How an Investment Property HELOC Works With One Unit Vacant

The Quick Read: On most investment lines, one empty unit does not block approval, because the lender tests your credit, your income, and your equity rather than the building’s rent. The vacancy matters for a different reason: the payment keeps running whether or not the unit is leased.

• The line is tested on you (credit, debt load, combined leverage), not on the property’s rent.
• On an investment property, the network ceiling is 70% combined loan-to-value (CLTV), with a 700 minimum credit score and a $500,000 maximum line.
• Title has to sit with you personally or in a revocable living trust. An LLC cannot hold it.
• Rent-based loans, such as a DSCR cash-out, treat the empty unit very differently, and many cap how many units can be vacant.
• Interest starts on the drawn balance right away, so plan the carry before you borrow.

What an Investment Property HELOC Actually Is

A home equity line of credit (HELOC) is a revolving credit line secured by real estate. You borrow, repay, and borrow again within a limit. On an investment property, the collateral is a rental building you own, not the home you live in.

Lines come in two phases. During the draw period you can borrow, and payments are typically interest-only on what you owe, as Experian explains. After that comes the repayment period, when you stop borrowing and the balance pays down.

Across the select wholesale lenders Lendmire works with, the investment version has a fixed shape. It is a standalone line in first or second lien position. It runs a 5-year draw followed by a 25-year fully amortizing repayment. At least 75% of the line is drawn at closing. Pricing floats through both phases and never converts to a fixed structure. Every figure here is subject to lender guidelines and full file review.

The program does not look at units one by one. A duplex, triplex, or fourplex is one piece of collateral with one line against it. That is why a single empty unit does not get its own test on a personal-income line.

How Underwriting Treats the Vacant Unit, Step by Step

On a personal-income line, the vacant unit rarely matters at any gate before approval. Its weight falls after closing, when you carry the payment. Here is the sequence a file moves through.

Step 1: Eligibility gates. Before anyone reads a rent figure, the file has to pass title, property type, and credit. Title must be held by you or your revocable living trust. Eligible properties include single-family homes, 2-4 unit buildings, townhomes, PUDs, and condos. Manufactured homes, log homes, co-ops, condotels, and mixed-use or commercial properties are not offered.

Step 2: Credit. An investment line needs a 700 minimum score. A 720 and a 700 both reach the same 70% CLTV ceiling, so a higher score buys eligibility, not extra leverage. The credit report cannot be more than 90 days old at closing.

Step 3: Value and combined leverage. CLTV is every lien on the building added together and divided by its value. The maximum line equals value times 70%, minus what you already owe. Picture a building where the first mortgage already equals 55% of value. That leaves room for a line worth about 15% of value. The lender counts the full line limit, not just what you plan to draw.

Lines of $500,000 or less ordinarily use an automated valuation instead of a traditional appraisal. An investment line cannot exceed $500,000, so most investment files fall in that lane. An empty unit does not change that value mechanically. A building in rough condition can still draw a second look, and you may request a full appraisal in any case.

Step 4: Income and debt-to-income (DTI). Maximum DTI is 50%, and it drops to 45% for credit profiles from 600 to 679. The lender reviews your file on the interest-only payment calculated on the maximum draw, even if you plan to draw less. Documentation typically includes tax returns, or business bank statements on a bank-statement variant. Rent from the empty unit counts for little or nothing here. On a file that reads tax returns, an empty unit can show up as expenses with no matching rent, which lowers the net income the lender sees.

Step 5: Exposure limits. A borrower is limited to three lines. Combined exposure caps at $2,000,000 on the higher-leverage program and $750,000 on the longer-runway one. Owning more than 15 financed properties makes you ineligible.

Step 6: Closing and the first draw. At closing, at least 75% of the line is drawn. Once the line is live, any later draw must meet the minimum subsequent draw, typically $1,000. Interest is accruing, and the empty unit is now yours to carry.

Key Terms Defined

CLTV (combined loan-to-value): All loans secured by the property, divided by its value.

Draw period: The window when you can borrow from the line, usually with interest-only payments.

Repayment period: The phase after the draw ends, when you can no longer borrow and the balance pays down.

DSCR (debt service coverage ratio): Monthly rent divided by the full monthly payment on a loan, meaning principal, interest, taxes, insurance, and any association dues (PITIA).

Vesting: The legal name that holds title to the property, such as you personally, a revocable trust, or an LLC.

Rent roll: A unit-by-unit list of tenants, rents, and lease dates.

Personal-Income Line vs. Rent-Based Loan

The same empty unit gets two different answers depending on what the product tests. That difference is the key to this topic.

DSCR loans qualify primarily on property-level rental income covering the payment, subject to lender guidelines. Because they are business-purpose investor loans, they are reviewed differently from a standard owner-occupied mortgage.

Lendmire’s complete DSCR loans guide walks through that rent-based path in full. For this topic, the point is simple. On a HELOC, the empty unit hurts your cash flow. On a rent-based loan, it hurts your coverage figure.

What One Empty Unit Does to a Duplex, a Triplex, and a Fourplex

The same single vacancy removes a very different share of the building’s income depending on how many units it has. These shares are illustrative arithmetic, not market data.

A duplex with one empty side is running on half its income. A fourplex with one empty unit has more cushion. This does not change whether a personal-income line approves you. It changes how long you can carry the payment.

On a rent-based loan, the math bites harder. Say a duplex clears roughly 1.2x with both units rented. Take one unit’s rent out and the ratio lands near 0.6x, well below the 1.00 where many select programs start. A fourplex with the same starting coverage and one empty unit would land around 0.9x. Those are modeled assumptions, not quotes. Coverage below 1.00 is available through select lenders in the network, with leverage and terms adjusted, but it is a separate path from the standard 1.00-and-up programs.

One more caution. Clearing 1.00 is not the same as positive cash flow. DSCR compares rent to the payment only. Repairs, vacancy, management, utilities, and capital expenses all sit outside the ratio.

Carrying the Payment While the Unit Is Empty

The payment does not pause when the unit is empty. The Consumer Financial Protection Bureau describes a HELOC as an open-end line with a draw period followed by a repayment period. It notes that payments are often significantly higher in repayment, and in some plans the whole balance can come due when repayment begins. That payment jump is the part of the structure investors forget when they plan around a vacancy.

On the investment line described above, the 5-year draw ends and the 25-year repayment begins. A vacancy that overlaps that changeover is the riskiest timing.

Plan the carry before you apply, not after. Commercial real estate underwriters use two numbers. The first is in-place vacancy, which equals market rent times the number of empty units. The second is a general vacancy-and-credit-loss factor applied even to a fully leased building. Adventures in CRE describes a 5% general factor as common in commercial underwriting. That figure is a commercial benchmark, not a mortgage program rule, but the habit is worth borrowing.

A practical carry checklist:

• Count the payment on the full line, since at least 75% is drawn at closing.
• Hold enough cash to cover the payment for the months it will realistically take to re-lease the unit.
• Budget turnover work separately from the payment.
• Avoid drawing extra to cover an expected vacancy unless the cash flow supports it.
• Test the repayment-phase payment, not just the interest-only one.

Where the General Rule Breaks

The rule that one empty unit does not matter has real exceptions.

Two or more empty units. On a rent-based loan, this usually exceeds the vacancy limit. Many rent-based programs allow at most one empty unit in a 2-4 unit building, with leases on the rest. On a personal-income line, there is no formal vacancy test, but your payment risk climbs fast.

Vacant because of renovation. A rent-ready unit between tenants is a different situation from a unit under construction. When a unit is mid-renovation, condition becomes the first question, and the valuation may reflect it. Finish the work, then apply.

Unit listed for sale. Listing a vacant unit for sale can complicate how the lender treats occupancy. Several states also make a property listed for sale, or listed within the past 60 days, ineligible for the line.

You live in one unit. An investment line is for non-owner-occupied rentals. If you live in a duplex, it is a primary residence, and a different table applies. That table can reach up to 90% CLTV, but only at a 720-or-better credit profile. The investment ceiling stays at 70%.

LLC title. For many investors this is a bigger obstacle than the vacancy. An LLC, corporation, partnership, or irrevocable or land trust cannot hold title on this line. A property already deeded to an LLC needs a vesting change, or a DSCR cash-out instead.

Larger buildings. A building with five or more units is commercial multifamily with its own appraisal method. It sits outside this topic.

Bigger line sizes. An investment line cannot exceed $500,000. A line above that is for a primary residence only, and requires a full appraisal.

Which Path Fits Your Situation?

Pick the product by what your file does well, not by what you saw advertised.

On a standard rental, DSCR cash-out refinances top out around 75% LTV across most of the network, and about six months of seasoning is the common expectation. 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. A cash-out takes a bigger bite out of the vacancy question, because rent drives the approval. Lendmire’s piece on comparing an investment HELOC with a DSCR cash-out on a duplex with one unit vacant covers that choice head to head. Terms vary by lender guidelines, property type, leverage, credit profile, and full file review.

The tradeoff is between borrowing now and waiting to re-lease. Waiting costs time carrying the property without the extra equity. Borrowing now gets you capital sooner, but you carry a payment against an unleased unit. Neither answer is right for everyone.

What to Gather for a Partly Vacant Building

A partly vacant building goes smoother when the paperwork explains the vacancy.

• A current rent roll showing leases, rents, and expiration dates on the occupied units.
• A listing history or marketing record for the empty unit, showing it is rent-ready and offered.
• The latest first-mortgage statement and any other lien statements.
• Title or vesting documents showing you or your revocable trust as the owner.
• Income documents for the program, such as tax returns or business bank statements.
• A credit report that will still be under 90 days old at closing.

Next Steps

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 mortgage broker that arranges financing through select wholesale lenders. It does not lend directly. The investment HELOC discussed here is offered in 16 states, which is narrower than the broker’s DSCR footprint of 41 markets, including Washington, D.C. Reach the team at 828-256-2183 or through the quote request page. Any calculator on this page gives an illustrative estimate only, and nothing here is a commitment to lend.

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.

References

1. Experian – Draw period on a HELOC

2. Consumer Financial Protection Bureau

3. Adventures in CRE – Vacancy and Credit Loss in Real Estate Underwriting