US solar installers don't have one national permitting clock - they have as many as they have AHJs. Here's what that variance actually costs a growing install business, backed by NREL data.
Matt Franklin
A UK solar installer answers to one national scheme. MCS certification, one set of standards, one DNO application process via ENA Connect. It's strict, but it's predictable - every job clears the same gate in roughly the same way.
US installers don't get that. There is no MCS equivalent. Permitting authority sits with whichever AHJ - city, county, or utility - covers the job site, and every one of them can set its own rules, forms, and review queue. NREL's SolarAPP+ Performance Review of 2023 data puts the spread in stark terms: the median permit review in a SolarAPP+ jurisdiction is zero business days - approval is instant for a code-compliant application - while the median for traditional manual review is 7 business days, 13% of traditional permits take more than 30 business days, and 4% take longer than 60. Measured across the full journey from permit submission to passed inspection, the medians were 33 business days with SolarAPP+ against 47.5 without.
If every job took 60 days, you'd plan for 60 days. The actual operational pain comes from not knowing which clock applies until you're already scheduling the crew. SolarAPP+ adoption is growing, but it's still thin: NREL's review counted 97 jurisdictions fully adopted and 70 piloting at the end of 2023, against the thousands of city, county, and utility authorities that can each independently gate a solar permit. An installer working three counties might have one running SolarAPP+, one on a four-week manual queue, and one that requires a licensed engineer's stamp above a certain system size before it will even accept the application.
That means the same sales rep quoting two nearly identical jobs a mile apart can be promising a two-week install on one and a two-month install on the other, without either of them realizing it until the permit comes back.
The 14.5-business-day median reduction NREL attributes to SolarAPP+ adoption isn't just a wait-time number - it's three working weeks a truck, a crew, and a project sit in limbo instead of turning into revenue. Scale that across a 20-installs-a-month business working even two or three AHJs with different review speeds, and the admin cost compounds in a specific way:
None of this is a compliance failure. Every one of these installers is doing everything right - it's an operations problem created by running a growing business across a permitting map that was never designed to be run at scale.
The installers who scale past this don't solve it by getting faster at any one AHJ - they solve it by getting a single, accurate view of where every job actually stands, regardless of which jurisdiction it's sitting in. That means one system tracking every project from quote to install, so the office isn't reconciling five separate spreadsheets or logging into a dozen different portals to answer "where is this job."
If you're scaling into new counties or states, the operational question to ask before you expand isn't "what does this AHJ require" - it's "will my team be able to see this job's status without someone manually checking."
That's the gap Payaca closes for growing US solar installers: one place to see every project's status, whatever stage of whichever jurisdiction's process it's in, so scheduling and sales are working from the same reality as the crew in the field.
Permitting variance isn't going away - there's no national standard on the horizon, and every jurisdiction is free to set its own pace. The installers who keep growing anyway are the ones who stopped trying to predict the permitting clock and started tracking it instead.
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