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Book a callAccessory Dwelling Units (ADUs) have seen a surge in popularity as a solution to housing shortages, offering a versatile and efficient way to increase living space. Known by many names—granny flats, in-law units, backyard cottages—ADUs provide a unique blend of affordability and innovation. If you're a builder, homeowner, or real estate enthusiast in Redlands, California, you may be wondering about the feasibility and process of constructing an ADU. This guide will walk you through everything you need to know.
An ADU is a secondary housing unit located on the same lot as a primary single-family dwelling. These units are fully equipped with facilities for living, sleeping, eating, cooking, and sanitation.
A standalone structure separate from the main house, offering complete privacy and independence.
Physically connected to the main house, sharing at least one wall, making it easier to access the main home if needed.
Created by repurposing existing spaces like garages, basements or attics into livable areas.
A smaller unit (up to 500 square feet) within the walls of an existing single-family residence, perfect for housing a student or solo person.
• General Lot: Minimum height of 16 feet allowed.
• Near Transit Stops: Minimum height of 18 feet allowed, with an additional 2 feet (up to 20 feet total) permitted for roof pitch alignment if needed.
• Multifamily Dwellings: Minimum height of 18 feet.
• Maximum height of 25 feet or the height limit of the primary dwelling, whichever is lower.
• One ADU (attached or detached) and one JADU allowed.
• Up to two detached ADUs permitted.
• At least one ADU within the existing multifamily dwelling allowed, up to 25% of the existing units.
• Conversion of non-livable spaces like garages into ADUs allowed.
Detached ADU: Up to 1,200 square feet maximum.
Attached ADU: Up to 50% of the floor area of the primary dwelling, with a minimum of 800 square feet. Junior ADU: Maximum of 500 square feet.
Redlands ADU Regulations Allowed Locations ADUs are generally permissible on properties where residential uses are allowed in Redlands. This includes lots with an existing or proposed single-family home or multifamily building. Specific location eligibility is determined by zoning district and regulations.
There are no minimum lot size restrictions for building an ADU in Redlands. However, the lot must meet all other zoning requirements for setbacks, coverage, height and other development standards based on its residential zoning category.
All ADUs in Redlands must comply with California state building codes as well as local city regulations. This includes:
ADUs must meet all applicable construction standards, including structural, electrical, plumbing, mechanical systems, fire safety, energy efficiency and green building measures.
ADUs are not required to have a fire sprinkler system installed unless it is already mandated for the primary dwelling unit based on its size, construction type or occupancy.
No additional parking spaces are required for ADUs constructed in Redlands, except in certain instances where on-street parking is prohibited or significantly limited on the property's street frontage.
All new ADUs must have separate direct utility connections and metering for electricity, gas, water and sewer services branched off the main home's utility lines. This is required to create an independent living unit.
The city of Redlands does not currently have an owner-occupancy requirement specifically for ADUs. However, if the property owner plans to rent out both the primary dwelling unit and the ADU as non-owner occupied units, they must obtain a business license and follow rental housing laws from the city.
Must have a minimum setback of at least 4 feet from the side and rear property lines, or greater if required by zoning.
Existing setbacks for the portion of primary structure being converted must maintain sufficient setbacks for fire safety and emergency access.
Generally, do not require any additional off-street parking spaces.
Attached and Detached ADUs: One off-street parking space is required unless any of the following exemptions apply:
• The ADU is located within one-half mile walking distance of public transit.
• The ADU is contained within the existing walls of the primary residence.
• The ADU is located in an area with permitted on-street parking and no parking requirements.
ADU Construction Options Basement Conversion Transforming an existing basement into an ADU offers a self-contained living area ideal for renting out or housing family members while maintaining privacy. This type of conversion enhances functionality and can increase property value without altering the home's external structure.
Garage Conversion Repurposing an existing garage into an ADU provides a convenient living unit while preserving the front exterior of the home. This practical approach leverages underutilized garage space and can significantly boost property value and rental income potential.
SB9 Lot Split California's Senate Bill 9 (SB9) allows qualifying homeowners to split their single-family residential lot into two new parcels. This enables the construction of up to four residential units total - such as the main home, ADU, junior ADU and another full unit. Adhering to local zoning regulations, SB9 maximizes land use and increases housing availability.
ADU Pre-Fabrication Prefabricated ADU units built off-site in a factory can dramatically reduce construction timelines once delivered. These pre-built modular units still require a foundation and utility hookups but save on labor.
Custom New Construction Working with an architect, homeowners can design and build a fully customized new detached ADU structure suited to their needs and taste. This maximizes flexibility but costs more than prefab or conversion options. Consult Our Experts
The overall timeline can vary significantly based on factors like the ADU design complexity, construction method (on-site build vs prefab delivery), city permit review timelines, and the availability of your selected architect, designers or builders. In general, the process from initial planning to completion may take anywhere from 6 months to over a year.
Total costs depend on a wide range of variables including the ADU's size, design features, construction method (modular prefab vs custom stick-built), as well as material and labor expenses at the time of building. Typically, cost estimates for an ADU range anywhere from $150 to over $400 per square foot in California. For a detailed estimate specific to a planned ADU, homeowners should use an online cost estimator tool or consult directly with local ADU builders and contractors providing recent pricing data.
Yes, property owners in Redlands can legally rent out an ADU on their lot, provided they follow all relevant regulations and obtain the necessary permits and business licenses. Under current city rules, the ADU owner must reside on the property in either the primary dwelling unit or one of the ADUs. Short-term vacation rentals under 30 days may have further restrictions.
Yes, all newly constructed ADUs require an approved building permit from the Redlands Building and Safety Division before construction can begin. Depending on the project scope, additional permits for electrical, plumbing, mechanical and other trades may also be necessary which are reviewed concurrently. The permit process ensures the ADU plans comply with building codes, zoning laws and development standards.
Generally, the property owner must reside on the property only if a JADU is constructed.
An ADU will likely increase your property's value, roughly estimated at 100 times the ADU's monthly rental value. For example, an ADU that rents for $1,500/month could increase property value by approximately $150,000.
Property taxes will slightly increase based on the added value of the ADU. The base value of your property will not be reassessed. For instance, if an ADU adds $100,000 in value, and your tax rate is 1.1%, your property tax would increase by $1,100 annually.
Building an ADU in Redlands offers a promising opportunity to increase living space, generate rental income, and boost property value. With favorable regulations and multiple construction options, the process is more accessible than ever. Whether you're a local builder, homeowner, or real estate enthusiast, understanding the intricacies of ADU development can help you make informed decisions and capitalize on this innovative housing solution.
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