The Full Timeline, Stage by Stage
Scheduling and design comes first, typically 1 to 2 weeks, where the installer finalizes the system layout and the homeowner reviews and signs off on it. Permitting follows, typically 2 to 4 weeks, reviewed by the local Authority Having Jurisdiction rather than the utility. Physical installation itself is fast, just 1 to 3 days of actual work, though crew-scheduling availability can add another 1 to 2 weeks before that work starts. Inspections and utility interconnection close out the process, typically 1 to 4 weeks, ending in Permission to Operate, the utility’s own sign-off that the system can turn on.
Added together, industry experts describe the full window from a signed contract to a system actually turning on as roughly 60 to 90 days. That is the number a sales team should be quoting at signing, not a specific date.
The One Stage the Homeowner Genuinely Controls
Of the four stages, scheduling and design is the one a homeowner can meaningfully speed up, simply by reviewing and approving the proposed system design promptly instead of sitting on it. Permitting and utility interconnection do not work the same way. Both run on the AHJ’s and the utility’s own internal review timelines, and a homeowner calling to check in daily does not move either process along.
That distinction is worth stating plainly, because it tells a homeowner exactly where their own responsiveness matters and where it genuinely does not, rather than leaving them to assume every delay is something they could have prevented.
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Book a Solar CallWhy Setting This Expectation at Signing Prevents a Bad Week Six
A homeowner who hears the full 60-to-90-day range at signing, broken into its four stages, understands why week five without a live system is normal rather than alarming. A homeowner who is not told that range at all tends to assume something has gone wrong the moment the process runs past a rough mental estimate of a few weeks.
Utility interconnection specifically deserves a mention at signing, since it varies more than any other stage, ranging from around 14 days at Duke Energy to 30 or more days at some California utilities. A homeowner in a slower utility’s territory should hear that upfront, not discover it by calling in confused near the end of the process.
What a Sales Team Can Say With Confidence, and What They Cannot
A sales team can confidently say the full process typically runs 60 to 90 days from signed contract to Permission to Operate, broken into scheduling and design, permitting, installation, and utility interconnection. A sales team cannot confidently promise an exact date, because two of the four stages, permitting and interconnection, run on local government and utility timelines outside the installer’s or the sales team’s control.
The honest version of this conversation sets a range, names the one stage the homeowner can actually influence, and flags upfront that utility territory is the single biggest source of variation in how long the last stage takes.
What this means for you
- The full signed-contract-to-Permission-to-Operate timeline runs roughly 60 to 90 days across four stages: scheduling and design, permitting, installation, and utility interconnection.
- Scheduling and design is the one stage a homeowner can meaningfully speed up; permitting and utility interconnection run on AHJ and utility timelines regardless of responsiveness.
- Utility interconnection is the single biggest source of timeline variation, ranging from about 14 days at Duke Energy to 30 or more days at some California utilities.
Sources
The external data in this guide draws on the sources below. Figures described in the text as estimates or industry triangulations are directional and are not attributed to a single dataset.