The Quick Read: Usually less than you would hope: on a fully rented duplex, the line equals the building’s value times 70% combined loan-to-value (CLTV, meaning all loans against the property added together as a share of its value), minus what you already owe, and never more than $500,000, subject to lender guidelines.
- The investment-property ceiling on Lendmire’s wholesale network is 70% CLTV. A credit score above the 700 minimum does not raise it.
- Lines run $25,000 to $500,000. If your equity room falls under the minimum, there is no line.
- The line is judged on your credit and debt-to-income ratio, not on what the duplex rents for.
- Live in one unit and the duplex is treated as owner-occupied. That changes the ceiling.
- An LLC cannot hold title on this product. Title sits in your name or a revocable living trust.
Key Terms Defined
You will see these words in every lender conversation. Here they are in plain English.
- HELOC (home equity line of credit): a revolving credit line secured by property you own. You borrow, repay, and borrow again within the limit.
- Draw period: the stretch when you can pull money from the line. On the investment line Lendmire places, it is five years with interest-only payments, followed by a 25-year repayment period.
- Second lien: a loan that sits behind your first mortgage. If the property is ever sold or foreclosed, the first lien gets paid first. The line can also sit in first position if there is no mortgage.
- DTI (debt-to-income ratio): your monthly debts divided by your monthly income. The network maximum is 50%.
- Automated valuation: a software estimate of the building’s value, used in place of a full appraisal.
- Vesting: how title to the property is held. Personal name, trust, or LLC.
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.
How Is the Limit Calculated?
The limit is value times the allowed CLTV, minus every lien already on the building. Then the dollar cap and your personal qualifying numbers can only push the result down, never up.
Run it in four steps:
1. Value. The lender estimates what the duplex is worth.
2. Allowed CLTV. On an investment property in Lendmire’s network, that is 70%.
3. Subtract existing liens. Your first mortgage, plus any other loan secured by the building.
4. Apply the cap and the borrower tests. The line cannot exceed $500,000. You must also clear the 700 credit minimum and the 50% DTI ceiling.
Whichever is smaller, the CLTV room or the dollar cap, controls. On a modest duplex, the CLTV room is almost always the binding number. On a pricey one, the $500,000 cap takes over.
Here is the part that trips people up. The lender is not measuring how much equity you have. It is measuring how much room is left under 70% after your first mortgage. A duplex you own outright still keeps 30% of its value untouched, because the investment ceiling stops at 70%.
Worked Examples (in Percentages)
These examples use percentages of value on purpose. The math is the same on any price, and the illustrative calculator on this page handles dollars.
| Scenario | First mortgage | Room under cap | Result |
|---|---|---|---|
| Investment duplex, all units rented | 40% of value | 30% of value | Line sized to that room, up to the cap |
| Investment duplex, all units rented | 60% of value | 10% of value | Small line; check the $25,000 minimum |
| Investment duplex, all units rented | 70% of value | None | No room under the ceiling |
| Owner-occupied duplex, 720+ credit | 60% of value | Up to 30% of value | Primary-residence tier; different terms |
The last row is a different product tier, not a bigger version of the first three. More on that below.
Notice what the middle row says. A first mortgage at 60% of value looks healthy, yet only 10% of value is left to borrow against. That is how many investors discover their “lots of equity” is thinner than they thought.
What if You Live in One Unit?
A duplex where you live in one side and rent the other is usually owner-occupied, and the ceiling is higher. A duplex where you rent both sides is an investment property, and the ceiling is 70% CLTV.
On Lendmire’s network, primary-residence and second-home lines can reach 90% CLTV, but only at a 720-or-better credit profile. Below that, the ceiling is lower. The 90% figure is a primary-residence figure. It never describes a fully rented duplex.
Occupancy is not permanent either. Move out later and the class changes, and so does the ceiling. Tell the lender the truth about where you sleep. It affects the whole file.
Why Do Fewer Lenders Offer This at All?
Because a rental carries more risk than a home you live in, and many banks simply skip it. NerdWallet says a rental HELOC is possible but comes with a smaller pool of lenders and a lower borrowing limit than a primary home. It also says lenders see higher default risk on rentals.
That same page sets out market-wide figures for rental lines. It lists a maximum of 80% LTV with many lenders below 70%, plus a credit score around 720. Those are market-wide statistics, not what you will find on Lendmire’s network. The network figure for an investment property is 70% CLTV with a 700 minimum credit score, and nothing sits above 70%.
A broker like Lendmire sees many lenders’ guidelines side by side. That matters here, because a local bank may only offer lines on homes you live in. A broker can place the file with a wholesale lender that does handle rentals.
What Qualifies, and What Doesn’t?
A fully rented two-to-four-unit building, held in your name or a revocable living trust, can qualify, subject to lender guidelines. Several property and ownership types are out.
Eligible:
- Duplexes, triplexes, and fourplexes
- Single-family homes, townhomes, and condos (including non-warrantable condos)
Not eligible on this product:
- Manufactured homes, co-ops, condotels, and log homes
- Mixed-use or commercial buildings
- Agricultural zoning
Title is the sharp edge. An LLC, corporation, or partnership cannot hold title. Neither can an irrevocable, blind, or land trust. If your duplex is already deeded to an LLC, you either change the vesting or look at a DSCR cash-out refinance instead. Lendmire’s piece on HELOC rules for LLC-titled borrowers walks through that choice.
Portfolio limits also apply. A borrower can hold up to three lines. A borrower with more than 15 financed properties is not eligible.
Where it’s offered. This HELOC is available in 16 full-service states, which is narrower than Lendmire’s DSCR footprint of 41 markets, including Washington, D.C.
Does Rent From the Second Unit Count?
Not for the cap, and not as the basis for approval. The line is qualified on your credit and your DTI. The duplex’s rent is not what’s being tested.
Rent can help your DTI, if the lender counts any of it. It does not move the 70% ceiling. Some lenders count only a portion of rental income, so don’t assume the full lease amount helps.
This is the biggest difference from a DSCR loan. DSCR (debt service coverage ratio) compares the property’s monthly rent to its monthly obligation. That monthly obligation is principal, interest, taxes, insurance, and any association dues. A DSCR loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. A HELOC tests you personally.
DTI on a HELOC is also calculated on the interest-only payment at the maximum draw. So a big limit can hurt your own DTI even if you never draw it all.
Why Does a Real Offer Come in Below the Math?
The formula gives a ceiling. Several things push the actual line lower.
- Value comes in low. For lines at or below $500,000, lenders ordinarily use an automated valuation instead of an appraisal. Every investment line is in that lane. If the software undervalues the building, the whole calculation shrinks. A recent rehab may not show up in the estimate. You can request a full appraisal. On a two-to-four-unit building, a full appraisal typically uses Form 1025, the Small Residential Income Property Appraisal Report, which Fannie Mae’s Selling Guide lists for those properties. That is only the form’s name. HELOC and DSCR products aren’t agency loans.
- Other liens count. A second loan or an old line against the duplex eats room.
- The dollar cap. $500,000 is the top of an investment line, no matter how much equity you have.
- The minimum. If the room left is under $25,000, there’s nothing to offer.
- Your own numbers. A score under 700 ends the conversation on an investment line. A DTI over 50% does too.
- The building is still in rehab. A line on a rental that is mid-renovation is usually unavailable.
Each unit does not qualify on its own. The building is one piece of collateral and gets one line.
HELOC or DSCR Cash-Out: Which Fits a Duplex?
A HELOC suits an investor with strong personal credit who wants to keep a low first mortgage. A DSCR cash-out refinance suits an investor whose rent covers the payment and who may hold title in an LLC, subject to lender program eligibility.
| Factor | Investment HELOC | DSCR cash-out refinance |
|---|---|---|
| What’s tested | Your credit and DTI | Property rent vs. payment |
| Max leverage | 70% CLTV | Around 75% LTV on standard rentals |
| First mortgage | Stays in place | Replaced |
| Payments | Interest-only draw, then repayment | Set at closing |
| Title | Personal name or revocable trust | LLC allowed, program-dependent |
| Credit floor | 700 | 620 in parts of the network; most want about 660 |
Two notes on that table. First, a DSCR cash-out refinance replaces your first mortgage, so if yours is cheap, giving it up has a real cost. Second, DSCR coverage of 1.00 is where select programs start, and stronger coverage opens better terms. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted. Clearing 1.00 doesn’t mean the duplex cash flows, because repairs, vacancy, management, and capital expenses sit outside the calculation.
A HELOC lender sets its own waiting rules. For the cash-out side in detail, see Lendmire’s complete DSCR loans guide.
Which wins? It’s close to a toss-up when your credit is strong and your first mortgage is cheap. The HELOC keeps the first loan. When the first mortgage is expensive, title is in an LLC, or your DTI is stretched, DSCR cash-out usually makes more sense.
What Are the Risks?
Four stand out: your payment can move, you now have two liens, the line can be frozen, and the money has to earn more than it costs.
- Pricing floats. On the investment line, pricing floats through both the draw and repayment periods and never converts to fixed. That matters for rental cash flow.
- At least 75% is drawn at closing. You can’t take a small slice and leave the rest idle. Plan for the interest on that draw from day one.
- Two liens. Falling behind on either can put the duplex at risk.
- The line can be restricted. The CFPB says a lender may limit further borrowing if the property’s value drops significantly. A line that is open today may not stay fully open.
- Repayment arrives. After the five-year draw, the balance amortizes over 25 years. The CFPB cites a 10-year draw as a common example elsewhere in the market, so check which structure you’re getting.
Checklist Before You Apply
1. Confirm every unit is rented, or which unit you occupy.
2. Pull your first-mortgage balance and any other liens.
3. Subtract that balance, as a share of value, from the lender’s combined loan-to-value limit.
4. Check the result against the lender’s minimum and maximum loan amounts.
5. Confirm title is in your name or a revocable living trust.
6. Check your credit and your DTI against the lender’s published limits.
7. Gather the first-mortgage statement, insurance declaration, and vesting deed. Leases and rent rolls may also be requested.
8. Ask whether the lender will order a full appraisal if the automated value looks low.
Frequently Asked Questions
Can you get a HELOC on a duplex you rent out?
Yes, on Lendmire’s network, if all units are rented and title is in your name or a revocable living trust. The ceiling is 70% CLTV, with a $25,000 minimum and $500,000 maximum line, and a 700 credit minimum. Approval is subject to lender guidelines and a full file review.
Is a duplex where I live in one unit treated differently?
Yes. A duplex with an owner in one unit is usually owner-occupied, and the primary-residence ceiling can reach 90% CLTV, but only at a 720-or-better credit profile. A fully rented duplex is capped at 70% CLTV. If you later move out, the class and the ceiling change.
Does a higher credit score raise how much I can borrow?
Not on an investment line. A 720 score and a 700 score both reach the same 70% CLTV ceiling, so credit above 700 buys eligibility, not extra leverage. Below 700, an investment line isn’t available.
Can my LLC take out a HELOC on the duplex?
No. An LLC cannot hold title on this product. You can retitle the property into your name or a revocable living trust, or look at a DSCR cash-out refinance instead, subject to lender program eligibility.
How does a HELOC compare with a DSCR cash-out on a duplex?
A HELOC tests you personally and leaves your first mortgage alone. A DSCR cash-out tests the property’s rent against its payment and replaces the first loan, with leverage that tops out around 75% LTV on standard rentals. Final terms depend on lender guidelines, property type, leverage, and the borrower’s complete credit picture.
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. Lendmire is a mortgage broker, so every figure here is subject to lender guidelines and full file review. This article is not a commitment to lend.
The real limit on a duplex is rarely your equity. It is the 70% line, drawn through your first mortgage balance.
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. NerdWallet
3. CFPB
This article is part of Lendmire’s investment property HELOC program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Can You Get an Investment Property HELOC When Speed and Convenience Matter Most? · Can You Get an Investment Property HELOC With No Limit? · Can You Get an Investment Property HELOC With One Unit Vacant?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
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- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
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.