ADU in San Jose CA

ADU Builders & Luxury ADU Construction in San Jose and the Peninsula

MRV Construction is an ADU contractor specializing in luxury ADU development and mother in law suite projects across San Jose, Atherton, and the Peninsula. As a custom ADU contractor, we manage every phase of ADU construction, from SB-9 compliance to complex site engineering in Portola Valley and Menlo Park. Led by Marcelo and Jesus Rodriguez, our team provides the technical oversight required for detached, attached, and garage-converted accessory units.

Make It

Navigating Local ADU Regulations in the Silicon Valley

Effective ADU builders must account for the vastly different building codes across the 101 and 280 corridors. MRV Construction operates with a deep understanding of these municipal nuances to ensure your project moves through the plan check process without structural revisions.

San Jose: High-Density & SB-9

As one of the best ADU contractors in San Jose, we help homeowners leverage California’s SB-9 laws to maximize lot utility. San Jose’s ADU Universal Checklist allows for streamlined approvals if the design utilizes pre-approved plans or meets specific "standard plan" criteria for detached units.

Atherton & Portola Valley: Estate Standards & WUI

In these jurisdictions, ADU construction often involves larger footprints but stricter aesthetic and safety mandates.

  • WUI Compliance: Projects in Portola Valley must adhere to strict fire-safe building materials and defensible space requirements.

  • Setback & FAR: Atherton maintains rigorous Floor Area Ratio (FAR) calculations that require precise architectural planning for a luxury ADU.

Menlo Park & Belmont: Transit-Oriented Development

For homeowners near transit corridors, we manage the specific parking exemptions and height limit allowances that can increase the living area of your mother in law suite.

Our Custom ADU Construction Process

As your custom ADU contractor, MRV Construction follows a rigorous path to completion:

  1. Site & Utility Audit: We analyze existing sewer, water, and electrical capacity to determine if upgrades are needed to support a new luxury ADU.

  2. Architectural & Structural Design: We develop plans that balance your aesthetic goals with the structural requirements of the 2022 California Building Standards Code.

  3. Permit Management: We handle the submission and "Plan Check" responses for all municipal building departments, including the unique architectural review boards in the Peninsula.

  4. Ground-Up Construction: From foundation pouring to high-end interior finishes, our crews manage the full build-out of your secondary residence.

Official City & County ADU Resources

We encourage homeowners to review the official planning guidelines for their specific jurisdiction:

ADU Project Feasibility

ADU Type - Permitting Lead Time - Construction Duration

Garage Conversion 12–24 Weeks 3–5 Months

Detached Custom ADU 20–40 Weeks 6–9 Months

Attached Addition 16–36 Weeks 5–8 Months