ADU SERVICES
ACROSS LA COUNTY
Skyline Builders CA Inc. specializes in every type of Accessory Dwelling Unit permitted in Los Angeles County. From a $65,000 Junior ADU to a $550,000 two-story detached unit, we deliver design-forward, fully permitted ADUs on time and on budget.
DETACHED ADU
A detached ADU is a fully standalone structure built on your existing residential lot — completely separate from your main home. It has its own foundation, utilities, entrance, kitchen, and bathroom. This is the most versatile ADU type and consistently delivers the highest rental income and property value appreciation in Los Angeles County.
- Maximum privacy — no shared walls with main home
- Highest rental income potential ($2,000–$4,500/mo in LA)
- Can be 1 bed/1 bath up to 3 bed/2 bath
- Eligible for CalHFA $40,000 pre-development grant
- Adds 12–15× annual rent to property value
- Permitted as a permanent dwelling — can be sold separately under SB9
ATTACHED ADU
An attached ADU is an addition built onto your existing home — sharing at least one wall — but with its own separate entrance, kitchen, and bathroom. It's the ideal solution for homeowners with smaller lots who want to maximize their property's income potential without sacrificing yard space. Attached ADUs are also typically faster to permit because they tie into existing utility connections.
- Shares one or more walls with the main home
- Ideal for lots too small for a detached unit
- Faster utility connections — ties into existing systems
- Can house in-laws, adult children, or rental tenants
- Lower cost per square foot than detached builds
- Eligible for all LA County ADU incentive programs
GARAGE CONVERSION ADU
A garage conversion ADU transforms your underused garage into a fully permitted, livable dwelling unit. Because the structure already exists, garage conversions are the fastest and most affordable path to rental income in Los Angeles. California law (AB 2221) prohibits cities from requiring replacement parking when you convert a garage to an ADU, making this one of the most streamlined ADU types to permit.
- Fastest path to rental income — 3–6 months
- Most affordable ADU type — starting at $95,000
- No replacement parking required under AB 2221
- Existing structure reduces foundation and framing costs
- Can add a loft for additional sleeping space
- Ideal for 1-car and 2-car garages (200–600 sq ft)
JUNIOR ADU (JADU)
A Junior ADU (JADU) is created by converting existing interior space within your home — such as a bedroom, basement, bonus room, or attached garage — into a self-contained dwelling unit of up to 500 square feet. JADUs are the most affordable ADU option because they require no new construction footprint. California law requires only an efficiency kitchen (not a full kitchen) and a separate entrance, making them faster and cheaper to permit.
- Lowest cost ADU option — starting at $65,000
- No new construction footprint required
- Only requires an efficiency kitchen (not full kitchen)
- Fastest permit timeline — 2–4 months total
- Owner must reside on the property (main home or JADU)
- Maximum 500 sq ft — ideal for single-person occupancy
TWO-STORY ADU
A two-story detached ADU maximizes livable square footage on a compact lot by building vertically. California law allows ADUs up to 1,200 sq ft and up to two stories in most jurisdictions. Two-story ADUs are ideal for homeowners who want to maximize rental income or provide full family housing without consuming their entire backyard footprint. They command the highest rents of any ADU type in LA County.
- Maximum 1,200 sq ft — highest rental income potential
- Builds vertically to preserve yard space
- Can accommodate 2–3 bedrooms and 2 bathrooms
- Ideal for long-term family tenants or high-income renters
- Eligible for CalHFA $40,000 pre-development grant
- Highest property value appreciation of all ADU types
COMPARE ALL ADU TYPES
Use this table to quickly identify which ADU type best fits your property, budget, and goals.
| FEATURE | DETACHED | ATTACHED | GARAGE CONV. | JUNIOR (JADU) | TWO-STORY |
|---|---|---|---|---|---|
| Starting Price | $175,000 | $140,000 | $95,000 | $65,000 | $280,000 |
| Max Size | 1,200 sq ft | 1,000 sq ft | 600 sq ft | 500 sq ft | 1,200 sq ft |
| Build Timeline | 6–10 months | 5–9 months | 3–6 months | 2–4 months | 8–14 months |
| Rental Income | $1,800–$4,500/mo | $1,600–$3,800/mo | $1,400–$3,000/mo | $1,100–$2,400/mo | $3,000–$5,500/mo |
| New Foundation | Existing slab | — | |||
| Separate Entrance | |||||
| Full Kitchen | Efficiency only | ||||
| Owner Occupancy Required | — | — | — | — | |
| CalHFA Grant Eligible | |||||
| Best ROI | ★★★★☆ | ★★★★☆ | ★★★★★ | ★★★★★ | ★★★★☆ |
ADD-ONS & UPGRADES
Enhance your ADU with these popular upgrades. All add-ons are fully permitted and integrated into your project.
Solar & Battery Storage
Add rooftop solar and a battery backup system to your ADU for energy independence and lower utility bills.
Covered Patio / Deck
Extend your ADU's livable space with a permitted covered patio or deck — adds significant rental appeal.
Smart Home Package
Keyless entry, smart thermostat, video doorbell, and leak detection — standard in premium LA rentals.
Landscaping & Hardscape
Complete the project with drought-tolerant landscaping, concrete pathways, and privacy fencing.
Loft Addition
Add a sleeping loft to a studio ADU for additional space without increasing the footprint.
Accessibility Upgrades
ADA-compliant features including wider doorways, roll-in shower, and grab bars for aging-in-place.
GET UP TO $40,000 IN FREE GRANT MONEY
The CalHFA ADU Grant Program provides qualifying homeowners with up to $40,000 in pre-development cost assistance — covering design, permits, and engineering fees. Skyline Builders will guide you through the entire application process at no extra charge.