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Newsroom


Apr 29, 2024
Navigating High Velocity Wind Zones: How to Get Residential Solar Permits Approved
For solar installers, navigating the complexities of obtaining residential solar permits in high-velocity wind zones like Miami-Dade...


Apr 23, 2024
Top 4 Ways Automated Solar Letters Guarantee Savings & Increase Project Profitability
A consistently high-interest rate environment has made it increasingly difficult for solar installation companies to quickly cash flow on...


Jan 22, 2024
2024 Residential Solar Code Changes: What You Need to Know
In the ever-evolving landscape of construction and engineering, staying up to date on the latest building codes is paramount to ensuring...


Jan 11, 2024
Top 2 Ways Automated Solar Letters Reduce Project Soft Costs
Did you know soft costs have been found to account for up to 65 percent of solar project costs? Soft costs, or the non-hardware costs...


Nov 2, 2023
How to Cut Soft Costs & Permit Faster with SolarAPP & Automated Solar Letters
The Solar Automated Permit Processing Plus (SolarAPP) software eliminated 134,000 days of permitting delays last year alone. Since it was...


Sep 5, 2023
Introducing Solar Letters: The Fastest, Most Affordable Way to Receive Accurate Letters & PE Stamps
Castillo Engineering is excited to announce the launch of SolarLetters.com
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