A grid-connected home solar system usually needs a building and/or electrical permit from your city or county, a final inspection after installation, and written permission to operate (PTO) from your utility before it can run. The installer normally prepares the plans and files the paperwork, but your contract should say so. In cities using the SolarAPP+ instant-permit tool in 2021, getting from permit to passed inspection took 32 days on average versus 45 with traditional review; PG&E then typically issues PTO 5 to 10 business days after the final paperwork. Your city and utility set the actual rules.
The approvals a typical home system needs
The Department of Energy says permitting and inspection are required before a solar array may produce electricity on the grid, that local governments generally require the installer to obtain the permit for rooftop panels, and that rules and fees vary by jurisdiction (DOE, Permitting and Inspection for Rooftop Solar). The usual stack:
Approval | Issued by | What it covers | When |
|---|---|---|---|
Building permit | City or county | Racking, roof attachments, structural load, fire-access setbacks | Before installation |
Electrical permit (sometimes combined with the building permit) | City or county | Wiring, inverter, disconnects, connection to your main panel, any battery | Before installation |
Structural review or engineer’s letter | City or county, where required | Whether the roof framing can carry the array; more common on older roofs | During plan review |
Zoning or fire review | City, county or fire authority, where required | Ground-mount setbacks and height; battery location and fire-code rules | During plan review |
Interconnection application and agreement | Your electric utility | Permission to connect to the grid and the billing arrangement | Ideally filed before installation |
Final inspection | City or county inspector | That the installed system matches approved plans and code | After installation |
Permission to operate | Your electric utility | Written approval to turn the system on; often follows a meter change | After the final inspection |
HOA approval | Your association, where one governs | Design and placement under state law and the HOA documents | Before installation; separate from the permit. See solar panels and HOAs. |
What you do and what your installer does
Your installer, if the contract says so
- site survey, plan set and any engineering;
- permit application, fees and responses to corrections;
- utility interconnection application and final documents;
- scheduling and attending inspections; and
- fixing failed items without extra charge for its own errors.
You
- get HOA approval if you have an HOA;
- read and sign the utility’s interconnection agreement and any required disclosures;
- give access for the inspection;
- do not turn the system on before written PTO; and
- tie the final payment to the passed inspection and PTO where you can.
Utilities spell out the customer’s part. PG&E asks the customer to sign the interconnection agreement after the contractor prepares the application (PG&E, Getting Started with Solar). SDG&E notes that a California solar provider must collect your signature on the state’s Solar Consumer Protection Guide before it submits the interconnection application (SDG&E, Considering Solar).
Red flag: an installer who suggests skipping permits, or asks you to pull an owner-builder permit while its crew does the work, is shifting its legal and code risk to you. Unpermitted work can complicate insurance claims and a home sale, and a utility such as PG&E needs the final building permit before it issues PTO. See solar scams and red flags.
Item | Contract should state | You should receive |
|---|---|---|
Local permit | Who prepares plans, files, pays fees and answers corrections | Permit number and approved plan set |
Structural review | Whether engineering is included and who pays for any reinforcement | Stamped letter or calculations when required |
Utility interconnection | Who files, whether filing happens before installation, and who pays for any grid or meter upgrade | Application and signed agreement |
Inspection | Who schedules, attends and fixes failed items, and who pays reinspection fees | Final inspection approval |
Permission to operate | Who sends final documents and tracks the utility review | Written PTO |
What the permit review does
The plan reviewer checks the design against the building, electrical and fire codes your city or county has adopted. Depending on the project, the package may include a site plan, roof layout, structural information, equipment data sheets, mounting details, a one-line electrical diagram, wire and breaker sizing, service-panel information, labels and battery documents.
- Installer completes the site survey and design.
- Responsible party submits the application and plan set.
- Reviewer approves it or issues corrections.
- Installer answers corrections and the permit is issued.
- Installation follows the approved design.
If equipment, layout or the service connection changes after approval, ask whether a revision must be filed. An unapproved field change can delay the inspection or the utility review.
Instant permits with SolarAPP+, where adopted
SolarAPP+ is a free online platform, developed by NREL with DOE funding, that checks eligible standard residential solar and solar-plus-storage designs against code and lets a city or county issue the permit instantly. More complex systems go to manual review. It works only where your city or county has adopted it (DOE SolarAPP+ overview).
California requires it or an equivalent: Government Code §65850.52 requires cities and counties to run an online, automated permitting platform such as SolarAPP+ for eligible residential solar and paired storage up to 38.4 kW AC. Places with more than 50,000 people had until September 30, 2023; cities of 50,000 or fewer until September 30, 2024. Cities under 5,000 people and counties under 150,000, with the cities in them, are exempt. Separately, §65850.5 requires an expedited process and only one inspection for eligible small rooftop systems, though a separate fire inspection may still apply.
What happens at final inspection
The inspector compares the installed system with the approved plans and the code. The checklist is local, but common items include:
- equipment and array placement, including fire-access pathways on the roof;
- roof attachments and flashing, or foundation work for a ground mount;
- conductors, conduit, grounding and bonding;
- disconnects, overcurrent protection and the service connection;
- required labels, placards and working clearances;
- battery location and protection, when storage is included; and
- whether any approved plan revisions match the field installation.
A failed inspection produces a correction list. Ask for it in writing, who will fix each item and the reinspection date.
Permission to operate comes from the utility, not the inspector
Passing the city or county inspection does not by itself let a grid-connected system run. The utility completes its interconnection review and issues written PTO for your account.
PG&E’s process is a clear example (not a national rule): the contractor files the interconnection application early so you can start generating soon after inspection; after installation and the final city or county inspection, the contractor sends PG&E the interconnection application, a single-line diagram and the final building permit; PG&E reviews them, upgrades the meter and emails or sends written PTO. PG&E says not to turn the system on before that, for safety reasons, and that its engineering review may find grid upgrades that add cost and delay.
City or county
Approves construction and electrical work under locally adopted codes.
Electric utility
Approves the grid connection and the billing arrangement under its tariff and interconnection rules.
How long each step takes
Published figures, each tied to its own source and area rather than to every city or utility:
Stage | Published figure | Source and scope |
|---|---|---|
Permit review | About 9 days on average with traditional review; issued instantly through SolarAPP+ | NREL SolarAPP+ performance review of 2021 data in participating jurisdictions, as summarized by SolarAPP+ |
Permit, installation and inspection together | About 45 days traditional versus 32 days with SolarAPP+ | Same 2021 review |
Installation | A few days to a few weeks | PG&E customer guidance; depends on the home and system |
Inspection | Set by the city or county | PG&E says the timeframe depends on local requirements |
Permission to operate | Typically 5 to 10 business days after PG&E receives the paperwork, up to 30 business days | PG&E only; other utilities differ, and grid upgrades add time |
Delays usually come from incomplete applications and correction cycles, roof, panel or battery complexity, local workload, a failed inspection, design changes after approval, or utility upgrades. Ask the installer for dated milestones you can verify: application submitted, corrections issued, permit approved, inspection requested, inspection passed, final documents sent to the utility, and PTO received. When one stalls, ask which document is missing and who owns the next step.
Keep the final project file
- signed contract and change orders;
- approved permit plan set and permit card;
- structural or engineering documents;
- equipment data sheets and serial numbers;
- inspection approval and any correction records;
- utility application, interconnection agreement and written PTO;
- warranties and installer contact information; and
- monitoring login, commissioning report and shutdown instructions.
Warranty claims, roof work, equipment replacement, insurance questions and a future home sale all go faster with these records.
Can I turn on my solar before permission to operate?
Wait for the utility’s written PTO unless the utility has authorized a specific commissioning test. PG&E, for example, tells customers not to turn the system on before official written permission, for safety reasons. The city or county inspection and the utility’s approval are separate.
Do I need a permit for solar panels in Texas?
Texas has no single statewide solar permit. Cities issue building and electrical permits under their own rules, requirements outside city limits can differ, and your utility must approve the interconnection before the system runs. Ask the permit office that covers your address.
Can I install solar panels myself?
Some places allow an owner to pull permits for their own home, but a grid-connected system still needs a code-compliant design, a permit, a passed inspection and the utility’s approval. Equipment and workmanship warranties may require a qualified or licensed installer, so check the terms first. See where you can install solar panels for site checks before you buy equipment.
How often do solar panels need to be inspected?
The permit inspection happens when the project is finished. New permitted work, such as adding a battery or changing the service panel, brings a new permit and inspection. Routine checkups after that are maintenance, not a government inspection.
Who should pull the permit?
DOE says installers generally obtain rooftop solar permits, but licensing rules and contracts vary. The application should name the responsible licensed party, and you should receive the permit number and approved plans.
Track five pieces of evidence
Before installation: the permit number and approved plans, plus your signed interconnection agreement. After installation: the passed inspection, the final documents sent to the utility, and written permission to operate. Hold the final payment until you have them, and keep copies with your home records.
Still choosing an installer? Ask how long permits and PTO actually take in your town using the questions to ask a solar installer.
Sources checked
Checked October 14, 2026: DOE, Permitting and Inspection for Rooftop Solar; DOE, Streamlining Solar Permitting with SolarAPP+; SolarAPP+ summary of NREL pilot and 2021 performance reviews; California Government Code §65850.52 and §65850.5; PG&E, Getting Started with Solar; SDG&E, Considering Solar.
