The Quick Read: A fifth unit usually moves the building out of the residential one-to-four unit lane and into a five-plus unit lane, where lenders size the loan on net operating income instead of gross rent, so the amount can land lower or higher than the fourplex loan.
- At four units, the test is monthly rent against the full payment (principal, interest, taxes, insurance and any association dues).
- At five units, the test usually becomes net operating income against debt service, after operating expenses come out.
- The loan amount is the lower of two ceilings: a leverage cap against value and a coverage cap against income. The fifth unit can change which one binds.
- Fewer lenders play at five units, and terms are often shorter and set file by file.
What Changes at the Fifth Unit?
The classification changes. Four units and under sit in the residential world, and five and over sit in commercial multifamily. That line is a lending convention, not a physical fact. The same brick building gets a different underwriting treatment the day a fifth door becomes legal.
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Rentana’s multifamily financing explainer calls five units the most significant dividing line in multifamily finance. At that point the lenders, the underwriting criteria and the loan structures all shift together.
For a DSCR borrower, that shift matters more than almost anywhere else on the unit-count ladder. Across the wholesale network Lendmire places files with, the standard DSCR programs are built around one-to-four unit rentals. Past four units, the pool of lenders narrows. Some programs reach into the five-to-ten unit range, but availability is thin and terms are set file by file.
This article walks through how the loan amount gets built at four units, how it gets built at five, and where the answer can move in either direction. For the broader picture of how these loans work, see Lendmire’s complete DSCR loans guide.
Key Terms Defined
DSCR (debt service coverage ratio): A measure of whether the property’s rent covers its debt payment. A ratio of 1.00 means income equals the payment with nothing to spare.
PITIA: Principal, interest, taxes, insurance and association dues. It is the full monthly obligation on the property.
NOI (net operating income): Rent and other property income minus the costs of operating the building, such as taxes, insurance, maintenance, management and vacancy.
LTV (loan-to-value): The loan amount as a percentage of the property’s value.
Legal unit: A unit that is permitted, documented and counted as a separate dwelling by the local jurisdiction, the appraiser and the lender.
Seasoning: The waiting period or track record a lender wants before it counts an event, such as ownership time or rent history.
How the Four-Unit Loan Is Sized
At four units and under, the math is simple. The lender compares the property’s monthly rent to PITIA. Clearing 1.00 means the rent covers the payment. Many select programs start at 1.00, and stronger ratios open better pricing and more leverage. A separate select-lender path takes coverage below 1.00 with leverage and terms adjusted.
Leverage comes next. On a purchase, most files land at 75% to 80% LTV, and select high-leverage programs reach 85% with roughly a 700 credit score or better. On a cash-out refinance of a standard rental, the ceiling is about 75% LTV, and about six months of seasoning is the common expectation. Credit floors start at 620 in parts of the network. Most programs want around 660, and 700 or better unlocks the strongest tiers. Reserves commonly run about six months of PITIA, stepping up to about nine months on loans above $1,500,000. Standard programs go up to $3,000,000. All of this is typical guidance, subject to lender guidelines, and varies by borrower, property and loan scenario.
The lender then takes the lower of the two ceilings. One is the LTV cap against the appraised value. The other is the largest loan whose payment the rent can carry at the required coverage. On a fourplex with solid rents, the leverage cap often binds first. In a pricey area with modest rents, the coverage cap binds first.
How Much Does a DSCR Loan Lend When a Fourplex Grows to Five Units?
It depends on the building’s expenses, its appraised value and the lender’s rules for that tier. The loan can shrink or grow. Three things move at once.
The numerator changes. At four units, the numerator is gross rent. At five, lenders usually start from rent and other property income, then subtract operating costs. Vacancy, management, repairs, taxes and insurance all come out before the lender looks at coverage. The same rent supports less debt under the net test than under the gross test.
The denominator changes. On a five-plus unit loan, debt service is typically principal and interest only. Taxes and insurance are not added again, because they were already deducted inside net operating income. So the two tests are not comparable. A 1.20x reading on the gross-rent test and a 1.20x reading on the net test describe different cushions.
The value changes. A fourplex is usually valued on residential comparable sales. A five-unit building is more often valued with the income approach, which rests on net income and a market capitalization rate. A building with strong rents and lean expenses can appraise well. A building with heavy expenses can appraise lower than the residential comps would have suggested.
Here is why the amount can go up. The fifth unit adds rent, and a larger, better-valued building can support a larger absolute loan. Here is why it can go down. The net test takes a bigger bite out of that rent, and the five-plus lanes often ask for a bigger coverage cushion. Neither direction is automatic.
One Building, Two Lanes
Run the numbers this way. These are modeled assumptions for illustration, not market data and not a quote.
Picture a fourplex where the rent clears the full payment at roughly 1.25x on the gross-rent test. That is comfortable at the four-unit level. Now the owner converts a basement into a fifth legal unit and leases it. Total rent rises, so the gross-rent reading looks even better.
Re-measure the same building the way a five-plus unit lender would. Take the rent, subtract vacancy, management, repairs, taxes and insurance, and compare what is left to principal and interest only. In a building with ordinary expenses, that net reading can land closer to 1.1x than 1.25x, even with the extra unit. A lender asking for more cushion at that tier may then cap the loan below what the gross-rent test implied.
| Step | Four units | Five units |
|---|---|---|
| Income measured | Gross rent | Net operating income |
| Payment measured | Full PITIA | Principal and interest |
| Value method | Residential comps | Income approach |
| Likely binding ceiling | Often leverage | Often coverage |
Flip the assumptions and the answer flips. A five-unit building with low expenses, high-quality tenants and a strong rent roll can show a net reading well above the lender’s floor. Then the leverage cap binds, and the larger value supports a larger loan. That is the reason investors should run both calculations before deciding between a fourplex and a five-unit.
Lendmire’s brokers see this pattern often. When an owner adds a unit, the file’s biggest surprise usually is not the rent. It is the expense line. Pulling trailing operating expenses together before talking to a lender gives a much more reliable read than starting from the gross rent.
Appraisal and Documents
Appraisal is where the lane change gets visible. For one-to-four unit rentals, appraisers use the small residential income property form. Fannie Mae’s Form 1025 is designed for two- to four-unit properties. At five units that form is no longer the right tool, and the appraisal is typically a commercial narrative report that leans on the income approach. Commercial reports cost more, and some lenders also ask for environmental or engineering reviews at this tier.
Documents follow the same pattern. At four units, a lender typically wants leases or a rent schedule, entity documents and credit. At five units, expect a rent roll, trailing operating statements, current leases and, often, more third-party reports. Many lenders at this tier also weigh the borrower’s experience with multifamily and the building’s financials ahead of the credit score. A five-unit file with no operating history can stall on documents alone.
Adding the Fifth Unit: Legality and Sequence
The unit count that counts is the legal one. A basement apartment, garage conversion or attic unit counts only when it is permitted, has its own kitchen and entry as the jurisdiction requires, and holds a certificate of occupancy. An informal unit may not count with the appraiser or the lender, and an unpermitted unit can sink the file.
The sequence usually looks like this:
1. Confirm zoning and permit eligibility for a fifth unit.
2. Build the unit under permit and pass final inspection.
3. Obtain the certificate of occupancy.
4. Lease the unit and collect rent.
5. Build a rent history the lender can document.
6. Order the appraisal under the five-plus unit method.
Lenders vary on how much rent history they want before they count the new unit. Some will use a signed lease. Others want actual rent collected. Ask before you build, not after. Tax treatment can depend on how the funds are used and how the property is held, so keep clear records and speak with a qualified tax professional before relying on any deduction.
DSCR vs. conventional financing
There are two common ways to finance an investment property, and they qualify you differently — here’s how investors weigh them.
Why investors choose it
- Qualifies on the property’s rental income — no personal tax returns, W-2s, or pay stubs needed to document income.
- No personal debt-to-income ceiling to clear, so existing mortgages and obligations don’t cap your borrowing the same way.
- Can be closed in an LLC, keeping the property inside a business entity.
- Built for scaling — not held to the limit on number of financed properties that conventional financing applies.
- Underwriting centers on the deal: generally qualifies when the rent covers the payment, a 1.00x coverage ratio being a common baseline (confirmed in underwriting).
- Designed specifically for investment property, including long-term and, where the program allows, short-term rentals.
Where it’s strong
- Often the lowest ongoing financing cost for a buyer who fully qualifies on personal income — a fit for a first property or a cost-first purchase.
Trade-offs for investors
- Requires full personal income documentation and must fit within a debt-to-income limit — salary, existing debts, and other mortgages all count.
- Typically held in your personal name rather than a business entity.
- Caps how many financed properties you can carry, which can become a ceiling as a portfolio grows.
- Evaluates you as a borrower as much as the property, which usually means more paperwork.
How investors usually choose: a first or single property often optimizes for the lowest financing cost; portfolio builders often optimize for leverage, vesting in an LLC, and scaling past conventional caps. The right answer depends on your goals, the property, and current guidelines — both paths run through select lenders in Lendmire’s wholesale network, with eligibility and terms confirmed in underwriting.
Refinance Timing: Before or After the Fifth Unit?
The loan you hold now matters. A refinance or cash-out on a building that has grown to five units is judged in the five-plus lane, even if you owned it as a fourplex. That cuts both ways.
Refinancing at four units, before the conversion, keeps you in the residential lane and may offer more leverage and more lender choice. On a standard rental cash-out, the ceiling is about 75% LTV, with about six months of seasoning commonly expected. The catch is that the fifth unit then arrives after the loan is placed. Check the existing loan for prepayment penalties and any restrictions on altering the property.
Refinancing after the conversion puts the stabilized five-unit income to work, which can support a larger value. But it moves you into the narrower lender pool and the net-income test. If an existing term loan is about to mature, Lendmire’s piece How Much a DSCR Term Loan Lends When a Blanket Loan Matures covers the timing questions that apply.
This one is a genuine toss-up. Staying residential offers cleaner terms. Moving up offers a bigger building. The right call turns on how much rent the fifth unit adds against the cost of losing the residential lane.
Your Lane Options at Five Units
| Path | What it looks like | Tradeoff |
|---|---|---|
| Stay at four units | Residential DSCR, gross-rent test | Fewer doors, widest lender pool |
| Specialized DSCR lane | Select lenders reach into five-plus units | Narrow availability, file-by-file terms |
| Bank commercial loan | Net income test, borrower review | Shorter term, possible balloon, more documents |
Commercial loans at this tier often carry shorter terms with longer amortization. Many include balloon payments and prepayment penalties. A balloon means a large balance is due at the end of the term, which creates refinance risk when that day arrives. Investors weighing a bank loan should price in the exposure to value and market conditions at maturity.
A specialized DSCR lane for five-plus units exists through select lenders. It is not the same as the one-to-four unit program. Leverage, reserves, credit expectations and coverage floors are set by the individual lender for that tier, and they can differ from the figures above, so confirm them before you plan around them. Mixed-use buildings, where part of the space is commercial, generally go to commercial underwriting, and the appraiser treats the commercial portion separately. DSCR programs are for investor-occupied rentals. An owner who lives in one unit of a two-to-four unit building can use owner-occupied financing, but those options generally end at five units.
Where the General Rule Breaks
The amount can rise. The common belief is that a fifth unit means a smaller loan. A strong rent roll with low expenses can support a larger loan, because the building is larger and valued on its income.
The “requires commercial” answer is too flat. Some lenders do offer DSCR-style financing at five units and above. The pool is narrow, and the structure differs from the one-to-four unit loan. Many retail products simply stop at four.
Clearing 1.00 is not cash flow. DSCR compares rent to the payment only. Repairs, vacancy, management, utilities and capital expenses sit outside the one-to-four unit calculation. A building can clear the ratio and still lose money in a bad year.
An unpermitted unit does not count. Lenders and appraisers count legal units. A fifth unit without permits and an occupancy certificate may be treated as a four-unit building with a problem.
Ineligible property types stay ineligible. Manufactured homes (single- and double-wide), log homes and barndominiums are not offered in the network’s DSCR programs. A conversion project built on one of those structures does not change that.
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. Federal Reserve examination materials describe credit to acquire or improve non-owner-occupied rental property as business-purpose credit. That treatment applies at four units and at five, so the fifth unit does not change it.
Common Mistakes
- Running the gross-rent formula on a five-unit building and assuming the lender will do the same.
- Counting an unpermitted or informal unit in the unit total.
- Quoting terms before pulling a rent roll and trailing expenses.
- Comparing a gross-rent coverage ratio to a net-income coverage ratio as if they were the same measure.
- Treating a strong credit score as enough at five units, when the building’s financials and the borrower’s experience carry more weight.
- Forgetting that a larger down payment never erases leverage caps, credit floors, reserve rules or property eligibility. The strongest files clear both tests: enough equity and enough rental coverage.
What to Ask a Lender Before You Add the Unit
- Does your program reach five-plus units, and what is the unit range?
- Is the coverage test gross rent against PITIA or net income against debt service?
- What leverage, reserves and credit score apply at this tier?
- How much rent history do you need on the new unit before you count it?
- What appraisal type and third-party reports will you order?
- Are there prepayment penalties, balloon terms or adjustable periods?
- Do you want a rent roll and trailing operating statements, and for how many months?
- What happens to my existing loan if I refinance before or after the conversion?
Frequently Asked Questions
Can a DSCR loan finance a five-unit building?
Sometimes. Many DSCR programs stop at four units, but select lenders reach into the five-plus range with narrower availability and file-by-file terms. Expect a net-income style test and more documents than a fourplex file.
Why does financing change at five units?
Lenders treat one-to-four units as residential and five or more as commercial multifamily. That classification changes the appraisal method, the coverage formula, the documents and the loan structure. The line is a lending convention rather than anything about the building itself.
Will a fifth unit make my loan smaller or larger?
It can go either way. The net-income test deducts operating expenses and often asks for more cushion, which can shrink the amount. A strong rent roll, low expenses and a higher income-based value can support a larger loan. Running both calculations on your own building answers it.
Does the fifth unit have to be legal?
Yes. Lenders and appraisers count permitted, documented units. A unit without a permit and certificate of occupancy may not count, and it can complicate the whole file.
Should I refinance before or after adding the unit?
It depends on the lender pool and the numbers. Refinancing first keeps you in the residential lane, with wider choice. Refinancing after the conversion lets the stabilized five-unit income support the value, but in a narrower lane. Check prepayment terms on your current loan first.
Where This Leaves You
If you are buying or refinancing a rental property and want to see how the numbers work, Lendmire can help you compare DSCR loan options based on the property income, credit profile, leverage, and investor goals. To talk through a fourplex that is growing, reach Lendmire at 828-256-2183. Qualification is subject to lender guidelines and is not a commitment to lend.
A fifth door adds rent, but it also changes the test the rent has to pass, so measure the building both ways before you pour a foundation or sign a permit.
About Lendmire
Lendmire is a non-QM mortgage brokerage (NMLS# 2371349) arranging DSCR investor loans in 41 markets, including Washington, D.C. DSCR eligibility is generally reviewed around property-level rental income rather than personal income, subject to lender and program guidelines, a fit for self-employed investors and LLC-owned portfolios. Lendmire was recognized as a Scotsman Guide Top Mortgage Workplace in 2025 and 2026.
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References
1. Rentana: How Does Financing Differ in Small vs. Large Multifamily Properties
3. Federal Reserve examination attachment on business-purpose credit
This article is part of Lendmire’s DSCR loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: How Much a DSCR Lender Lends on a Greenville SC Rental · How Much a DSCR Cash-Out Lends When the Lease Ends in Three Months · How Much a DSCR Loan Lends When Tax Returns Show No Income
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Disclosures. The information presented in this article is general market commentary, not financial, legal, or tax advice. Lendmire is a mortgage brokerage (NMLS# 2371349) — not a direct lender or depository institution — and loan placement is subject to lender underwriting. Nothing in this content represents a commitment to lend. Loan terms, pricing, and program availability vary based on borrower qualifications, property characteristics, and state of subject property, and are subject to change at any time. Lendmire complies with Equal Housing Opportunity requirements. Consumer access: nmlsconsumeraccess.org.