--- title: "ADU Construction in Granite Bay, CA | TDI®" description: "ADU builder in Granite Bay, CA: detached and attached ADUs, garage conversions and junior ADUs. Permits handled, free estimates. Call (916) 259-7848." url: https://www.tdiusa.com/service-areas/granite-bay-ca/adu-construction/ --- ![TDI® crew framing the interior of an accessory dwelling unit in Sacramento](https://www.tdiusa.com/images/services/general-contractor.webp) Granite Bay, CA · ADU Construction # ADU Construction in Granite Bay ADU builder in Granite Bay, CA: detached and attached ADUs, garage conversions and junior ADUs. Permits handled, free estimates. Call (916) 259-7848. [📞 Call (916) 259-7848](tel:+19162597848) [All Services in Granite Bay](https://www.tdiusa.com/service-areas/granite-bay-ca/) Our technicians serve Granite Bay and are typically on-site within 60 minutes of your call. An accessory dwelling unit (ADU) adds a complete, permitted living space on the lot you already own: room for aging parents or grown kids, a home office, or rental income that helps cover the mortgage. TDI® builds ADUs in Granite Bay and across Placer County, and manages each project from the first site review to the final inspection under one contract. ## ADUs we build in Granite Bay - **Detached ADUs**, a standalone backyard cottage with its own foundation, kitchen, bathroom and entrance - **Attached ADUs**, a new unit built onto the existing home with its own entrance - **Garage conversions**, turning an attached or detached garage into a full living unit - **Junior ADUs**, up to 500 square feet carved out of existing space inside the home, with an efficiency kitchen and a separate entrance - **Above-garage units**, where the lot and local rules allow it ## Building an ADU in Granite Bay Granite Bay is an unincorporated community in Placer County near Folsom Lake, known for custom homes on large lots, some on septic systems. Many Granite Bay parcels have the room for a detached ADU set well back from the main house. On larger lots we look at access for equipment, the length of utility runs and, where the property is on a well or septic system, whether the system can serve a second unit or needs an upgrade. The county’s environmental health review is part of the permit path when septic is involved. Newer homes usually have more electrical and plumbing capacity to work with, which can simplify the utility connections for a new unit. We still verify the panel size and the sewer and water connections before design is final. Many Granite Bay neighborhoods have an HOA. Under California law an HOA cannot prohibit an ADU, but it can apply reasonable standards for things like materials and appearance, so we review your CC&Rs and plan for architectural review alongside the building permit. Foothill properties see hot summers, more winter rain than the valley floor, occasional snow at higher elevations, and wildfire-area building rules for exteriors. We design ADUs to California Title 24 energy standards, with insulation, window placement and a properly sized heating and cooling system so the unit stays comfortable year round. ## How an ADU project works with TDI® 1. **Site and zoning review.** We look at your lot, setbacks, utilities and access before anything is drawn, so the design fits what can be permitted. 2. **Design and drawings.** We coordinate floor plans and construction drawings sized to your goals and budget. 3. **Permits and plan check.** We submit the application to Placer County’s Community Development Resource Agency, answer plan check comments and track the permit through approval. 4. **Construction.** Foundation, framing, roofing, plumbing, electrical and HVAC, insulation to Title 24, then drywall, cabinets, fixtures, flooring and finishes. 5. **Final inspection and walkthrough.** We close the permit and walk the finished unit with you, so you have a legal, insurable, rentable space. ## Licensed and accountable - **CSLB licensed general contractor**, License #1041773, Class B General Building - **Native American owned (Cherokee)** and a certified Minority Business Enterprise - **Building in Northern California since 1983** Thinking about an ADU in Granite Bay? Call us for a site review and a free written estimate. Serving Granite Bay — ★ 5.0 · 9 Google reviews > “Thank you Alex for answering my questions.” — Marie, May 2026 Coverage ## ADU Construction in Granite Bay: Service Coverage TDI® Serving Granite Bay and the surrounding area ★★★★★ 5.0 · 9 Google reviews 701 Del Paso Road Suite 200, Sacramento, CA 95834 [(916) 259-7848](tel:+19162597848) 24/7 [📞 Call Now](tel:+19162597848) [Get Directions](https://www.google.com/maps/dir/?api=1&destination=701%20Del%20Paso%20Road%20Suite%20200%2C%20Sacramento%2C%20CA%2095834) ## Frequently Asked Questions How fast can you arrive for adu construction in Granite Bay? We offer 24/7 emergency response and typically arrive on-site in Granite Bay, CA within about 60 minutes of your call — often sooner for active water, fire, or storm damage. Can I build an ADU on my property in Granite Bay? In most cases, yes. California law allows an ADU on lots with a single-family or multifamily home, and many single-family lots can have both a detached or attached ADU and a junior ADU inside the existing house. Projects in Granite Bay are permitted through Placer County's Community Development Resource Agency, and local rules still control details like height, setbacks and utility connections, so we start with a site and zoning review before any drawings are made. How big can an ADU be? Under state law, a junior ADU can be up to 500 square feet and is built within the existing home. Attached and detached ADUs are generally allowed up to 1,200 square feet, though local limits and lot conditions can affect the final size. Units of 750 square feet or less avoid most impact fees, which is why many owners design right at or under that size. Is a garage conversion cheaper than a new detached ADU? Usually. A garage conversion reuses the existing foundation, walls and roof, so the work focuses on the floor, insulation, windows, a kitchen, a bathroom and utilities. A detached ADU needs its own foundation, framing, roof and utility runs. The right choice depends on the garage's condition, your parking needs and how much living space you want. How long does an ADU take to build in Granite Bay? Design and permitting often take two to four months, and California requires local agencies to act on a complete ADU application within 60 days. Construction typically runs two to four months for a garage conversion or junior ADU, and four to eight months for a new detached unit. Is TDI® licensed and insured? Yes. TDI® is a CSLB licensed general contractor (#1041773, Class B General Building), insured for residential and commercial work, and has been building in Northern California since 1983. Will my homeowners insurance cover adu construction in Granite Bay? Often, yes — most homeowners policies cover sudden and accidental damage, though coverage always depends on your specific policy and the cause of the loss. We work with all major insurance carriers, bill them directly, and document the damage with photos and moisture readings so your Granite Bay adjuster has everything needed to process the claim. ## ADU Construction response in Granite Bay Most Granite Bay calls see a technician on-site within 60 minutes of your call. [Call (916) 259-7848](tel:+19162597848) [Get a Free Estimate](https://www.tdiusa.com/contact/#estimate) More Coverage ## Nearby & Related - [Contact TDI®](https://www.tdiusa.com/contact/) - [Construction Services in Granite Bay](https://www.tdiusa.com/service-areas/granite-bay-ca/) - [ADU Construction in Sacramento](https://www.tdiusa.com/services/adu-construction/) - [Garage Construction in Granite Bay](https://www.tdiusa.com/service-areas/granite-bay-ca/garage-construction/) - [Room Additions and Home Additions in Granite Bay](https://www.tdiusa.com/service-areas/granite-bay-ca/room-addition/) - [ADU Construction in Roseville](https://www.tdiusa.com/service-areas/roseville-ca/adu-construction/)