Eighteen Oaks Construction: Your Monterey County ADU Specialist

What is an ADU or JADU?

Accessory Dwelling Units (ADUs) and Junior ADUs (JADUs) are one of the best ways to add flexible, livable space to your property in Monterey County. Whether you’re looking to create housing for family, generate rental income, or simply make better use of your existing space, we help guide you through the process from start to finish.

We design and build both ADUs and JADUs, including garage conversions, attached additions, and detached units. Every project is tailored to your property, your goals, and the local regulations that come with building in Monterey County.

Why Build an ADU or JADU?

Homeowners choose ADUs and JADUs for all kinds of reasons: housing aging parents, giving adult kids their own space, creating a long-term rental, or adding value to their home. With California’s ADU-friendly laws, building has become more accessible than ever, but navigating zoning, permits, and design still takes experience.

That’s where we come in.

Our Approach

As a boutique construction company, we take a hands-on, personalized approach. We start by understanding what you want to use the space for, then help determine what’s feasible on your property. From early planning and permitting to construction and final details, we handle the process so you don’t have to juggle multiple contractors or guess your way through the rules.

We’re familiar with local jurisdictions throughout Monterey County and work closely with designers and inspectors to keep projects moving smoothly.

ADU & JADU Services Include:

  • Detached ADUs

  • Attached ADUs

  • Garage and existing space conversions

  • Junior ADUs (JADUs)

  • Design coordination and planning support

  • Permitting and local code compliance

  • Full construction and project management

Built for How You Live

No two properties, and no two families, are the same. We focus on creating ADUs and JADUs that feel intentional, comfortable, and well-integrated with your existing home. Our goal is to build spaces that don’t just check a box, but truly work for the way you live.

If you’re considering an ADU or JADU in Monterey County, we’d love to talk.

Get In Touch: Plan Your ADU/JADU

If you're interested in setting up an ADU/JADU planning meeting, complete the form with a few details about your project. We'll review your message and get back to you within 48 hours.