Koeppen Construction

Koeppen Construction is a residential construction company based in Longmont, Colorado, specializing in the design and construction of Accessory Dwelling Units (ADUs), custom homes, home additions, and outdoor living spaces. The company helps homeowners maximize the value and functionality of their properties by creating thoughtfully designed ADUs for rental income, multigenerational living, guest accommodations, and home offices. With a focus on craftsmanship, communication, and personalized service, Koeppen Construction delivers projects tailored to each client’s unique needs.

Operating under a design-build approach, Koeppen Construction guides homeowners through every phase of the ADU process—from the initial consultation and custom housing plans to permitting assistance, construction, inspections, and project completion. Their team emphasizes practical design, quality materials, and efficient project management, ensuring every ADU complies with local regulations while blending seamlessly with the existing property.

Services

• Accessory Dwelling Units (ADUs)
• Detached ADUs
• Attached ADUs
• Garage Conversion ADUs
• Custom ADU Design
• ADU Housing Plans
• Site Evaluation
• Permit Assistance
• Construction Management
• Custom Home Construction
• Home Additions
• Outdoor Living Spaces
• Deck Construction
• Patio Construction
• Residential Remodeling
• Design-Build Services

Why Choose Koeppen Construction?

• Dedicated ADU design-build contractor
• Complete planning, permitting, and construction services
• Custom-designed ADUs tailored to each property
• Specialists in detached, attached, and garage conversion ADUs
• Experienced with Colorado building requirements
• Personalized project management
• High-quality craftsmanship
• Clear communication throughout the project
• Solutions for rental income and multigenerational living
• Free project consultations