Nobody photographs the pipes, but a warehouse stops working without them. Water for the sprinklers, sanitary sewer for the restrooms, storm drains and detention for the truck court, electric service for the lights and docks, gas for the heaters, and conduit for data: those systems decide whether a building can be occupied. They also decide a good part of the budget and schedule, because the work happens before a single wall goes up and because the utility providers keep their own calendars.
Our site utilities package covers everything from the property line to the building and everything below grade within it. We run it as a single scope so that trenches are opened once, inspections are scheduled together and the slab is poured on a site that has already been cleared for it. Developers get a firm number for the least visible part of the job, and operators get a site that drains properly after the first hard rain.
The paragraphs below explain how we handle each system in Oklahoma, where river flooding, big storms and uneven utility capacity all affect the plan.
Power, water and drainage across Oklahoma
The state's utilities vary a great deal from place to place. At MidAmerica Industrial Park in Pryor, a January 2021 article describes custom electricity provided by the Grand River Dam Authority, a reminder that industrial power at a large campus is often arranged with a specific provider and not taken off a standard tariff. In the Panhandle, water supply can be the main constraint. Elsewhere, sewer capacity or road frontage is the limit. We ask for the will-serve letters before a client commits to land.
The Oklahoma Water Resources Board refers on its home page to a $24 billion water infrastructure need, which tells you something about the age and capacity of the networks a new warehouse may connect to. We do not assume the main in the street is large enough. We test flow, calculate sprinkler demand and plan for a fire pump or storage tank where the system falls short.
What the package covers
Below ground, the package includes sanitary sewer lines and manholes, domestic and fire water mains with backflow preventers and hydrants, storm drains, inlets and detention structures, and conduit duct banks for power and communications. At grade, it covers mass grading, subgrade stabilisation, building pads, curb and gutter, drive entrances and erosion control. We also provide for gas lines, site lighting, transformer pads and, if required, utility relocations.
The building pad is part of this scope. A warehouse slab is only as good as the ground below it, so we compact, proof-roll and, if needed, over-excavate to engineered fill. Pavement beyond the pad is covered under our truck court and trailer yard work. When the building itself is a speculative shell, we place utilities so tenants can be added without cutting new trenches.
Flood, levee and creek issues
Oklahoma has real flood history, and utilities have to be designed with it in mind. The National Weather Service reports that the Memorial Day flood of May 26 and 27, 1984 killed 14 people and injured 288 in Tulsa, with $180 million in damages, of which Mingo Creek alone accounted for $125 million. The state House reported in May 2024 that the Army Corps of Engineers ranks the river levee system in Tulsa County in the top 5 percent most at risk for failure. In Muskogee, river flooding in May 2019 rose more than 42 feet, the highest since the 1943 flood.
For a warehouse, those facts translate to floodplain mapping, finished floor elevations, detention design and the placement of electrical gear. We check the flood maps before design, set the floor above the required elevation, keep switchgear and generators above flood level and design detention so the site does not worsen runoff downstream. Where a parcel sits behind a levee, we ask what the levee protects and what the insurer will require.
Sequencing around utility providers
Utility work rarely follows our calendar. The electric provider may need months to design and install a transformer, the water department may require its own inspection and tap schedule, and the gas company has its own crews. We open each of those conversations as soon as the client commits, and we put the response dates on the project schedule so that delays are visible early.
On site, the sequence is: clear, grade, install deep utilities, build the pad, pour footings and slab, then connect services before the building is enclosed. We schedule inspections so that trenches are tested and approved before backfill. In Oklahoma, wet spring weather often stops excavation, so we try to complete the deepest work in the drier months and keep stormwater controls in place the rest of the year.
Permits and approvals
Site work needs several permits: grading, stormwater, utility connections, sometimes floodplain development and driveway access from the state or county. The building permit is separate. The state sets minimum codes through the Uniform Building Code Commission, and cities adopt and enforce their own editions and amendments. Cities such as Oklahoma City, Tulsa, Edmond and Norman list the editions they have adopted, so we confirm the version and any amendments before design.
Plumbing and electrical work require licensed trades even though general contractors need no state licence. We use properly licensed contractors for those parts and keep documentation for each inspection. Our ESFR fire protection coordination work depends on the water main and tank design, so we involve the fire protection designer at the start of the utility plan.
Where site utility money goes
Rock, groundwater and poor soils can transform a budget, which is why we ask for a geotechnical report before pricing. Utility lengths matter too: a site with services at the street costs much less than one that needs a half-mile main extension. Detention requirements, off-site road improvements and utility impact fees vary by city and can run to large sums. We list them clearly as allowances so the owner knows which are fixed and which depend on the city.
Developers who plan several buildings should size utilities for the full build-out. Installing a larger pipe or duct bank during the first phase usually costs a small fraction of digging it up later. This matters for owners of warehouses who might add a second building, and for the developers and REITs who control the master plan.
Send us the parcel before you close on it
Give us the survey, the zoning letter and any utility will-serve letters you have. We will return a utility and drainage outline, a list of the questions that need answers from the city and the utility providers, and a cost range for everything outside the building line.
Common Questions
What should I check before buying a site?
Get utility will-serve letters, a geotechnical report, a flood map review and a zoning confirmation. Ask whether water pressure supports the sprinkler design and whether sewer capacity exists. We can review these documents for you before you close, which often reveals costs the seller did not mention.
How do you handle a site in a floodplain?
We start with the mapped flood elevation and the local floodplain rules. The floor is set above the required level, electrical gear is raised and detention is designed so downstream properties are not harmed. Some sites need a study or a permit. Others are better avoided, and we will say so.
Who pays for utility extensions?
It depends on the city and the provider. Some extensions are paid by the developer, some are shared, and some are reimbursed over time as other properties connect. We get the cost rules in writing early and include them as allowances in the budget.
Can the utilities be built before the building permit is issued?
Often yes, with a site development permit. This lets us start earlier and shorten the schedule. The limit is that the underground design must match the final building layout, so we need a stable plan before digging.
How long does power take?
It varies by provider and size of service. A large service may require a new transformer or line extension, and lead times for equipment can be many months. We make the request on day one and tell you the expected date in the first schedule.