The Quick Read: The best program for your situation is the one that fits four things at once: the property securing the line, the equity that counts today, how your income is documented, and how the draws will pay for the ADU build, subject to lender guidelines. Lenders size the line on the home as it stands now, not on the finished unit or its future rent. Lendmire is a broker that matches the file to a wholesale program, and this HELOC product is available only in 16 states.
- Equity counts as of today. Combined loan-to-value (CLTV) uses the current value of the property. The finished ADU does not raise it.
- Occupancy sets the ceiling. Investment-property lines top out at 70% CLTV. Primary-residence and second-home lines reach 90% only at a 720-or-better credit profile.
- Most of the line is funded at closing. At least 75% is drawn on day one, so interest starts before the contractor is paid.
- Title matters. The borrower or a revocable living trust must hold title. An LLC cannot.
- Rent is not income yet. An ADU that is not built and leased does not help qualify.
What a Bank Statement HELOC Does for an ADU Owner
A bank statement HELOC is a revolving equity line where income is documented from 12 or 24 months of deposits instead of tax-return income. It is still underwritten for credit, equity, and property. The lender wants to see that the deposits are real, recurring, and large enough to carry the payment.
How large a line the equity supports.
An equity line is sized by combined loan-to-value, occupancy, and credit — not by rental coverage. Switch the occupancy or the credit band and the ceiling moves with it.
Investment-property lines require a 700 minimum credit score; second-home lines start at a 640 minimum and primary-residence lines at 600, and the combined-LTV ceiling steps down as the credit band drops on primary-residence and second-home lines and holds on investment-property lines; the line cap steps down on primary-residence lines and holds at every tier on investment-property and second-home lines.
A debt-to-income ratio above 45% requires 680+ credit. Profiles under 640 are limited to single-family homes. At least 75% of the approved line is drawn at closing. Ceilings, floors, and caps update from Lendmire’s centralized guideline source.
Line estimate
Illustrative estimate only — not a quote, Loan Estimate, approval, or commitment to lend. The rate is an editable assumption; equity-line pricing is variable through both the draw and repayment periods and never converts to fixed. Occupancy and credit drive the ceiling together: an investment property tops out at 70% combined LTV (minimum credit 700, line cap $500,000); a second home tops out at 90% combined LTV (minimum credit 640, line cap $500,000), with the ceiling stepping down as the credit band drops (the cap holds at every tier); a primary residence tops out at 90% combined LTV (minimum credit 600), and its $750,000 maximum line is available only at 75% combined LTV or below with a 700-or-better credit profile (720 on the longer-runway program) and a full appraisal. Lines above $500,000 require a full appraisal. Credit, debt-to-income, property type, and full underwriting review all affect the final line.
Self-employed owners use it because write-offs shrink the income on a tax return. The ADU is a natural fit for the borrower who wants to keep the first mortgage in place, draw only what the build needs, and avoid refinancing the whole balance.
The catch is structural. An ADU build spends money over months against equity that exists today. The unit’s value and rent do not exist until it is finished. Every program decision below comes back to that gap.
On bank statement files, the documentation path is the first filter. Some programs allow personal statements, some allow business statements, and some allow only one. Business-account deposits usually take a program-set expense factor. A CPA-prepared profit-and-loss statement can support a different factor. Qualification runs on documented income under the applicable program, subject to lender guidelines.
How to Judge “Best” (It Depends on the File)
No single program is best for every borrower. The program that works depends on the property, the credit profile, the leverage needed, the documentation, and the state. A broker that shops several wholesale lenders can match the scenario to the program whose overlays fit. Here is the fit test.
| Criterion | Why it matters for an ADU | What gets checked |
|---|---|---|
| Occupancy | Sets the CLTV ceiling | Primary, second home, or rental |
| Credit tier | Sets leverage and line size | Single-bureau score, tradelines |
| Vesting | LLC title is not eligible | Individual or revocable trust |
| Draw structure | Drives carry during the build | Draw and repayment terms |
| Documentation | Deposits must support the DTI | 12 or 24 months of statements |
| State | Availability and overlays differ | One of the 16 states |
If two programs both clear the test, the tiebreaker is usually the draw structure. A long build with a slow lease-up wants more runway before repayment begins.
The Program Snapshot by Occupancy
The ceiling depends on occupancy, so no single number applies to every ADU file. These are typical ranges from select wholesale-network guidelines. They are not a commitment to lend.
Two wholesale programs sit behind these figures. One is built for higher leverage. The other is the longer-runway option, which carries the longer draw and repayment. Where they differ, each figure applies only within its own program’s terms.
| Occupancy | Max CLTV | Credit floor | Max line |
|---|---|---|---|
| Primary residence | 90% at 720+ | 600 | $750,000 |
| Second home | 90% at 720+ | 640 | $500,000 |
| Investment property | 70% | 700 | $500,000 |
Lower credit tiers step the ceiling down. On a primary residence, a 700 profile reaches 85% CLTV on lines up to $500,000. A 640 profile reaches 80%. At 600 the ceiling is 60%. Second homes at 660 reach 80%, and at 640 they reach 75%.
A line above $500,000 is a primary-residence product only. It requires a credit profile of 700 or better (720 on the longer-runway program), caps at 75% CLTV, and needs a full appraisal.
Other program terms that matter for a build:
- Draw structures. Primary residences and second homes have two: a 3-year interest-only draw with a 17-year repayment, and a 5-year draw with a 25-year repayment. Investment lines use the 5-year draw and 25-year repayment only. Tennessee shortens both structures.
- Pricing. It floats through the draw and the repayment period and never converts to fixed.
- DTI. Maximum 50%, or 45% for credit profiles from 600 to 679. A ratio above 45% requires a 680 minimum. The payment is qualified on the interest-only payment at the maximum draw.
- Exposure. A borrower may hold up to three lines, and anyone owning more than 15 financed properties is not eligible.
How Underwriting Treats the File, Step by Step
This is the order a file moves through review.
1. Pick the documentation path. Personal statements, business statements, or a profit-and-loss route. Confirm the program allows the one you need before anything else.
2. Pull 12 or 24 consecutive months of statements. Keep personal and business money separate. Explain large or unusual deposits up front.
3. Scrub the deposits. Transfers between your own accounts, loan proceeds, refunds, and one-time items come out. What remains is averaged, and the expense factor applies to business deposits.
4. Test income against debts. The new line, the first mortgage, and every other obligation go into the DTI. The line is tested at its interest-only payment on the full draw, not just what you plan to use.
5. Test equity. The first mortgage plus the new line, divided by current value, is the CLTV. The ADU’s finished value is not in the number.
6. Clear the file items. Credit report no more than 90 days old at closing, title and vesting, insurance, and the valuation.
Valuation is where ADU owners get surprised. Lines at or below $500,000 ordinarily run an automated valuation with no traditional appraisal. A higher CLTV may require a secondary valuation. A borrower may request a full appraisal in any case, and every line above $500,000 requires one. An automated value will not reflect a half-finished build.
The CFPB’s HELOC booklet describes the same basic sizing logic. Lenders typically take a percentage of appraised value, subtract the mortgage balance owed, and weigh repayment ability and credit history.
How Much Line You Can Actually Get
The math is subtraction. The CLTV ceiling minus what is already owed, as a share of value, is the room for a new line. The program’s maximum line size then caps it.
Take a primary residence with a 720-plus profile and a first mortgage at 40% of value. At the 90% ceiling, the line could reach 50% of value, still capped at the program’s line maximum. Now take a 700 profile on the same house. The ceiling is 85%, so the room shrinks to 45% of value.
Run an investment property with the same 40% first mortgage. The ceiling is 70%, so the room is 30% of value at most, and the credit profile must be 700 or better. Texas primary residences are homesteads and cap at 80% CLTV, so the top tiers above that figure never apply there.
Now compare that room to the build. Investor anecdotes suggest an ADU rarely adds equity dollar for dollar. One BiggerPockets thread on ADU build financing puts the gain at roughly fifty to seventy cents of equity per dollar spent. Treat that as one investor’s experience, not a benchmark. The practical point holds: an improvement may support a higher appraised value, depending on comps and underwriter review. It does not pay back its own cost automatically.
The Draw-at-Closing Problem
At least 75% of the line is drawn at closing on both programs. That cuts against the usual picture of a HELOC as a slow, phased draw.
Picture an owner with a six-month build. Three-quarters of the line is funded on day one and interest begins immediately. The contractor’s draw schedule might not demand most of that money until the framing and mechanical phases. The owner is carrying interest on cash sitting in an account.
A few habits keep this clean:
- Size the line to the build budget plus a contingency, not to the maximum equity allows.
- Park unused proceeds in a way that does not complicate the deposit history.
- Know the minimum subsequent draw after closing, which is $1,000 (Texas is $4,000).
- Model the interest-only carry through permitting delays, not just construction.
The CFPB’s HELOC brochure explains why the draw period matters. The interest-only draw ends, repayment begins, and the payment resets. A build that runs long and a lease-up that drags can both land in the repayment period. Match the draw structure to the realistic timeline, including the vacancy before the first tenant.
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.
Does ADU Rent Count?
No. Not before the unit exists and is leased.
A bank statement HELOC reads the borrower’s deposits and the property’s current equity. Rent from a unit that has not been built is not in the deposit history. Rent from a finished unit becomes usable only after tenants pay it into the account. A signed lease plus matching deposits starts to help once the unit is occupied.
For contrast, conventional agency guidelines are conservative here too. Under those guidelines, projected rent can be used only if rent starts by the first mortgage payment date, so a unit still under construction cannot count. An ADU is defined as having at least a kitchen, a bathroom, and a separate entrance. A garage conversion without those features may not qualify as an ADU.
Rent from an illegal unit cannot be used. That is an agency rule, not a DSCR rule, but it points at the same file risk. An unpermitted unit is a problem for the appraisal, for the rent, and for the exit.
Where the Rule Breaks
These are the edge cases that derail ADU files.
LLC-held property. LLCs, corporations, partnerships, and irrevocable, blind, or land trusts cannot hold title on this product. It is the sharpest difference from a DSCR loan. A property already deeded to an LLC needs a vesting change or a different structure. A DSCR cash-out refinance is the usual alternative, per lender program requirements.
Ineligible property types. The line covers single-family, 2-4 unit, PUD, townhome, and condominium properties, including non-warrantable condos. The 2-4 unit type needs a 640 minimum on the longer-runway program. Manufactured homes, co-ops, condotels, log homes, commercial, mixed-use, and agricultural-zoned properties are not offered. Modular factory-built homes are eligible on the longer-runway program only.
Unpermitted or partial builds. A unit without permits or without a kitchen, bath, and separate entrance creates valuation and exit problems. Permit status should be settled before the application.
Appraisal shortfall. When the finished unit appraises below its cost, the owner is stuck with the gap. One BiggerPockets thread on a HELOC exit strategy describes this cost trap after a build. The line does not shrink to match.
Two ADUs or a lot split. Financing gets harder as the project grows. Leverage caps, DTI, and the three-line exposure limit all bind sooner.
Foreclosure-family history. The programs split here. On primary residences and second homes, one program seasons a foreclosure at 7 years and a deed-in-lieu, pre-foreclosure, or short sale at 4. The other declines the history entirely. A bankruptcy needs 4 years of seasoning from discharge or dismissal on both. Investment files follow the 7-and-4 path.
State rules. Texas primary residences face a 12-day waiting period, a one-lien-at-a-time rule, and 12-month seasoning. Texas second homes and investment properties are eligible as non-homestead transactions. A property listed for sale, or listed within the past 60 days, is ineligible in NC, PA, TN, TX, and WA. New Mexico and Ohio cap CLTV based on the credit profile.
Sub-640 profiles. They are limited to single-family residences with a clean 12-month housing history under the longer-runway program. Because second homes floor at 640 and investment at 700, that limit reaches primary residences only.
Which Tool Fits Which Situation
The right product depends on which side of the loan is being tested: the borrower’s deposits or the property’s rent.
| Option | Tests mainly | Fits when |
|---|---|---|
| Bank statement HELOC | Borrower deposits and equity | Owner lives in the home and wants a draw line |
| DSCR cash-out refinance | Rent against the payment | A rental already leased, held in an LLC |
| DSCR refinance after the build | Rent from the finished unit | The ADU is built, rented, and appraised |
For the owner-occupied home, a DSCR loan does not apply. 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.
On a rental property, DSCR cash-out is a real alternative. The network tops out around 75% LTV on a cash-out, with about 6 months of seasoning as the common expectation. Coverage of 1.00 is where select programs start, and stronger ratios open better pricing and leverage. Coverage below 1.00 is available through select lenders in the network, with leverage and terms adjusted. These specifics are subject to lender guidelines and a full review of property, leverage, and credit.
The two-step path is common. Fund the build with the line, lease the unit, then refinance into a long-term DSCR loan once the unit is rented and appraised. That loan compares rent to PITIA only. Clearing 1.00 is not the same as positive cash flow, because repairs, vacancy, management, and capex sit outside the calculation.
For more on the mechanics, see Lendmire’s piece How to Use a DSCR HELOC for an Accessory Dwelling Unit. For a duplex or fourplex with an ADU added, see the bank statement HELOC requirements for a 2-4 unit property. The complete DSCR loans guide covers the long-term loan that often follows the build.
Key Terms Defined
Bank statement HELOC. A revolving equity line qualified on 12 or 24 months of deposits instead of tax-return income.
ADU (accessory dwelling unit). A secondary unit on the same lot with its own kitchen, bathroom, and entrance.
CLTV. The first mortgage plus the new line, divided by the property’s current value.
Draw period. The window when the borrower can use the line and pay interest only, before repayment starts.
Expense factor. The share of business deposits treated as expenses and removed from qualifying income. The program sets it.
DSCR. A ratio that compares a property’s rent to its full monthly obligation (PITIA).
Frequently Asked Questions
Can the finished ADU’s value increase my line?
No. The line is sized on the property’s value as it stands at underwriting. Lines at or below $500,000 ordinarily use an automated valuation. A full appraisal is required above $500,000, and a borrower may request one at any size. An appraiser looking at a half-built unit will not credit the finished value.
Can I use this line on a rental property that has an ADU?
Sometimes. Investment lines are available at up to 70% CLTV with a 700 or better credit profile, and the maximum line is $500,000. Title must be held by the individual or a revocable living trust. If the property sits in an LLC, a DSCR cash-out refinance is the more likely fit, per lender program requirements.
Does the ADU rent help me qualify?
Not before it exists. A bank statement HELOC is underwritten on your deposits and current equity. Once the unit is rented and the payments land in your account, that history can support later files, including a long-term DSCR loan on the property.
What credit profile do I need?
The program floor is 600, but leverage rises with the score. Primary residences reach 90% CLTV only at 720 or better. Second homes floor at 640 and investment lines at 700. A line above $500,000 needs 700 or better (720 on the longer-runway program).
What if I want to build in a state outside the 16 states?
This product is available only in AL, CA, CO, FL, GA, IN, MI, MT, NM, NC, OH, PA, TN, TX, VA, and WA. That is narrower than Lendmire’s 41-market DSCR footprint. Outside those states, the DSCR route on a rental may still apply.
Next Step
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. Lendmire is a broker that works with select wholesale lenders, so the match depends on your file. Program terms change, and every file is reviewed individually. An illustrative calculator on the site can help you estimate the equity room before you apply.
About Lendmire
Lendmire (NMLS# 2371349) is a mortgage brokerage serving homeowners and real estate investors in its 16 full-service states. Home equity lines of credit are arranged through wholesale lending channels; Lendmire brokers the line and the lender underwrites each application under its occupancy-based 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
2. BiggerPockets: ADU build financing
4. BiggerPockets: HELOC for ADU exit strategy
This article is part of Lendmire’s bank statement HELOC program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Should a Rental Investor Use a DSCR Loan or a Bank Statement Loan? · Can You Get a Bank Statement HELOC on a Home Held in a Revocable Trust? · Bank Statement HELOC vs Cash-Out Refinance With No Minimum Draw Requirement
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Compliance and disclosures. Lendmire (NMLS# 2371349) is a licensed mortgage broker and is not a direct lender, depository institution, financial advisor, or tax professional. Content in this article is general market analysis and educational information — not financial, legal, or tax advice for any specific situation. Lendmire does not guarantee loan approval; every transaction is subject to underwriting by the funding lender. Mortgage pricing and loan program guidelines are subject to change at any time without notice and vary by borrower characteristics, property type, and state regulations. Lendmire complies with Equal Housing Opportunity. Licensure verification: NMLS Consumer Access.