Cornwall · Long Sault · Ingleside
Building Cornwall homes that stand for generations.
HCRA-licensed builder and full-service contractor serving Cornwall and Eastern Ontario since 1997. From custom new builds to bathroom renovations — one team, every step.
HCRA Licensed Builder
Cornwall, Ontario · Since 1997
Who we are
A trusted Cornwall construction company.
Windmill Construction Ltd. is a family-run, HCRA-licensed builder based in Cornwall, Ontario. For over 25 years we've delivered custom homes, additions and renovations across Stormont, Dundas & Glengarry — one quality build at a time.
What we do
One team. Every part of the build.
From the first sketch to the last coat of paint, we handle every trade and every detail — so you only have one number to call.
01 New Home Construction
Custom Cornwall homes designed and built end-to-end — from initial sketches to the final coat of paint.
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02 Project Management
Professional construction oversight across every trade — so you don't have to coordinate any of it yourself.
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03 Garage Construction
Attached, detached, single, double, workshop or storage — designed for how you actually use the space.
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04 Home Additions
Sunroom, mudroom, master suite, second-storey, rental unit — every addition feels like it's always been part of the home.
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05 Kitchen Renovations
Simple design refresh or top-to-bottom rebuild — the kitchen of your dreams, built right.
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06 Bathroom Renovations
One of the smartest renovations you can make — done properly, on time, and on budget.
Learn moreWhy Windmill
Three reasons clients choose us — and stay with us.
We've done this before.
More than 25 years of experience building quality homes across Cornwall and Eastern Ontario means there isn't much we haven't seen — and there isn't much we can't solve.
Big jobs. Small jobs. All of them.
New custom homes, additions, kitchens, bathrooms, garages, commercial and industrial — including ICF supply and installation. One contractor for the whole project.
Built above code.
Every Windmill project is built above and beyond Ontario building code requirements. We handle the permits, the trades and the timeline — so you don't have to.
Home Construction Regulatory Authority
An HCRA Licensed Builder since 1997.
In Ontario, only HCRA-licensed builders are legally permitted to build new homes. The Home Construction Regulatory Authority (HCRA) regulates new home builders and vendors, setting the professional standards that protect homeowners. Windmill has held a licence in good standing for over two and a half decades.
More about our credentials
Why Windmill
Honesty, integrity and quality — on every job.
Our promise is simple: build community value into every project, deliver professional expertise, and give every client the kind of service we'd want on our own home. That's the formula that's earned us our reputation in Cornwall, and it's how we win every new project.
- HCRA-licensed, fully insured residential builder
- Permit applications handled in-house
- On time, on budget, above code — every build
- Insulated Concrete Form (ICF) supply and installation
Testimonials
A reputation we've spent 25 years earning.
I wanted to take a moment and express our appreciation to the Windmill Construction team. Renovations of any sort can be stressful — as a business owner going through one, it could have been very disruptive and costly. The professionalism of your company, the positive attitude and work ethic of your staff, your flexibility around our store hours, and the exceptional quality of workmanship made our renovation experience a positive one. Henry — your ability to address every change and unforeseen challenge while adhering to the schedule was key to this project's success. Throw in a balanced budget and we'd like to say: you nailed this project.
A lot of companies claim the old adage 'no job is too big or too small' — but with Windmill Construction they truly mean it. I have used them for many years for a variety of jobs — from patio walkways and design suggestions to full excavations and complete kitchen renovations. They did an outstanding job on a double garage they built for me. The Windmill team approaches every job with the same commitment to quality and customer service. I appreciate their honesty, integrity and the information they provide me to make informed decisions about my renovations. I can count on them to ensure the job is done on time, within budget, and to my complete satisfaction.