The Solar Installation Process: What Happens After You Sign the Contract
Installation

The Solar Installation Process: What Happens After You Sign the Contract

Sarah Okonkwo

Sarah Okonkwo

Residential Solar Engineer

January 10, 2026
7 min read

Most homeowners are surprised by how long installation takes. Here's the real timeline — from site survey to first power generation — and what to expect at each step.

The Typical Timeline: 6–12 Weeks

Signing a solar contract is just the beginning. Here's what the next few months look like:

Week 1–2: Site Survey & System Design

A certified solar designer visits your home to:

  • Measure roof dimensions and pitch
  • Assess shading from trees and structures
  • Inspect your electrical panel (200A panel often required for larger systems)
  • Confirm structural integrity

They'll use this data to finalize your system design and equipment selection.

Week 2–4: Permitting

Your installer submits permit applications to your local municipality and utility company. This is often the longest step — some towns take 2–4 weeks to approve.

Permits required typically include:

  • Building permit
  • Electrical permit
  • Utility interconnection application

Week 4–6: Equipment Ordering & Delivery

Once permits are approved, your installer orders panels, inverters, and mounting hardware. Lead times are typically 1–2 weeks. In 2026, supply chains have normalized — delays are rare.

Week 6–8: Installation Day

The actual installation usually takes 1–3 days for a typical residential system:

Day 1: Roof mounting hardware, conduit runs, electrical work

Day 2: Panel installation, inverter mounting, wiring

Day 3 (if needed): Final connections, system testing, cleanup

Week 8–10: Inspection & Utility Approval

A municipal inspector visits to verify the installation meets code. Then your utility company installs a new bidirectional meter and grants Permission to Operate (PTO).

Week 10–12: System Activation

You get the green light to flip the switch. Your installer walks you through the monitoring app and you start generating clean energy.

Pro Tips for 2026

  • Ask your installer for weekly status updates
  • Take photos of your roof before installation
  • Make sure your homeowner's insurance is updated to cover the system
  • Download your utility's app to track net metering credits
  • If your panel is older than 15 years, budget $1,500–$3,000 for a panel upgrade — many installers require 200A service for modern systems
#installation#solar process#permitting#timeline#what to expect
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