverage, and your goals. Lendmire is a mortgage broker that works with select wholesale lenders, and every file is reviewed individually. Consumer mortgage licensing for this lane covers 16 states, so availability depends on where the home sits. This is not a commitment to lend. Reach out at 828-256-2183 or request a quote at Lendmire.
Build costs rarely land where the first bid says, and the ADU owners who come out ahead are usually the ones who sized the loan to the equity first and the dream second.
Investors weighing their equity options can start with Lendmire’s guide to cash-out refinance on an investment property.
About Lendmire
As a mortgage broker (NMLS# 2371349), Lendmire helps self-employed and high-net-worth borrowers in 16 states qualify on bank statements, a profit-and-loss statement, 1099s or liquid assets instead of tax returns, through wholesale lenders. Lendmire is never the lender; program terms are set by the lender and its guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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Informational only. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
References
1. Scotsman Guide, “Rev Up the Engine for Non-QM Lending”
2. Fannie Mae Selling Guide B3-3.8-02
3. Virginia Housing Commission brief
This article is part of Lendmire’s bank statement loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Top Bank Statement Cash-Out Refinance Providers to Renovate a Condo
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
- North Carolina Real Estate Broker · License# 343312 · Verify on NCREC
- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Required disclosures. Lendmire (NMLS# 2371349) operates as a licensed mortgage broker, not a direct lender or depository. The discussion in this article is general in nature and should not be relied upon as financial, legal, or tax advice — every investment scenario is unique and should be reviewed by a qualified professional. Any loan inquiry is subject to lender underwriting, and this article is not a commitment to lend or a guarantee of approval. Mortgage rates, loan terms, and program guidelines vary by borrower, property, and state, and may change without notice. Equal Housing Opportunity. Verify licensure at NMLS Consumer Access.