The Quick Read: Yes, a HELOC can fund an accessory dwelling unit on your Texas primary residence, but the loan must keep total debt at or below 80% of the home’s current value, stand as the only equity lien, follow a written notice period, and be signed at a lender, attorney, or title office. Texas treats the line as a regulated home equity loan, so the state constitution sets the guardrails, not the lender.
- The 80% combined-loan-to-value cap is constitutional. It counts your first mortgage plus the full line, not only the drawn balance.
- Texas allows one home equity lien on a homestead at a time, so a HELOC and a cash-out refinance compete for the same slot.
- The cap is measured on today’s value. Do not count on a value that assumes the finished ADU.
- A contractor lien under a separate construction-lien rule is a different legal route with different steps.
- These rules bind a homestead only. A non-homestead rental follows a different path, including a DSCR cash-out.
How Does Texas Treat a Loan Secured by Your Homestead?
Texas protects a homestead from forced sale and allows only a short list of liens against it. Home equity loans, including HELOCs, are one item on that list. The Texas A&M Real Estate Research Center explains that the home equity requirements are written into the constitution itself and include the 80% limit. The lien must also be voluntary. It needs a written agreement with the consent of each owner and spouse, and it cannot leave blanks for key terms.
How large a line the equity supports in Texas.
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 80% 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.
The list of allowed liens lives in Article XVI, Section 50 of the Texas Constitution. One entry covers a home equity loan. Another covers work and material used in constructing new improvements, when contracted for in writing. That second entry is a different route from a HELOC, and the difference matters for an ADU.
The home equity provisions do not tie the money to a purpose. That is why a HELOC can pay for an ADU, a kitchen, or a roof. Have a Texas title attorney confirm this for your file, because the lender will confirm it on its side.
Lendmire is a mortgage broker that arranges home equity lines through select wholesale partners in its network, including in Texas. It does not lend directly. Every figure below is subject to lender guidelines and full file review.
Is an ADU on a Texas Homestead Part of the Homestead?
A detached unit on the same lot as your home is usually treated as part of the same property. The harder question is what happens when someone rents it. Use drives the answer, and it affects three separate areas.
| Use of the ADU | Loan effect | Property tax effect |
|---|---|---|
| Family or guest use | Fits a homestead line | Usually stays within the exemption |
| Rented to a tenant | Lender may ask about use | Exemption may not cover that portion |
| Owner lives in it | Fits a homestead line | Residence rules apply |
Keep the legal pieces apart. The forced-sale protection of the homestead is a constitutional question. The property tax exemption is a tax-code question. The Texas Comptroller’s page on property tax exemptions explains that the residence homestead exemption requires the owner to use the home as a principal residence. Renting part of the property can raise questions on the tax side without automatically ending forced-sale protection.
A new ADU also changes your appraised value for tax purposes. Ask your county appraisal district how it treats new improvements before you build.
ADU zoning is local. Texas has no single statewide ADU rule, so your city or county code sets size, setbacks, height, parking, and owner-occupancy conditions. Deed restrictions and HOA covenants can bar an ADU even when the city allows it. Check those first, because a loan cannot fix a prohibition.
Can a HELOC Actually Fund the Build?
Yes, and the mechanics are specific. Texas rules apply to a primary residence, and the network Lendmire works with follows them. Here is what a borrower should expect.
Leverage. A Texas primary residence caps at 80% combined loan-to-value in the network, and the higher tiers that apply in other states never apply here. By credit tier, a 640 or better profile can reach that 80% cap. A 620 to 639 profile is limited to 70%, and a 600 to 619 profile is limited to 60%. Lines up to $500,000 are typical for these tiers, and larger lines up to $750,000 have stricter credit and appraisal conditions.
Valuation. Lines at or below $500,000 ordinarily use an automated valuation rather than a full appraisal. The value is the home as it stands today. A policy explainer on ADU financing notes that some lenders value a project from architectural plans after improvement. That approach can be hard to apply where comparable properties with ADUs are scarce. A HELOC does not work that way, so do not assume the finished ADU adds borrowing room.
Structure. The line sits in first or second lien position. Primary residence lines come with either a 3-year interest-only draw followed by a 17-year repayment, or a 5-year draw followed by a 25-year repayment. At least 75% of the line is drawn at closing. After closing, Texas sets the minimum additional draw at $4,000.
That last point matters for construction. If you plan staged contractor payments, a line drawn mostly at closing behaves more like a lump sum than a flexible construction account. You would carry most of the balance from day one.
Process rules. The lender must deliver a written notice, and the closing cannot occur before the 12th day after that notice, per the statutory text reproduced by a market source. Closing takes place at the office of the lender, an attorney, or a title company. Borrowers also have a right to cancel after signing. In the network, Texas primary residences also face a 12-month seasoning expectation and the one-lien-at-a-time rule.
Property and title. The property must be a single-family home, a 2-4 unit property, a PUD, a townhome, or a condominium, and Texas properties are limited to 10 acres. Manufactured homes are not eligible. A property listed for sale, or listed within the past 60 days, is ineligible in Texas. Title must sit with the individual borrower or a revocable living trust. An LLC, corporation, or partnership cannot hold title on a home equity line.
A Worked Example, in Percentages
Picture a homeowner with a first mortgage equal to 55% of the home’s current value and a credit profile of 640 or better. The 80% cap leaves room equal to 25% of the home’s value for a new line.
Now suppose the ADU budget equals 20% of the home’s value. That fits under the cap on paper, with 5% of value to spare. The cushion shrinks quickly because the full credit limit counts against the cap, not only the drawn balance. If the borrower sets the limit above the budget to cover overruns, the extra limit uses cap room too.
Run the same file at a 620 to 639 profile. The cap drops to 70%, which leaves room equal to 15% of value. The same 20% budget no longer fits. The borrower would need to shrink the build, add savings, or raise the credit score first.
These are modeled percentages, not market data. A lender also reviews debt-to-income, which the network caps at 50%, and the file is reviewed on the interest-only payment calculated on the maximum draw. A strong equity position does not replace that test.
Which Financing Route Fits an ADU Best?
The right tool depends on how you plan to build and how you plan to use the unit.
| Route | Texas fit | Main constraint |
|---|---|---|
| HELOC | Flexible use of funds | 80% cap, one lien |
| Closed-end equity loan | Lump sum for a fixed budget | Same cap, same one-lien slot |
| Cash-out refinance | Replaces the first mortgage | Uses the one equity slot |
| Construction lien | Contractor-backed new build | Written contract, spousal consent |
| Cash savings | No lien at all | Ties up liquidity |
The construction-lien route under the constitution’s new-improvements provision is a legal path of its own. The contract must be in writing before work starts, and a family homestead needs spousal consent. For new construction, some of the waiting and signing rules that apply to renovations of existing improvements do not apply. Whether a detached ADU counts as a new improvement, while a garage conversion counts as a renovation, can turn on the facts. Let a Texas title attorney decide that before you pick a route.
The one-lien rule shapes the whole plan. If a HELOC now secures the homestead, you cannot add another home equity loan until you pay it off or convert it. That blocks a later cash-out refinance of the same home. If you expect to refinance soon, a construction lien or cash may leave more flexibility.
Lendmire’s own piece Texas Rental HELOC vs Homestead Equity Rules That Apply covers how the homestead and non-homestead lanes differ when a borrower holds both kinds of property.
What About Fannie Mae, DSCR, and the Agency Route?
Agency loans can also finance ADU additions. Fannie Mae’s accessory dwelling unit page confirms that ADUs can appear in its mortgage products. That is a contrast point only. Texas homestead equity lending runs on its own constitutional rules, and DSCR loans are not agency products.
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.
That distinction opens a practical exception. The homestead rules bind a primary residence. If you own a Texas rental that is not your homestead, an ADU on that rental sits outside the 80% homestead cap and the one-lien rule. Two paths then make sense:
1. A DSCR cash-out refinance on the rental. Across most of the network, cash-out refinances top out near 75% LTV, and about 6 months of seasoning is the common expectation. A credit profile around 660 is what most programs want, and 700 or better opens the strongest tiers. Select programs start at a 1.00 coverage floor, and a separate select-lender path goes below 1.00 with leverage and terms adjusted. Loan sizes run up to $3,000,000 on standard programs (smaller balances available through select lenders).
2. An investment-property equity line. On an investment property, the network’s line is limited to 70% CLTV, requires a 700 minimum credit profile, and caps at $500,000 total. It uses the 5-year draw and 25-year repayment structure only.
Qualification on a DSCR loan runs primarily on property-level rental income covering the payment, subject to lender guidelines. The ratio compares rent to principal, interest, taxes, insurance, and any HOA dues. Clearing 1.00 does not mean positive cash flow, because repairs, vacancy, management, utilities, and capex sit outside the calculation. A new ADU that adds rent can lift the coverage number once it is leased, but the lender reviews the property as it exists when the loan is placed. Reserves vary by lender, leverage, loan size, and transaction type, and commonly run near 6 months of PITIA.
If an LLC holds the rental, a DSCR loan can often accommodate that, subject to lender program eligibility. A home equity line cannot, because title must sit with an individual or revocable trust. A property already deeded to an LLC needs a vesting change before a line, or a DSCR cash-out instead.
Investors who want the full picture can read the complete DSCR loans guide.
Key Terms Defined
Homestead: The home you live in as your primary residence, which Texas protects from forced sale except for a short list of allowed liens.
Home equity loan (HELOC or closed-end): A loan secured by your homestead that is regulated by the constitution’s home equity provisions, including the 80% cap and one-lien rule.
Combined loan-to-value (CLTV): Your first mortgage plus the new line, divided by the home’s current value.
Construction lien: A contractor-backed lien for new improvements, created under a separate constitutional provision with its own written-contract and spousal-consent requirements.
DSCR: A ratio that compares a rental property’s monthly rent to its monthly principal, interest, taxes, insurance, and dues.
What Mistakes Hurt Texas ADU Plans Most?
Most problems come from assumptions made before the lending rules are checked.
- Counting the finished ADU toward the cap. The cap rests on current value, so a plan built on after-completion value usually comes up short.
- Sizing the line to the budget exactly. The whole credit limit counts, so overrun cushion eats cap room.
- Forgetting the one-lien slot. A HELOC now can block a refinance later.
- Skipping the spouse. Both owners and spouses must consent to the lien.
- Ignoring deed restrictions and HOA rules. A city permit does not override them.
- Treating the home as a rental asset. The home equity loan is non-recourse except for actual fraud, which limits the lender’s remedies but not the risk of foreclosure on your home.
- Assuming rental income changes nothing. Renting the ADU can change tax treatment and how a lender reads the use of the property.
Tax treatment can depend on how the funds are used and how the property is held; investors should keep clear records and speak with a qualified tax professional before relying on any deduction.
What Does the Timeline Look Like?
Sequence matters more than speed, because several steps depend on the ones before them.
1. Confirm the city’s ADU rules, deed restrictions, and any HOA covenants.
2. Confirm who must sign, including each owner and spouse.
3. Gather quotes and set a budget with a cushion.
4. Check your combined leverage against the 80% cap using current value.
5. Request the line and receive the lender’s written notice.
6. Wait until the 12th day after that notice has passed before closing.
7. Sign at a lender, attorney, or title office.
8. Pull permits and begin work, drawing on the line as needed.
9. Finish construction and obtain final approval for occupancy.
If you pick the construction-lien route, the written contract comes before work, and the notice and signing rules differ. Counsel should confirm which path applies to your project.
Texas homestead lending also carries real legislative history, since the home equity amendments changed over time. Ask the title company to confirm the current rules before you sign.
Lendmire can help compare these routes if you want to see how the numbers work. Its team can reach you at 828-256-2183, or you can use the quote request page.
Frequently Asked Questions
Can I rent the ADU after I build it with a HELOC?
Yes, nothing in the loan stops you from renting it, but the consequences vary by area. The tax exemption may not cover a rented portion, and a lender may ask how you will use the unit. Forced-sale protection and the tax exemption are separate questions, so renting does not automatically strip homestead protection. Confirm the facts of your project with a Texas attorney.
Can I hold a HELOC and a home equity loan on the same Texas homestead?
No. Texas allows one home equity lien on a homestead at a time. A HELOC and a closed-end equity loan or cash-out refinance compete for the same slot. A contractor lien under the new-improvements provision is a different category.
Does my spouse have to sign?
Yes, in most cases. The home equity lien needs the written consent of each owner and spouse. A construction lien on a family homestead also requires spousal consent. A non-borrowing spouse still has to sign.
Will the finished ADU raise how much I can borrow?
No. The 80% cap uses the home’s fair market value at closing, so the unfinished ADU adds nothing. Lines at or below $500,000 usually rely on an automated valuation of the existing home. A higher value after construction may help a later transaction, depending on comps and underwriter review.
Does this apply if I want to build an ADU on a rental property?
No. The 80% cap, notice period, and one-lien rule bind a homestead. A non-homestead rental follows different options, such as a DSCR cash-out refinance or an investment-property line. Eligibility depends on the property, the credit profile, the leverage, and current lender guidelines.
About Lendmire
Lendmire (NMLS# 2371349) is a mortgage broker. Home equity lines of credit — on a primary residence, a second home or an investment property — are arranged through wholesale lenders in Lendmire’s 16 full-service states, and every line is underwritten by the lender under its program 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. Texas A&M Real Estate Research Center — What to Know About Home Equity Loans in Texas
2. Justia — Texas Constitution, Article XVI, Section 50
3. Texas Comptroller — Property Tax Exemptions
4. Smart Growth America — ADU Financing Explainer
5. Fannie Mae — Accessory Dwelling Units
This article is part of Lendmire’s home equity line of credit program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Can a Texas Homestead on Acreage Hold a HELOC and Cash-Out Lien? · HELOC Rules for a Texas Homestead With a First Mortgage · How to Get a HELOC in Texas Under the Homestead Equity Rules
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
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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.