How Long Does a Solar Installation Project Take?

You’ve seen how much you could save by switching to solar. But as you start looking into contractors and timelines, you may wonder how long it will take to complete the project. 

In 2026, this question is more important than ever. Businesses, farmers, and nonprofits who want to qualify for the 30% federal solar Investment Tax Credit face strict deadlines as its expiration date nears.

Generally, a mid-scale solar project takes 3-6 months from contract to completion. It will rarely take over six months. That means that there is likely still time to qualify for the federal tax credit if you are a business, nonprofit, or farmer. But this timeline is subject to variables like interconnection approvals, local permitting, and supply chain delays.

Let’s look closer at these factors and how working with a full-service firm like 1 Source Solar helps cut out unnecessary delays. 

Timing is important because the federal solar tax credit is expiring for businesses, farmers, and nonprofits. A project’s “placed in service” date (when it starts generating electricity) will determine whether it qualifies.

Projects that began prior to the July 3 safe harbor deadline have until Dec. 31, 2030 to be placed in service. This is ample time to go from the start of construction to completion. 

However, projects that did not meet this deadline now only have until Dec. 31, 2027. This timeline of just over a year is tight for large projects, but there is likely still time to qualify. Starting your project before the end of the year will give you the best chance. 

Are you wondering whether your project met the safe harbor deadline? Meeting it could have been as simple as paying a portion of the project’s cost by the date. For a closer look, read our explainer on how to ensure your project falls within the safe harbor deadline.

This phase is all about setting the foundation for a successful project. When you work with 1 Source Solar, we’ll conduct an in-depth site review to finalize your solar system’s design and layout. 

This step involves these preliminary paperwork steps:

• Reviewing and signing your 1 Source Solar contract
• Completing the utility interconnection agreement 
• Providing a copy of insurance showing address and liability limits for the utility company

Finally, a 25% down payment locks in your spot in our project queue.

Estimated Time: 4-12 weeks, depending on project complexity

This is the phase where the action starts taking place. The steps in this part of the process include:

• Securing your interconnection approval from the local utility
• Obtaining the necessary electrical and building permits from local authorities
• Securing your solar components and having them delivered
• Beginning installation

A 50% installment is due at product delivery, and our NABCEP-certified crew gets to work.

Estimated Time: 2-6 weeks, depending on the schedules of the electrical inspector and utility field engineer

After the panels are installed, we program the system and set up the monitoring gateway. 

Next come critical compliance steps:

• State electrical inspection
• Utility witness test 
• Bi-directional meter installation

Once the utility grants permission to operate (PTO), we hand over your handoff packet, conduct a full tutorial, and turn the system on. You will then receive the final 25% invoice. 

Along the way, there are a handful of variables that can shorten or lengthen the estimated timeline. Here’s a closer look at these factors and how your solar installer can help to shorten them. 

The federal government has tightened requirements on component sourcing for solar panel projects. For a project to qualify for the federal tax credit, a certain share of parts must not be sourced from foreign entities of concern (FEOC). These include companies connected with nations such as Iran, China, or North Korea. The rush on these parts can cause supply chain delays, particularly as more projects attempt to get in by the deadlines. 

That’s why working with an established EPC firm like 1 Source Solar can help. We use suppliers who ensure we receive compliant materials in a reasonable timeline.

Solar installations generally require electrical and building permits from local authorities. The timeline for these approvals will depend on their individual processing times. 

1 Source Solar works closely with many of the most prominent governing authorities in the Midwest. This allows us to be deeply familiar with their processes. These relationships and our dedication to accuracy help us keep any delays in this part of the process to a minimum.

Interconnection agreements are a necessity for any solar installation project. They are an agreement between the system owner and the local electric utility company. The contract covers how your solar panels will exchange energy.

Bottlenecks during peak seasons, paperwork errors, or design issues can all delay these agreements.

At 1 Source Solar, we have years of experience working closely with utility companies. This allows us to move more quickly. We get your equipment installed and inspected right the first time, eliminating any unnecessary delays.

It goes without saying: Midwestern weather is a high variable for any type of construction project. Spring and summer are often peak seasons for installation, meaning wait times may be longer. Winter, though less busy, can bring strong storms and extreme cold. 

At 1 Source Solar, our teams have worked throughout the Midwest and are familiar with all of the necessary precautions for weather. Even if the weather causes a temporary setback, we’ll be back on the job as soon as possible.

It’s not too late to qualify for the Federal Tax Credit. Talk with the solar specialists at 1 Source Solar for a free estimate and to see if your project can be completed in time. While we can never fully guarantee a completion date, our team will work to ensure your project moves as quickly as possible.