Tierzero
Licensed security system installer in Los Angeles, California
Tierzero holds CSLB licence 1103605, active, licensed since 17 Apr 2023, rated 4.9 from 66 Google reviews. Bonded for $25,000 with American Contractors Indemnity Company. Clean CSLB record, with no citations, complaints or legal actions disclosed.
Report card
- Licence activeCSLB #1103605, class C-7. Issued 17 Apr 2023, expires 30 Apr 2027.
- Licensed 4 yrsSince 17 Apr 2023.
- Bonded$25,000 with American Contractors Indemnity Company, since 23 Jan 2023. California requires the same $25,000 bond of every contractor.
- Clean CSLB recordNo citations, complaints or legal actions disclosed.CSLB record
Checked against the Contractors State License Board (CSLB) register on 4 Nov 2026.
About Tierzero
- People on the licence
- Jesus Jose Salas Retana (qualifier), John Erwin Carter (CEO and president)
Google reviews
4.9(66 reviews)Shawn Holman★★★★★ 7 months agoView on Google
Tierzero support is great to work with. Their response time is very fast and they are thorough and fast in helping solve issues and providing answers. The few questions I've had have been answered within minutes and hours rather than days. I'm very pleased with their service and support.
Jane Kim-Robles★★★★★ 7 months agoView on Google
We’ve been with Tierzero for our phone and fax services for over 10 years, and our experience has been consistently excellent. The service itself is very reliable we’ve never encountered any major issues, which is incredibly important for a busy medical office like ours. What truly stands out is their customer support. Every time we call, our concerns are handled promptly, professionally, and with genuine care. Thei…
Louie Dickinson★★★★★ 7 months agoView on Google
We've been using Tierzero for more than twenty years now and I'm genuinely impressed with their service. The coverage is reliable and consistent and never had a downtime. Their customer support team is friendly, responsive, and always ready to assist with any questions or issues. I also appreciate their flexible plans and clear billing system, which make managing our services simple and stress-free. Overall, Tierzero…
Hannah Trainor★★★★★ 7 months agoView on Google
Our company is pretty large and we rely heavily on stable internet, phone systems, and network infrastructure to keep everything running smoothly. Tierzero handles our business internet, voice systems, and managed network services, and honestly over the span of 5 years we NEVER have issues — only the occasional question. That kind of reliability is huge when you’re running a big operation. I spoke with Rathany today…
Rommel Berenguer★★★★★ 7 months agoView on Google
I have been with Tierzero for the past 12 years, and boy... It has been an outstanding partner to work with. Their team is professional, knowledgeable, and always responsive, making every interaction smooth and efficient. They truly go above and beyond to deliver quality service and solutions, and it shows in the results. Highly recommend them to anyone looking for reliability and excellence!
Read all 66 reviews on Google Reviews and photos from Google, 4 Nov 2026.
Why it ranks #74 of 524 security system installers in Los Angeles
Score 66.5 / 100. Claiming this listing or using Theo never changes it. How we rank
Other top security system installers in Los Angeles
See all 524- 1
Security Plus Co
- Licence active
- Bonded
- Workers' comp
- 2
Construction Services Unlimited
- Licence active
- Bonded
- Works alone
- 3
Network Experts Inc
- Licence active
- Bonded
- Workers' comp
- 4
Secure Tech
- Licence active
- Bonded
- Workers' comp
- 5
LA Russa Audio / Video Design Inc
- Licence active
- Bonded
- Workers' comp
- 6
Safeguard Alarm & Electrical Corp
- Licence active
- Bonded
- Workers' comp