The city administration has set special zoning rules for ADU construction. It is very important to follow these rules. Our team informs you about all these rules. Special provisions have been made for construction of ADUs in residential areas. ADU can be constructed alongside the main building or separately.
| Lot Size | Single-Family (Maximum Floor Area Allowed) | Duplex and Multi-Family (Maximum Floor Area Allowed) |
| 4,800 | 1,100 sq ft | 750 sq ft |
| 7,200 | 1,400 sq ft | 950 sq ft |
| 9,600 | 1,700 sq ft | 1,150 sq ft |
| 14,400 | 2,300 sq ft | 1,550 sq ft |
| 19,200 | 2,900 sq ft | 1,950 sq ft |
The maximum height of the ADU should be less than the main building. The height of the ADU should not exceed fifteen feet. Our team helps you determine the correct height of the ADU. The height of the ADU can vary in the plains. Surrounding buildings are also taken into consideration while determining the height of the ADU.
Building coverage means how much land your ADU will occupy. No more than forty percent of the total plot area in Agoura Hills can be covered. Our team will help you calculate accurate coverage. Building coverage includes both the main building and the ADU.
The location of the ADU should be carefully chosen. ADUs can be built behind or next to the main building. Natural light and air are considered while selecting the location. The entrance to the ADU should not be visible from the road.
Single-Family Properties:
Duplex and Multi-family Properties:
The exterior design of the ADU should match the main building. The color and construction material are carefully selected. The same material is used on the exterior walls as in the main building. The roof design and slope should be adapted to the local weather.
ADU requires an additional parking space. The size of the parking space should be suitable for the standard vehicle. Access to the parking area should be easy. Parking requirement may be waived under special circumstances.
It is important to follow the minimum distance between the ADU and the property line. A distance of five feet towards the front is mandatory. Four feet must be kept on the back and side. These distances protect the privacy of your neighbors.
| Zone | Minimum Lot Area |
| R-18 | 4,800 sq. ft. |
| R-9 | 7,200 sq. ft. |
| R-6 | 9,600 sq. ft. |
| R-4 | 14,400 sq. ft. |
| R-2 | 19,200 sq. ft. |
The connection of all necessary utilities to the ADU must be separate from the main building. New connections for electricity, water and sewer are installed. Permission must be taken from utility companies for meter installation. Safety standards are followed during connection installation.
Future needs are also considered when planning a utility connection. Gas line and internet connection are planned separately. All connections are established according to local codes. Regular checks are carried out to ensure the quality and safety of the connection.
It is mandatory to follow all the standards of fire safety in ADU. Smoke detectors and carbon monoxide alarms are installed. There should be an emergency exit. Fire extinguishers are kept in a readily available place. Regular checks of safety equipment are essential.
Special permission is required to rent short-term ADUs. Domestic business will have to take permission from the city administration. The renter must follow local regulations. ADU has some restrictions on business activities.
ADU construction is required to comply with California building codes. Construction materials and techniques are selected according to the code. All electrical and piping works must conform to standards. Be prepared for regular inspections.
Keep all the necessary documents ready to get the permit. The application process can take thirty to sixty days. All fees are required to be paid on time. Be available in time for inspection.
| Permit Type | Cost |
| Building Permit | $2,500 – $5,500 |
| Electrical Permit | $300 – $550 |
| Plumbing Permit | $250 – $450 |
| Mechanical Permit | $200 – $350 |
| Demolition Permit | $150 – $250 |
| Landscaping Permit | $75 – $150 |
Your property must meet all the basic requirements for ADU construction. The slope of the ground should not exceed fifteen percent. Soil testing of the land is necessary. There should be a system of natural drainage. Conservation of all existing trees and vegetation is important.
There should be a provision of a covered parking space for ADUs. The access road to the parking lot should be clean. There should be no obstruction in the movement of vehicles. It is necessary to have enough space for emergency vehicles. The floor of the parking area should be paved.
The distance of the ADU from the road side should not be less than twenty feet. The front setback should correspond to the main building. Landscaping can be done in setbacks. Plants can be planted to maintain visual beauty. Permanent structures cannot be built in the setback area.
A distance of four feet from the side boundary and four feet from the back boundary is mandatory. Utility connections can be established in setbacks. The privacy of the neighbor is taken care of. There should be proper drainage system in the setback area.
The minimum area of the open space should be three hundred square feet. Space is left for the garden and recreation area. The back courtyard is kept green. There should be a safe place for children to play.
Single-family residential buildings are eligible for ADU construction. The size of the plot must meet the minimum requirements. The building should be in good condition and all taxes should be paid. Properties that comply with local zoning regulations qualify.
ADU can also be added to existing structures. The garage can be converted into an ADU. ADU can be built in the basement. ADU can be made by making necessary improvements in old buildings. Adherence to all safety standards is essential.
Junior ADU is smaller than five hundred square feet. It has a small kitchen and bathroom facilities. Junior ADU is built inside the main building. Electricity and water connection can be taken from the main building. Junior ADUs do not require separate parking.
The Agoura Hills Municipal Administration has pre-approved some standard ADU designs. Using these designs speeds up the permit process. The construction cost can be easily estimated. Quality standards are pre-decided.
The pre-approved design has limited scope for change. Our team helps you choose the suitable design. These designs include all the necessary features. Construction time is less and cost is also controlled.
ADU Builders CA looks forward to making your ADU project a success. Our expert team will provide you with guidance every step of the way. Adherence to all rules and standards is ensured. Contact us today and make your dream ADU come true. Quality construction is our first priority.
Fire sprinklers are only required if the primary dwelling also has them.
ADUs typically require a minimum setback of 4 feet from property lines.
Separate utility connections are optional but not mandatory for most ADUs.
The checklist includes design review, site plans, structural plans, permits, and financing.
You need site plans, floor plans, construction details, and a permit application.
Inspections typically include foundation, framing, plumbing, electrical, and final review.
Work with licensed professionals to design and construct your ADU to code.
You may need to revise and resubmit plans to the Agoura Hills planning office.
Submit complete and accurate documents and work with professionals to avoid delays.
ADUs under 750 sq. ft. are exempt from impact fees.
Yes, it includes checking structure, utilities, and obtaining conversion permits.
Yes, ADUs must meet height, size, and setback requirements, and their design should complement the primary dwelling.
Yes, but you need to ensure the ADU fits within allowable lot coverage and setback rules.
ADUs must comply with California Building Codes, including foundation, framing, insulation, plumbing, and electrical requirements.
Yes, ADUs must comply with California Energy Code (Title 24) and include energy-efficient windows, insulation, and appliances.
You must submit a revised plan to the Agoura Hills Building Department and may incur additional fees or inspections.
Yes, ADUs near high-noise areas (e.g., busy roads) must include soundproofing measures such as double-glazed windows.
Yes, you can appeal to the city’s Planning Commission or seek adjustments to meet requirements.
Lot coverage varies by zoning but generally allows for up to 50% of the lot to be developed, including the primary dwelling and ADU.
