The major permit categories
Construction permits authorize specific kinds of work. A single project typically involves multiple permits — sometimes pulled together, sometimes staggered as the project moves from rough-in to finish. The categories below are the ones you'll see on virtually any commercial project.
Building permit
The headline permit for any project that involves new construction, structural modifications, additions, change of occupancy, or major interior alterations. The building permit covers the building shell — framing, foundations, walls, openings, occupancy classification, life safety. Most projects tied to plan review eventually trigger a building permit.
Electrical permit
Required for any new electrical service, panel changes, branch circuit additions, low-voltage installations, or any work governed by the National Electrical Code. On most projects, electrical permits are pulled separately from the building permit, by the licensed electrical contractor doing the work.
Mechanical (HVAC) permit
Covers heating, ventilation, air conditioning, ductwork, mechanical equipment, and exhaust systems. Required for any new HVAC installation or replacement of major equipment, and often required for ductwork modifications even when no new equipment is involved.
Plumbing permit
Required for water supply, sanitary waste, drain and vent piping, gas piping, fixture installations, water heaters, and backflow preventers. Plumbing permits often follow a similar pattern to electrical — pulled by the licensed contractor doing the work, separate from the building permit.
Demolition permit
Required to legally demolish a structure or significant portion of one. Demolition permits are typically pulled before a new build replaces a teardown, and they often appear in the public record weeks or months before any new construction permit on the same parcel — making them an early signal of redevelopment intent.
Sign permit
Required for installation of permanent commercial signage — wall signs, monument signs, blade signs, illuminated signs. Many municipalities also require permits for temporary signage above a certain size or duration.
Specialty permits
Beyond the major categories, most jurisdictions issue specialty permits for narrower scopes:
- Fire permit — for sprinkler systems, alarm systems, hazardous material storage, and certain occupancy types.
- Public works permit — for any work in the public right-of-way (sidewalks, curb cuts, driveways, utility taps).
- Excavation permit — for grading, trenching, or significant earthwork.
- Pool / spa permit — for pool construction, often combined with electrical and plumbing sub-permits.
- Solar permit — for photovoltaic system installation, increasingly handled by streamlined SolarAPP+ flows in some jurisdictions.
- Roofing permit — for roof replacement and significant roof modifications. Required in some jurisdictions, optional in others.
- Tent / temporary structure permit — for temporary structures over certain sizes or durations (event tents, modular sales offices).
Sub-permits and addenda
Larger projects often involve a parent building permit plus a series of sub-permits or addenda issued as the project progresses. Common patterns:
- Foundation-only permit. Issued early to allow foundation work to begin while the rest of plan review continues.
- Shell vs. interior permits. The base building shell is permitted under one permit; tenant build-outs are permitted under separate interior or TI permits.
- Phased permits. Multi-phase projects pull permits per phase as each phase clears review.
- Revision permits. When a project changes scope mid-construction, a revision permit covers the modified work.
Houston-specific considerations
Houston's permit system is operated by the Houston Permitting Center. A few specifics worth knowing:
- Houston publishes weekly sold-permit reports as downloadable spreadsheets — a near-real-time view of every permit issued in the prior week.
- Most non-residential projects route through ILMS plan review first; permits issue after plan review clears. See our ILMS guide.
- Houston uses the term building permit on its weekly reports for the headline permit, with sub-trade permits classified separately (e.g., "Electrical Pmt," "Plumbing Pmt," "Mechanical Pmt").
- The weekly permit report includes project number, permit date, permit type, address, and a comments field with the project description. The comments field is often the most useful column for understanding scope.
- Houston operates separately from Harris County. Projects in unincorporated Harris County go through county permitting, not Houston's.