500 SF JADU in Vallejo
This project reconfigures part of the existing single-family home into a 500-square-foot junior accessory dwelling unit (JADU), adding a code-compliant rental suite while keeping the primary residence intact.
Underutilized interior space with no separate living suite
The original home had continuous interior space with no separation for a self-contained unit—no independent kitchenette, no private entry, and limited sound and fire separation. The homeowners wanted to introduce a JADU within the main house to generate rental income while preserving privacy and everyday comfort for both households.
Interior without separation for a self-contained JADU.
Backyard area prior to the JADU conversion.
Non-compliant room layout before the JADU build.
Interior reconfiguration with code-compliant JADU separation
The JADU reuses existing conditioned space to control construction cost while introducing an independent entry, kitchenette, and bath, all aligned with California JADU regulations.
We upgraded fire separation, sound insulation, and egress to clearly distinguish the JADU from the main residence, protecting privacy and life safety for both occupants.
By keeping most structural walls in place and focusing on precise interior planning, the design delivers a high-value rental suite with minimal disruption to the primary home.
3D layout showing the 500 SF JADU plan.
Layout plan with kitchenette and full bath for the JADU.
Zoning diagram separating JADU and primary residence.
A self-contained JADU within the main home
The new 500 SF JADU offers a modern, light-filled living area with its own kitchenette, bathroom, and storage, enabling rental income or multi-generational living without sacrificing the comfort of the primary residence.
Rental-ready JADU with strong neighborhood demand
By converting interior space into a junior accessory dwelling unit, the homeowner adds a second income-generating unit without expanding the building footprint, aligning with Vallejo JADU regulations and California state law.
Estimated monthly rent for a 500 SF JADU in the Vallejo area.
Interior JADU conversion can significantly increase resale value.
Reusing existing structure reduces cost compared to a new detached ADU.
Beyond the Numbers
Second unit without new footprint
Creates a separate living suite while preserving the existing site and yard.
Code-aligned JADU separation
Fire, sound, and egress upgrades bring the interior conversion in line with JADU requirements.
Efficient use of existing systems
Taps into existing utilities where feasible, reducing construction complexity and cost.
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