Accessory Dwelling Units (ADUs), also known as granny flats, in-law units, or backyard cottages, have become an increasingly popular solution for homeowners throughout the Peninsula. Whether you’re looking to create extra living space, generate rental income, or accommodate extended family, ADUs offer a flexible and valuable addition to your property. At Dex Construction, we specialize in helping Peninsula homeowners design and build high-quality, compliant ADUs that enhance both function and value.
In this guide, we’ll cover everything you need to know about building an ADU in the Peninsula—from benefits and requirements to design tips and working with the right builder.
What Is an ADU?
An Accessory Dwelling Unit (ADU) is a secondary housing unit located on a single-family or multi-family residential lot. It can be attached to the main home, detached, or a conversion of an existing structure like a garage or basement.
Types of ADUs:
- Detached ADU: A stand-alone structure in the backyard.
- Attached ADU: An addition built onto the main house.
- Interior Conversion: Part of the existing home repurposed, like a basement or attic.
- Garage Conversion: Turning an existing garage into a living space.
Why Build an ADU?
1. Rental Income:
ADUs can generate consistent rental income, making them a smart investment for homeowners.
2. Multigenerational Living:
Many families use ADUs to house aging parents or adult children, providing independence with proximity.
3. Increase Property Value:
An ADU can significantly increase the market value of your home.
4. Flexible Use:
Use it as a home office, guest suite, or even a short-term vacation rental (depending on city regulations).
What Are the Local Regulations in the Peninsula?
California has eased restrictions in recent years, but each city within the Peninsula (e.g., San Mateo, Redwood City, Palo Alto, etc.) may have unique requirements. Here are some general guidelines:
- Maximum Size: ADUs can be up to 1,200 square feet in most cases.
- Setbacks: Usually 4 feet from the side and rear property lines.
- Height Limits: Often capped at 16–25 feet, depending on zoning.
- Parking Requirements: May be waived if the ADU is near public transit or within a historic district.
- Owner Occupancy: Recent state laws have lifted this requirement in many areas.
- Permitting: Building permits and inspections are required and enforced by local planning departments.
At Dex Construction, we’re familiar with city-specific ADU codes and can help you navigate the permitting process seamlessly.
Step-by-Step: How Dex Construction Builds Your ADU
1. Initial Consultation & Site Assessment
We begin with a free on-site evaluation to understand your goals and assess feasibility.
2. Design & Planning
Our team collaborates with architects and drafts custom ADU plans tailored to your needs, while ensuring full compliance with city regulations.
3. Permit Acquisition
We handle all permitting paperwork, saving you time and hassle.
4. Construction Phase
Our skilled builders bring your ADU to life with expert craftsmanship, high-quality materials, and consistent communication.
5. Final Inspection & Handover
Once completed, your ADU will be ready for use—fully inspected and up to code.
Tips for Designing a Functional ADU
- Open floor plans make small spaces feel larger.
- Natural lighting boosts comfort and aesthetics.
- Built-in storage maximizes space efficiency.
- Universal design makes it accessible for all ages and abilities.
- Energy-efficient features reduce long-term utility costs.
Why Choose Dex Construction for Your ADU Project?
With years of experience in the Peninsula, Dex Construction is your trusted local builder for custom ADUs. We understand the nuances of local zoning laws, offer complete design-build services, and are committed to transparent communication and top-tier results.
Ready to Build Your ADU?
Whether you’re just starting to explore the idea or ready to break ground, Dex Construction is here to help. Contact us today for a free consultation and let’s turn your vision into reality.
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🌐 Visit: https://dexbuilderspeninsula.com
📍 Serving: San Mateo, Redwood City, Palo Alto, and surrounding Peninsula areas