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It can be difficult to find a reliable roofing contractor who does high-quality work. One thing to look into is whether the contractor has been certified by a major roofing manufacturer.

Most reputable roofing manufacturers require that the roofing contractor who installs their products be a manufacturer-approved contractor; otherwise, they will not issue a warranty for the work.

Contractors who feel confident in the high quality of their work will often go the extra mile and become manufacturer-certified. The process for becoming certified normally includes applicator training programs run by the manufacturer’s technical department, a required minimum number of years of roofing experience, and inspections of actual roofs installed by the contractor.

You can reason that if the roofing manufacturer trusts these contractors to perform the work to a high standard (so the manufacturer won’t end up losing money on warranty issues), then you can trust them, too.

(This, of course, is not always the case, and we are not endorsing any of the contractors you find through these links.)

The following list provides links to the databases of approved contractors of the major roofing manufacturers. These databases are generally searchable by zip code, so you can find a contractor near you.

Residential Roofing Manufacturers

Atlas Roofing Corporation

Products: Asphalt Shingles

Atlas Roofing Approved Contractor List

Building Products of Canada

Products: Asphalt Shingles

BP Canada Approved Contractor List


Products: Asphalt Shingles, Metal Roofing

CertainTeed Approved Contractor List


Products: Asphalt Shingles, Slate Roofing

GAF Approved Residential Contractor List

IKO Industries

Products: Asphalt Shingles

IKO Approved Contractor List

Malarkey Roofing Products

Products: Asphalt Shingles

Malarkey Approved Residential Contractor List

Owens Corning

Products: Asphalt Shingles

Owens Corning Approved Contractor List

TAMKO Building Products

Products: Asphalt Shingles, Steel Shingles

TAMKO Approved Contractor List

Commercial Roofing Manufacturers

Carlisle SynTec

Products: EPDM Roofing Systems, PVC Roofing Systems, TPO Roofing Systems

Carlisle SynTec Approved Contractor List

Firestone Building Products

Products: EPDM Roofing Systems, TPO Roofing Systems

Firestone Approved Contractor List


Products: Built-Up Roofing Systems, Modified Bitumen Roofing Systems, PVC Roofing Systems, TPO Roofing Systems

GAF Approved Commercial Contractor List

Johns Manville

Products: Built-Up Roofing Systems, EPDM Roofing Systems, Modified Bitumen Roofing Systems, PVC Roofing Systems, TPO Roofing Systems

Johns Manville Approved Contractor List

Sika Sarnafil

Products: PVC Roofing Systems

Sika Sarnafil Approved Contractor List