Special zoning regulations apply to ADU construction in West Hills. Our team understands these rules very well. ADUs are allowed in residential areas as per local regulations. Different areas of West Hills have different zoning rules.
The size of ADU in West Hills depends on the size of your main property. A smaller size ADU can be made in smaller plots. Large ADUs are allowed to be built in large plots. Our team will help you choose the right size.
| Plot Size | Single family (maximum floor area) | Duplex and Multi-Family (Maximum floor area) |
| 5,500 | 1,350 sq ft | 1,100 sq ft |
| 8,000 | 1,650 sq ft | 1,150 sq ft |
| 11,000 | 1,950 sq ft | 1,350 sq ft |
| 16,000 | 2,950 sq ft | 1,750 sq ft |
| 21,000 | 3,150 sq ft | 2,150 sq ft |
The maximum height of ADU in West Hills should be less than the main building. The height of a one-story ADU can be up to fifteen feet. The maximum height allowed for a two-storey ADU is twenty feet. Our team produces designs following these rules.
The rule of building coverage is very important for ADU in West Hills. Up to forty percent of the total plot area can be covered. This limit is fixed by combining both the main building and the ADU. Our team ensures compliance with this rule.
There are several important things to keep in mind when choosing an ADU location. ADUs can be built behind or next to the main building. Cannot make ADU on the front. Make sure that natural light and air flow is maintained.
Single-Family Properties:
Duplex and Multi-family Properties:
The exterior appearance should match the main building. The design of windows and doors should be the same. Choose the color scheme carefully. The roof slope should be in line with the main building.
At least one parking space is required. Garage or open parking is permitted. There should be direct entry from the road. The parking lot must be paved and level.
It is mandatory to follow setback rules. Place a setback of twenty feet on the front. Leave fifteen feet blank at the back. Take care of the privacy of the neighbor.
There is a rule of minimum plot size in the RF zone. The size of ADU will be limited in small plots. There are more options available in larger plots. The rules change according to the zone.
| zone | Minimum Plot Area |
| R-20 | 5,500 sq. ft. |
| R-10 | 8,000 sq. ft. |
| R-7 | 11,000 sq. ft. |
| R-5 | 16,000 sq. ft. |
| R-2.5 | 21,000 sq. ft. |
There are special rules for the connection of electricity, water and sewer. It is necessary to take a separate connection from the main line. The meter will have to be installed separately. The water pressure and sewer slope should be correct. Permission has to be obtained from the local department. Hire licensed plumbers and electricians for connection.
Gas lines and internet connections will have to be arranged separately. Plan to install solar panels. Make provision for rainwater harvesting. Use an energy efficient system. Take advantage of the convenience of smart metering. Arrange a backup system for emergencies.
It is very important to follow the rules of fire safety. It is mandatory to install smoke detectors and fire alarms. There should be an emergency exit. Make proper arrangement of fire extinguisher. Get regular electrical equipment checked.
West Hills has special rules for short-term rentals. It is necessary to get a permit for home occupation. There are some restrictions on business activities. Additional parking arrangements will have to be made. The consent of the neighbors is required.
It is mandatory to follow building codes. Select the construction material according to the rules. Follow electrical and plumbing codes. It is important to follow safety standards. Get inspected periodically.
Keep all the documents ready for the permit. Get the plan and drawing approved. Pay the fees on time. Schedule time for inspection. Make sure to follow all requirements.
| Type of Permit | cost |
| Building Permits | $2,500 – $5,500 |
| Electrical Permit | $350 – $600 |
| Plumbing Permit | $300 – $900 |
| Mechanical Permit | $250 – $600 |
| Demolition Permit | $200 – $300 |
| Landscaping Permit | $150 – $200 |
The size of the property should be according to the rules. The slope of the ground should be less than fifteen degrees. The use of land must be residential. Take care of natural drainage. Follow the rules of cutting trees.
Enough space must be left in the front. Keep distance from the road according to the rules. Make provision for garden area. Leave the space for vehicles to come and go. Plan for landscaping.
Minimum distance must be kept on the side and back. Take care of the privacy of the neighbor. Leave the path of emergency access. Leave room for utility connections. Keep the height of the boundary wall as per the rules.
To build an ADU in West Hills, the property must meet certain criteria. The size of the ground should exceed the minimum requirement. Zoning should be in residential area as per rules. It should not be in natural disaster. There should be availability of utility connection. There must be enough parking space.
No objection certificate from the local body is necessary. The ownership of land should be clear. There should not be any dispute. All previous taxes and bills must be paid. There should be no objection from neighbours. It should be possible to follow building codes and safety regulations.
Junior ADU is a small sized unit. It is made inside the main house. The kitchen can be shared. A separate entrance is necessary. The bathroom should be private.
Some ADU designs are already approved in West Hills. Choosing these designs speeds up the permit process. Saves time and money. There are many attractive options available. Experts’ advice has been taken.
These designs include all the necessary features. Energy efficient features are provided. Maintenance is easy. The price is also reasonable. Long-lasting materials have been used.
ADU Builders CA will help you make your ADU project a success. Our expert team will guide you every step of the way. Contact us today for a free consultation. It’s time to realize the ADU of your dreams. Call and discuss your plan.
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 West 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 West 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.
