T2Architects designs accessory dwelling units for homeowners and property owners throughout the San Francisco Bay Area and Northern California. We help evaluate properties, develop ADU concepts, prepare architectural drawings and coordinate the documentation needed for permitting and construction.
What is an ADU?
An Accessory Dwelling Unit as permitted by California State laws since 2016
Does my property qualify for an ADU?
Yes
How much does an ADU cost?
Allow Hard Cost: $275-350 /s.f. for standard construction and minimum site work
Soft Cost: All design and permit fees Approx. 18-20% of Hard Cost
How large can an ADU be?
500 s.f. for JADU, up To 1200 s.f. for ADU
How long does an ADU take?
9-12 months
Does T2Architects handle permitting?
Yes
Can an ADU be designed for rental income?
Yes
Attached vs. detached ADUs
There are pros and cons depending on available space
ADU design considerations
Access path, adequate separation for privacy, separate utility services,
The proper size for the lot, What’s beyond the fence in the neighbor’s yard
are a few things worth examine.
ADU EXAMPLES




ADU's
1. Accessory Dwelling Units-
650-1000 s.f, 150-350 s.f. deck to extend useful outdoor living space.
2. New Construction & Addition-Custom
Design- from traditional to modern to fit your needs. Site build or optional prefab to take advantage of shorter construction time, better quality control, more energy efficiency, and clean, modern aesthetics.





Napa ADU 750 s.f.
Cost:$275K approx. at time of construction
2 bed, open living area, shares open yard with main house.
Feature:
- solar panels
- maximize rental income
- mini split system for heating and cooling