The Quick Read: A home equity line works well for an ADU on a paid-off home because the line becomes the only lien. The line is sized on today’s value, not on what the finished ADU will be worth. At least 75% of the line is drawn at closing, with later draws available afterward, and the draw period pays interest only before principal payments begin.
- Sizing: the line is based on current appraised value and a combined loan-to-value cap, and the ADU does not add to it.
- Occupancy matters: on an investment property, the network ceiling is 70% CLTV with a 700 minimum credit profile and a $500,000 maximum line. Primary residences and second homes follow different tables.
- Ownership matters: the borrower or a revocable living trust must hold title. An LLC cannot.
- Rent is not counted: a HELOC is underwritten on the borrower’s profile, not the ADU’s future income.
- The exit matters: many investors plan a DSCR refinance once the ADU is leased.
An ADU is a second dwelling on the same lot, such as a garage conversion, a backyard cottage, or a basement unit. Owners with no mortgage hold the most flexible position for funding one. There is no first lien to work around, and the full appraised value is the equity base. That flexibility brings its own risks, covered below. All figures here are guidelines from select lenders in Lendmire’s wholesale network, subject to lender guidelines and full file review. They are not a commitment to lend.
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.
What Changes When Your Home Is Paid Off?
A paid-off home changes the lien position, the equity math, and the risk. The HELOC becomes the first and only lien, and the line is sized from the whole appraised value rather than value minus a mortgage balance. Most online guides assume a borrower with an existing mortgage who wants to keep a low first-mortgage payment. That argument disappears when there is no mortgage to protect.
Think of it as three shifts.
First, the equity formula simplifies. A lender takes the appraised value, applies its maximum combined loan-to-value, and subtracts existing liens. With no liens, the cap applies to the whole value.
Second, the choice between a HELOC and a cash-out refinance changes. A HELOC leaves a first mortgage and its rate alone, while a cash-out refinance replaces it. With no first mortgage, you are weighing two new debts against each other, not protecting an old one.
Third, you are placing a lien on a home that currently has none. That is a real decision. Across the wholesale network, the strongest files treat that lien as part of a planned exit, with a payoff or refinance path set before the first draw.
How Does Underwriting Treat an ADU Build Funded by a HELOC?
Underwriting treats a HELOC as a loan against the property as it exists today. The ADU does not raise the line, and projected rent from the new unit generally does not count as qualifying income. Approval rests on the property’s value, the borrower’s credit, and the borrower’s debt-to-income ratio. The California Assembly’s ADU financing backgrounder, which summarizes Urban Institute research, notes that no major government or GSE mortgage product counts both after-repair value and potential rental income. It also says the size of a home equity line is limited by home value, and that eligibility rules such as credit score can restrict access.
Here is how a file typically moves, step by step.
1. Value today. Lines at or below $500,000 ordinarily run an automated valuation with no traditional appraisal, though a higher CLTV may call for a second valuation. A full appraisal is required above $500,000, and any borrower may request one.
2. Apply the CLTV cap. The cap depends on occupancy and credit tier. More on that in the next section.
3. Check credit and DTI. The program floor is a 600 credit profile, scored on a single-bureau model tied to the primary wage earner. DTI tops out at 50%, drops to 45% for credit profiles from 600 to 679, and is calculated on the interest-only payment at the maximum draw.
4. Confirm title and property type. Single-family, 2-4 units, PUDs, townhomes and condos, including non-warrantable condos, are eligible. Manufactured homes, co-ops, condotels, log homes, commercial, mixed-use and agricultural zoning are not.
5. Close and fund. At least 75% of the line is drawn at closing. That detail shapes an ADU plan, so it gets its own section below.
One more point: a few specialty renovation products elsewhere in the market lend against after-build value. Those are a different product category. A standard line, which is what this network places, does not.
How Much Can You Draw on a Paid-Off Home?
The line size comes from occupancy, credit tier, and appraised value, and it ranges from $25,000 to $750,000 (Michigan’s floor is $10,000). The ceiling differs sharply depending on whether the home is a primary residence, a second home, or an investment property. Quote only the ceiling for the occupancy actually in play.
| Occupancy | Top CLTV | Credit needed | Max line |
|---|---|---|---|
| Primary residence | 90% | 720+ | $500,000 at that tier |
| Primary residence | 75% | 700+ or 720+ | Up to $750,000 |
| Second home | 90% | 720+ | $500,000 |
| Investment property | 70% | 700+ | $500,000 |
A few notes on the table. The 90% figure exists only at a 720-or-better credit profile, and it applies only to primary residences and second homes. Lower credit tiers step down: on a primary residence, a 680 profile reaches 85% CLTV and a 640 profile reaches 80% CLTV, both on lines up to $500,000. Second homes floor at a 640 credit profile.
On an investment property, the ceiling is 70% CLTV, no exceptions. A line above $500,000 is primary-residence only, needs a 700 credit profile or better (720 on the longer-runway structure described below), caps at 75% CLTV, and requires a full appraisal.
Picture an owner with a paid-off rental duplex who wants to add a backyard unit. On the investment-property table, the line tops out at 70% of appraised value and never above $500,000, with a 700 minimum credit profile. Now picture the same owner building on a primary residence with a 720 profile: the ceiling can reach 90% CLTV on a line up to $500,000. Same project, very different capacity.
Texas primary residences are homestead properties and cap at 80% combined loan-to-value. Texas also has a waiting period, a one-lien-at-a-time rule, and 12-month seasoning on primary residences only. Texas second homes and investment properties are eligible as non-homestead transactions.
A larger line does not change the project’s economics. The ADU’s cost still has to fit inside the line with room for overruns.
What Do the Draw Period and Repayment Look Like?
Every line has a draw period with interest-only payments, then a repayment period that includes principal. The CFPB’s HELOC brochure describes this two-phase structure. It also warns that payments on a variable-rate plan can change even if you draw no more money, and that some plans end with a balloon payment.
Lendmire’s wholesale network offers two draw structures on primary residences and second homes:
- Three-year draw: a 3-year interest-only draw with a 17-year fully amortizing repayment.
- Five-year draw: a 5-year interest-only draw with a 25-year fully amortizing repayment. This is the longer-runway structure.
Tennessee shortens both, to 3 and 12 years and to 5 and 10 years. Investment lines run the five-year draw and 25-year repayment structure only. Pricing floats across both the draw and the repayment period and never converts to a fixed amount.
Two mechanics matter specifically for ADU builds.
The 75% closing draw. This differs from a line you draw only as each phase is billed. At least 75% of the line is drawn at closing, and only the remainder is available for later draws. If a build needs staged funding over many months, size the line so the closing draw is money you can use or hold. Interest accrues on what is drawn, so a large day-one draw carries interest before the contractor bills it. After closing, the minimum subsequent draw is $1,000 (Texas is $4,000) on the longer-runway structure.
Payment shock. Interest-only does not mean the debt shrinks. The CFPB brochure says the draw-period payment may cover no principal at all. When the draw ends, principal repayment begins on the full balance. Investors should plan the exit, whether payoff from rent, a sale, or a refinance, well before that date.
When Does This Plan Break?
The general rule is that a HELOC funds an ADU cleanly on a paid-off home. It breaks in these named cases.
LLC-owned property. Title must be held by the individual borrower or an inter vivos revocable living trust. LLCs, corporations, partnerships, and irrevocable, blind, or land trusts cannot hold title. A rental already deeded to an LLC needs a vesting change before a HELOC, or a DSCR cash-out refinance instead. That is the sharpest structural difference between a HELOC and a DSCR loan.
Ineligible property types. Manufactured homes, co-ops, condotels, log homes, commercial, mixed-use, and agricultural zoning are not eligible. Modular factory-built homes are eligible on the longer-runway structure only.
Thin current equity. If today’s value cannot support the cost of the build at the applicable CLTV, a construction or renovation loan sized on after-completed value is the usual alternative. That is a different product from this one.
Credit history. A bankruptcy needs 4 years of seasoning from discharge or dismissal. On primary residences and second homes, foreclosure history splits: one structure seasons a foreclosure in 7 years and a deed-in-lieu, pre-foreclosure, or short sale in 4, while the other declines that history entirely. Investment files follow the 7-and-4-year path.
Portfolio limits. A borrower is limited to three lines. Combined exposure caps at $2,000,000 on the higher-leverage structure and $750,000 on the longer-runway one. A borrower with more than 15 financed properties is not eligible.
Listed properties. A home listed for sale, or listed within the past 60 days, is ineligible in NC, PA, TN, TX, and WA.
Availability. HELOC placement is limited to Lendmire’s 16 full-service states: AL, CA, CO, FL, GA, IN, MI, MT, NM, NC, OH, PA, TN, TX, VA, and WA. That is narrower than the 41-market DSCR footprint.
Utility and permit delays. Interest runs while the ADU waits for power, inspections, or a certificate of occupancy, and rent cannot start until the unit is connected. Build a carrying-cost cushion into the plan.
What Does the Appraisal Gap Do to Your Exit?
The finished ADU may not appraise for what it cost. An improvement may support a higher appraised value, depending on comps and underwriter review, but a dollar-for-dollar lift is never a safe assumption. Investor discussions of ADU exits often describe a build that cost far more than the value it added to the appraisal, leaving money trapped in the property.
That matters because a cash-out refinance take-out is sized on appraised value. If the ADU appraises light, the refinance may not retire the whole HELOC balance. Plan the payoff with room to spare, and plan to cover any shortfall from cash or rent.
Experienced operators across the network see the same pattern. Files that clear cleanly are those where the owner modeled the exit on today’s value plus a cautious ADU contribution, not on the contractor’s cost.
Where Does a DSCR Loan Fit After the Build?
A DSCR loan is the natural take-out once the ADU is leased, because it qualifies primarily on property-level rental income covering the payment, subject to lender guidelines. Lendmire’s complete DSCR loans guide covers the full program in detail. The usual sequence is simple: draw on the HELOC for design and construction, lease the unit, then refinance the whole property into a long-term DSCR loan.
On a standard rental, cash-out refinance tops out around 75% LTV across most of the network, with about 6 months of seasoning as the common expectation. Short-term rental collateral steps down to 70% on cash-out. DSCR files typically want a credit profile around 660, with a 620 floor in parts of the network and 700-plus unlocking the strongest leverage tiers. Reserves vary by lender, leverage, and loan size, commonly around 6 months of PITIA.
Coverage of 1.00 is where many select programs start. A separate select-lender path takes coverage below 1.00 with leverage and terms adjusted. Clearing 1.00 is not the same as positive cash flow: repairs, vacancy, management, and utilities sit outside the calculation.
Tax treatment can depend on how the funds are used and how the property is held; investors should keep clear records and speak with a qualified tax professional before relying on any deduction.
HELOC Versus the Other Options
| Option | Funds | Best fit |
|---|---|---|
| HELOC | 75%+ at closing, rest drawn later | Builds with a clear exit plan |
| Cash-out refinance | Lump sum | Larger builds on rentals |
| Construction loan | Staged to completion | Thin current equity |
| Cash or hybrid | Mixed | Early soft costs |
On a paid-off home, a HELOC and a cash-out refinance are the two main equity routes. The HELOC keeps the structure lighter. The refinance gives a single lump sum on a rental. Cash-out on a standard rental is the better route when the project is large and the investor wants a long-term structure from the start.
Key Terms Defined
Draw period: the stretch of years when you can borrow from the line and pay interest only.
Repayment period: the later stretch when principal and interest are both due and no new draws are available.
Combined loan-to-value (CLTV): all liens on the property added together, divided by its appraised value.
Lien: a lender’s legal claim on the property until the debt is paid.
Soft costs: design, permits, impact fees, and similar items paid before construction starts.
Is This the Right Path?
A HELOC fits when the owner holds title personally or in a revocable trust, the property type is eligible, the build fits inside today’s equity at the applicable cap, and there is a clear exit before the draw period ends. It fits poorly when the property sits in an LLC, current equity is thin, or the plan depends on projected ADU rent to qualify.
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 through the Lendmire quote page.
Frequently Asked Questions
Can a HELOC cover design, permits, and site work, or only construction?
Yes, the money is not restricted to construction. Soft costs such as design, permits, and impact fees can be paid from the line. Because at least 75% of the line is drawn at closing, budget interest on those funds from day one.
Will the ADU’s projected rent help me qualify?
Generally no. Standard HELOC underwriting looks at the borrower’s credit, DTI, and the property’s current value. Rent from a unit that does not exist yet is not part of that review.
Can I use a HELOC if my rental is held in an LLC?
Not as the title stands. The borrower or a revocable living trust must hold title, so a property in an LLC needs a vesting change first, or a DSCR cash-out refinance instead. Whether a vesting change makes sense depends on your legal and tax situation.
What if the build costs more than the line allows?
Overruns come out of cash, a second funding source, or a scaled-back scope. A line is capped by value, CLTV, and the program maximum, so build a contingency into the budget before closing. A larger line does not change leverage caps or credit floors.
Is an interest-only draw period a risk?
It can be. Interest-only payments keep carrying costs low during the build, but the balance does not shrink. When repayment starts, principal is due on the full amount, so the exit plan should be set before the draw period ends.
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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References
1. California Assembly ADU Financing Hearing Backgrounder (citing Urban Institute)
2. CFPB – What you should know about HELOCs (brochure)
This article is part of Lendmire’s home equity line of credit program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Can You Finance a Property With an ADU Using a DSCR Loan? · How Much HELOC Budget a Paid-Off Home Unlocks for an ADU · Is a HELOC a Smart Way to Fund an ADU on a Paid-Off Home?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Disclosure information. Lendmire is a state-licensed mortgage brokerage under NMLS# 2371349. Lendmire is not a depository institution, direct lender, or financial advisor — all loans referenced are placed through wholesale lender partners and are subject to each lender's underwriting standards. This article is provided for general informational purposes and is not a commitment to lend, nor does it constitute financial, legal, or tax advice. Loan programs, terms, rates, and qualification standards change without notice and depend on borrower profile, property type, and the state in which the subject property is located. Equal Housing Opportunity provider. NMLS Consumer Access: nmlsconsumeraccess.org.