Customer acquisition is the biggest cost in residential solar. The average cost to acquire a solar customer is $3,000–$5,000 per install. Door-to-door canvassing, lead platforms, and digital ads all compete for the same homeowners.
But there's a channel that most solar companies overlook: building permits.
Why construction permits matter for solar sales
When a homeowner pulls a building permit for a major renovation, re-roofing, or new construction, they're in "project mode." They're already spending money on their home. They're already talking to contractors. And they're already thinking about long-term improvements.
This is the ideal moment to pitch solar:
- Re-roofing permits — if the roof is being replaced anyway, adding solar panels is a no-brainer. No additional roof penetration concerns.
- New construction permits — solar is cheapest to install during construction, and many states now require it.
- Major renovation permits — homeowners upgrading their homes are thinking about energy efficiency and property value.
- Electrical panel upgrade permits — these homeowners are already upgrading their electrical infrastructure, which is often a prerequisite for solar.
The timing advantage
Building permits are filed days or weeks before construction starts. This gives you a window to reach the homeowner while they're still making decisions — before the project is underway and the budget is locked.
A solar sales rep who shows up with "I noticed you're re-roofing your home — have you considered adding solar while the roof is off?" is 10x more effective than a cold knock.
What permit data tells you
For each permit that matches your criteria, you get:
- The address — where to send your crew or your mailer
- The project type — re-roofing, new build, renovation
- The project valuation — higher-value projects correlate with homeowners who can afford solar
- The property owner's name — personalize your outreach
- The contractor on file — potential referral partnership opportunity
How to set up solar permit alerts
- Create a free account on The Permit Sheet
- Set up an alert for your target city
- Filter for permit types: roofing, new construction, electrical
- Set a minimum valuation to focus on qualified homeowners
- Get email notifications as permits are filed
The free plan gives you a weekly digest for one city — enough to test the channel. Upgrade to Starter ($49/mo) for daily alerts across multiple cities with contractor names.
The math
If one solar install is worth $25,000–$40,000 in revenue, and your current customer acquisition cost is $3,000–$5,000, even one additional deal per quarter from permit leads makes the $49/month subscription a rounding error.
The permits are public. The data is there. The only question is whether you get to the homeowner first — or your competitor does.