Greg Marthaler Jr., Owner · Established 2010
Accreditation Status
Cycle 2026
Status
Not Accredited
Review not yet completed
ARCO Accreditation is reserved for roofing businesses that complete a comprehensive review and meet ARCO's required qualification threshold. Not every business reviewed qualifies.
Issued only after successful review
Accreditation No.
Not Issued
Accreditation Status
Not Accredited
Accreditation Review
Not Completed
Qualification Status
Not Determined
About ARCO Accreditation
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Public Record
Findings drawn from public records, manufacturer registries, and third-party review platforms — synthesized using ARCO Standard 2026.1.
Public Signals Reviewed
18
across 4 categories
Customer Review Rating
4.6/5.0
across 84 verified reviews
Years in Business
16+yrs
Founded 2010
Accreditation Review
Not Yet Completed
Qualification has not been determined
Accreditation Committee Review
No committee determination has been issued.
Not Yet ConductedThe source findings below have been independently verified for this company profile. A formal ARCO Accreditation Committee review has not yet been completed, and qualification for accreditation has not been determined.
Only businesses that complete the full review and meet ARCO's required threshold may receive accreditation.
Signal
SAM.gov federal exclusions
Result
No exclusions found
Checked August 2026
SAM.gov
Signal
Manufacturer certifications
Result
Owens Corning Preferred
Manufacturer programs
Signal
Years in operation
Result
16+ years continuous
Founded: 2010
Verified record
Signal
Owner/principal
Result
Mr. Greg Marthaler Jr.
Manual collection
Signal
Website registration
Result
Registered: May 20, 2010
WHOIS/RDAP
Signal
Google Business Profile
Result
G2 Roofing & Construction
Centennial, CO
Signal
Aggregated marketplace rating
Result
4.6 / 5.0 across 84 reviews
Google 4.6 (84)
Multi-source
Signal
Review volume
Result
84 stored public reviews
Multi-source
Signal
Customer review excerpts
Result
7 qualifying reviews on file
Multi-source reviews
Signal
BBB rating
Result
A+
BBB profile
Signal
OSHA findings
Result
No violations across 0 inspections
OSHA
Signal
BBB complaint history
Result
No complaints filed in the last 36 months
Years in business: 16
BBB profile
Public records and third-party platform data may change over time. ARCO does not guarantee ongoing third-party accuracy.
CO-260808-5634
·
Evaluated Aug 8, 2026
·
Independently verifiable at
RoofingContractors.org/verify/CO-260808-5634
Eligibility · All Cleared
ARCO automatically withholds accreditation when any of the following findings are present. G2 Roofing & Construction's record was checked against each.
Active SAM.gov federal exclusion
OSHA willful violation or 3+ repeat violations on record
BBB rating of C, D, or F
Avg. customer rating < 4.0 (with ≥ 20 reviews)
Roofing contractor
Contact G2 Roofing & Construction to confirm availability for your project in Colorado.
ARCO Review Findings
G2 Roofing & Construction is highly regarded for its professional, knowledgeable team that delivers high-quality workmanship, completes projects on schedule, and maintains clean job sites. Customers frequently praise the company's clear communication, helpful guidance throughout the installation process, and reliable service.
G2 Roofing exceeded my expectations! From the initial consultation to the final inspection, their team was professional, knowledgeable, and attentive. They provided a detailed estimate and helped me choose the best roofing materials for my home. The installation process was efficient, and they kept the workspace clean. I was particularly impressed with their commitment to quality and customer satisfaction. My new roof looks fantastic, and I've received numerous compliments from neighbors! I highly recommend G2 Roofing for anyone in need of roofing services. Five stars well deserved!
I had an excellent experience with G2 Roofing and Construction. From the initial consultation to the final inspection, their team was professional, knowledgeable, and efficient. They took the time to explain every step of the process and answered all my questions thoroughly. The quality of their work is outstanding, and they completed the project on time and within budget. I highly recommend G2 Roofing and Construction for any roofing or construction needs. They truly exceeded my expectations!
I recently hired G2 Roofing for a complete roof replacement, and I couldn’t be happier with the results. Their team was professional, efficient, and incredibly knowledgeable. They walked me through the entire process, ensuring I felt confident in my choices. The quality of work was outstanding, and they left the site clean and tidy. I highly recommend G2 Roofing for anyone in need of roofing services!
We had an absolutely perfect experience getting our entire roof replaced with Stanley at G2 roofing. From square one he was incredible. Stanley always showed up on time, explained everything and was super communicative every step of the way. He took care of everything directly with our insurance company and knew the answer to every question. He went out of his way to help us with design choices and made sure we and our house were ready for the install. He even seamlessly dealt with it when excel decided to close our street for utility work the same day that roofing materials arrived! On the day of the install the crew arrived right as scheduled and went to work. Stanley was on site and in contact with us the entire time. They finished the entire job in one day and at the end of the day there was no sign they had ever even been there (other than the new roof!!). Stanley and his crew did a triple check for nails all around our property and showed a lot of amazing care for us and our dogs. I would highly recommend Stanley and G2 roofing to anyone.
I recently hired G2 Roofing & Construction for a new roof installation, and I couldn't be happier with the results. Their team was professional, prompt, and attentive to detail, ensuring everything was done to perfection. They kept me informed throughout the process and finished ahead of schedule. I highly recommend them for anyone in need of quality roofing services.
Review data aggregated from public sources · ARCO does not moderate third-party reviews
The difference between "good enough" and proven excellence. Only the top roofers in America earn ARCO Accreditation — recognition of true craftsmanship, ethics, and integrity.
Peace of Mind: Every ARCO-Accredited roofer has been checked against public licensing records, safety records, complaint history, and verified customer reviews.
Work You Can Trust: ARCO's evaluation includes manufacturer certification programs — credentials that can help preserve your roof's warranty coverage.
Verified, Not Self-Reported: ARCO's findings come from government and third-party sources — state filing offices, SAM.gov, OSHA, and the BBB — not from paperwork a contractor submits about itself.
A Public Paper Trail: Every accredited profile publishes its report number, evaluation date, and sources — so any homeowner can independently verify the findings at RoofingContractors.org.
Contact G2 Roofing & Construction
Call (303) 471-5855 or request a written estimate through www.g2roofing.com/contact-centennial-co.