Bank Statement HELOC vs Bank Statement Cash-Out Refinance for an Accessory Dwelling Unit

The Quick Read: A bank statement HELOC adds a second-lien credit line and leaves your current first mortgage alone, while a bank statement cash-out refinance replaces that first mortgage with a larger loan and pays you the difference in one lump sum. Both qualify you on deposits in your bank accounts rather than tax-return income, so the real choice comes down to your existing mortgage, how you hold title, and how the build gets paid.

• “Bank statement” describes only how your income is documented. It does not change how the loan is structured.
• A HELOC suits owners with a first mortgage worth keeping and a build budget that comes in stages.
• A cash-out suits owners whose first mortgage is no longer worth protecting, or who need one large sum.
• Title matters: the HELOC route requires the property to sit in your name or a revocable trust, not an LLC.
• After the unit is leased, a DSCR cash-out refinance can sometimes replace either one.

If you are self-employed, you like your current first mortgage, and you own the home personally, the HELOC is usually the cleaner tool. If your first mortgage is a poor fit, or you want one fixed-structure loan with one payment, the cash-out deserves a hard look. Neither is “better.” They solve different problems, and the ADU (accessory dwelling unit, a small separate home on the same lot) adds a few wrinkles that this page walks through.

Side-by-Side

The HELOC column below reflects the parameters across the wholesale HELOC lenders Lendmire works with. The cash-out column shows published industry norms, which vary by lender and program. Every figure is subject to lender guidelines and a full file review.

One thing the table cannot show is how “bank statement” fits in. It sits on top of either structure. It is a documentation method, not a third product.

What Does “Bank Statement” Actually Change?

It changes how a lender measures your income, and nothing else. Instead of reading your tax returns, the lender totals eligible deposits across 12 or 24 months of statements and works out a monthly figure. Scotsman Guide describes the standard version: a self-employed borrower supplies personal or business statements, and the lender may apply an expense factor to business deposits. Scotsman gives 50% as an example only. The actual factor is the lender’s call.

A few practical points follow from that.

• Personal versus business accounts. Personal deposits are generally treated closer to net. Business deposits are reduced by the expense factor.
• Excluded deposits. Transfers between your own accounts, loan proceeds, and refunds are removed. Large one-time deposits often need a written explanation.
• Ability to repay still applies. Scotsman notes that non-QM lenders must still confirm you can repay. The lender sets its own rules for how it gets there.

This is also where bank statement loans differ from DSCR loans. A DSCR loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. A bank statement loan looks at you. For an ADU on a home you live in, that distinction matters, because the new unit is not yet producing rent.

Self-employed owners often show low taxable income after write-offs. Deposit-based underwriting can raise the coverage figure for those borrowers, which is the main reason this documentation path exists.

How Does a Bank Statement HELOC Work for an ADU?

A HELOC is an open-end line of credit. The CFPB explains that you can borrow repeatedly up to your limit during a draw period, then enter a repayment period in which you can no longer borrow. Payments are often significantly higher in repayment, and in some cases the whole balance can come due when repayment begins. The FTC adds that your home secures the line, so missed payments put the home at risk.

Now the part that surprises ADU builders. On the HELOC programs across Lendmire’s network, at least 75% of the line is drawn at closing. That cuts against the usual picture of a line you tap as invoices arrive. Pricing on these lines floats through both the draw and repayment periods and never converts to fixed. If your build is staged over many months, you may carry interest on money you have not spent. Ask any lender how much must be drawn at closing before you pick this route.

Here are the network parameters that matter most for an ADU project.

• Line size. Lines run from $25,000 to $750,000. Anything above $500,000 is for primary residences only and needs a full appraisal.
• Leverage by occupancy. On an investment property, the ceiling is 70% CLTV (combined loan-to-value, meaning all liens added together against the home’s value), with a $500,000 maximum line and a 700 minimum credit score. On a primary residence, the ceiling reaches 90% CLTV, but only at a 720-or-better credit profile and up to $500,000. On a second home, 90% also requires 720 or better.
• Draw structure. Primary residences and second homes can choose a 3-year interest-only draw with a 17-year repayment, or a 5-year draw with a 25-year repayment. Investment lines use the 5-year draw and 25-year repayment only.
• DTI. Maximum DTI is 50%, tightening to 45% for credit profiles from 600 to 679. The lender reviews your file on the interest-only payment calculated on the maximum draw.
• Lien position. The line can sit in first or second position. If you want to keep your existing first mortgage, you must choose second position on purpose.
• Valuation. Lines at or below $500,000 ordinarily use automated valuation, though you can request a full appraisal. Above $500,000, a full appraisal is required.
• Availability. The HELOC programs are available only in the 16 states where Lendmire offers full-service lending: AL, CA, CO, FL, GA, IN, MI, MT, NM, NC, OH, PA, TN, TX, VA, and WA.

Ineligible property types include manufactured homes, co-ops, condotels, log homes, and commercial, mixed-use, or agricultural-zoned properties. A prefab or manufactured ADU unit may therefore raise eligibility questions on the property itself.

How Does a Bank Statement Cash-Out Refinance Work for an ADU?

A cash-out refinance pays off your current first mortgage and replaces it with a new, larger loan. The difference arrives as one lump sum. You get one new payment instead of an existing mortgage plus a line.

The trade is simple. You give up your current first mortgage terms, good or bad, in exchange for a single clean structure and a fixed amount of cash up front. That is useful when your ADU budget is known, a contractor wants a large deposit, or the existing first mortgage is a poor fit.

Published industry norms for bank statement cash-outs share a few traits, though each lender sets its own numbers.

• Statements typically cover 12 or 24 months.
• Leverage depends on credit score, occupancy, and loan size.
• Reserves vary by lender, leverage, and loan size.
• Title and vesting rules differ by program, so confirm them before you apply.

Ask for the specific program’s leverage cap and reserve rule in writing. A general market figure tells you very little about your file.

When a Bank Statement HELOC Is the Better Fit

A HELOC tends to win in these situations.

• You have a first mortgage worth keeping. If your existing first mortgage has terms you would not replace, a second lien leaves it untouched.
• You do not need all the money at once. The line gives you flexibility to draw more later, with a $1,000 minimum subsequent draw on most files. Remember the 75% drawn at closing, though.
• You want a lower closing footprint. A second-lien product does not rework your whole first mortgage.
• You hold title personally or in a revocable trust. This is a hard requirement. LLCs, corporations, partnerships, and irrevocable, blind, or land trusts cannot hold title on these lines.
• Your equity is moderate. On an investment property the ceiling is 70% CLTV, so the line works best when your existing balance leaves real room beneath that cap.

The Terner Center’s ADU research found that most ADU owners in its California survey financed with cash, a HELOC, or a cash-out refinance. That is California data, not a national benchmark, but it shows both tools are common routes.

Watch the risks. The draw period eventually ends, and payments can rise sharply in repayment. If the ADU needs time to lease up, plan for that step-up before you borrow.

When a Bank Statement Cash-Out Refinance Is the Better Fit

A cash-out refinance tends to win in these situations.

• Your current first mortgage is a poor fit. If you are already considering a reset, folding the ADU money into one new loan can make sense.
• You need one large sum. A fixed construction contract with a big upfront draw matches a lump sum better than a line.
• You want one loan and one payment. Two liens are two things to track.
• Title is already in an LLC. A bank statement HELOC cannot close in an LLC. A property already deeded to an LLC needs a vesting change first, or a DSCR cash-out instead.
• You are above the line limits. A budget above $500,000 on an investment property does not fit a HELOC at all.

The cost is real. You are replacing a mortgage you may like, and the new loan covers your entire balance. That changes the math on everything.

Does the ADU’s Value or Future Rent Help You Qualify?

Usually not directly. On a bank statement loan, income comes from your deposits, not from the unit. Lenders also generally lend against the home’s current value. A completed ADU may support a higher appraised value, depending on comps and underwriter review, but a unit that does not exist yet adds nothing today.

That timing matters. The Terner Center and USC Lusk research summarized by SV@Home recommends changing how ADU rental income is considered in underwriting and how ADUs are appraised, which tells you those questions are still unsettled. Treat the ADU as a project you fund from today’s equity, not from tomorrow’s rent.

What Happens After the ADU Is Leased?

Many owners treat either loan as a bridge. Once the unit is rented and stable, a DSCR cash-out refinance on the rental property can sometimes replace the earlier financing. DSCR (debt service coverage ratio) compares the property’s rent to its full monthly obligation. Across most of the network, a DSCR cash-out on a standard rental tops out around 75% LTV, with about 6 months of seasoning as the common expectation. Whether and how ADU rent counts is program-specific, so ask before you assume. Every figure here varies by lender and program — guidelines, property type, leverage, and credit profile all apply.

Clearing 1.00 on coverage is not the same as positive cash flow. Repairs, vacancy, management, and utilities sit outside the calculation. For the full picture, see the complete DSCR loans guide.

If you want a broader side-by-side of equity lines against cash-out on rentals, Lendmire also covers the bank statement HELOC in more detail.

When Neither One Works

Sometimes neither fits. A few common blockers:

• Your credit profile falls below the program floors. The HELOC floor is 600 overall, 640 on second homes, and 700 on investment properties.
• Your property type is not eligible.
• You own more than 15 financed properties, or you already hold three lines.
• Your DTI runs above the program limit.
• Your equity is too thin for the CLTV cap.

In those cases, a different structure, a smaller project, or building equity first may serve you better. A broker that shops several wholesale lenders can tell you which of those paths applies before you spend money on an appraisal.

Key Terms Defined

Bank statement loan: A mortgage that is reviewed around deposits in your bank accounts instead of tax returns.

HELOC: A home equity line of credit, a revolving line secured by your home.

Cash-out refinance: A new first mortgage that pays off the old one and gives you the extra amount in cash.

CLTV: Combined loan-to-value, which adds every loan on the property and divides by its value.

ADU: An accessory dwelling unit, a small separate living space on the same lot as a main home.

DSCR: A ratio that compares a property’s rent to its monthly debt payment.

The Verdict

Choose the HELOC if you hold title personally, your first mortgage is worth keeping, and you can live with most of the line being drawn up front. Choose the cash-out if your first mortgage needs replacing, you want one loan, or your title or budget does not fit the line. If neither fits, the decision comes down to your equity, credit, and how the ADU will eventually earn its keep.

If you are weighing a home equity line against a cash-out refinance and want to see how the numbers work, Lendmire can help you compare HELOC options based on the property, the equity available, credit profile, combined leverage, and your goals. Every program is subject to lender guidelines and a full file review. This is not a commitment to lend.

For how equity extraction works on an investment property, see Lendmire’s guide to cash-out refinance on an investment property.

About Lendmire

As a mortgage broker (NMLS# 2371349), Lendmire helps homeowners and real estate investors in its 16 full-service states open home equity lines of credit arranged through wholesale lenders. Lendmire is never the lender; line amounts, ceilings and terms are set by the lender under its guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. Scotsman Guide – Rev Up the Engine for Non-QM Lending

2. CFPB

3. FTC – Home Equity Loans and Home Equity Lines of Credit

4. Terner Center – ADU Brief

5. SV@Home – Terner Center and USC Lusk ADU Financing