An ADU (Accessory Dwelling Unit) is a smaller, independent living space built on the same property as a main home. It has its own entrance, kitchen, bathroom, and sleeping area, making it a fully separate residence, not just an extra room.
In Butte County, ADUs have become a popular way for homeowners to add rental income, house family members, or increase property value, all while staying on their existing lot.
If you’ve ever wondered what an ADU is—or how one might fit on your property—you’re not alone. Accessory Dwelling Units (ADUs) are becoming a popular way for homeowners in Butte County to create flexible living spaces, add property value, and bring family closer together.
An Accessory Dwelling Unit (ADU) is a smaller, independent living space built on the same lot as a primary home. Think of it as a guest house, in-law suite, rental, or even a home office. An ADU has its own entrance, kitchen, bathroom, and sleeping area, making it a fully functional residence.
In California, ADUs are supported by state law to help provide more housing options while keeping families and communities connected. Across Butte County, more homeowners are exploring ADUs as part of long-term property planning and multi-generational living.
| Type | Description | Common Use |
| Detached ADU | Separate from the main house | Guest home, rental unit, office |
| Attached ADU | Connected addition with shared wall | Extended family or private suite |
| Conversion | Converts existing garage or shed into living space | Rental or studio |
| Interior Conversion (Junior ADU) | Uses space inside main home | Office, studio, or caregiver suite |
Trilogy Tip: Before we start building, we’ll help navigate local zoning and permit requirements.
Beyond added space, ADUs bring a world of benefits:
When you work with Trilogy, you’ll also get the clarity and accountability of our True Quote Process—so your ADU project stays on time, on budget, and stress-free.
Building an ADU isn’t a one-size-fits-all project. You’ll want to think about:
If you’re thinking about building an ADU in Butte County, there’s good news: local ordinances now make it easier than ever to add more living space to your property. Homeowners can build up to three total units on a single lot, with rear yard setbacks as small as four feet.
For residents of Paradise, the Town even provides free ADU building plans and an Informational Guidebook to help you get started.
| ADU Type | Maximum Size | Additional Details |
| Detached ADU | • 850 sq ft max for 1 bedroom • 1,000 sq ft max for 2 bedrooms | • Setbacks ≥ 4 ft from rear and side yards • Subject to septic capacity and local zoning limits |
| Attached ADU | • Up to 50% of the main home’s net floor area • 850 sq ft max for 1 bedroom • 1,000 sq ft max for 2 bedrooms | • Must be directly connected to the primary residence • Subject to ADU zoning and septic requirements |
Trilogy Tip: Before designing your ADU, confirm current regulations with the Town of Paradise Planning Department or Butte County Building Division. Our Trilogy team can help review your lot size, septic capacity, and local zoning to ensure your project meets all requirements, saving time and stress along the way.
What is an ADU?
An ADU (Accessory Dwelling Unit) is a small, independent living space, like a guest house, in-law suite, or rental unit, built on the same lot as a main home. It has its own entrance, kitchen, and bathroom.
What does ADU stand for?
ADU stands for Accessory Dwelling Unit.
What is the difference between an ADU and a JADU?
An ADU is a fully independent unit with its own kitchen and bathroom. A JADU (Junior ADU) is smaller, built within the existing footprint of the main home, and may share a bathroom with the primary residence.
Are ADUs allowed in Butte County?
Yes. Most areas within Butte County, including Paradise, allow ADUs under California's state housing laws. Always check your specific property's zoning before starting design.
How big can an ADU be in Butte County?
Detached ADUs can be up to 850 square feet for one bedroom or 1,000 square feet for two bedrooms. Attached ADUs follow the same size limits, or up to 50% of the main home's floor area, whichever is smaller.
How long does it take to build an ADU?
Timeline depends on permits, materials, and whether it's attached or detached. Trilogy's True Quote Process helps set realistic expectations from the start.
Can I rent out my ADU?
In many cases, yes. Local laws allow long-term rentals, not short-term vacation stays. We'll help you verify what applies to your property.
What changed and why:
Whether you’re planning for family, flexibility, or future investment, building an ADU is a smart way to make your property work harder for you—and still feel like home. Send us a message to get started!
