Backyard & ADU Homes

A backyard home or accessory dwelling unit (ADU) is a smaller secondary home placed on the same property as a primary residence. These homes are commonly used as guest houses, rental units, in-law suites, or backyard offices. Many ADUs are factory-built homes such as tiny homes, modular homes, or prefab cottages that are delivered to your property and installed on a foundation or utility connections. ModelTown helps you compare ADU-friendly homes from multiple manufacturers so you can find options that work with your land, budget, and local zoning rules.

It depends on local zoning and building regulations, which vary by city and county. Some areas actively encourage ADUs, while others require specific permits, size limits, or foundation requirements. Common factors that affect approval include maximum square footage, setbacks from property lines, utility hookups, and whether the home is placed on a permanent foundation or on wheels. ModelTown highlights homes commonly used for backyard ADU placements, but buyers should always verify local zoning requirements before purchasing.

The cost of a backyard ADU depends on size, construction method, and finishes. Small studio ADUs often start around $50,000 to $120,000, while one-bedroom backyard homes typically range from $90,000 to $200,000 or more. Larger modular ADUs can exceed $300,000. These base prices usually represent the home itself and may not include delivery, installation, site preparation, foundation work, or utility connections. ModelTown shows base price ranges when available so buyers can compare homes before requesting quotes from manufacturers.

Most cities limit the maximum size of backyard ADUs based on local zoning rules. Many jurisdictions allow ADUs between 400 and 800 square feet, while some cities permit up to 1,200 square feet. Size limits may also depend on the size of the primary home, lot coverage rules, and setback requirements from property lines. ModelTown allows buyers to filter homes by square footage, beds, baths, and layout to help identify ADU-compatible models that may fit within local regulations.

Sometimes. A tiny home can be used as a backyard ADU if it meets local zoning and building code requirements. Key factors include whether the home is built on wheels or a permanent foundation, whether it meets residential building codes or RV standards, and whether the home can connect to utilities such as water, sewer, and electricity. Many homeowners choose modular or prefab ADUs designed specifically to meet residential codes. ModelTown allows buyers to compare tiny homes, modular ADUs, and other small homes that may work as backyard dwellings.

Many cities require backyard ADUs to be placed on a permanent foundation and connected to utilities, especially if the unit will be used as a rental or long-term residence. However, some jurisdictions allow tiny homes on wheels or park models to be placed in backyards under RV or temporary structure rules. Before purchasing a home, homeowners should check local zoning requirements, foundation rules, and utility connection standards. ModelTown helps buyers compare homes that are commonly used for backyard ADU placements.

Several types of homes may qualify as backyard ADUs depending on local regulations. These include tiny homes on wheels, modular homes built in factories, panelized or kit homes assembled on site, prefab cabins or cottages, and container homes. Some municipalities require homes to meet residential building codes or modular certifications, while others allow RVIA-certified park models. ModelTown allows buyers to compare these different home types and filter options by size, price, and build method.