The process to get your system permitted varies based on location, as it’s handled by local municipalities. However, you shouldn’t need to file any local permits yourself unless you do a do-it-yourself (DIY) installation. If you hire a professional installation team, your solar company should handle all the permitting. “60 days is a pretty good average from the contract-signing to installation,” says Tyler Tucker, the chief development officer of Astrawatt Solar. He adds that this process may take longer if your solar installation requires HOA approval.