ADU Services · Southern California
Build smarter.
Live better.
An Accessory Dwelling Unit (ADU) is one of the smartest investments a Southern California homeowner can make. Generate rental income, house family, or increase your property value — Key Point Corporation guides you every step of the way.
ADU Types We Build
Every lot is different.
Every solution is too.
Whether you have a spare garage, unused backyard space, or room inside your home, Key Point Corporation has the expertise to build the right ADU for your property and goals.
Detached ADU
A fully independent backyard structure — most flexible and highest-value ADU type with its own entrance, kitchen, and bath.
Est. $200,000 – $400,000
Garage Conversion
Transform your existing garage into a livable, permitted unit. The most cost-effective ADU path with minimal site work.
Est. $90,000 – $175,000
Attached ADU
An addition connected to your home's structure — shares a wall but has a fully private entrance and all amenities.
Est. $175,000 – $300,000
Junior ADU (JADU)
A bedroom or interior space converted to a self-contained unit up to 500 sq ft — great for starter ADUs.
Est. $50,000 – $100,000
SB-9 Development
California's SB-9 law allows up to 4 units on a single-family lot. Maximize your property's density and ROI.
Est. Custom estimate
Our Process
From concept to
Certificate of Occupancy.
We manage the entire ADU journey — design, permits, construction, and final sign-off — so you don’t have to juggle multiple contractors or navigate city requirements alone.
Common Questions
ADU FAQ
Still have questions? Your first consultation is always free.
How long does it take to build an ADU?
Most ADU projects take 6–12 months from consultation to Certificate of Occupancy. Garage conversions can be faster. Permitting typically takes 1–3 months depending on the city.
Do I need to live on the property?
For Junior ADUs (JADUs), California requires owner-occupancy. Standard ADUs have no owner-occupancy requirement, giving you full flexibility.
Can I rent my ADU on Airbnb?
Long-term rentals are always permitted. Short-term rentals under 30 days are subject to local city ordinances. We can advise based on your city's specific rules.
What is the maximum ADU size?
California state law allows ADUs up to 1,200 sq ft. Junior ADUs are capped at 500 sq ft. Your lot size and local regulations may further affect the allowable size.
How do ADUs affect my property taxes?
Only the value of the new ADU is reassessed — your existing home's assessed value is not affected, making ADUs a tax-efficient investment.
Ready to add an ADU to your property?
Let’s talk. We serve Garden Grove, Fullerton, Anaheim, Santa Ana, Long Beach, and all of Southern California.