Zoning for Data Centers: By-Right, Special Use and Rezoning

Every data center site falls into one of three situations. The use is permitted outright in the current district, it is allowed only with a discretionary permit, or it is not allowed at all and the land must be rezoned. Each path has a different decision-maker, a different standard of review and a different level of risk.

Timelines vary widely by jurisdiction, by how complete the application is and by how much public interest the project draws. The ranking above holds almost everywhere, though: administrative approvals move faster and more predictably than anything that needs a vote.

A by-right site is one where the zoning ordinance lists a data center, or a use the zoning administrator agrees covers a data center, as permitted in that district. The project still needs site plan approval, building permits and other technical reviews, but no board gets to weigh whether the use belongs there. If the plans meet the code, staff must approve them.

By-right does not mean unrestricted. Industrial districts set height limits, setbacks, lot coverage, parking, landscaping and often performance standards for noise and lighting. Some jurisdictions have added data-center-specific standards that apply even in districts where the use is permitted, such as larger setbacks from homes, required sound studies or limits on generator testing hours. Those standards can reduce the buildable footprint, which is why we check them against gross vs. buildable acreage before calling a site by-right.

Many zoning ordinances were written before large data centers were common. They list warehouses, manufacturing, utilities and offices, but not data centers. In that case the zoning administrator makes a use interpretation, and the answer can go several ways:

• Treated as a warehouse, distribution or light industrial use, often permitted in industrial districts.
• Treated as a public utility or utility facility, which may carry its own approval process.
• Treated as an unlisted use, which some codes prohibit until the ordinance is amended.
• Sent to a text amendment, where the jurisdiction writes a new data center definition and standards before any site can be approved.

An interpretation can usually be appealed to a board of zoning appeals, and it can be changed later by ordinance. When a jurisdiction is drafting data center standards, applications already filed may or may not be protected, depending on state vesting law. That is a question for local land use counsel, not an assumption.

A special use permit (also called a conditional use permit, special exception or use on review) means the use is allowed in the district only after a hearing body finds that it meets set criteria. Those criteria typically ask whether the use is compatible with neighboring properties, consistent with the comprehensive plan, adequately served by roads and utilities, and not harmful to public health, safety and welfare.

This is a quasi-judicial decision in many states. The board must decide based on evidence in the record, which gives applicants a clearer standard than a rezoning. It also means the record matters: sound studies, traffic analysis, visual simulations and utility service letters all carry weight. Approvals usually come with conditions, and those conditions run with the land. Common ones include:

• Minimum setbacks or buffers from residential property lines.
• Maximum sound levels at the property line, often lower at night.
• Generator testing limited to daytime weekday hours.
• Landscaped berms, opaque screening or architectural treatment of facades.
• Building height caps below what the base district allows.
• Phasing, road improvements or limits on construction traffic routes.

If the current district does not allow a data center, the owner or developer asks the governing body to change the zoning map. In most states rezoning is a legislative act. The elected board has broad discretion and can deny a request even when the application is technically complete. The planning commission usually holds a hearing and makes a recommendation first, then the governing body holds its own hearing and votes.

Many jurisdictions allow or encourage conditional rezoning, where the applicant offers binding conditions (proffers, in some states) or a development agreement as part of the request. Others use planned development districts with a master plan that fixes building locations, heights and buffers. These tools can make a rezoning more acceptable to officials, but they lock in a layout early, before engineering is final. Agricultural land is the most common rezoning case, and it often draws the most public attention, which our guide to community engagement for data centers covers.

Zoning is not the only land use document that matters. Check each of these:

• Comprehensive plan and future land use map. A rezoning that matches the planned future use has a much easier path than one that contradicts it. Some states require consistency.
• Overlay districts. Airport, historic, corridor, watershed or technology overlays can add standards or, in some cases, streamline approval.
• Annexation. A site in an unincorporated area may need to annex into a city to get water or sewer service, which brings it under city zoning.
• Airport zoning and FAA review, which can cap building and stack heights; see FAA airspace and height limits.
• Private restrictions. Recorded covenants, deed restrictions or industrial park rules can prohibit uses that zoning allows.

1. 01Confirm the current zoning district from the official zoning map, not a third-party parcel viewer.
2. 02Read the use table and definitions to see whether data centers, or a likely equivalent use, are listed.
3. 03Read the district’s dimensional standards and any data-center-specific or performance standards.
4. 04Check the comprehensive plan designation and any overlays.
5. 05Look at recent decisions on similar projects in the jurisdiction, including denials and conditions imposed.
6. 06Ask the zoning administrator for a written interpretation or zoning verification letter.
7. 07Check whether any moratorium, text amendment or plan update affecting data centers is under way.

When we screen a site, zoning status is one of the first filters, because it sets the realistic entitlement timeline. That timeline then has to line up with power delivery and the rest of the data center permitting process.