An ADU (accessory dwelling unit) can be a great way to add living space to an existing property in Los Angeles without altering your home or building a traditional addition. An ADU is a smaller, independent dwelling located on the same property as a primary residence that has its own entrance, kitchen, and bathroom(s). An ADU can offer the benefit of increasing your property value, providing rental income, or simply providing a separate space that accommodates the needs of an aging parent or adult child.
Estimate ADU Costs
Like any type of home, an ADU’s cost can vary based on its size and features. However, the biggest factor behind ADU cost is the type of structure selected. Here’s a look at some general cost estimates for various types of ADUs.
Detached ADU
Sometimes referred to as a backyard cottage, a detached ADU is a standalone structure with a separate entrance from the main home. Detached ADUs also have their own utilities and landscaping. On average, the cost to build a detached ADU in Los Angeles ranges from $200,000 to $400,000.
Attached ADU
An attached ADU maintains a structural connection with the property’s main residence. However, it’s built with its own main entrance that allows residents and visitors to enter and exit without going through the main home. Like a detached ADU, an attached ADU also has its own kitchen and bathroom(s). Attached ADUs are generally built on the back or side portion of a main home. An attached ADU in Los Angeles can generally cost between $150,000 and $325,000.
Garage Conversion ADU
Unlike ADUs that are completely new constructions, garage conversion ADUs are created using an existing garage. With this concept, the homeowner transforms an attached or detached garage into a living space that is its own separate housing unit with an entrance, kitchen, and bathroom(s). The obvious benefit of a garage ADU is that initial construction costs are much lower. In addition, permitting rules are often more relaxed for converting an existing structure compared to building a new structure from scratch. The cost for a garage conversion ADU in Los Angeles often ranges from $60,000 to $190,000.
Junior Accessory Dwelling Unit (JADU)
A JADU is a type of ADU that’s created within an existing space of a single-family home. Often used as “micro” apartments or condos, JADUs do not exceed 500 square feet. They can be made by converting a bedroom or other room in a home into an independent unit with its own small kitchen and bathroom. The cost to convert a portion of a home into a JADU generally ranges from $50,000 to $100,000.
Factors Affecting ADU Cost
Homeowners building ADUs have the option to create larger, high-end ADUs full of modern and high-end features or focus on making a more utilitarian and budget-friendly space that still satisfies all zoning and living requirements. With that in mind, it’s important to say that anyone considering building an ADU in Los Angeles should work closely with an architectural firm specializing in ADU builds.
Rules and regulations regarding ADUs in California are notoriously strict. While most neighborhoods are welcoming to ADUs because they provide an affordable, low-impact way to help address the housing shortage, homeowners must go before zoning boards with their plans. If plans for a new ADU do not comply with regulations, applications will be denied. Here’s a look at the cost considerations to keep in mind when planning to build an ADU.
Size and Design Of ADU
An ADU’s square footage is generally the biggest determinant of ADU cost. Layout and design also impact cost. For example, choosing a design with vaulted ceilings, many windows, more than one bathroom, a front porch, walk-in closets, and several entry points will increase the cost of an ADU of any size.
Materials Used
Roofing materials, siding type, and interior finishes all contribute to the total ADU cost. For example, a premium home with slate roofing and stone siding will be more expensive than a home of the same size with asphalt roof shingles and vinyl siding. Interior finishes like granite counters, a stone fireplace, and wood flooring also contribute to the price.
Engineering and Location
Depending on the terrain of the existing property, homeowners may need to do intensive excavation to create a smooth, flat space for an ADU’s foundation. A hilly, sloped yard may need to be leveled before an ADU can be placed. If an ADU is set back a far distance from the road, the cost to add a new driveway that cuts through the main property will also add to the ADU cost.
