Flex and Light Industrial Building Sites in Casper, Wyoming

Tenants rarely want what the developer drew. A flex building gets leased in bays of 2,000 to 5,000 square feet, and the first tenant wants a roll-up door and a floor drain, the second wants a showroom, the third wants a welding shop. The concrete and site work has to leave room for all three, which is why we think about the slab, the utility stubs and the parking before the walls go up.

Casper has several kinds of ground for this. Former tank farm land on the refinery reuse property is now a business center. Bar Nunn was laid out on old airfield runways. Mills has been growing, and its public works and building departments sit in town. Each setting comes with a different soil, a different utility availability and a different level of review, and the pricing follows.

Here is how we approach a flex or light industrial project in Natrona County, what the buildings need from us and what tends to push costs.

Business-center ground, former airfield, growing towns

Part of the old refinery property at Platte River Commons is now the Salt Creek Heights Business Center on the former tank farm. The refinery there opened in 1895 and ran until the last barrel was refined in 1991, and the site is still recovering from contamination. A flex building on reuse ground starts with environmental records, and the excavation plan follows what those records say. We do not dig first and ask later.

In Bar Nunn, the old runways of Wardwell Field now form the street pattern. The town grew about 35 percent, from 2,213 residents in 2010 to 2,981 in 2020, and it sits at 5,285 feet. Old airfield pavement and base can be an asset or a problem under a new lot. We probe it, decide what stays and what is removed, and plan the grading to match. Whatever stays, the new lot needs a clean, compacted subgrade and a drainage plan that works for the whole parcel, not only the pad.

What goes in a flex building

A flex building might house contractor shops, equipment dealers, light assembly, labs, small distribution and office fronts. A plain storage warehouse uses floor and dock concrete heavily; a flex building spreads the concrete across smaller bays, with a mix of overhead doors and walk-in entries. The slab must work for both.

Close neighbors in the market are self-storage facilities, where the slab is simpler and the unit count matters, and retail centers, where parking and curb work dominate. Flex falls between them: a floor strong enough for a forklift, a lot that works for customers and trucks, and utilities that handle a variety of tenants. We keep a record of door sizes and drain needs for every bay so a change of tenant does not mean a jackhammer.

Slab, lot and utilities for a multi-tenant building

Floor slabs are normally thicker than an office slab and are jointed so a tenant can cut a trench later without damaging the structure. We often leave sleeves for plumbing and electrical through the footing line before the slab is placed, set drain locations at likely bay lines and pour a slab with a broom or light trowel finish depending on use. Floor drains and trench drains are cast at the right slope.

The lot is a combined job. Parking lot concrete takes the customer cars, a service apron takes the trucks, and curb and sidewalk tie them to the street. Under all of it, sanitary sewer installation and water services stub into each bay on separate taps so a tenant can be metered or closed without affecting the others.

City and town departments you will deal with

In the city, commercial permits often require a life-safety plan, engineered building and site plan drawings and Planning and Zoning approval. Plan review covers structural calculations and engineering reports, and a permit lasts 180 days. For a spec building, that clock matters more than for an owner-occupied plant, because the tenant mix can change after permit.

Mills lists Building and Inspections, Planning and Zoning, and Public Works with a water treatment facility, so a project there deals with a town staff rather than the city. Wyoming leaves code adoption to each city and county, so we ask which edition the jurisdiction enforces. The city uses the 2024 International Codes, but a neighboring town or the county may be on its own schedule.

Where a flex building budget lands

On multi-tenant buildings, the cost is shaped by what is built now and what is left for the tenant. Developers who stub utilities, rough-in drains and pour a standard slab keep their cost down and their flexibility up, then let tenants pay for specialized floors. We help owners decide which items go in the base building.

Lot size, soil and storm drainage dominate site cost. A small lot with poor soil may need more fill and a detention area, while a larger lot with good drainage costs less per square foot. Land development infrastructure, including streets and utility mains for a larger park, adds quickly. Commercial developers usually ask us to phase the work so the first building can open while later pads are still in design.

Share the lot and the tenant plan

Send us the lot, the building footprint and the tenant mix you expect. We will return a phased plan for dirt, utilities and concrete with each piece priced on its own.

Questions Owners Ask

Should a flex building have a reinforced slab?

Usually yes, in a way the engineer specifies. Reinforcement controls crack width and gives the floor a margin for forklifts and equipment. We follow the drawing for mesh, fibers or bar, and we saw-cut joints soon enough that random cracks do not form.

How do you deal with old airfield pavement under a new lot?

We probe and test it. Sometimes the old base is a sound platform and we build over it. Sometimes it is broken or contaminated and has to come out. Either way, we document what we find and share it with the engineer before grading.

Can we phase a flex park by building?

Yes. We often run the main utilities, the storm system and the roadway in the first phase, then build each pad as tenants sign. We protect finished pavement from later traffic and leave stub-outs capped and marked.

Do we need floor drains in every bay?

Not always. If the tenant might wash vehicles, process liquids or store chemicals, drains and traps may be required by code. We set sleeves and rough locations in the base building and finish the drains when the tenant use is known.

What does a tank farm reuse parcel mean for foundations?

It means we check environmental records, soil borings and any restrictions on excavation before we design the footing depth or the utility trench. We plan for handling and disposal of any impacted soil as a separate item, so the base bid stays clear.

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