Forty-six thousand square feet across two buildings is the size of the second phase described for a Pasadena business park that fronts Beltway 8, following a first phase of 85,500 square feet. Buildings like that are the working middle of Texas industrial real estate: small enough to divide among several tenants, big enough to need real dock doors, real truck access and real utilities. We build the slab, paving, drainage and underground package for flex and light industrial projects across the state.
The buyer on these jobs is usually a developer or a general contractor working to a tight pro forma. Every line of site cost is weighed against rent per square foot, and a building that sits on a poorly prepared pad will lose tenants, not just money. We aim for the plain, well-built floor and court that make leasing easy, with the flexibility to cut doors and add utilities later.
The details below describe how we approach pads, paving, utilities and cost on that scale of project.
The pieces of a multi-tenant site
A typical flex site includes a graded pad, a 5 to 6 inch reinforced slab with sawcut joints, rear or side dock aprons, a few drive-in ramps, parking, a fire lane, detention and the water, sewer and conduit that serve each bay. We keep the sequence simple: earthwork and underground first, floors and aprons next, then parking and sidewalks, and finally striping and finish items. The sidewalks and flatwork crews we coordinate and curb and gutter crews finish the perimeter once the building is closed in.
Because tenants arrive later and have different needs, we recommend leaving sleeves and stub-outs for future floor drains, trench drains and electrical feeds. A slab that has been sawcut and patched many times does not look or perform like one built right at the start.
Shells that flex projects use
Most flex buildings are tilt-up or pre-engineered metal. The Pasadena park above specified tilt-wall buildings, and that choice puts the slab to work as the casting bed, which makes floor quality part of the wall quality. Pre-engineered steel buildings put the emphasis on foundations and anchor bolt placement, which we handle through pre-engineered metal building foundation work. We also build the larger relative, the warehouse, where the same slab and dock details are scaled up.
Some flex projects add office build-out, showroom space or light manufacturing, which brings heavier floor loads, process drains and trenches. We discuss tenant types with the developer early and design the slab thickness and joint layout around the most demanding likely user, not just the average one.
Small-bay demand across Texas metros
Houston-area industrial vacancy was reported at 6.8 percent in the second quarter of 2026, a number that supports steady demand for new space but also means tenants have choices. In Katy, a wind turbine maker leased a 131,300 square foot warehouse and office facility at Enterprise Park at Twinwood, a 17-acre property about a mile south of Interstate 10, which shows light industrial buildings taking users with mixed office and warehouse needs. In Pearland, a metalworking company broke ground on a 75,000 square foot facility on 15 acres in the Lower Kirby district.
These examples share a pattern: parcels of 15 to 20 acres, buildings of 75,000 to 130,000 square feet, and sites that depend on fast permitting and efficient site work. They suit commercial developers who want predictable site packages and low risk of change orders.
Getting the pad right the first time
For small and medium parcels we begin with a pad plan: proof roll, scarify, moisture condition, treat if needed, place engineered fill and test. Houston's soil is described as flat, low-permeability clay-silt prairie, and flooding is a recurring problem, so drainage design and finished floor elevation are discussed at the start. The fine grading crews we coordinate set the subgrade to tolerance so the slab thickness is consistent across the building and the concrete yield matches the estimate.
On smaller sites the staging area is tight, so we plan truck routes, pump positions and material laydown in advance. A pour that blocks the only entrance for six hours is not acceptable to neighboring tenants or to the owner's schedule.
Keeping the budget predictable
The biggest variables on flex work are soil treatment, detention size, and utility extension distance. A parcel next to an existing water main and storm outfall is cheap to serve; a parcel needing a long extension can cost as much for the underground package as for the slab. We ask for utility availability letters and the drainage study early, and we price alternates for options like thicker aprons or additional dock pits.
Concrete quantities are straightforward, but unit cost depends on ready-mix delivery, the number of pours and pump needs. Using a consistent mix design across the parking and flatwork can simplify ordering and testing.
Phasing for early tenant occupancy
Developers want a first bay open as soon as possible, so we often split the site into zones. The building pad and its dock apron come first, then the parking directly in front, while later zones continue under construction. That keeps the leasing team showing a finished, paved building instead of a mud lot. We schedule finishing and curing so that tenant improvement crews can start inside the shell while exterior concrete is still being placed.
Weather needs a realistic allowance. Gulf Coast rain days and summer heat both interrupt pours, and we include contingency in the sequence instead of promising a date that assumes perfect conditions. On sites that need to hold a fixed delivery date, we add a second finishing crew and a backup concrete source so a late truck does not turn into a lost day.
Price the site package before the shell
Send the site plan and utility letters and we will return a slab, paving and underground estimate with alternates for tenant flexibility.
Common Questions
Is flex space built differently from a warehouse?
The structure is often similar, but the finishes and utilities differ. Flex buildings usually have more doors, more office space and a wider variety of tenants, so floor drains, sleeves and electrical stubs need more planning. The concrete scope is similar to a warehouse, with extra attention to future tenant changes.
How thick should the slab be?
The structural engineer decides. Common flex slabs are in the 5 to 6 inch range with reinforcing, thicker at dock aprons and heavy equipment zones. We build what the drawings call for and flag any area where a tenant plan might exceed the design.
Can you work on a multi-phase park?
Yes. We build the pads for the first phase and utilities while leaving stubs and easements for later phases, and we coordinate drainage so that later construction does not damage completed buildings.
Do you handle tenant-requested changes after the slab is poured?
We can saw, core and patch for added drains or doors, and we will tell you what each change costs in surface appearance and in cure time. Planning for likely tenant needs before the pour is cheaper, so we ask your leasing team which users they expect.
What should we budget for detention?
It varies widely by city criteria and soils. Some parcels need a modest basin, others need a large one. Ask your civil engineer for the required volume early, and we can price excavation and outlet structures with it.