Houston is the biggest solar market in Texas, and since mid-2024 it's had two lanes: the traditional plan-review path, and an automated SolarAPP+ path that lets registered contractors skip plan review entirely on eligible rooftop systems. Pick the right lane per job and Houston is one of the fastest big-city AHJs in the state; pick wrong and you're in ProjectDox with everyone else.
The traditional lane
Per the Houston Permitting Center's solar PV guidance, the process runs electronically end to end:
- Building permit application via iPermits, with a signed Declaration Supporting Building Permit Application from the property owner — validated against HCAD records, so if ownership doesn't match the appraisal district, upload proof of ownership or expect a hold.
- A plan review fee (25% of the permit fee) paid up front, after which you're invited to upload the full plan set into ProjectDox and mark the review task complete.
- A separate electrical permit, pulled by an electrical master/contractor registered with the City (first-time iPermits users file an Acknowledgement Form; there's even a fax path via form CE-1057 for the electrical permit, though electronic is the norm).
- Structural conformance to the Houston Building or Residential Code's design provisions — Houston is a high-wind coastal jurisdiction, and roof attachment details get read accordingly.
- Inspections scheduled through the system; the master and contractor registrations must be in good standing to schedule, and repeatedly failed inspections draw re-inspection plus admin fees.
The SolarAPP+ lane
Houston partnered with NREL and, after local testing, opened SolarAPP+ to production on July 15, 2024: licensed contractors registered both with SolarAPP+ and with the City of Houston can run eligible rooftop PV applications through the app's automated code check and skip traditional plan review. Setup is a one-time cost — state-licensed electrical contractor, City registration, SolarAPP+ installer registration (the city's how-to guide, form CE-1413, walks the iPermits linkage) — and after that, eligible standard retrofits move at portal speed instead of reviewer speed. Large commercial stays in full plan review.
The operational question isn't whether to register — it's routing: every job should be tagged SolarAPP+-eligible or traditional at design time, because the document packages and timelines differ.
The CenterPoint wrinkle: start interconnection early
Houston's own solar permit guidance carries a notice that an interconnection application must be submitted directly to CenterPoint Energy for approval prior to the start of installation — meaning the utility track isn't a post-inspection afterthought here; it runs in parallel from day one. The full utility process, photo inspection, and PTO rules are in our CenterPoint field guide; the short version is that the city and the utility are two separate approvals with two separate clocks, and Houston expects you to have both moving.
Harris County and the ETJ
Outside Houston city limits, unincorporated Harris County follows the county's own (much lighter) framework — the city permit machinery doesn't apply, but the state electrical code and CenterPoint's full process do. See Solar Outside City Limits. Watch addresses near boundaries: a subdivision that feels like Houston may not be Houston, and submitting to the wrong AHJ costs a week before anyone tells you.
Managing one metro with two permit lanes, an ownership-validation quirk, a parallel utility clock, and a jurisdiction boundary problem is exactly the kind of complexity that breaks tribal-knowledge operations as they scale. TexPTO carries the Houston profile — lane eligibility, document checklist, registration status, and both clocks — on every Houston job, so the routing decision is made once, correctly, at intake.
FAQ
Does Houston require a building permit for rooftop solar? Houston's Permitting Center solar guidance runs solar PV through a building permit application via iPermits plus a separate electrical permit — with SolarAPP+ available to registered contractors as the streamlined path for eligible systems. Some third-party guides claim otherwise; follow the city's own documents.
How fast is SolarAPP+ in Houston? Eligible projects clear the code check in the app and proceed to permit without traditional plan review — the bottleneck becomes your registration status and data quality, not a reviewer queue.
Who can pull the permits? State-licensed electrical contractors registered with the City of Houston; the electrical master's registration must be in good standing to schedule inspections.
Does city approval mean the system can turn on? No — CenterPoint's interconnection, agreement, and PTO still gate energization.
Sources
- Houston Permitting Center, Solar Panel Permit: https://www.houstonpermittingcenter.org/hpwcode1119
- Houston Permitting Center, SolarAPP+ announcement (live July 15, 2024): https://www.houstonpermittingcenter.org/news-events/new-solarapp-streamlined-solar-panel-permitting
- Houston Building Code Enforcement, Solar PV submittal guide (iPermits, Declaration/HCAD validation, 25% plan review fee, CenterPoint notice): https://www.houstonpermittingcenter.org/media/2211/download
- Houston Building Code Enforcement, SolarAPP+ iPermits How-To Guide (CE-1413): https://houstonpermittingcenter.org/media/10386/download?inline=
General information, not legal advice. Verify current Houston requirements and SolarAPP+ eligibility before submitting.