Custom homes and cottage construction and renovations in Port Severn and the South Georgian Bay area. Quality craftsmanship with outstanding personal customer service.

Since 1968, Mulholland Construction Company has been building and renovating homes and recreational properties throughout the South Georgian Bay area. Centrally located in Port Severn, Ontario, we service an area from Simcoe County in the south, to Muskoka in the north.


Build your custom dream home on your lot or property. From planning to finish, let us show you how, every step of the way.
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Major renovations, additions, fixer uppers, tear-downs. We can help turn your house into the home you always wanted.
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A new kitchen or bathroom can bring life back to your home, cottage or chalet, and increase the value of your property.
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Custom home construction
With a focus on quality craftsmanship, attention to detail and outstanding customer service, Mulholland Construction has become one of the South Georgian Bay area’s most trusted general contractors.

Every new building or renovation project begins with a good conversation. We believe that the initial meeting creates the solid foundation to build upon. We will meet with you, listen to your ideas, and provide valuable insight into helping you make your dream come true.

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50 years of quality craftsmansip and outstanding customer service
We build relationships with our clients. Relationships built on integrity, professionalism, communication and delivering on time and on budget.

“Built in 1862, this downtown structure had “good bones” but was in need of repairs and upgrades. What started as a discussion about renovating a kitchen and updating a downstairs bathroom, turned into the incredible total transformation of one of Collingwood’s oldest historic residences…delivered on budget and on time by a craftsman who clearly loves what he does for a living. Ian Mulholland worked with me to put together a plan to take the entire home down to the studs and bring it back to life again. Ian is a master builder with a creative flair that lets him create elements that will greatly enhance any construction or renovation project.” Paul, Collingwood

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