Round Rock ADU Builders: How to Finance an ADU in Texas: HELOC vs Loan

How to Finance an ADU in Central Texas

Most ADU projects are funded one of three ways. Each has a different cost structure, a different approval process, and, importantly for scheduling, a different way of releasing money to the project. That last point gets overlooked and causes more delays than it should.

We are builders, not lenders or financial advisors. What follows is a description of how these structures interact with construction, not a recommendation about which one suits your finances.

Option One: Home Equity Line of Credit

Direct answer: A HELOC is a revolving line secured against the equity already in your home. You draw what you need when you need it and pay interest on the drawn balance. Closing costs are typically lower than a construction loan and approval is usually faster, but the available amount is capped by your existing equity and rates are commonly variable.

Where it works well: Homeowners with substantial equity funding a moderate project, particularly garage conversions and smaller casitas where the total is comfortably within the available line.

Where it gets tight: Larger detached builds where the required amount approaches or exceeds available equity. Variable rates also introduce uncertainty over a build that may run several months.

Construction impact: Generally the smoothest of the three. You control when funds are drawn, so paying subcontractors on schedule is straightforward.

Option Two: Construction Loan

A construction loan is written specifically against the project. The lender approves based on plans, permits, the builder’s contract, and often an as-completed appraisal, then releases funds in stages as work is verified complete.

Where it works well: Larger detached ADUs, and homeowners without enough existing equity to cover the build through a HELOC. Because it underwrites against the finished value, it can fund projects a HELOC cannot.

Where it gets complicated: More documentation, a longer approval process, and inspections at each draw stage. Some lenders have requirements about builder qualifications and contract structure that need checking early.

Construction impact: This is where the draw schedule matters. Funds arrive only after a milestone is inspected and approved. If a draw is tied to a stage that does not match when materials must be ordered or a subcontractor must be paid, the project can pause with money sitting in an approved but unreleased loan.

We ask about the draw schedule before scheduling work precisely because of this. Aligning the construction sequence to the lender’s milestones at the start avoids stalls later.

Option Three: Cash-Out Refinance

Refinancing the primary mortgage for more than the current balance and taking the difference as cash. This replaces your existing mortgage entirely.

Where it works well: When prevailing rates are at or below your current mortgage rate, so the refinance is not costly in itself.

Where it does not: When your existing mortgage carries a rate well below current market. Giving up a low rate to fund an ADU can cost far more over the life of the loan than the project is worth. This is the single most important thing to check before considering this route.

Construction impact: Funds are available in a lump sum at closing, so construction cash flow is uncomplicated.

The Question Lenders Will Ask

Whichever route you take, expect the lender to want to understand whether the ADU will be rented and whether that income is being counted toward qualification. The documentation requirements differ meaningfully depending on the answer, so decide your intent before applying rather than revising it midway.

What We Need From You

To keep construction moving, we need to know three things early:

Which structure you are using. It determines how payment timing has to be sequenced.

The draw schedule, if there is one. We build the construction schedule around it rather than discovering the mismatch at the framing stage.

Whether an as-completed appraisal is required. These take time to order and can sit on the critical path before construction can begin.

None of this is complicated, but all of it is much easier to handle at the start than at the point where a subcontractor is waiting to be paid.