Cost-Effective Roof Installation & Replacements

• Seasonal discounts up to 30% and 6-month financing available

Professional Solutions

Our Roofing Services

Reliable roofing solutions for residential and commercial properties. From new roof installations to full roof replacements, we provide durable Asphalt, Metal, and Flat roofing systems built for long-term performance.

Asphalt · Metal · Flat

Roof Installation

Complete removal, supply, and installation of residential and commercial roofing systems built for long-term durability, energy efficiency, and reliable protection in Canadian weather conditions.

✓  Residential roof installation
✓  Commercial roofing installation
✓  Material selection guidance
✓  Quality craftsmanship guarantee

Leaks · Storm Damage · Urgent

Roof Replacement

Professional roof replacement services for aging, damaged, or worn roofing systems. Our team delivers durable replacement solutions designed to improve protection, performance, and curb appeal.

✓  Leak detection and replacement
✓  Storm damage restoration
✓  Shingle replacement
✓  Flashing and seal replacement

Professional Solutions

Common Roof Replacement We Handle

These are just a few of the roofing replacements we commonly handle, but we’re ready to tackle any roofing issue you may encounter.

Leaks and Water Damage

We locate and fix roof leaks quickly to help prevent moisture damage inside your home.

Missing or Damaged Shingles

We replace broken or missing shingles to keep your roof protected and secure.

Storm and Hail Damage

We repair storm-related roof damage caused by hail, wind, and harsh weather conditions.

Flashing and Ventilation Issues

We repair damaged flashing and ventilation systems to help prevent leaks and moisture buildup.

Gutter Repairs

We fix damaged or blocked gutters to ensure proper water flow and protect your home.

Sagging Roofs

We reinforce sagging roof structures to restore stability and prevent further damage.

Roofing Materials We Offer

With Credentials

Our Values & Commitments

Quality Craftsmanship

Dedicated to providing exceptional quality and attention to detail in every project.

Integrity & Transparency

Building lasting relationships through honest communication and transparent business practices.

Client-Focused Approach

Putting customer needs first and striving to exceed expectations at every stage.

Trusted & Reliable Service

Delivering dependable solutions with projects completed on schedule and within budget.

Commitment to Safety

Maintaining strict safety standards to protect both clients and project teams.

Community Support

Actively contributing to and supporting the local community through meaningful involvement.

Innovation

Embracing modern technologies and industry advancements to deliver efficient, innovative results.

Professionalism

Upholding professionalism, respect, and accountability in every interaction.

Our Showrooms, Warehouses And Offices

With showroom locations in Guelph, Glencairn and Wasaga Beach, we proudly provide reliable roofing services across Ontario, backed by experienced craftsmanship, trusted customer support, and comprehensive product and workmanship warranties.

• 3 Showrooms

Guelph (519) 836-0000

Wasaga Beach (705) 352-5552

Glencairn (705) 466-9997

How Our Roofing Process Works

We follow a professional and transparent roofing process to ensure clear communication, quality workmanship, and a smooth experience from start to finish.

Trusted Roofing Brands

View website

View website

View website

What Our Customers Say

Chris Walker

I recently had my roof replaced and the whole experience went really smoothly. The crew showed up on time, kept everything clean, and finished the job quicker than I expected. At first, it felt a little strange handling such a big project mostly over phone calls and emails, but communication was great the entire time. The pricing was also very fair compared to other companies I spoke with, and overall I’m really happy with the work.

Benjamin Robert

Earlier this year, my asphalt roof was damaged by hail, so I started looking into a more durable long-term option and decided to go with metal roofing. I reached out to Global Alliance, and honestly, they made the whole process really easy from start to finish. The crew was professional, worked efficiently, and the installation turned out great. The new roof looks amazing, and I’ve already noticed better insulation and a cooler attic compared to my old shingles. I’m really happy with the result and would definitely recommend Global Alliance to anyone thinking about replacing their roof.

Jason Miller

I recently had a stone-coated steel roof installed and honestly couldn’t be happier with how everything turned out. The team kept me updated throughout the whole project, answered my questions quickly, and finished everything right on schedule. The crew did a great job with both the installation and cleanup, and the new roof looks fantastic. I’ve already had a few neighbors compliment it, and I’d definitely recommend Global Alliance to anyone looking for a new roof.

Daniel Carter

Everyone at Global Alliance was friendly, professional, and easy to work with. The crew stayed on schedule, kept us updated throughout the project, and answered our questions quickly. Overall, the whole process was smooth and stress-free.

Jason Miller

Working with Global Alliance was a really great experience. Their team inspected our roof, helped us through the insurance claim process, and made everything simple and stress-free. We chose a hurricane shake metal roof, and the final result looks amazing. The workmanship was excellent, and we’re extremely happy with how everything turned out. We’d definitely recommend Global Alliance to anyone needing a new roof.

Kevin Marshall

I spent a lot of time comparing different roofing options and companies before choosing Global Alliance, and honestly, I’m really glad I did. The crew showed up on time, worked hard every day, and were easy to deal with throughout the whole project. Everything was handled exactly the way they promised, and the new roof turned out even better than I expected. I absolutely love it.

Frequently Asked Questions

• Limited-time roofing offers

Get A Free Roof Estimate

SAVE UP TO 30%

6-MONTH FINANCING

• Professional inspection of all roof components
• Transparent evaluation with no pressure to upgrade
• Fast turnaround on quotes and scheduling

Get a Free Estimate