Casita Site Planning in Liberty Hill and Leander

Liberty Hill and Leander have some of the most varied residential land in the North Austin metro. In one afternoon, we can see a new-construction home with a 60-foot backyard and a ranch-style house on five acres of rock and cedar. Both families may want the same thing, a casita for a parent or grown child, but the site plan will be completely different.

The goal: a balance of three things

Where a casita goes is a balance of privacy, practicality and the yard you want to keep. A spot that maximizes one usually costs another. The goal of site planning is to find the location where all three are acceptable.

Privacy and entrances

Privacy is about what people see and hear, not just distance. A casita 30 feet from the house can feel private if its entrance and windows face away. A casita 100 feet away can feel exposed if its living room window looks straight at the main house's back patio.

We think about entrances first. Where will the person living there walk in and out? If they come and go independently, a path from the driveway that doesn't cross the main house's patio gives both households space. If the casita is for a parent who will share meals and need occasional help, a short path to the main house's back door matters more.

Slope

Hill Country lots are rarely flat. Slope affects:

• Foundation: a casita on sloping ground may need one side built up, which changes the foundation design.
• Drainage: the ground must slope away from the casita on every side. On a hillside, water from above has to be diverted around it.
• Sewer: gravity sewer needs consistent fall from the casita to the main line or septic system. The relative elevation of the casita drain and the approved connection matters more than the slope alone; a lower building may require a pumped solution.
• Access: a steep path is harder for an older parent and for construction equipment.

Septic

Many Liberty Hill properties and some Leander properties use septic systems. The tank and drain field limit where buildings, driveways and heavy equipment can go. Adding a bathroom may also affect whether the existing system has enough capacity. We locate the system before we choose a site.

Utility routes

Every casita with a bathroom needs water, sewer and power, and often internet. We map:

• The location of the house's water line, sewer cleanout and electric panel
• The shortest trench route that avoids trees, septic and existing lines
• The run length, because longer electrical runs need larger wire
• Whether rock near the surface will slow trenching

On larger lots, utilities often decide the site more than any other factor.

Illustrative Liberty Hill planning scenario

A family on three acres wants a casita on a rise behind the house, with a view to the west. The rise is 180 feet from the house's electrical panel and on the far side of the septic field. Trenching around the field adds length, the rise is rocky, and construction access would cross soft ground.

An alternative site 60 feet closer, beside the existing drive, keeps a partial view, avoids the septic field and halves the trench run. The casita's entrance faces a new path from the drive, and its main window faces the pasture instead of the house. In this illustrative scenario, the closer site reduces the utility work and leaves more flexibility for a covered porch.

Illustrative Leander planning scenario

In a newer Leander subdivision, the backyard is 50 feet deep with a utility easement along the back fence. A detached casita would cover most of the remaining yard. An alternative is an attached suite with its own exterior door, which keeps the yard and simplifies utilities. Sometimes the right casita is actually a home addition.

Site-walk checklist

• Who will use the casita, and how independently?
• Where should the entrance face?
• What will each building's windows look at?
• Where are the septic tank and field?
• Where are the water line, sewer cleanout and electric panel?
• What is the slope at each candidate site?
• Can trucks reach each site without crossing septic or soft ground?
• What parts of the yard must stay open?

Related reading

For questions about jurisdiction, easements and surveys, see our guide to planning a backyard ADU in Georgetown; the same checks apply on most lots. You can also read about our work in Liberty Hill and Leander, and about how we build casitas and ADUs.

Bringing the plan into focus

Before choosing finishes or committing to a footprint, separate what you know from what still needs confirmation. The intended use, furniture needs and areas of the property you want to preserve are homeowner decisions. Structural capacity, drainage, utility loads and approval requirements need site-specific review. Keeping those two lists separate makes the first conversation more productive.

Gather any survey, drawings and HOA documents you have. Add photographs of the proposed work area and notes about existing problems such as water collecting near the house, rooms that are difficult to heat or cool, or awkward access. Inspiration images are useful when you can explain what you like about them: daylight, circulation, a sheltered entry or a particular material transition.

A written scope should identify the work included, the decisions still open and any design or engineering needed before construction. Do not assume a plan image includes site preparation, utility connections or every finish you have in mind. Those details belong in the project discussion and the documentation that follows.

Next step

A site walk is the best way to see these trade-offs. We'll mark candidate locations and talk through each one with you.