Best Commercial Roofing Contractors in Calgary

Commercial and industrial roofing in Calgary covers offices, retail centres, warehouses, and multi-unit buildings — most using low-slope membrane systems such as TPO, EPDM, and modified bitumen. The 6 contractors below were selected from our full Calgary top 10 as the strongest for commercial work, ranked by experience, manufacturer certifications, BBB standing, and verified reputation.

Calgary's commercial roofing market is defined by two climatic forces that rarely coexist elsewhere: Alberta's severe hailstorm season and the chinook cycle that delivers dramatic single-day temperature swings through autumn, winter, and spring. Commercial flat roofs must handle both the impact energy of large hailstones and the membrane fatigue generated by repeated rapid thermal cycling. Systems selected without accounting for both factors tend to fail at seams and penetrations within years rather than decades.

Alberta's Safety Codes Act governs commercial construction including roofing, and Calgary's municipal permit process applies on top of provincial requirements. Commercial roofing projects above defined scope thresholds require a permit, and work affecting the building envelope triggers energy compliance review under the National Energy Code for Buildings. In Calgary's hail corridor, insurance documentation requirements have become increasingly detailed — many commercial property insurers now specify the hail impact rating of replacement membrane systems as a condition of coverage renewal, making product selection a pre-contract conversation rather than a contractor discretion.

How many commercial roofing contractors are in Calgary?

Our directory lists 6 independently verified commercial roofing contractors serving Calgary, Alberta, ranked by experience, certifications and reputation. CMP Roofing is ranked #1. There are no paid placements.

How do I choose a commercial roofer in Calgary?

Confirm licensing and insurance for Alberta, ask for commercial project references in Calgary, get multiple written quotes, and check each contractor's BBB standing. Every company listed here has been independently researched.

What membrane systems are most commonly specified for Calgary commercial flat roofs?

TPO and EPDM single-ply membranes dominate new commercial installations in Calgary, with modified-bitumen systems remaining common on reroofing projects where existing multi-ply assemblies are retained as a base. For hail exposure, membrane thickness matters: thicker TPO membranes offer better impact resistance than thinner ones and are increasingly specified in Calgary's hail corridor. Two-ply modified-bitumen assemblies are also hail-resistant options worth discussing with your consultant.

Does Calgary's chinook cycle affect how quickly commercial flat-roof repairs should be made?

Yes. Chinook events create rapid thermal expansion that can widen small membrane cracks and open seam separations that might otherwise remain stable. Temporary repairs made in cold temperatures may fail when the next chinook arrives and brings rapid warming. Commercial roofing specialists familiar with Calgary's thermal cycle design temporary repairs — and permanent ones — with that movement in mind.

What permits are required for commercial reroofing in Calgary?

Development and building permits from the City of Calgary apply to commercial re-roofing projects meeting defined scope and value thresholds. The permit process involves plan review to confirm compliance with the National Building Code and Alberta Amendments, and a site inspection upon completion. For projects involving structural changes — such as adding a rooftop mechanical penthouse or converting to a green roof — engineering documentation is typically required as part of the permit application.