Special zoning regulations apply to ADU construction in Whittier. Our team is well versed with all these rules. Special permits are required to build ADUs in residential areas. Following the rules we will provide you with the best solutions.
The size of the ADU depends on the size of the plot. Our team will create the best design according to your plot. As per norms, the minimum size of an ADU can be 400 square feet and a maximum of 1200 square feet.
| Lot Size | Single-Family (Maximum Floor Area Allowed) | Duplex and Multi-Family (Maximum Floor Area Allowed) |
| 4,800 | 1,100 sq ft | 950 sq ft |
| 7,200 | 1,400 sq ft | 900 sq ft |
| 9,600 | 1,000 sq ft | 1,100 sq ft |
| 14,400 | 2,600 sq ft | 1,500 sq ft |
| 19,200 | 2,800 sq ft | 1,800 sq ft |
The height of the ADU in Whittier cannot be higher than the main house. Normally the maximum height of the ADU is allowed up to sixteen feet. Height of up to twenty feet may be allowed under special circumstances. We will give you detailed information about it.
The total building coverage with ADU in the plot should not exceed fifty percent. Our team will survey your plot and plan for proper coverage. Following the rules, we will prepare the ideal design.
The location of the ADU should be behind or next to the main house. The ADU cannot be built on the road side. Our team will inspect your plot and select the most suitable location. This is important.
Single-Family Properties:
Duplex and Multi-family Properties:
The exterior design of the ADU should match the main house. Special attention will be paid to color, material and architectural style. Our team will create beautiful and harmonious designs.
ADU requires an additional parking space. This rule may be relaxed in certain circumstances. Our team will provide you with detailed information.
The minimum distance from the border will have to be kept four feet. It is important to follow the rules of the buffer zone. Our team will give you detailed information about these rules.
The minimum plot size in the RF zone should be five thousand square feet. There is no exemption in this rule. Our team will assess your plot.
| 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. |
Utility connections are very important to ADUs. Our team will arrange electricity, water and sewer connections. All connections will be established according to local codes. We will ensure that all utilities are connected in a safe and efficient manner. The meter and connection point will be carefully selected.
Gas lines and internet connections will also be provided. We will obtain all the necessary permits and arrange inspections. All connections will be completed on time in coordination with utility companies. Our team will take care of all technical aspects.
It is mandatory to install smoke detectors and carbon monoxide alarms for fire safety. There should be an emergency exit. Our team will follow all safety standards. Inspection of fire marshals will be arranged.
Special permits are required to deliver short-term rentals. Different rules apply to running a business from home. Our team will give you detailed information about these rules.
All construction work will be carried out in accordance with California building codes. Safety and quality standards will be strictly adhered to. Our team will arrange regular inspections.
All necessary documents will be prepared to obtain the permit. Our team will help you with the application process. All departmental clearances will be obtained in time.
| Permit Type | Cost |
| Building Permit | $2,400 – $5,500 |
| Electrical Permit | $300 – $600 |
| Plumbing Permit | $250 – $900 |
| Mechanical Permit | $200 – $600 |
| Demolition Permit | $150 – $300 |
| Landscaping Permit | $75 – $150 |
Different requirements must be met depending on the size and condition of the property. Special attention will be paid to drainage and land condition. Our team will do a detailed inspection.
A car parking lot is mandatory for ADUs. The size of the parking should be nine feet by eighteen feet. Some areas may have additional requirements.
A distance of at least twenty feet from the side of the road must be maintained. Different rules apply for corner plots. Our team will follow the exact parameters.
A minimum distance of four feet is mandatory in the side setback. A setback of five feet will have to be kept at the back. These rules may change under special circumstances.
The area of open space should not be less than thirty percent of the total plot. The back courtyard should have enough greenery. Landscaping will be planned.
Eligible properties for ADU construction in Whittier have to meet several criteria. Factors such as plot size, zoning rules, and current use are taken into account. Our team will verify the eligibility by evaluating your property. Also, we will help you prepare all the required documents.
According to local regulations, single-family homes, duplexes, and multi-family buildings may be eligible for ADUs. Our team will conduct a detailed inspection of your property and discuss all possible options. We are committed to providing you with the best solutions.
The size of the junior ADU should be less than five hundred square feet. It is constructed inside the main house. The kitchen can be shared.
The city of Whittier has already approved some standard ADU designs. Selecting these designs speeds up the permit process. Our team will provide you with detailed information about these options.
Pre-approved designs are available in various sizes and styles. These include options ranging from one bedroom to two bedrooms. Every design conforms to local regulations and standards.
Start your ADU project with ADU Builders CA. Our expert team will work with you to make your dreams come true. Contact us today and get a free consultation.
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 Whittier 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 Whittier 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.
