Overview
About Us
Wm. Green Roofing Ltd. has been providing professional roofing services to Guelph and surrounding areas since 1986. We specialize in both shingle and flat roofing, for both residential customers and large industrial, commercial and institutional projects.
*Contractors enrolled in GAF certification programs are not employees or agents of GAF, and GAF does not control or otherwise supervise these independent businesses. Contractors may receive benefits, such as loyalty rewards points and discounts on marketing tools from GAF for participating in the program and offering GAF enhanced warranties, which require the use of a minimum amount of GAF products. Your dealings with a Contractor, and any services they provide to you, are subject to the Contractor Terms of Use.
Customer Reviews
"This company installed a new roof on my home almost 10 years ago and it still looks like new, so I hired them to replace the roof on my mom's house and they did a great job. Everyone from the estimator to the crew who dropped off the shingles to the roofers themselves were professional. Both roofs were complex jobs with steep angles and valleys, but everything was done perfectly."
"Wm. Green Roofing replaced our roof July 2022 and we are very pleased with the results. Very professional. Starting with Jesse, then Jack and the crew that completed the roof install. Job was started and completed on schedule and we are very satisfied with the quality of work and the product. Roof looks wonderful and we highly recommend Wm. Green Roofing."
"We just had our shingles replaced and we are very happy with the job they did. The quote was competitive, the roof looks great and the staff was easy to deal with."
Awards
Consumer Protection Excellence Award
This award recognizes those contractors that best protect their clients with system selling and enhanced warranties.
Training Excellence Award
This award is for contractors that are committed to training and continuous improvement.
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GAF Awards & Certifications
Residential Contractors
Commercial Contractors
Awards
Master Elite®
A mark of roofing excellence. Only 2% of roofers in North America are invited to become GAF Master Elite® Contractors. It can’t be bought. It can only be earned.*
Get peace of mind with a Master Elite® Contractor Contractor
At GAF, we evaluate thousands of roofers in the country and make sure they're insured and have state licenses (in states that require them) so they can offer our best warranties.
This certification requires a minimum of 7 years of experience, is renewed yearly and requires the contractor to be:
Properly insured & licensed:
For your protection, so you can rest easy knowing you're covered
- $1M+ Liability Insurance
- Worker's Compensation Insurance
- State licensed where required and applicable
Reputable & trustworthy:
With a track record of providing quality roofing services in your community
- Good standing with the Better Business Bureau
- Good credit rating per Experian
Highly qualified:
Up to date on the latest technology and practices, ensuring expert installation
- High property owner job satisfaction ratings
- Able to offer the strongest GAF warranties
Your connection to stronger GAF warranties
The GAF Shingle & Accessory Limited Warranty provides a Lifetime limited warranty term and 10-year 100% coverage period during which GAF will provide both installation labor costs and replacement GAF products necessary to repair your roof due to a manufacturing defect for 10 years.
A GAF Master Elite® Contractor can also offer the GAF System Plus Limited Warranty, increasing your Smart Choice® Protection Period from 10 to 50 years and including tear off.
| Non-certified Contractor | Certified Contractor | Master Elite Contractor | |
| GAF Shingle & Accessory Limited Warranty | ✓ | ✓ | ✓ |
| WindProven™ GAF Roofing System Limited Warranty | ✓ | ✓ | ✓ |
| GAF System Plus Limited Warranty | - | ✓ | ✓ |
| GAF Silver Pledge™ Limited Warranty | - | - | ✓ |
| GAF Golden Pledge® Limited Warranty | - | - | ✓ |
*Contractors enrolled in GAF certification programs are not employees or agents of GAF, and GAF does not control or otherwise supervise these independent businesses. Contractors may receive benefits, such as loyalty rewards points and discounts on marketing tools from GAF for participating in the program and offering GAF enhanced warranties, which require the use of a minimum amount of GAF products. Your dealings with a Contractor, and any services they provide to you, are subject to the Contractor Terms of Use.
Certified™
Only 7% of roofers in North America are invited to become GAF Certified™ Contractors. It can’t be bought. It can only be earned.*
Get peace of mind with a Certified™ Contractor
At GAF, we evaluate thousands of roofers in the country and make sure they're insured and have state licenses (in states that require them) so they can offer our best warranties.
This certification requires a minimum of 3 years of experience, is renewed yearly and requires the contractor to be:
Properly insured & licensed:
For your protection, so you can rest easy knowing you're covered
- $1M+ Liability Insurance
- Worker's Compensation Insurance
- State licensed where required and applicable
Reputable & trustworthy:
With a track record of providing quality roofing services in your community
- Good standing with the Better Business Bureau
- Good credit rating per Experian
Highly qualified:
Up to date on the latest technology and practices, ensuring expert installation
- High property owner job satisfaction ratings
- Able to offer the strongest GAF warranties
Your connection to stronger GAF warranties
The GAF Shingle & Accessory Limited Warranty provides a Lifetime limited warranty term and 10-year 100% coverage period during which GAF will provide both installation labor costs and replacement GAF products necessary to repair your roof due to a manufacturing defect for 10 years.
A GAF Certified™ Contractor can also offer the GAF System Plus Limited Warranty, increasing your Smart Choice® Protection Period from 10 to 50 years and including tear off.
| Non-certified Contractor | Certified Contractor | Master Elite Contractor | |
| GAF Shingle & Accessory Limited Warranty | ✓ | ✓ | ✓ |
| WindProven™ GAF Roofing System Limited Warranty | ✓ | ✓ | ✓ |
| GAF System Plus Limited Warranty | - | ✓ | ✓ |
| GAF Silver Pledge™ Limited Warranty | - | - | ✓ |
| GAF Golden Pledge® Limited Warranty | - | - | ✓ |
*Contractors enrolled in GAF certification programs are not employees or agents of GAF, and GAF does not control or otherwise supervise these independent businesses. Contractors may receive benefits, such as loyalty rewards points and discounts on marketing tools from GAF for participating in the program and offering GAF enhanced warranties, which require the use of a minimum amount of GAF products. Your dealings with a Contractor, and any services they provide to you, are subject to the Contractor Terms of Use.
Master Select™
Get assurance that you’ll be dealing with a quality, reputable and dependable professional when you choose a GAF Master Select™ Contractor.
GAF Master Select™ Contractors must have a minimum of 5 years of experience are required to be:
Properly insured & licensed:
For your protection, so you can rest easy knowing you're covered
- $1M+ Liability Insurance
- Worker's Compensation Insurance
- State licensed where required and applicable
Reputable & trustworthy:
With a track record of providing quality roofing services in your community
- Good standing with the Better Business Bureau
- Good credit rating per Experian
Highly qualified:
Up to date on the latest technology and practices, ensuring expert installation
- GAF trained and certified
- Able to offer enhanced GAF commercial warranties and guarantees
GAF Master Select™ Contractors are your connection to the strongest GAF commercial guarantees and warranties
| Non-GAF Contractors | GAF Master Contractor | Master Select™ Contractor | |
| Standard Limited Product Warranty | ✓ | ✓ | ✓ |
| Weather Stopper© Integrated System Limited Warranty | - | ✓ | ✓ |
| System Pledge™ Limited Warranty | - | ✓ | ✓ |
| Emerald Pledge™ Limited Warranty | - | ✓ | ✓ |
| Diamond Pledge™ NDL Roof Guarantee | - | 30 year maximum term No Dollar Limit Guarantees (NDL) | 35 year maximum term No Dollar Limit Guarantees (NDL) |
*Contractors enrolled in GAF certification programs are not employees or agents of GAF, and GAF does not control or otherwise supervise these independent businesses. Contractors may receive benefits, such as loyalty rewards points and discounts on marketing tools from GAF for participating in the program and offering GAF enhanced warranties, which require the use of a minimum amount of GAF products. Your dealings with a Contractor, and any services they provide to you, are subject to the Contractor Terms of Use.
Master
Get assurance that you’ll be dealing with a quality, reputable and dependable professional when you choose a GAF Master Contractor.
GAF Master Select™ Contractors must have a minimum of 5 years of experience are required to be:
Properly insured & licensed:
For your protection, so you can rest easy knowing you're covered
- $1M+ Liability Insurance
- Worker's Compensation Insurance
- State licensed where required and applicable
Reputable & trustworthy:
With a track record of providing quality roofing services in your community
- Good standing with the Better Business Bureau
- Good credit rating per Experian
Highly qualified:
Up to date on the latest technology and practices, ensuring expert installation
- GAF trained and certified
- Able to offer enhanced GAF commercial warranties and guarantees
GAF Master Contractors are your connection to the strongest GAF commercial guarantees and warranties
| Non-GAF Contractors | GAF Master Contractor | Master Select™ Contractor | |
| Standard Limited Product Warranty | ✓ | ✓ | ✓ |
| Weather Stopper© Integrated System Limited Warranty | - | ✓ | ✓ |
| System Pledge™ Limited Warranty | - | ✓ | ✓ |
| Emerald Pledge™ Limited Warranty | - | ✓ | ✓ |
| Diamond Pledge™ NDL Roof Guarantee | - | 30 year maximum term No Dollar Limit Guarantees (NDL) | 35 year maximum term No Dollar Limit Guarantees (NDL) |
*Contractors enrolled in GAF certification programs are not employees or agents of GAF, and GAF does not control or otherwise supervise these independent businesses. Contractors may receive benefits, such as loyalty rewards points and discounts on marketing tools from GAF for participating in the program and offering GAF enhanced warranties, which require the use of a minimum amount of GAF products. Your dealings with a Contractor, and any services they provide to you, are subject to the Contractor Terms of Use.
Premium Coating Systems
Contractors with Premium Coating Systems certification focus on coatings and liquid membranes, and have a proven track record specifically with these products. Their training and project performance with GAF have enabled them to qualify for this distinct designation.
Premium Coating Systems certification requires proper insurance and licensing, a strong reputation for quality, and a commitment to understanding the latest technology and installation methods.
Contractors with GAF Premium Coating Systems certification are also your connection to the strongest GAF commercial guarantees and warranties for this product category
President's Club Award
These contractors represent the best of the best of our Master Elite®, Master Select™, and Premium Coating Systems Contractors.
They have distinguished themselves by meeting stringent requirements in the categories of Performance, Reliability, or Service.