Money & Risk | Financing

Financing a Duplex to Fourplex in Texas: 2026 Loan Limits

A building of two to four units can be financed with a home loan, the same type used for a house, if you follow the rules for that size of property. This page gives the 2026 loan limits for Texas, the FHA rules on living in the property and counting rent, the Fannie Mae rules on rent and accessory units, and the Texas Constitution's rules on borrowing against a homestead. VanPlex does not lend in the United States. Confirm every loan term with a lender before you sign.

The 2026 Loan Limits in Texas

A conforming loan is a home loan small enough for Fannie Mae or Freddie Mac to buy from the lender. The Federal Housing Finance Agency (FHFA) sets the size limit each year, and the limit rises with the number of units. FHFA announced the 2026 limits on November 25, 2025: "In most of the United States, the 2026 CLL value for one-unit properties will be $832,750, an increase of $26,250 from 2025."

Every Texas county sits at that baseline. In the FHFA county file, each Texas row carries the same four values; the Harris County row reads "832750, 1066250, 1288800, 1601750."

Source: FHFA 2026 county loan limit file (XLSX).

A loan above the limit for its unit count falls outside the conforming limit. FHA (Federal Housing Administration) loans have their own county limits, which this page does not list; ask a lender or HUD for the 2026 FHA limit in your county.

FHA Loans: Live There and Pass the Rent Test

FHA loans follow the rules in the US Department of Housing and Urban Development (HUD)'s Single Family Housing Policy Handbook 4000.1, last revised August 12, 2026. The handbook sets four rules that matter for a small multiplex.

You must live there. "At least one Borrower must occupy the Property within 60 Days of signing the security instrument and intend to continue occupancy for at least one year."

The loan can reach 96.5 percent of the value. "For purchase transactions, the maximum LTV is 96.5 percent of the Adjusted Value." LTV, or loan-to-value, is the loan divided by the property value. A credit score of 580 or more qualifies for that maximum; a score of 500 to 579 is limited to 90 percent.

Three and four units must pay for themselves. "The PITI divided by the monthly Net Self-Sufficiency Rental Income may not exceed 100 percent for three- to four-unit Properties." PITI is the monthly payment of principal, interest, taxes and insurance. Net self-sufficiency rental income is the appraiser's fair market rent for all units, including the one you live in, minus the greater of the appraiser's vacancy and maintenance estimate or 25 percent. In plain terms, the payment can be no more than 75 percent of the appraiser's full rent for all units, and less if the appraiser's vacancy estimate is higher.

Keep cash in reserve. "The Mortgagee must verify and document Reserves equivalent to three months' PITI after closing for three- to four-unit Properties." Reserves are savings left after closing.

The test uses the appraiser's rent estimate. Ask the lender to run it with the appraiser's figures before you make an offer, and read the landlord rules page for the state rules on leases and late fees.

Fannie Mae: Counting Rent and ADUs

Fannie Mae buys conventional loans that meet its Selling Guide. Section B3-3.8-02, dated September 2, 2026, covers rent from the property you are buying. On a purchase, "the lender must multiply monthly gross rent by 75% for the net rental income amount, then subtract the PITIA of the subject property from the net rental income." PITIA adds homeowners association dues to PITI. If you have less than 12 months of experience managing rentals, a positive result can only offset the property payment.

Accessory dwelling units (ADUs) have their own rules. Section B2-3-04, dated October 8, 2025, says: "Only one ADU is permitted on the parcel of the primary one-unit dwelling. ADUs are not permitted with a two- to four-unit dwelling." When ADU rent is used to qualify, B3-3.8-02 allows it from one existing ADU, only on a purchase or a limited cash-out refinance, and caps it: "The qualifying rental income amount from the ADU is limited to 30% of the total qualifying income."

FHA and Fannie Mae Side by Side

Sources: HUD Handbook 4000.1, Fannie Mae B3-3.8-02, Fannie Mae B2-3-04. Cells marked "not covered" or "not verified" are rules this page does not state; ask the lender.

City Rules and Loan Rules Together

The city decides what you may build, and the loan program decides how it is financed. The two use different words. Houston's Chapter 42 treats a house plus a detached second dwelling unit of up to 1,500 square feet as single-family residential. Austin's HOME rules allow up to three units on an SF-3 lot and dropped the "accessory" label. San Antonio allows one ADU next to a house, and up to four units in RM-4. The ADU page compares the cities.

Fannie Mae's rule allows one ADU only next to a one-unit dwelling. So a duplex with a backyard cottage, or a fourplex with an extra unit, does not fit B2-3-04 as written. Before you design, ask the lender how it will classify the finished property: as one unit with an ADU, or as a two-, three- or four-unit property. The answer sets the loan limit, the rent rules and the program.

Borrowing Against a Texas Homestead

Article XVI, Section 50 of the Texas Constitution sets which loans can be secured by a homestead. Two of its rules matter for an owner who wants to add units.

Home equity loans. Article XVI, Section 50(a)(6) sets the rules. The loan plus all other debt on the homestead may not be more than "80 percent of the fair market value of the homestead on the date the extension of credit is made." The loan must be without personal recourse, which means the lender can look only to the home if you default. It may not close before the 12th day after you apply or receive the required notice. It must close "only at the office of the lender, an attorney at law, or a title company." It must be the only debt of its kind on the homestead, apart from purchase money, improvement and certain other liens.

Loans to build. Section 50(a)(5) allows a lien for "work and material used in constructing new improvements thereon, if contracted for in writing." Work to repair or renovate existing improvements needs a written contract with the consent of both spouses, and the contract may not be signed until the fifth day after the owner applies for the credit, with an exception for emergency repairs.

What counts as a homestead. Under Section 51, a homestead in a city, town or village is a lot or contiguous lots of no more than 10 acres. "Any temporary renting of the homestead shall not change the character of the same, when no other homestead has been acquired." These are lending rules; the property tax homestead rules are on the property tax page.

Insurance the Loan Will Need

Insurance is part of the PITI payment, so it enters the FHA rent test and Fannie Mae's rent math. The Federal Emergency Management Agency (FEMA)'s flood insurance page says homes and businesses in high-risk flood areas with mortgages from government-backed lenders are required to have flood insurance, and that there is typically a 30-day waiting period before a National Flood Insurance Program policy takes effect. On the coast, wind coverage from TWIA for a new building needs a windstorm certificate from the Texas Department of Insurance. Price both before you apply. The insurance and flood page has the steps.

Questions to Ask a Lender

• Will the property be classified as one unit with an ADU, or as a two- to four-unit property?
• What is the 2026 FHA loan limit for this county and this number of units?
• What rent will the appraiser use, and does a three- or four-unit plan pass the FHA self-sufficiency test?
• How much of the expected rent will count toward my income, given my landlord experience?
• What down payment and reserves does this loan need?
• If I borrow against my homestead, how does the 80 percent limit apply to my current mortgage?

Interest rates, fees and down payments change and differ by lender, so this page states none. Get them in writing from a licensed lender.

Where to Go Next

Related on VanPlex: financing 2 to 4 units in California and the Texas multiplex guide overview.

Frequently Asked Questions

Official sources (checked October 2026)