Building an ADU is one of the most valuable upgrades a homeowner can make. At HBC Construction, we design and build Accessory Dwelling Units that enhance lifestyle, maximize space, and increase long-term property value. Whether you want a rental-ready unit, a private guest suite, or a functional living space for family, our team creates ADUs that blend modern design with efficient layouts.
We handle the complete ADU process — architectural planning, permitting, engineering, site prep, construction, utilities, and final finishes. Every ADU is built to California building standards with durable materials, energy-efficient systems, and clean craftsmanship. From garage conversions to standalone backyard units, we deliver ADUs that are beautiful, functional, and built to last.
Every property has different needs — which is why each ADU we build is planned carefully to align with your layout, budget, and goals. HBC Construction offers complete ADU development services including structural upgrades, foundation work, framing, plumbing, electrical, HVAC, roofing, interior finishes, and accessible design options.
Whether you’re adding new appliances, modern smart-home features, stylish interiors, or custom exterior designs, we ensure your ADU integrates seamlessly with your main property. Our team specializes in maximizing small spaces, improving usability, and ensuring your ADU meets all zoning, height, and setback requirements.
ADUs require strong technical knowledge and compliance with California’s evolving regulations. Our certified ADU builders have extensive experience working on attached ADUs, detached ADUs, garage conversions, and multi-unit layouts.
From soil prep to final inspections, we follow strict construction standards to deliver safe, durable, and high-quality projects. Our experience working on complex properties — hillside lots, limited-access spaces, sloped yards, and older homes — allows us to complete ADUs efficiently and correctly.
We ensure your ADU is fully powered, structurally sound, and built for long-term performance.
ADU construction provides the opportunity to upgrade your property with energy-efficient systems, modern insulation, balanced utility distribution, and strong safety features. Whether your home has outdated wiring, old plumbing, or foundation limitations, we address structural or mechanical challenges early to avoid delays and ensure long-term safety.
Your new ADU will feature durable components, modern ventilation, proper drainage, updated electrical service, and code-compliant installations that support daily living. We focus on reliability, quality, and comfort — ensuring your ADU enhances your home and lifestyle.
Get expert support from builders who prioritize quality, design, and efficiency. HBC Construction is here to help with ADU planning, architectural design, permits, engineering, and construction from start to finish.
hilldeleon58@gmail.com
+1 650-444-2017
41060 High St, Fremont, CA 94538, United States