A typical US home solar project moves through site assessment, detailed design, contract review, local permits, utility interconnection application, installation, inspection, commissioning, meter work, and permission to operate. Local government approval and utility approval are separate processes, and requirements vary across thousands of jurisdictions and electric providers.
Physical installation may take only a few days. Administrative reviews, corrections, inspections, equipment availability, and utility work often control the total timeline.
1. Collect electricity and property information
Provide at least twelve recent months of electricity use when available. Include plans for an electric vehicle, heat pump, home addition, pool, or efficiency upgrades.
Identify the serving utility, rate plan, ownership type, roof age, homeowners association, and any known electrical issues. The utility territory determines interconnection and export rules, while the city or county usually controls building and electrical permits.
Define whether the project needs solar-only savings, battery load shifting, essential-load backup, or broader outage support.
2. Compare qualified installers
Obtain multiple written proposals based on the same usage data and goals. Verify state or local contractor licensing, insurance, business identity, complaint history, and who performs the work.
Professional certifications can demonstrate training but do not replace required licenses. Ask whether employees or subcontractors install the system and who handles service after commissioning.
Use How to Compare Solar Quotes to normalize capacity, production, scope, warranties, and financing.
3. Complete the site survey
The survey should verify roof dimensions, structure, covering condition, shade, access, attachment method, electrical service, panelboard, meter, grounding, cable routes, and equipment locations.
Battery projects need suitable location, clearances, protection, communications, temperature conditions, and backup-circuit planning. Local fire and building requirements may affect placement.
Do not accept final design solely from aerial imagery. The survey can reveal upgrades and exclusions that materially affect cost.
4. Review the detailed design
The design should show panel layout, DC capacity, inverter architecture, production estimate, electrical diagram, mounting, protection, rapid-shutdown equipment where required, monitoring, batteries, and backup circuits.
US codes are adopted and amended locally, so applicable electrical, building, structural, and fire requirements depend on the authority having jurisdiction, often shortened to AHJ.
Confirm exact model numbers and the procedure for substitutions.
5. Sign a complete contract
The contract should state cash price, financing, equipment, production estimate, scope, exclusions, payment milestones, schedule assumptions, cancellation rights, warranties, and responsibility for permits and interconnection.
It should explain what happens if structural work, service upgrades, utility studies, transformer changes, trenching, or redesign becomes necessary.
Do not rely on the former federal 30% homeowner credit for a system placed in service in 2026. Current IRS guidance says the credit ended after December 31, 2025.
6. Submit the utility interconnection application
The utility evaluates whether the proposed distributed generation can connect safely to its distribution system. It may request equipment certifications, one-line diagrams, site plans, inverter settings, export controls, insurance, fees, or technical studies.
Some utilities allow application before local permits; others coordinate at a later stage. Battery and non-export configurations may use different forms.
Ask whether the installer submits the application in the homeowner's name and obtain a copy. The application determines the requested tariff and system configuration.
7. Obtain local permits
Local governments commonly require electrical and building permits. Structural, zoning, planning, fire, or historic approvals may also apply.
Automated tools such as SolarAPP+ can speed eligible standardized projects in participating jurisdictions, but adoption is not universal. Corrections can occur when plans omit information or conflict with local amendments.
Permit approval authorizes construction under local requirements. It does not grant utility permission to export or operate.
8. Install the system
The crew installs roof attachments, mounting, panels, wiring, inverter equipment, protection, labels, monitoring, and any storage or backup controls.
Qualified electrical work is essential. Solar arrays produce DC voltage in light even when the grid is off. Backup systems also need safe isolation from utility lines.
Photographs of attachments, concealed wiring, labels, and equipment before closure can become valuable records.
9. Local inspection
The AHJ inspects the project for compliance with approved plans and applicable codes. Corrections may be required before final approval.
Inspection scope varies. A passed local inspection confirms the installation meets that authority's requirements; it does not necessarily mean the utility has completed interconnection review.
Keep the signed permit or inspection record.
10. Utility review, meter work, and permission to operate
After receiving required documents, the utility may conduct review or inspection, update metering, confirm settings, and issue permission to operate, often shortened to PTO.
Do not turn on or export from the system before the utility permits operation. Some equipment can be commissioned in a controlled non-export mode, but the installer and utility rules must govern that process.
The meter may be replaced or reprogrammed to record imports and exports. Export compensation begins under the approved tariff, not merely when panels are mounted.
11. Commissioning and handover
Commissioning verifies electrical operation, protection, inverter settings, monitoring, and expected power flow. Backup systems should be tested under outage conditions with the intended circuits.
Collect:
- Contract and final invoice.
- Approved plans and as-built diagram.
- Permit and inspection records.
- Interconnection agreement and PTO.
- Tariff name and export rules.
- Model and serial numbers.
- Product and workmanship warranties.
- Test results and production estimate.
- Monitoring credentials.
- Shutdown and emergency instructions.
How long does the US process take?
Straightforward projects can move quickly in streamlined jurisdictions, while others take weeks or months. Delays may come from incomplete applications, local review, structural questions, equipment, weather, inspections, utility studies, meter availability, or grid upgrades.
Request milestone dates for survey, design, permit submission, interconnection submission, installation, inspection, corrections, and PTO. Separate installer-controlled time from external review.
Interconnection costs and upgrades
Many routine residential projects use simplified review, but fees and technical requirements vary. A constrained circuit may require export limits, equipment changes, studies, or utility upgrades.
The contract should state who pays if the utility requires work beyond the quoted scope. Do not assume every upgrade is included or every application will be approved unchanged.
Consumer protections vary by state
States may require disclosure forms, contract language, cancellation periods, licensing, salesperson registration, or special financing protections. California, for example, requires its Solar Consumer Protection Guide for covered residential interconnection applications.
Use the state regulator, attorney general, licensing board, and utility as primary sources.
Completion means permission, performance, and records
A US solar installation is complete when it is safely installed, locally approved, authorized by the utility, commissioned, visible in monitoring, and supported by the final document package.
For the universal construction sequence, see Solar Panel Installation Process. Continue through the United States Home Solar Guide for current tariffs and incentives.