San Marcos Custom
Home Builders

Custom homes in the hills above the river,
built to the code the city actually enforces.

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Building in San Marcos, Texas

San Marcos is the most regulated ground we build on, and that is not a complaint. It sits on the Edwards Aquifer recharge zone, above springs that feed a river people have been protecting for a very long time. The rules exist for a reason, and a builder who knows them is worth more here than anywhere else we work.

Summit Oak Builders has been building custom homes across the Texas Hill Country for more than 20 years. We take on a limited number of homes at a time, which is the only honest way to give an owner the access and attention a custom build actually requires. You will know your builder by name.

Inside the city, a San Marcos build runs through the city’s development code — impervious cover limits, tree protection, drainage. Outside it, Hays County. Knowing which set applies to your lot, and what each will actually allow you to build, is the work that happens before a single drawing.

What building in San Marcos actually involves

San Marcos is the Hays County seat and an incorporated city with a development code that has real teeth, particularly over the aquifer. Here is what shapes a build on this side of the county.

City limits, or Hays County?

Inside the city, permitting and the development code run through San Marcos. Outside, it is Hays County. The requirements differ meaningfully, so we confirm which applies before design starts.

Edwards Aquifer recharge zone

Much of this area sits over the recharge zone, which brings state water-quality requirements on top of local rules. It is identified at the lot-review stage, not discovered mid-permit.

Impervious cover limits

Over the recharge zone, how much of your lot you are allowed to cover is capped. That governs the footprint, the driveway and the patio together — which is why we size the house against the limit early.

Tree protection

San Marcos protects significant trees under its development code. Removals can require permits and mitigation, so we survey what is on the lot and design around the trees worth keeping.

Drainage and floodplain

The San Marcos and Blanco rivers meet nearby and the mapping was revised after 2015. Drainage requirements are taken seriously here; we check current mapping before design.

Septic or city sewer

In town you will likely connect to city utilities. On acreage outside, expect an on-site sewage facility permitted through Hays County, with the soil evaluation done before the floor plan is final.

Where we build around San Marcos

We build in San Marcos and throughout the surrounding Hays County Hill Country, including the acreage west of town toward Ranch Road 12 and the tracts along the river corridor.

We also build in Wimberley, Blanco, Canyon Lake, Spring Branch, Bulverde and Seguin. See all of our communities.

About San Marcos

San Marcos grew up around its springs. The river runs clear and cold out of the Edwards Aquifer year round, and the city has been built around protecting that for longer than most Texas towns have thought about such things.

It sits at the midpoint of the I-35 corridor, which makes it one of the few places where Austin and San Antonio are both genuinely commutable. Texas State anchors the town, San Marcos CISD serves the families, and the hills west of the city are where most of the custom homes go up.

Those hills are the draw: limestone, oak, long views back across the valley, and the river close enough to reach on a Saturday morning. Lots there are not cheap, and they are worth building on properly.

Common questions about building in San Marcos

Is my lot inside San Marcos city limits or in Hays County?

It is the first thing we check. Inside the city, your build runs through the San Marcos development code; outside, through Hays County. The two differ meaningfully, especially over the aquifer. Send us the address and we will confirm it.

It is the share of your lot covered by anything water cannot pass through — roof, drive, patio, walkways. Over the Edwards Aquifer recharge zone that share is capped, so it effectively sets the size of what you can build. We size the design against your lot’s limit before drawings start.

Not freely inside the city. San Marcos protects significant trees under its development code, and removals can require permits and mitigation. We survey the lot first and design around what is worth keeping, which usually makes for a better house anyway.

Yes — most of our homes are built on land the owner brings us. If you have not bought yet, talk to us first; we will review the lot for cover limits, trees, drainage, slope and utilities before you are committed to it.

Design through completion depends less on square footage than on the site and the approvals. City review, aquifer requirements, tree permits and drainage all happen before a slab is poured. We give you a real schedule once we have walked the land and seen what applies.

Have a lot in mind?

Send us the address and we’ll walk it — access, slope, septic feasibility, water, and what it will genuinely cost to build on. Before you close, not after.

Use the form below, email contact@summitoakbuilders.com, or call our Canyon Lake office at 830-625-1111.

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