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Industry’s Fastest Residential Solar Letters

We deliver fast & accurate structural letters and PE stamps through advanced automation

- guaranteed or your money back.

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Permit Faster & Spend Less!

first-time approval rating

years of experience

solar letter capacity per month

Our benefits

Zero AHJ Rejection Guarantee

Solar Letters leverages Castillo Engineering’s experience since 1998, which has an industry leading 99.9% first time approval rating. If our letter receives an AHJ rejection, we will gladly issue you a full credit.

Fastest Turnaround Guarantee

We pride ourselves on our advanced automation, as we know how important it is to receive your stamps within the hour. If you do not receive your letter by the next business day or less, you will receive a full credit. 

Lowest Price Guarantee

We will match or beat any documented competitor price. We also offer volume discounts through our Permit Partner Program.

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Services

The quickest, most cost effective, letters and PE stamps in the industry

Learn more about our services

Structural Letters

Electrical Stamps

Post - Installation Letters

CAD Design & Stamps

Sign up to get started!

Maximize profits with SolarLetters.com

“The customer service provided by Solar Letters is exceptional. Their team is responsive and always ready to help support Titan Solar Power to permit our projects quickly.”

Dalton Garris
External Design Manager
Titan Solar Power

“The Solar Letters platform is a game-changer for LGCY! It has simplified the structural and electrical engineering process and increased our turn times on stamped projects!”

Ben Ogden
Manager, Design and Engineering
LGCY Power

ADT Solar is consistently impressed with the Solar Letters team's expertise. Their industry knowledge is clear in every interaction, and the quality is unmatched!"

Tanner Smith

Lead, PV Design

ADT Solar

Lowest price or price match guarantee

Best Price Guaranteed

Fastest Turnaround Guarantee

We pride ourselves on our speed, as we know how important it is to permit your project quickly.

Industry leading 99.9% first time approval rating

Zero AHJ Rejection Guarantee

Can handle up to 100,000 letters per month

Large Order Capacity

Dedicated team for each client; improves turnaround time

Elite Customer Service Experience

What makes

us different

NEWSROOM

The latest from SolarLetters.com

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Following us on Linkedin lets you stay connected and receive all of our company news and updates

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Get started with SolarLetters.com today!

“The customer service provided by Solar Letters is exceptional. Their team is responsive and always ready to help support Titan Solar Power to permit our projects quickly.”

Dalton Garris
External Design Manager
Titan Solar Power

“The Solar Letters platform is a game-changer for LGCY! It has simplified the structural and electrical engineering process and increased our turn times on stamped projects!”

Ben Ogden
Manager, Design and Engineering
LGCY Power

ADT Solar is consistently impressed with the Solar Letters team's expertise. Their industry knowledge is clear in every interaction, and the quality is unmatched!"

Tanner Smith

Lead, PV Design

ADT Solar

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