Jeff Martinez Construction

Jeff Martinez Construction Inc. is a licensed, owner-operated general contractor based in Oakley, California, proudly serving homeowners throughout Contra Costa County and surrounding communities. With over 27 years of construction experience, the company specializes in Accessory Dwelling Units (ADUs), custom homes, home additions, remodeling, outdoor living spaces, framing, foundations, and residential renovations. Jeff Martinez Construction has built its reputation on quality craftsmanship, hands-on owner involvement, and transparent communication from project planning through completion.

Operating as a full-service design-build contractor, the company guides homeowners through every phase of the ADU process, including property consultation, custom planning, permit acquisition, site preparation, foundation work, framing, mechanical systems, and interior finishes. Their extensive knowledge of Contra Costa County building codes and California ADU regulations helps streamline permitting while delivering durable, energy-efficient living spaces tailored to each client’s needs.

Services

• Accessory Dwelling Units (ADUs)
• Detached ADUs
• Garage Conversions
• Home Additions
• Custom Home Construction
• Home Remodeling
• Foundation Construction
• Structural Framing
• Door Installation
• Window Installation
• Siding Installation
• Deck Construction
• Outdoor Renovations
• Landscape Integration
• Interior Finishing
• Exterior Finishing
• Permit Coordination
• Design-Build Services
• Project Management
• Residential General Contracting

Why Choose Jeff Martinez Construction Inc.?

• Over 27 years of construction experience
• Owner-operated company with direct project oversight
• Complete design-build ADU services
• Licensed and insured California contractor
• Specialists in custom ADUs and home additions
• Handles permits and local code compliance
• High-quality materials and proven construction methods
• Energy-efficient and durable construction
• Free estimates
• Military and senior discounts available