How a Bank Statement HELOC Works for an Accessory Dwelling Unit

The Quick Read: A bank statement HELOC is a revolving equity line that usually sits behind the first mortgage, where the borrower’s deposits rather than tax returns prove income, and the line is sized on the equity in the existing home today, so the accessory dwelling unit is the use of the money rather than the thing that drives lender review or sets its size. Two separate tests apply. One asks whether the borrower can carry the payment, and the other asks how much combined leverage the property allows.

• Deposits prove income for the borrower personally. Projected ADU rent generally does not size the line.
• The line is sized on current value, not on what the finished unit might appraise for.
• Occupancy sets the ceiling: investment-property lines top out at 70% CLTV, while the highest ceilings sit on owner-occupied and second-home lines at stronger credit.
• Pricing floats through the draw and repayment periods and never converts to fixed, so the payment can rise before the unit is leased.

What Is a Bank Statement HELOC?

It is an industry label, not a federal loan category. The product is a standalone line of credit secured by the home, in first or second lien position. The borrower can draw, repay, and draw again during the draw period. The “bank statement” part describes only how income is documented. Credit, equity, occupancy, and the property are all still reviewed.

Alternative documentation is not the same as no documentation. A file is reviewed on documented income under the applicable program, subject to lender guidelines. That matters for self-employed owners whose tax returns show heavy write-offs, because taxable income can sit well below real cash flow.

An ADU is not its own loan type here. The HELOC is secured by the main property. The ADU is where the money goes, and later it may become part of what a lender sees on the property. Whether it counts for anything depends on appraisal and permit status.

Lendmire is a mortgage broker, not a lender. It places these lines through select wholesale partners, and every figure below is subject to lender guidelines and full file review. This product runs only in the 16 states where Lendmire operates as a full-service brokerage, which is narrower than its DSCR footprint of 41 markets including Washington, D.C.

How Underwriting Treats the File, Step by Step

The sequence below is how these files move through review.

1. Pick the statement window and account type. The program sets the window, commonly one to two years of deposits. Business accounts get an expense factor that reflects the type of business, staffing, contractor use, and structure. The borrower does not choose the factor.

2. Clean the deposits. Underwriters strip out transfers between the borrower’s own accounts, refunds, loan proceeds, and one-time deposits. Personal and business money mixed in one account makes this step slower and usually lowers the usable total.

3. Compute qualifying income and debt-to-income. The deposit income qualifies the person, not the property. The maximum DTI on this network is 50%, and it drops to 45% for credit profiles from 600 to 679. A ratio above 45% requires at least a 680 score. The payment is figured on the interest-only amount at the maximum draw, so it reflects a fully used line.

4. Size the line by combined loan-to-value. CLTV is every lien, including the new line, divided by property value. The lender applies a percentage to value and subtracts what is already owed. The value used is today’s value of the home as it stands. Equity that a finished ADU might create later is not counted in advance.

5. Review credit, title, and property. The network’s credit floor is 600 on a primary residence, 640 on a second home, and 700 on an investment property. Title must be held by the individual borrower or a revocable living trust. An LLC cannot hold title on this product, which is the sharpest structural difference from a DSCR loan.

6. Order the valuation. Lines at or below $500,000 ordinarily run an automated valuation with no traditional appraisal. A higher CLTV may require a secondary valuation, and a borrower can ask for a full appraisal in any case. Every line above $500,000 requires one.

7. Close and draw. At least 75% of the line is drawn at closing. That detail shapes the whole ADU plan, covered below.

8. Plan the exit before closing. Most ADU borrowers intend to refinance the line once the unit is built and rented. A line left in place can only be paid down or paid off, and a sale generally forces a full payoff.

What the Ceilings Look Like by Occupancy

The ceiling depends on which home secures the line, so there is no single number for all files. Every figure below is typical network guidance, not a promise.

The 90% ceiling exists only at a 720-or-better profile, and only up to $500,000. Lower credit tiers step the CLTV down. A line above $500,000 is primary-residence only. It needs a 700 or better credit profile (720 on the 5-year-draw structure described next), caps at 75% CLTV, and requires a full appraisal.

Investment-property lines here stop at 70% CLTV with no tier above it.

Why the Draw Structure Complicates an ADU Build

The network offers two draw structures on primary residences and second homes. One has a 3-year interest-only draw followed by a 17-year repayment period. The other has a 5-year draw followed by 25 years of repayment. Investment lines use the 5-year structure only. Tennessee shortens both.

Here is the catch for builders. A HELOC is usually sold as a line you draw on as costs come due, which suits a multi-month build. On this network, at least 75% of the line is drawn at closing. Money sits in the borrower’s account before the contractor needs it, and interest accrues on it.

That does not make the product wrong for an ADU. It means the borrower should size the line near the real build budget rather than the maximum available. A smaller line also keeps CLTV lower.

Repayment is the other risk. Per the CFPB’s HELOC guidance, borrowing stops when the draw period ends and repayment begins, and monthly payments are often much higher once it does. In some plans the whole balance comes due at that point. The CFPB’s HELOC brochure adds that payments can change even if the borrower draws no more.

On this network pricing floats across both the draw and repayment periods. It never converts to fixed. During construction there is no rent coming in. The borrower carries a floating payment until the unit is leased, so qualifying DTI should leave room for that stretch.

Owner-Occupied, Second Home, or Rental: Where the Plan Changes

Occupancy changes leverage, credit, and exit options more than anything else in the file.

On an owner-occupied home, the ADU often houses family or becomes a rental next to the owner’s residence. This tier has the widest leverage and the lowest credit floor. It is also the only tier where a line above $500,000 is available.

On a second home, the ceiling reaches 90% CLTV at 720 or better, but the credit floor is 640.

On a property already held as a rental, the investment tier applies. Credit starts at 700, CLTV stops at 70%, and the line caps at $500,000. A rental-occupancy owner who planned to build an ADU on 80% leverage will find this tier tighter than expected. Every figure here varies by lender and program — guidelines, property type, leverage, and credit profile all apply.

Property type matters too. Single-family, 2-4 unit, PUD, townhome, and condominium properties, including non-warrantable condos, are eligible. Manufactured homes, co-ops, condotels, log homes, and commercial, mixed-use, or agricultural zoning are not.

Exposure limits apply across the whole portfolio. A borrower is limited to three lines in total, and an owner with more than 15 financed properties is not eligible.

Short business history is a program-by-program question. A business under 24 months old may be weighed on liquid assets and credit alongside a shorter statement history. Some programs will not work with it at all.

Where the General Rule Breaks

These are the edge cases that derail ADU files most often.

The ADU is unpermitted. An unpermitted unit likely adds no appraised value, and its rent will not be counted by any later lender. The line may still close on the existing home’s equity, but the exit gets harder.

The ADU appraises below build cost. ADUs often appraise for less than they cost to build, because comparable sales are thin. Equity the borrower expected to see afterward may be partly trapped in the unit. A later cash-out refinance or a second line will be sized on that appraised value, not on the budget.

The property sits in an LLC. Title in an LLC, corporation, partnership, or irrevocable or land trust is ineligible. A property already deeded to an LLC needs a vesting change first, or a DSCR cash-out refinance instead. Moving title can have its own consequences, so that step deserves separate advice.

The property is listed or recently listed. In Indiana, North Carolina, Pennsylvania, Tennessee, Texas, and Washington, a property listed for sale or listed within the past 60 days is ineligible. In Texas, a primary residence carries extra homestead limits, including an 80% combined cap.

The borrower sells before repayment. A sale generally requires paying the HELOC off in full right away. Anyone planning to sell the main home with the ADU in place should treat the line as short-term debt.

Credit history has derogatory marks. A bankruptcy needs 4 years of seasoning from discharge or dismissal. Foreclosure-family history splits by program. One seasons a foreclosure at 7 years and a deed-in-lieu, pre-foreclosure, or short sale at 4. The other declines that history regardless of age.

Tax treatment can depend on how the funds are used and how the property is held; borrowers should keep clear records and speak with a qualified tax professional before relying on any deduction.

How the Exit Works, and Where DSCR Fits

Rent from a finished ADU does not qualify the HELOC. It can matter for the next loan, and that is where DSCR comes in. A DSCR loan compares a property’s rent to its full monthly housing obligation (principal, interest, taxes, insurance, and any HOA dues). The complete DSCR loans guide explains the formula.

Many select DSCR programs start at 1.00 coverage, and stronger ratios open better leverage and terms. A separate select-lender path goes below 1.00 with leverage and terms adjusted. Clearing 1.00 is not the same as positive cash flow, because repairs, vacancy, management, utilities, and capital costs sit outside the calculation.

A DSCR cash-out refinance tops out around 75% LTV across most of the network, and about 6 months of seasoning is the common expectation. Whether the ADU’s rent counts depends on the unit being legal, permitted, and appraised properly. The path from a bank statement HELOC to a DSCR refinance works best when the permit file was clean from the first day. Final terms depend on lender guidelines, property type, leverage, and the borrower’s complete credit picture.

LLC eligibility on DSCR files depends on program terms. For more on the first two paths, see Lendmire’s piece Best Bank Statement HELOC Program for an Accessory Dwelling Unit and its explanation of bank statement cash-out refinance requirements for an ADU build.

What the Investor Decision Looks Like in Practice

The line suits an owner who has a low first mortgage worth keeping, real equity, documented deposits, and a build budget that fits within the CLTV ceiling. It also suits an owner who can carry a floating payment without any rent during construction.

It fits poorly when title sits in an LLC, when the ADU is unpermitted, or when the build budget needs leverage above the occupancy ceiling. It also fits poorly when the plan depends on the finished unit’s value to fund the build.

Before applying, organize these items:

• Statements for the full window the program sets, with business and personal accounts separated where possible.
• A permit and plan file for the ADU.
• A clear vesting record showing individual or revocable-trust title.
• A build budget with a contingency, so the line is sized to the real need.

Key Terms Defined

CLTV: Combined loan-to-value, meaning all liens on the property divided by its value.

Draw period: The stretch when the borrower can take money from the line and pay interest only.

Repayment period: The stretch after the draw period when the balance amortizes and payments typically rise.

Expense factor: The percentage a lender subtracts from business deposits to estimate usable income.

DSCR: Debt service coverage ratio, which compares a property’s rent to its monthly housing obligation.

Vesting: The legal form in which the borrower holds title to the property.

If you are considering a home equity line 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. Call 828-256-2183 or request a quote.

About Lendmire

Lendmire (NMLS# 2371349) is a mortgage broker. Home equity lines of credit — on a primary residence, a second home or an investment property — are arranged through wholesale lenders in Lendmire’s 16 full-service states, and every line is underwritten by the lender under its program guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. CFPB’s HELOC guidance

2. CFPB – HELOC brochure