General Contractors in Sarnia, ON
Find and compare top-rated general contractors serving Sarnia and surrounding Lambton County communities.
Showing top verified contractors serving Sarnia across Lambton County.
Whether you are planning a home addition, a basement finish, or a major renovation, finding the right general contractor in Sarnia is the most important decision you'll make. With 95 general contractors listed for the Lambton County area, you can compare experienced professionals who manage everything from permits and subcontractor coordination to finishing touches. A skilled GC acts as your project manager — handling scheduling, trades, inspections, and quality control so you don't have to. Before hiring, always verify proof of general liability insurance, WSIB clearance, and references from recent comparable projects. Browse listings, read reviews, and request free consultations from 95 general contractors serving Sarnia and surrounding Lambton County communities.
McNally Excavating Ltd.
McNally Excavating Ltd. is a premier heavy civil construction contractor based in Inwood, Ontario, serving Lambton County, Chatham-Kent, Elgin County, and Middlesex County across Southwestern Ontario. With years of industry expertise and a strong local footprint, the company delivers high-quality infrastructure and earthmoving solutions for municipal, commercial, and agricultural developments. As an ISNetworld member, McNally Excavating maintains rigorous standards of health, safety, and corporate compliance across all its job sites. The firm offers a comprehensive suite of civil engineering capabilities, including sewer and watermain installation, full-scale site preparation, street reconstruction, and industrial, commercial, and institutional (ICI) siteworks. From precast box culverts and municipal tile drainage systems to bridge replacements and ditch maintenance, McNally Excavating Ltd. leverages advanced equipment and skilled personnel to complete complex infrastructure projects with precision.
Professional general contractors serving Lambton County and surrounding areas. Contact us today for a free estimate.
Thompson Construction Ltd
Professional general contractors serving Lambton County and surrounding areas. Contact us today for a free estimate.
KNK Mechanical Group
K.N.K. Mechanical Group is a premier multi-trade mechanical contractor based in Sarnia, Ontario, serving industrial clients across Ontario and North America. Specializing in the oil, gas, and power generation sectors, the company delivers comprehensive mechanical solutions backed by a team of highly skilled, union-qualified tradespeople including millwrights, boilermakers, and pipefitters. Driven by an unyielding commitment to safety, precision, and quality workmanship, K.N.K. Mechanical Group provides reliable on-time and on-budget project execution. From large-scale industrial construction general contracting and commissioning to routine facility maintenance, fabrication, and precision alignment, the company combines industry-leading safety standards with advanced technology to meet critical project needs.
Johnson Wm Constrn Ltd
Professional general contractors serving Lambton County and surrounding areas. Contact us today for a free estimate.
Frequently Asked Questions — General Contractors in Sarnia
How do I verify a general contractor is legitimate in Ontario?
Ask for proof of general liability insurance and WSIB coverage, check for any trade licences required for the work (electrical, plumbing, gas), verify their business registration, and request references from recent projects in Sarnia or the surrounding Lambton County area.
Do I need a building permit for my renovation in Sarnia?
Most structural renovations, additions, and significant interior changes require a permit from your local municipality. A reputable general contractor will know what permits are needed and will pull them on your behalf before work starts.
How much does a home renovation cost in Sarnia?
Renovation costs vary enormously by project scope. A kitchen or bathroom refresh might run $10,000–$30,000; a full addition or basement finish can range from $50,000 to $200,000+. Always get a minimum of three written quotes and confirm what is and is not included.
What should a contractor's written contract include?
A solid contract should specify the scope of work in detail, materials and brands to be used, start and end dates, payment schedule tied to milestones, warranty on workmanship, and a process for handling changes or overruns. Never pay more than 10–15% upfront.