What Utilities and Permits Does a New Drive-Thru Coffee Site Need?

Why do utilities and permits decide the opening date on a small pad?

Because the building is the part that repeats. A prototype coffee building changes little from site to site. The city, the utility and the parcel change every time, and each one answers on its own schedule.

Restaurant chains report the same pressure. In February 2024, Chipotle's chief financial officer said projects that once took about 15 to 16 months were taking about 21 to 22 months, and he named permitting, inspection and utility installation delays among the causes (Restaurant Dive).

What does a will-serve letter tell you, and what does it not?

It depends on the city, so read what the letter actually commits. In Austin, a service availability letter, also called a will-serve letter, identifies the water and wastewater provider for a tract. Capacity for new development is handled in a separate process, the service extension request, where one applies.

In Houston, a wastewater capacity reservation letter determines whether adequate water and wastewater service is available, identifies the connection point and says whether impact fees are due. Unpaid, it is valid for six months, which matters when a lease negotiation drags.

Before the LOI goes hard, ask the provider:

• Is there capacity for this use at this pad?
• Where is the connection point for water and for sewer?
• Is a main extension needed, and who builds it?
• How long does the letter or reservation last?

How are the water tap and meter sized for a coffee building?

From the building's plumbing fixtures and equipment. Corpus Christi's water tap and meter sizing worksheet is an inventory of the project's plumbing fixtures, each given a value for typical water use. The total, plus flow from irrigation or special equipment, sets the meter size, using 2021 International Plumbing Code fixture values.

Texas law recognizes both the International Plumbing Code and the Uniform Plumbing Code, and lets a city amend the code it adopts (Occupations Code §1301.255). Check which code and amendments the city uses before the plumbing plan is drawn.

Ask who makes the tap. The same Corpus Christi form lets the applicant choose a full tap by the city or a tap by an approved utility contractor.

Does a drive-thru coffee shop need a grease interceptor?

It depends on the city and on what the shop prepares. In Austin, every commercial and institutional food preparation business must have a grease interceptor approved by Austin Water (Austin Water pretreatment requirements).

A business that provides drinks only, serves only prepackaged food or cuts fruit may ask to operate without one, by filing a variance request with its plan review submission.

The size comes from the city, not the catalog. Austin Water's grease trap sizing and design criteria say hydromechanical interceptors generally suit low-grease businesses such as small sandwich shops, coffee shops and bakeries that use disposable flatware and no automatic dishwasher.

The same criteria require at least a 500-gallon interceptor where a food business uses a dishwasher. They also warn not to buy a grease trap or interceptor before building plan approval and the approval letter that sets its size and design.

Other Texas cities run their own programs. The San Antonio Water System's fats, oils and grease ordinance applies to all food service and food processing establishments in San Antonio's city limits and extraterritorial jurisdiction.

What backflow protection does beverage equipment need?

Carbonated drinks raise the bar. Austin's plumbing code requires a reduced-pressure backflow assembly for post-mix carbonators, and no copper piping may be installed downstream of it, because carbonated water dissolves copper (Austin Water).

Austin also requires mechanical backflow assemblies to be tested when they are installed, and at least once a year when they protect against a health hazard. Show the assembly and its test access on the plans.

What does site civil cover on a quarter-acre drive-thru pad?

Everything outside the building. On a small pad that usually means:

• Grading and drainage, including whether the city's drainage rules trigger detention.
• The water, sewer and any fire lines from the mains to the building.
• Driveway access. Under TxDOT's Access Management Manual, a driveway onto a state highway needs a permit on Form 1058, applied for by the property owner or an authorized representative through the local district office.
• The drive-thru lane and its stacking, checked against the city's rules.

Check the use before the lease. Zoning that allows a coffee shop may not allow a drive-thru. In Richardson, any business with drive-thru service needs a special use permit. In December 2024 the city council denied one for a drive-thru-only coffee shop, despite a plan commission recommendation (Community Impact).

A repeat prototype can carry one plan set from city to city, but each site still needs its own civil design, and its own utility plans where the city asks for them. That is the working model behind drive-thru and multi-site programs for chains and franchises opening many locations.

Is your next drive-thru coffee parcel ready for the lease to go hard?

Answer each question yes or no. Any no is an open item to close, or to price into the schedule, before the lease goes hard.

1. Is drive-thru use allowed by right, or does it need a conditional or special use permit?
2. Do you know the water and sewer provider for the pad?
3. Has the provider confirmed capacity and a connection point, and do you know how long that letter lasts?
4. Does sewer reach the pad by gravity, without an extension?
5. Do you know whether the city requires a grease interceptor for your menu, and who sets its size?
6. Do you know what backflow assembly your beverage equipment needs?
7. If the pad fronts a state highway, is the TxDOT driveway permit in the schedule?

Questions to bring to your engineer and site team:

• Which of these clocks starts last in this city, and can we start it this week?
• What did the city ask for on the last drive-thru it approved?
• What changes on the grease and sewer side if the menu adds food prep?

Limits. This is general education based on Texas law and on examples from specific Texas cities. Each city and utility applies its own adopted codes and amendments, so confirm every requirement with the agencies for your site. It is not engineering advice for a specific project.

Frequently asked questions

Is a grease trap the same as a grease interceptor?

Austin's rules use both words for the same requirement: its criteria refer to "a grease trap or interceptor". They set separate rules for gravity interceptors, which must have two compartments, and hydromechanical interceptors, which must meet the ASME A112.14.3 standard.

How big does a grease interceptor need to be for a coffee shop?

The city decides. In Austin, the approval letter issued during building plan approval specifies the size, no grease trap smaller than 100 gallons is approved, and a food business with a dishwasher needs at least 500 gallons.

I'm the development director for a coffee brand entering Texas, and our LOI is on a pad with no sewer main along its frontage. What should we ask before the lease goes hard?

Ask who provides sewer, whether a main extension or a private lift station is needed, who designs and builds it, and what the provider's capacity letter commits and for how long. In Austin, extending infrastructure to serve a property is its own service extension request.

I'm a franchisee opening a drive-thru beverage stand in Austin that will serve carbonated drinks. What backflow protection will the plumbing inspector expect?

Austin requires a reduced-pressure backflow assembly for post-mix carbonators, no copper piping downstream of it, and a test when it is installed. In another city, check the adopted plumbing code and its amendments with the plumbing inspector.

Does a drive-thru coffee shop need a TxDOT permit?

For the driveway, only when it connects to a state highway. A water or sewer line in state right of way needs its own TxDOT utility permit (43 TAC §21.40). Where a local agency has been granted driveway permitting authority on state highways, TxDOT's manual says drainage impacts on the highway still need TxDOT approval before local approval.

Related resources

• FOG Pretreatment Programs for Texas Restaurants and Food Service Facilities
• What a Utility Feasibility Study Actually Tells You, and When to Get One
• How to Evaluate Wastewater Utility Options Before You Close on Land (Connect, Build, or Wait)
• TxDOT Utility Installation Review: How Water and Sewer Lines Get Permitted in State Right of Way

Lining Up Your Next Drive-Thru Coffee Sites?

Send us your next five LOI parcels and we will quote a fixed-fee read of what each city and utility will ask, before the leases go hard. The read is credited in full if you then have us engineer two or three of those sites.

We specialize in:

• Drive-thru and multi-site site civil design
• Water and sewer service design
• Grease interceptor and sanitary sewer sizing
• Utility coordination and service applications
• TxDOT access driveway permit packages
• Permit submittals and city comment responses

Modern Engineering Solutions, McKinney, Texas. Contact: (214) 833-6748 or mod-eng.com