Cupertino ADU Requirements – All You Need to Know

Accessory Dwelling Units (ADUs) are secondary dwelling units located on the same lot as a primary residence. ADUs are becoming increasingly popular in California, including in Cupertino.

Are you considering adding an accessory dwelling unit (ADU) to your property? Fields Remodeling can help you get the job done promptly and professionally. Our team has years of experience in the ADU industry, and we know how to ensure your property looks its best.

Since 1990, when the California Residential Land Use Law was introduced, homeowners have had the opportunity to add an ADU to their property. ADUs are primarily used as second homes or for retirement purposes, but you can also utilize them as primary residences.

Fields Remodeling is the perfect contractor to help you get started for your Cupertino ADU requirements if you’re considering adding an ADU to your property. We have years of experience in the ADU industry and know how to ensure your property looks its best. Contact us today to learn more about our services.

Cupertino has specific requirements for ADUs that homeowners must meet to build them.  This article will provide an overview of the requirements for building an ADU in Cupertino for homeowners considering this option.

1. Zoning Requirements

Cupertino has specific zoning requirements for ADUs. Zoning codes vary by location in Cupertino, but generally, ADUs must meet the following criteria:

  • The property must get zoned for single-family use.
  • The ADU must be located on the same lot as the primary residence.
  • The ADU must be a maximum of 1,200 square feet or no more than 50% of the area of the primary residence, whichever is less.
  • The ADU cannot be in the front yard setback.

2. Building Regulations

Cupertino has specific building regulations when it comes to constructing or converting a space into an ADU:

  • The ADU must comply with all state and local building codes, including fire regulations and health and safety codes.
  • The ADU must have an independent entrance.
  • The ADU must have a kitchen and bathroom.
  • The ADU must have a separate utility meter.
  • The ADU must not exceed the height of the primary residence and is limited to one story.

3. Permitting Process

Homeowners must obtain permits from the City of Cupertino before constructing or converting a space into an ADU. The city has streamlined the permitting process to encourage the construction of ADUs.

Homeowners must first submit plans for review by the city. Once the plans are approved, homeowners must obtain a building permit. The city also requires homeowners to notify their neighbors of their plans to build an ADU and provide contact information for the town in case of any concerns or issues.

4. Parking Requirements

Cupertino requires that homeowners provide one parking spot for each bedroom in the ADU. However, the city has relaxed these requirements when there is a lack of adequate parking or evidence that the homeowner or tenant does not own a vehicle.

Financing Options

Furthermore, homeowners should consider other factors like financing options – either through personal loans or home equity lines of credit – while planning their projects since constructing another structure on one’s property can involve high costs.

Tax Liability

It is also critical for homeowners considering adding ADU(s) to understand how these structures can impact taxes levied on their properties so they may consult tax professionals accordingly during the planning stages.

 5. Renting an ADU

Homeowners in Cupertino are allowed to rent out their ADUs, provided they comply with the following requirements:

  • The ADU cannot be sold separately from the primary residence.
  • The ADU must be rented for at least 30 consecutive days.
  • The homeowner must provide proof of rental insurance to the city.

Building an ADU in Cupertino can be an intelligent investment for homeowners. It can provide additional income, housing for family members or friends, or serve as a home office or studio. However, it is crucial to comply with the city’s requirements and obtain necessary permits before starting construction or converting a space into an ADU.


Overall, it’s important to note that creating/accessing more living space through building/renovating/adapting existing structures into secondary residential areas like “granny flats” can come at high costs but could also offer benefits such as rental income generation opportunities. Homeowners in Cupertino should carefully assess the implications of ADUs on their property before embarking on such a project to avoid costly surprises and ensure compliance with local laws. You are always welcome to visit us for valuable suggestions and free estimates!

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