Concrete Foundations in Carrollton, TX

Carrollton permits, fees and the once-a-day inspection window

Permits and inspections in Carrollton run through the CityServe Portal, and the Building Inspection office works out of City Hall on East Jackson Road. Ordinances 4265 and 4290, effective September 1, 2025, put the 2024 I-Codes, including the IRC, in force. The 2021 cycle came before that, which means a plan drawn a few years back could cite old sections. Before a concrete foundation in Carrollton goes to the counter, have your designer confirm the edition on the sheets.

Inspections come once a day. Call it in before 7:00 a.m. and the visit is that day, or after 7:00 a.m. and it lands on the next business day. Nobody inspects on Friday afternoon, which sends a Friday request after 7:00 a.m. to Monday. That sets the rhythm of pour week, and our steel and footing checks follow it. No pour happens ahead of an inspection your permit lists.

Here is the fee schedule. Building and miscellaneous construction is $50 and that line names residential accessory structures. The non-refundable application processing fee is $125, but for a permit costing less than $125 the permit fee is charged as the application fee. A re-inspection costs $50. Starting before the permit draws an investigation fee equal to the permit fee. General contractor registration with the city is free. Permits run out no later than three years after issue, with written extensions of up to 180 days each, and a copy of the permit and the construction documents has to stay on site. Our permit guide lines Carrollton up with its neighbors.

What a concrete foundation in Carrollton sits on: Branyon, Houston Black and Trinity clay

Inside the 2020 Census boundary, NRCS sampled 30 points. Of the 29 that landed on dry ground, 20 (69%) rate "Very limited" for dwellings on concrete slab. Seventeen (59%) have linear extensibility of 9% or more, which NRCS calls very high shrink-swell. Leading the list of map units are Trinity-Urban land complex (13% of points, occasionally flooded), Branyon clay (13%, linear extensibility 9.9%), Houston Black clay (10%, 12%) and Heiden clay (7%, 12.1%). Each of the four rates "Very limited" for slabs.

When dry, Branyon clay cracks 1 to 3 inches wide and 20 inches deep or more, according to NRCS, and the cracks stay open 90 to 150 days in most years. Dallas County Master Gardeners, an AgriLife Extension-affiliated program, name drought, flooding and poor drainage among the causes of slab movement. Wet and dry swings are part of Carrollton's dirt.

Clay isn't everywhere, though. Silstid loamy fine sand covers 7% of the sample points at 1.5% linear extensibility and rates "Not limited". Two Carrollton lots can need different footings, so we price each concrete foundation in Carrollton from your engineer's plan, not from a zip code. For foundations on expansive soil, the 2024 IRC points to IBC Section 1808.6, and it lets the building official ask for a soil test. Our expansive clay guide walks through the numbers.

What It Costs

Foundation pricing in Carrollton is per square foot, from your plan.

Permit and engineering fees come on top. A free written estimate follows once we have the plan or have seen the lot.

Three counties, one floodway: the flood map and 811 before the footing trench

Dallas, Denton and Collin counties all hold part of Carrollton, and its ground runs from dry upland to river bottom. FEMA's map, checked at those same 30 points, puts 60% in Zone X minimal hazard, 10% in an AE floodway, 7% in other AE, 7% in the 0.2% annual chance Zone X, 3% in Zone X protected by a levee and 3% in Zone A, while the other 10% returned no answer. USGS operates a stream gauge on the Elm Fork of the Trinity River near Carrollton. A sample doesn't answer for a single parcel, so look up your own address on FEMA's flood map before the design is final.

The city has a Stormwater and Flood Protection chapter (Chapter 174) and a Tree Preservation chapter (Chapter 155). If a protected tree stands where the addition goes, ask Building Inspection early. Tree mitigation costs $225 per caliper inch of protected tree not otherwise mitigated.

Digging footings counts as excavation, which Texas law defines as moving soil 16 inches or more with powered equipment. Each excavating party needs its own Texas811 ticket, subcontractors included. The locate costs nothing, but your own irrigation line is not marked for free. We call in our own work, and we tell you when another trade has to.

Garage, shed and workshop slabs: Carrollton's 120 sq ft line

The model code exempts sheds up to 200 sq ft, but Carrollton lowers the line to 120 sq ft. Over 120 sq ft, a one-story detached accessory structure needs a permit. The city adds that the code still applies and must be followed even where a permit is waived.

Each lot in single-family zoning may have one accessory building plus one detached garage. No accessory building can sit between the house facade and a public street, and a building over 600 sq ft has to match the main house's materials and style. Maximum building coverage in most single-family districts is 45% according to the district tables, with one column at 55%. At least 10% of a lot must stay landscaped, with 50% of that in the front half of the lot and 30% in the front yard, and artificial turf is left out of the count.

As for the slab of a concrete foundation in Carrollton, the IRC sets 3 1/2 inches as the minimum thickness of a slab-on-ground floor unless the design follows ACI 332, and the steel must sit supported between the center and upper third of the slab while the concrete is placed. The 2024 edition puts a 6-mil polyethylene vapor retarder under heated space but leaves it out under a garage or other unheated accessory building. Our Carrollton patio page covers the covered-patio permits.

Adding onto a 1988 house: slab ties, repairs and the engineer rule

By the Census Bureau's 2020 to 2024 estimates, the median Carrollton home dates to 1988, across 54,365 housing units, with a median owner-occupied value of $381,000. Units from the 1980s make up the largest decade at 15,462 (28%), and 26% of all units predate 1980. According to the Handbook of Texas, the population rose 193 percent to 40,595 between 1970 and 1980, and almost three-quarters of the city's year-round housing units were built during that decade. An addition here may mean a new concrete foundation in Carrollton meeting a slab that has had decades to move.

Has that slab cracked or settled? Per the city, every foundation repair needs a permit regardless of valuation, and a Professional Engineer must design it. Work through the old slab's problems on the engineer's schedule, then tie in the new work. When the house sits on a post-tensioned slab, the 2024 IRC points its design to PTI DC10.5, and no one should drill into it before a plan shows where the tendons run.

The ground also decides how the new footing meets the old. A garage slab beside a driveway runs into the street approach rules in a separate way, and our Carrollton driveway page covers that. For the work on the house itself, read the full concrete foundations service page and our Carrollton concrete contractor page.

Pricing a Carrollton foundation, the paper trail and what to send us

A concrete foundation in Carrollton for an addition, garage or accessory building is an engineered slab-on-grade at $8 to $14 per sq ft, quoted from the plan. No whole-project number is published. Beam depth, steel, truck access and how the new slab ties into an old one all move the price. Permit and engineering fees come on top. The estimate is free and written.

Texas law gives you protection on paper. To fix a lien on a homestead, Property Code 53.254 requires a signed written contract before work starts, and both spouses sign if you are married. A contractor holding a residential homestead contract over $5,000 has to keep the funds in a construction account under Property Code 162.006.

Looking for a concrete foundation in Carrollton, TX? Send your plan, survey or a sketch through the contact page, or call 469-972-8639. The same city rules apply from Crosby Road to Dickerson Parkway and out along Belt Line Road, and we price to them.