Whether you are considering building an accessory dwelling unit from on-site, installing modular/prefab units that have been built off-site, or converting a space into a living space, having the proper Cupertino ADU permit is essential.
As professional remodeling contractors in Cupertino, we always obtain the proper permits for every project and help you understand the varied codes and permitting requirements.
The city of Cupertino ADU guidelines and requirements are intended to provide an efficient process for approving ADUs while protecting the neighborhood’s character. The requirements include limits on the size and height of the ADU, requirements for parking, and owner occupancy.
Lot size requirements for accessory dwelling units (ADUs) are flexible, with no specific minimum or maximum size criteria. However, there are other rules to consider:
The allowable size of an ADU in Cupertino depends on its connection to the main house. Attached ADUs have size limitations, while detached ADUs offer more flexibility.
ADUs cannot exceed 50% of the size of the existing residence, with a maximum limit of 1,200 square feet. For example, if the main home is 2,500 square feet, the attached ADU should not exceed 1,200 square feet.
Cupertino ADU permits allow a maximum height of 16 feet and a limit of two stories. These restrictions ensure that ADUs blend harmoniously with the surrounding neighborhood.
For detached ADUs, one parking space per bedroom or unit is required. Off-street parking can be arranged in tandem or within the property’s setbacks as long as it remains safe to access. If the construction involves converting a garage, replacement off-street parking must be provided.
Fire sprinklers are generally not mandatory in ADUs unless required in the main residence.
Setbacks determine a structure’s minimum distance from streets, buildings, or other features. Here are the setback regulations for ADU construction in Cupertino.
ADUs must maintain rear and side setbacks of at least 4 feet. Front setbacks follow the underlying zoning of the property. These standards also apply to detached ADUs on multi-family properties.
By California Senate Bill 1069, aimed at increasing housing supply, ADUs in Cupertino can be used for long-term rentals. Short-term rentals (less than 30 days) are not permitted.
The specific permits required for Cupertino ADU construction can vary depending on the location and local building codes. However, here are some common permits that you may need during the ADU construction process:
| Permit | Coverage |
| Building Permit | Covers the overall construction process, including design, foundation, framing, roofing, and finishing. |
| Zoning Permit | Ensures compliance with local zoning regulations and land use requirements. |
| Design Review Approval | Required in some jurisdictions to ensure the ADU’s design aligns with the neighborhood aesthetics. |
| Grading Permit | Needed for extensive site preparation involving excavation or grading. |
| Plumbing Permit | Required for plumbing work, including fixtures, water supply lines, and drainage systems. |
| Electrical Permit | Necessary for electrical work, such as wiring, outlets, switches, and electrical panel installation. |
| Mechanical Permit | Needed for HVAC systems like heating or air conditioning. |
| Utility Connection Permits | Permits for connecting the ADU to water, gas, sewer and electricity utility systems. |
Determining the cost of permits for your ADU construction project in Cupertino is an important step. The permit costs can vary based on several factors, including:
The total ADU permit cost in Cupertino includes various elements such as ADU type, architectural and structural plan designs, building permit fees, zoning permit fees, impact fees, and other miscellaneous fees and development taxes.
Here is a breakdown of some common permit costs in Cupertino:
Get your ADU project in Cupertino to a successful start with Done Right Home Remodeling. We specialize in helping you navigate the permit process for hassle-free ADU construction. Contact us today
In Cupertino, to demonstrate the structural soundness of your ADU during the permit process, you will need detailed architectural and engineering plans, including structural calculations and drawings. These documents should showcase the design, foundation, framing, and other elements that ensure the ADU meets the required safety standards.
Detached ADUs in Cupertino generally require the same permits as attached ADUs, including building permits, zoning permits, and potentially additional permits based on specific design or location requirements.
Cupertino has specific elevation requirements for ADUs in flood-prone areas based on local floodplain management regulations that aim to mitigate flood risks.
The appeals process typically involves submitting a written appeal with supporting documentation explaining the grounds for the appeal.
