The Quick Read: Funding a second small home on your lot with a deposit-qualified equity line comes down to two tests. Your bank deposits have to support the new debt, and the equity you hold today has to cover the line. Rent from the planned unit does not count on either test.
- Income is tested through your deposits, so the future tenant’s rent does not help you qualify.
- The line is sized on your home’s value today, not its value after the build.
- Which lenders fit depends on your occupancy type, credit profile, and how much leverage you need.
- On Lendmire’s network, an investment property tops out at 70% CLTV, and 90% exists only for primary residences and second homes at a 720-or-better credit profile.
- Rent-based underwriting belongs to the DSCR loan, which typically comes after the unit is built and rented.
Lendmire is a mortgage broker, not a lender. It places DSCR investor loans across 41 markets, Washington, D.C. included. Its equity-line programs are narrower, available only in 16 full-service states. The brokerage shops a network of wholesale HELOC lenders and matches your file to the program that fits. That matching is the real answer to “which lenders,” because the choice depends on the file. Every figure below is subject to lender guidelines and full file review.
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.
Key Terms Defined
HELOC is a home equity line of credit. It is a revolving credit line secured by your property, and you borrow against it as needed.
Bank statement income is a documentation method for self-employed borrowers. The lender totals eligible deposits over a set window and converts them to monthly income.
Accessory dwelling unit (ADU) is a small, separate living space on the same lot as a main home. Think backyard cottage, garage conversion, or basement apartment.
CLTV is combined loan-to-value. It adds your first mortgage and the new line, then divides by the property’s current value.
Draw period is the stretch when you can borrow from the line, usually with interest-only payments.
Repayment period is the stretch after the draw ends, when you pay down principal and interest on a set schedule.
DSCR is the debt service coverage ratio. It compares a property’s rent to its full monthly housing obligation (principal, interest, taxes, insurance, and any association dues).
What Does This Loan Actually Test?
It tests two separate things: your cash flow and your collateral. Your deposits answer the first. Your equity answers the second. The ADU appears in neither answer, because the unit is not built yet and a deposit-based line ignores projected rent.
That surprises many investors. They assume a rentable unit helps them qualify. It doesn’t, not here.
Self-employed borrowers use this route because tax returns often understate real cash flow after write-offs. Scotsman Guide describes the mechanism: a borrower with no W-2 supplies 12 to 24 months of personal or business bank statements. The lender then computes qualifying income, and its example applies a 50% expense factor to business deposits. Treat that 50% as an illustration. Each program sets its own factor.
The same article makes a point worth repeating. Lenders still have to confirm that you can repay, and credit still has to be good. Deposits are your documentation. They are not a loophole.
On our network, a line is reviewed on documented income under the applicable program, subject to lender guidelines. The ceiling on debt-to-income is 50%. It drops to 45% for credit profiles from 600 to 679, and anything above 45% needs at least a 680 score. The line is qualified on the interest-only payment calculated on the maximum draw, not on what you plan to draw. Which documentation methods a given lender accepts varies, and that is a major reason to shop the file rather than apply cold.
How Underwriting Treats Your File, Step by Step
Underwriting runs in a fixed order: documentation, income conversion, credit, collateral, then structure. A weakness at any step can stop the file, and each step is checked on its own.
1. Pick the documentation path. Personal statements, business statements, or a profit-and-loss statement from a tax professional. The window is commonly 12 to 24 months.
2. Convert deposits to monthly income. Eligible deposits are totaled and averaged over the window. Business accounts take an expense factor. Transfers between your own accounts, loan proceeds, and refunds are normally screened out. Programs differ on the details.
3. Check credit and debts. The lender pulls credit, counts your existing obligations, and tests the debt-to-income ratio against the limits above.
4. Value the property and size the line. Value comes from an automated valuation or an appraisal. CLTV is checked against the occupancy tier you fall in.
5. Confirm title and vesting. The borrower on the line must hold title personally or through a revocable living trust.
6. Set the structure. You choose a draw and repayment structure, covered below.
A CFPB explainer on lines of credit notes that lenders may also charge appraisal and other up-front costs. Budget for those before the build starts.
How Is the Line Sized When the Unit Doesn’t Exist Yet?
The lender sizes the line on today’s appraised value, not the finished ADU’s value. Whatever room is left between your first mortgage and your CLTV ceiling is what the line can use. The planned unit adds nothing to that room until it exists and is appraised.
Run the numbers on a hypothetical primary residence. Say your first mortgage equals 50% of the home’s current value and your credit profile is 700 or better. At a 75% CLTV ceiling, the line can use up to 25 points of value. Cap that same home at a 70% investment-property ceiling, and you get 20 points. Same house, five points of difference. Occupancy changes the answer.
Now add the guardrails. Lines at or below $500,000 ordinarily run an automated valuation with no traditional appraisal. A higher CLTV may require a secondary valuation, and you can request a full appraisal in any case. Every line above $500,000 requires one.
Here are the verified tiers by occupancy on Lendmire’s network:
| Occupancy | Minimum credit | Ceiling | Maximum line |
|---|---|---|---|
| Primary residence | 600 | 90% CLTV (720+ only) | $500,000 at 90% CLTV; $750,000 at 75% CLTV, 700+ (720 on the longer-runway program) |
| Second home | 640 | 90% CLTV (720+ only) | $500,000 |
| Investment property | 700 | 70% CLTV | $500,000 |
The 90% ceiling on a primary residence or second home applies only at 720 or better, and only on lines up to $500,000. On a primary residence, a line above $500,000 needs 700 or better (720 on the longer-runway structure) and caps at 75% CLTV. An investment property, by contrast, stays at 70% CLTV on this network.
Where Does Income Qualification Differ From a DSCR Loan?
A DSCR loan tests the property. An equity line tests you. The two answer different questions, which is why they work in sequence rather than as alternatives.
Property-rent-based lender review belongs to the DSCR family. The lender divides gross rent by the full housing payment. Clearing 1.00 is where many select programs start, and a separate select-lender path takes coverage below 1.00 with leverage and terms adjusted. Stronger ratios open better pricing and leverage. Coverage is not the same as cash flow, though, since repairs, vacancy, management, and utilities sit outside the calculation. The complete DSCR loans guide walks through the math.
Because DSCR counts rent, the property has to be rentable when the loan is made. That is why a DSCR loan can’t fund raw construction. It can refinance the building once the unit is finished and leased. The brokerage covers that second step in its piece How Lenders Underwrite a Bank Statement Cash-Out Refinance With an Accessory Dwelling Unit.
| Product | Income proof | Does ADU rent count? | Best fit |
|---|---|---|---|
| Bank statement equity line | 12-24 months of deposits | No | Building the unit |
| Traditional equity line | Tax returns, W-2s | No | Salaried owners |
| DSCR cash-out refinance | Property rent vs. payment | Yes, once leased | Finished, rented unit |
| Construction loan | Varies by lender | Depends on lender | Larger or full builds |
What Structures Exist?
Lendmire’s wholesale partners offer two draw structures on primary residences and second homes. The shorter-runway structure has a 3-year interest-only draw followed by a 17-year fully amortizing repayment. Investment lines run only the longer-runway structure.
Both share features that matter for an ADU:
- At least 75% of the line is drawn at closing.
- Pricing floats through both the draw and repayment periods and never converts to a fixed payment.
- A minimum subsequent draw applies after closing, which the longer-runway structure states as $1,000.
- The line can sit in first or second lien position.
- A borrower is limited to three lines, and anyone owning more than 15 financed properties is not eligible.
That first bullet changes the usual picture. The textbook story says you draw only what each construction stage needs. On this network, most of the line is drawn up front, and interest-only carry starts on that balance immediately. Staged draws help less than the standard HELOC explanation suggests. If your build budget is smaller than the line you’d qualify for, size the line to the budget, not to the maximum.
The usual structure of these lines is also worth knowing. The CFPB describes a draw period that could last 10 years, for example, followed by a repayment period that is often ten or 20 years. The CFPB also says that with an existing mortgage, a line is a second mortgage payable on top of the first, with payments that move with the balance.
Where Do the Standard Rules Break?
Occupancy. A line on a home you live in is priced and sized differently from a line on a pure rental. If you plan to lease the ADU, the classification of the property matters. Renting your home to others may be prohibited under the terms of your credit line. Read the agreement before you sign a lease with a tenant.
Vesting. Title has to sit with you personally or in a revocable living trust. LLCs, corporations, partnerships, and irrevocable, blind, or land trusts cannot hold title. This is the sharpest structural difference from a DSCR loan, which can lend to an entity subject to program terms. If the property is already deeded to an LLC, you need a vesting change or a DSCR cash-out instead.
Property type. Single-family, 2-4 units, PUDs, townhomes, and condominiums are eligible, including non-warrantable condos. Modular factory-built homes are eligible on the longer-runway structure only. Manufactured homes, co-ops, condotels, log homes, and commercial, mixed-use, or agricultural-zoned properties are not eligible. A 2-4 unit property needs a 640 minimum on the longer-runway structure.
Permits. Appraisal treatment of unpermitted space can range from full value to no contributory value. Entrepreneur’s Report lays out a three-bucket framework for this. Build with permits. It protects the appraisal you will need later.
A frozen or reduced line. Your lender can freeze or reduce the line if it reasonably believes a material change in your finances means you can’t pay. Mid-build is a bad time to learn that.
How Does the Whole Sequence Play Out?
Most investors use this line as a bridge, not a permanent loan. The order runs like this:
1. Match the file to a program and a structure.
2. Close the line, drawing at least 75% at closing.
3. Build the unit and carry the interest-only payment.
4. Finish, permit, and lease the unit.
5. Have the property appraised with the unit included.
6. Refinance into a DSCR loan, which has to pay off the line.
Step six deserves a plan. A second lien sits behind your first mortgage and affects later refinancing. A DSCR cash-out refinance typically tops out near 75% LTV across the network, with roughly six months of seasoning as the common expectation. Credit floors, reserve rules, and property eligibility still apply. A larger down payment never erases them. The strongest files clear both tests: enough equity and enough rental coverage.
Keep an eye on the clock built into the line itself. The draw period ends, and the payment steps up to full principal and interest. If the build runs late and the unit isn’t rented, that step-up lands on an empty unit. The same goes for a variable-pricing line during a long build.
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.
What Should You Prepare Before You Apply?
Prepare the deposits, the budget, and the paperwork trail. Lenders read a clean file faster than a messy one.
- 12 to 24 months of personal or business statements, depending on the program.
- A profit-and-loss statement from a tax professional, if that path fits your lender.
- A project budget, contractor bid, and permit status for the ADU.
- Your first mortgage statement and proof of current title and vesting.
- A clear picture of what you owe, since your total debts feed the 50% DTI limit.
Avoid the common slip-ups. Large unexplained deposits can get screened out, so keep transfers between your accounts labeled. Don’t mix personal and business funds without a record. Don’t borrow against a line you can’t carry at the interest-only payment calculated on the maximum draw.
So Which Lenders Fit Your Situation?
The best program for your situation depends on your occupancy type, credit profile, leverage need, and documentation. A broker that shops multiple wholesale lenders can compare how each treats your deposits, your property, and your timeline. Here is how the decision usually splits.
A primary residence at 700 or better, with modest leverage and a smaller line, has the widest choice of structures. A second home at 640 or better has fewer options, and an investment property needs 700 and tops out at 70% CLTV. A self-employed borrower whose bank statement deposits are strong but whose tax returns are thin is the profile this route exists for. A borrower who needs more than the equity can supply may be better served by a construction loan or by waiting until the unit is built for the DSCR refinance.
This is a decision about leverage, and the leverage you can get depends on what you own and how you use it.
Frequently Asked Questions
Does projected ADU rent count toward qualifying?
No. A deposit-based line tests your bank deposits, not the rent a future tenant might pay. Rent first counts in a DSCR refinance, once the unit is leased and the property is appraised with it. Plan to qualify on your own documented income for the build.
Can an LLC borrow on this line?
Not on Lendmire’s network. Title must be held by you personally or by a revocable living trust. LLCs, corporations, partnerships, and irrevocable, blind, or land trusts cannot hold title on these lines. A property already deeded to an LLC needs a vesting change, or a DSCR cash-out refinance, which can lend to an entity subject to program terms.
Is the line fixed or variable?
Variable. On this network, pricing floats across both the draw and repayment periods and never converts to fixed.
How long a statement history do I need?
Twelve to twenty-four months is the common range, according to Scotsman Guide. The exact window and the minimum time in self-employment vary by lender and program, which is part of how a broker matches your file.
Will an appraisal be required?
For lines at or below $500,000, an automated valuation ordinarily replaces a traditional appraisal, though higher CLTV may require a secondary valuation. Every line above $500,000 requires a full appraisal. You can also request one in any case, which can make sense if you believe your home is worth more than an automated estimate.
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. Reach the team at 828-256-2183 or request a quote. The site’s calculator gives an illustrative estimate only, not a quote or a commitment to lend.
Build the unit on the equity you have, and refinance into rental coverage once there is a tenant in it.
About Lendmire
Lendmire, NMLS# 2371349, is a mortgage brokerage that arranges home equity lines of credit through wholesale lending partners in its 16 full-service states. Lines on primary residences, second homes and investment properties are each reviewed individually by the lender under the program’s occupancy, credit and combined-loan-to-value 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. CFPB
3. CFPB – HELOC vs home equity loan
This article is part of Lendmire’s bank statement HELOC program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Best Bank Statement HELOC Program for an Accessory Dwelling Unit · Top Bank Statement HELOC Providers for an Accessory Dwelling Unit · Banks That Offer a Bank Statement HELOC for an Accessory Dwelling Unit · How to Use a Bank Statement HELOC for an Accessory Dwelling Unit · How Much Can You Borrow on a Bank Statement HELOC for an Accessory Dwelling Unit?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Legal disclosures. Lendmire (NMLS# 2371349) is a state-licensed mortgage brokerage that arranges financing through wholesale lender relationships. Lendmire is not a direct lender, depository institution, or registered financial advisor. The discussion above is general informational content about real estate financing — it is not financial, legal, or tax advice, and readers should consult licensed professionals for guidance on their individual circumstances. Loan inquiries are subject to lender underwriting; this article does not represent a commitment to lend. Loan terms, rates, and qualification standards vary by borrower, property, and state, and are subject to change at any time. Equal Housing Opportunity. NMLS Consumer Access: nmlsconsumeraccess.org.