Custom Home Builder and General Contractor in Maine
- Custom Home Construction
- General Contracting
- Renovations and Additions
- Energy-Efficient and Net Zero Homes
- Sustainable Building Practices

Energy-Efficient Window
Optimized for passive solar gain — warmth in winter, less glare in summer.
Wood Entry Columns
Handcrafted from sustainably sourced timber, sealed for longevity and natural warmth.
Stone Foundation Veneer
Locally sourced stone, precision-laid for enduring strength and timeless style.
Cedar Siding Cladding
Sustainably sourced cedar with natural insulation and timeless warmth.
Renovations and Home Additions That Fit the Existing Structure
CSM Custom Builders handles major renovations and additions for homeowners who want to improve layout, increase space, or upgrade performance. These projects require careful integration with the existing structure, especially in older Maine homes.
We focus on clean transitions between old and new construction, ensuring the finished result feels cohesive rather than added on.
Energy-Efficient and Net Zero Home Construction
Our work emphasizes building performance. We construct homes that reduce energy demand, improve comfort, and stand up to Maine’s seasonal extremes.
This includes:
- High-performance insulation and air sealing
- Thoughtful building envelope design
- Efficient heating and cooling systems
- Solar-ready and net zero capable construction
- Material selection based on durability and environmental impact







