Prefab ADU Southern California
Looking to add more space to your property without the long wait of traditional construction? Consider prefabricated accessory dwelling units.
Get in touch
They are designed off-site, then delivered and assembled on your lot. A prefab ADU in Southern California is faster to build, easier to permit, and often more cost-effective than building from scratch.
Benefits
Top Advantages of Prefab ADUs in SoCal
Speedy installation
Most prefab units can be installed in a matter of weeks once permits are approved.
Budget-friendly
Factory-controlled conditions reduce waste and labor costs, ensuring efficient production.
Energy-efficient
Many modular ADUs offer green certifications, smart insulation, and solar-ready options for efficiency.
Permit-friendly.
Many cities in Southern California encourage ADU development, with prefab providers helping with permits.
recommendations
How a Prefab ADU Adds Value and Flexibility
Design Consistency and Quality Control
Built in a controlled factory setting, prefab ADUs maintain high construction standards, reducing on-site surprises
Scalable for Different Needs
Panelized ADUs come in different sizes and layouts to fit your needs, whether for family, work, or renters.
Less Mess
Since most work is done off-site, there’s less noise and disruption at your home.
prices
How Much Does a Prefab House Cost
ADU Type
Studio
One-bedroom
Two-bedroom
Area
250–400 sq ft
400–600 sq ft
600–1,000 sq ft
Price
$100,000–$140,000
$130,000–$180,000
$170,000–$250,000+
Cost Estimate
It depends on size, features, and location. But in general, prefab ADUs are more affordable than traditional builds. Visit the calculator page for a detailed estimate.
Get My Cost Estimateexamples
Real-Life Backyard ADU Transformations
Silverstone Annex
Silverstone Annex
A bright and airy 400 sq ft unit for an aging parent, complete with wide doorways and no steps
Silverstone Annex 2
Silverstone Annex 2
A bright and airy 400 sq ft unit for an aging parent, complete with wide doorways and no steps
FAQ
Common Questions About Prefab ADU
Can I put a prefab ADU on any residential lot?
In most cases, yes. California law makes it easier than ever to build prefab ADUs, but site conditions and local rules still apply. A feasibility check is the best first step
Does a prefab ADU come with a bathroom and kitchen?
Yes! Most prefab units have everything you need - like a bathroom, a little kitchen, and even laundry in some cases
How quickly can a prefab ADU be ready?
Sometimes prefab ADUs in Southern California can be installed in as little as one month after the site is ready. Keep in mind that you will still need time to obtain permits and prepare the lot
Curious About Your ADU Possibilities?
Interested in seeing if a prefab ADU will work on your lot? We’ll help you understand your options, your local codes, and what the total cost might look like.
More information
Prefab ADUs are a great way to add flexible, useful space like a backyard rental, guest room, or a place for family. They can include a bathroom, kitchenette, storage, and even a loft, giving you everything you need in a small home.
See more