ADU Knowledge
July 1, 2024

How to Build an ADU in Evergreen, San Jose

Argi Avetisyan
Argi Avetisyan
Gather ADU expert
How to Build an ADU in Evergreen, San Jose
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Building an ADU in Evergreen, San Jose can be a great way to add value to your property. However, the process can be complicated and time-consuming. This guide will walk you through everything you need to know, from understanding local regulations to choosing a reliable contractor. We'll also provide tips on design and maximizing space and outline the benefits of an ADU.

Understanding ADUs and Their Benefits

Accessory dwelling units (ADUs) are secondary housing units on a single-family residential lot. These units can serve various purposes, such as rental income, guest housing, or additional living space for family members. In Evergreen, San Jose, ADUs are becoming increasingly popular due to their flexibility and potential for adding property value.

Benefits of Building an ADU

  1. Increased Property Value: Adding an ADU can significantly boost your home's market value.
  2. Rental Income: ADUs can provide a steady stream of rental income, making them a smart investment.
  3. Flexible Living Arrangements: Whether you need space for aging parents, college-aged children, or guests, an ADU offers versatile housing solutions.

Local Regulations and Zoning Laws

Before you start planning your ADU, it's crucial to understand the local regulations and zoning laws in Evergreen, San Jose.

Zoning Requirements

San Jose has specific zoning laws that govern where and how ADUs can be built. Before starting your project, check your property's zoning to ensure ADUs are allowed.

Size and Setback Restrictions

The size of your ADU and its placement on your property will be subject to city regulations. These rules often depend on your lot size and existing structures.

Permitting Process

Obtaining the necessary permits is critical. San Jose has streamlined the ADU permitting process, but you must submit complete and accurate documentation.

Planning and Designing Your ADU

Planning and designing your ADU requires careful thought and consideration.

Budgeting and Financing Options

ADU costs can range from $80,000 to $250,000, depending on size, type, and existing utilities. Some homeowners may qualify for the CalHFA ADU Grant, which can provide up to $40,000 towards construction costs. Home Equity Lines of Credit (HELOC) are also a popular financing option.

Choosing a Design

When planning your ADU, consider how the space will be used. Design choices should reflect the needs of potential occupants and complement the main residence. Hiring an experienced builder familiar with San Jose's regulations can ensure your project meets all requirements and maximizes functionality and aesthetics.

Hiring an Architect or Designer

You'll need to hire an architect or designer to create plans for the structure. Alternatively, you can use a reputable ADU prefab company with experience in your county. The plans must meet all local building codes and include details such as materials, windows, doors, bedrooms, and bathrooms.

Finding the Right Contractor

Selecting the right contractor is crucial for a successful ADU project. Look for builders with specific experience in ADU projects in San Jose, like May Construction. They should be familiar with local building codes and the permitting process.

Contractor Credentials

Ensure your contractor is licensed and insured. Check their credentials and reviews to ensure they have a good reputation.

Get Multiple Quotes

Don’t settle for the first contractor you find. Obtain multiple quotes to compare prices and services.

Review Contracts Carefully

Read the contract thoroughly before signing. Ensure it includes timelines, costs, and scope of work.

The Construction Process in Evergreen, San Jose

ADU in Evergreen, San Jose

Once permits are obtained and designs are finalized, construction can begin. A typical ADU project in San Jose can take several months to over a year, depending on complexity and scale.

Site Preparation

The first step is preparing the site, including clearing the land and setting foundations.

Building the Structure

Construction involves framing, plumbing, electrical work, and finishes. Regular inspections ensure the project meets all code requirements.

Final Inspections

Once construction is complete, final inspections are necessary before receiving a Certificate of Occupancy (CO). This certificate is required before anyone can live in the ADU.

Maximizing Space and Functionality

Making the most of your ADU's space is crucial for comfort and usability.

Open Floor Plans

Open floor plans can make small spaces feel larger and more inviting.

Multi-Functional Furniture

Consider using furniture that serves multiple purposes, such as sleeper sofas or fold-out tables.

Storage Solutions

Incorporate smart storage solutions, like built-in shelves and under-bed storage, to maximize space.

Cost Considerations and Financing Options

Understanding the cost and financing options for your ADU is essential.

Cost Breakdown

ADU costs can vary widely. Factors include size, type, existing plumbing, and materials used.

Financing Options

Aside from standalone loans, consider taking out a Home Equity Line of Credit (HELOC). Some homeowners may also qualify for grants like the CalHFA ADU Grant.

Impact on Property Value and Rental Income

Adding an ADU can significantly impact your property's value and potential rental income.

Increased Property Value

An ADU can boost your home's market value, making it an attractive long-term investment.

Rental Income

Renting out your ADU can provide a steady stream of income, offsetting construction costs.

Tax Implications

Be aware of potential tax implications. Consult a tax advisor to understand how an ADU might affect your property taxes.


Building an ADU in Evergreen, San Jose, can be a rewarding investment. With careful planning, understanding local regulations, and choosing the right contractor, you can create a valuable addition to your property. If you're considering building an ADU, contact us for expert guidance and support throughout the process. Your dream ADU is just a few steps away! Get a quote for your ADU project

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