Our Team

We're a family business proud of our staff of caring, committed craftsmen. These are the faces of the people who'll be helping you make your house goals come to reality.

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David Milliken

Dave started Horizon with his parents and sister, Diane, in 2006, focusing primarily on energy audits and green building certifications. Since then the business has grown and moved from assessing and recommending improvements for home efficiency to contracting the work ourselves. Dave's is the voice you'll hear when you call with questions or seeking help, and his depth of knowledge and experience in building sciences is invaluable. He lives in Cape Elizabeth with his wife Kristie and three young children.

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Nate Howe

Nate joined Horizon in 2010 to help move the business into the contracting sphere. He has spent his life working in construction and green building and has a impressive understanding of homes, inside and out. He's from Cornish and now lives in South Berwick with his wife Kara and two young sons.

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Nate Manning



Luke Patry



Sean Colinson


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Maple Milliken



Tim Walker


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Kristie Green