Building custom homes around Canyon Lake
Iron C Construction is a custom home builder in Canyon Lake, TX, building new homes, additions, and guest houses in the northern Comal County communities around the lake. Robert Castro founded the company in nearby Wimberley in 2020, and the hills and ranch roads along FM 306 and FM 2673 are part of the Texas Hill Country we build in.
Canyon Lake is not a city. It is an unincorporated area, and the Census Bureau counted 31,124 people in the Canyon Lake census-designated place in 2020. That one fact shapes a lot of a new home build here: there is no city hall reviewing plans, so the county, the groundwater district, and in some spots the U.S. Army Corps of Engineers each have a say over what goes on your lot. We sort that out with you before design, not halfway through it.
Who permits a home in unincorporated Comal County
Outside city limits, the Comal County Engineer’s Office handles most of the permits a homeowner deals with. The county’s own building permit is aimed at commercial and public buildings, so on a typical single-family custom home the paperwork centers on these four items:
- Septic (OSSF) permit. Comal County is the state’s authorized agent for on-site sewage systems. The process runs from a site and soil evaluation to a design, an authorization to construct, three inspections, and a license to operate. A professional engineer or registered sanitarian has to design the system on smaller lots, on land platted after January 1, 1988, and anywhere in the Edwards Aquifer recharge zone.
- Floodplain development permit. Required when the Engineer’s Office finds the project inside a regulatory floodplain.
- Right-of-way permit. Covers the driveway connection where your lot meets a county road.
- Well authorization. The Comal Trinity Groundwater Conservation District requires written authorization before any well is drilled, including a household well, and that authorization also serves as the well’s registration.
Septic design and the well usually set the pace for everything else, which is why we start them early. Our guide to the well and septic timeline on a new build explains how those steps stack up before the slab.
Lots near the shoreline and Corps of Engineers land
The lake itself is a federal flood control project. The U.S. Army Corps of Engineers completed Canyon Lake on the Guadalupe River in 1964, built in partnership with the Guadalupe-Blanco River Authority, and the federal government still owns the dam, the reservoir, and the flood storage space above the normal lake level.
That matters for anyone with a lot close to the water. The Corps describes its flowage easement lands as private lands generally below the 948-foot elevation contour. On that easement, no home or other structure for human habitation is allowed, and the Corps will not allow septic tanks below 948 feet. Most other structures on easement land need the Corps’ written consent before any work starts.
So on a lakeside lot, the first question is where that contour runs. We work from the property survey and the plat to find it, then set the location of the house, the septic field, and the well above it. A lot can have beautiful water views and still leave less buildable ground than the listing suggested, and it is far better to learn that before you fall in love with a floor plan.
Steep ground and limestone
Comal County sits on the Balcones Escarpment, where the land climbs from the prairie into the Hill Country, and most of the county above the escarpment ranges from about 750 to 1,500 feet in elevation. Many homesites around the lake are on hillsides, with limestone close to the surface and live oak and Ashe juniper covering the slopes.
Slope and rock change the foundation design, the driveway grade, and how storm water moves around the house. Cutting into limestone costs more than digging soil, and a long, steep drive takes real money to build and maintain. Our construction staking and layout work sets the house and the driveway on the ground before excavation, so you can stand where the kitchen will be and see the view before anything is cut.
What a custom home costs to build
The question we hear most is cost. A useful starting point is the National Association of Home Builders benchmark: the median contractor-built custom home in the United States cost about $166 per square foot to build in 2024, not counting land. At that median, the house alone on a 2,000 square foot plan comes to roughly $332,000 before any site work.
Around the lake, site work is where budgets drift. An engineered septic system, a well, rock excavation on a slope, a long driveway, and bringing in power can add a large amount on top of the house itself. Finishes and details move the number too. We price from your actual lot and your actual plan, so the first budget you see includes the site costs a low quote usually leaves out.
Homes and structures we build
Iron C Construction handles the full range of residential work for lake area homeowners, all with the same local team:
- New custom homes, from the first design conversation through the final walkthrough.
- Build on your lot for owners who already hold a homesite or acreage.
- Home additions that add bedrooms or living space to an existing house.
- Whole-home remodels and renovations for older lake houses.
- Custom barndominiums with a steel or post-frame shell and a fully finished interior.
- Garages, shops, and accessory structures for boats, equipment, and storage.
- Guest houses and casitas for visiting family or a home office.
How we run a build from the first site visit
Every project moves through the same steps: site review and budget, design and selections, permits, construction, and a final walkthrough. You always know which stage you are in, what decisions are coming up, and who to call.
Robert Castro stays involved in the projects we take on, and Arthur Leyva, our Construction Coordinator, brings more than 20 years of field experience to keeping the daily work organized. When the ground turns up something the plans did not expect, like rock where the design assumed soil, we show you what we found, explain the options and the cost, and let you decide before work moves on. That is the standard we hold ourselves to: honest pricing, clear schedules, and one accountable team from start to finish.
Contact us about a Canyon Lake custom home
Whether you own a hillside lot above the water or acreage farther back from the lake, Iron C Construction can help you plan and build a home that fits it. If your plans include a shop, office, or storefront, our construction company in Canyon Lake handles commercial projects as well. Tell us about your land and what you have in mind, and we will walk you through budget, design, and timeline. Contact us to request a consultation, and read our reviews to see what homeowners say about working with our team.
