Bank Statement HELOC Rules for Building an ADU on a Texas Homestead

The Quick Read: Two separate tests decide this loan. Bank statements prove your income, and Texas homestead law caps how much the home can borrow. Clearing the first test never loosens the second. A self-employed owner can use deposit-based income, but the line still has to fit inside the equity limit.

• Bank statements change how income is documented. They do not change the 80% combined loan-to-value cap on a Texas primary residence.
• The line is sized off the home’s value today. A detached ADU that does not exist yet generally adds nothing to that value.
• Texas allows one home equity loan or line on a homestead at a time, so an existing cash-out loan can block a new line.
• At least 75% of the line is funded at closing on the programs in Lendmire’s network, so it works more like a mostly funded loan than a draw-as-you-build account.
• Projected ADU rent generally does not count as qualifying income on a primary-residence line.

You are probably self-employed, with write-offs that shrink your taxable income. That is exactly why a bank statement line exists. It is also why people assume the usual limits bend for them. They do not.

Key Terms Defined

Bank statement HELOC: a home equity line of credit where the lender reads your deposits instead of your tax returns to measure income.

Homestead: the home you live in as your primary residence, owned by you as an individual, which Texas protects from forced sale.

ADU (accessory dwelling unit): a second, smaller dwelling on the same lot, such as a detached backyard unit or a garage conversion.

CLTV (combined loan-to-value): all loans secured by the home, added together, divided by the home’s value.

Expense factor: the share of business deposits a lender treats as operating costs before counting the rest as income.

One-lien rule: the Texas limit allowing only one home equity loan or line secured by the homestead at a time.

What Does Bank Statement Income Actually Change?

Bank statement income changes one step: how the lender proves you can carry the payment. Everything else on a standard line stays the same, including the credit review, the equity test, the debt-to-income check, and the property review.

Here is how that step usually works. Bank statement files typically review 12 to 24 months of personal or business statements. The lender screens out transfers between your own accounts and one-time loan proceeds. It averages the remaining deposits. For business accounts, it applies an expense factor, and each program sets its own. A profit-and-loss statement or a tax preparer’s expense letter can sometimes stand in for the factor.

The result is a monthly income figure, and the lender tests it against your debts. The qualifying payment is calculated on the interest-only payment at the maximum draw, not on what you plan to borrow. Debt-to-income tops out at 50% across the network, and 45% for credit profiles from 600 to 679. A ratio above 45% requires a 680 score. Exact terms depend on lender and investor guidelines, credit profile, reserves, and property review.

This is not a no-paperwork product. The file is reviewed on documented income under the applicable program, subject to lender guidelines. The lender still reviews credit, equity, debts, and the property.

Which Texas Homestead Rules Shape an ADU Line?

Texas homestead rules cap leverage and dictate procedure, whatever income method you use. The Texas Constitution’s home equity section requires you to keep at least 20% equity, bars other property or wages as security, and excludes rentals and second homes, according to the Texas Real Estate Research Center at Texas A&M.

In practice, those rules turn into five checkpoints for an ADU borrower:

1. The 80% ceiling. Texas caps a primary residence at 80% combined loan-to-value. Higher tiers on the general matrix never apply to a Texas homestead.

2. The 12-day notice. The lender must deliver a separate written notice at least 12 days before closing. It binds primary residences only.

3. One lien at a time. An existing home equity loan or line must be resolved before a new one can be placed.

4. Seasoning. A 12-month spacing applies to primary residences after a prior Texas cash-out.

5. Acreage. Texas properties on the network’s programs are limited to 10 acres.

Two network rules matter just as much. A property listed for sale, or listed within the past 60 days, is ineligible in Texas. Title must sit in your name or in a revocable living trust. An LLC or corporation cannot hold title on this product, and an LLC cannot hold homestead protection in any case.

Manufactured homes are not offered on these programs. That matters if your ADU plan involves a factory-built unit, so confirm the construction type before you apply.

How Does an Unbuilt ADU Change the Sizing?

It changes nothing in your favor. The line is sized off the home’s value on the date credit is extended, and a structure that does not exist yet generally does not raise that value. Lines at or below $500,000 ordinarily run automated valuation. Above $500,000, a full appraisal is required, and you can request one on any line.

Run the sizing with percentages instead of dollars. Say your existing mortgage and other liens equal 55% of the home’s current value. The 80% cap leaves room for 25% of value across everything new. A new line has to fit inside that 25%, and the ADU’s future worth does not enlarge it.

Your credit profile then shapes the ceiling further. On the primary-residence matrix, most tiers from 640 up reach the 80% Texas cap on lines up to $500,000. Below 640, the ceiling steps down. A 620 score reaches 70% on lines up to $400,000, and a 600 score reaches 60%. The program floor is 600.

Larger lines add conditions. A line above $500,000 is for primary residences only. It requires 700 or better (720 on the five-year draw structure described below), caps at 75% CLTV, and needs a full appraisal. The maximum line is $750,000.

This is the point where many ADU plans stall. A thin equity position caps the line no matter how strong the deposits look. Some builds only pencil after a partial scope, such as a garage conversion, which usually costs less than a detached unit.

How Do the Draw Rules Work During a Build?

The network’s lines run two draw structures on primary residences. The first is a three-year interest-only draw followed by a 17-year repayment period. The second is a 5-year interest-only draw followed by a 25-year fully amortizing repayment. Pricing floats on both and never converts to a fixed amount.

The detail that surprises builders is the funding minimum. At least 75% of the line is drawn at closing on both structures. That makes it a poor match for a pure pay-as-you-build plan. You will carry interest on most of the balance before the slab is poured.

After closing, the Texas minimum for each later draw is $4,000. The five-year structure states that minimum, and the three-year structure does not state subsequent-draw minimums. Confirm which structure your file lands in before you plan contractor payments around it.

If you want to pay a contractor in stages, that is better done from a separate construction-style product. A line fits an owner who wants to borrow most of the amount up front and has the budget set.

Equity Line or Improvement Lien: Which Path Fits an ADU?

Texas treats a contractor’s improvement lien as a different animal from a home equity line. The two paths use different Texas constitutional provisions, and they are not interchangeable.

A construction lien on a homestead is valid only when the work is contracted in writing, and a family homestead needs spousal consent, per this Texas law firm’s explainer. Texas administrative rules also require loans that fund new homestead improvements to comply with that provision, as the Texas Administrative Code on home improvement loans shows.

A detached ADU is new construction, and Texas has no statewide ADU law. Whether you can build one is a local zoning and permit question that comes first. A broker can tell you which of the two paths a given lender writes, but a Texas real estate attorney should review your contract and title.

Where Does the General Rule Break?

Several situations change the answer, and a few end the plan.

You already have a Texas cash-out loan or equity line. The one-lien rule means that loan must be retired first. Stacking a line on top of it is not an option.

Your title sits in an LLC. The line cannot close that way. A property already deeded to an LLC needs a vesting change or a different product entirely.

You want to count the ADU’s rent. Projected rent from the ADU generally does not qualify as income on a primary-residence line. The line is reviewed on your own documented income. Whether renting the unit affects homestead status is something to confirm with counsel before you list it. Tax treatment can depend on how the funds are used and how the property is held; borrowers should keep clear records and speak with a qualified tax professional before relying on any deduction.

You want to leverage a rental instead. A rental property sits outside the homestead rules, and Texas home equity lines cannot be placed on it. Rental equity runs through investor products, and Lendmire’s complete DSCR loans guide explains how those qualify on rental coverage instead. Note that DSCR compares rent to the full monthly obligation only, so clearing 1.00 is not the same as positive cash flow.

Your credit or history is thin. A bankruptcy needs four years of seasoning from discharge or dismissal. Foreclosure history splits by program, and one declines the history regardless of age.

You hold many financed properties. A borrower is limited to three lines, and owning more than 15 financed properties makes you ineligible.

What Do Lenders in the Network Look For?

Lendmire is a mortgage broker, not a lender. It places these files with select wholesale partners, and each partner runs its own guidelines. Which program fits depends on your credit profile, your equity, your project size, and how you document income.

Across the network, the common thread on a Texas homestead is a clean answer to five questions. Do you have enough equity after the 80% cap? Is your credit at 640 or better for the full ceiling? Is the home free of another equity lien? Is title held correctly? Do your deposits support the debt-to-income test at the maximum-draw payment?

The network’s guidance is available only in Lendmire’s 16 full-service states, which include Texas. Every figure here is subject to lender guidelines and a full file review, and none of it is a commitment to lend. Lendmire’s piece on how a bank statement line funds an ADU build on a Texas homestead walks through the application side.

What Should You Prepare Before You Apply?

Get these in order first, because each one has stopped a build somewhere:

• Local permission. Confirm your city allows the ADU type you want, and check any deed or HOA restrictions.
• Existing liens. Pull a payoff on every loan against the home, and add them up against 80% of value.
• Statements. Gather 12 to 24 months of clean statements, and keep business and personal deposits separable.
• Title and spouse. Confirm how title is held, and plan for spousal signatures at closing.
• The contract. Have the builder’s written contract and budget ready so you can size the line honestly.
• Credit. Check for 640 or better, since below that the ceiling steps down.

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 or request a quote.

For current guidelines and terms, see Lendmire’s bank statement HELOC programs page.

About Lendmire

Lendmire — NMLS# 2371349 — is a mortgage broker that arranges home equity lines of credit in its 16 full-service states through wholesale lenders, on primary residences, second homes and investment properties. Every line is subject to the lender’s guidelines and full underwriting. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. Texas Real Estate Research Center, Texas A&M University

2. Fasthoff Law Firm, constitutional versus statutory liens in Texas

3. Cornell Legal Information Institute, 7 Texas Administrative Code §91.705