ADU Construction in Granite Bay

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.