More living space, more property value.
Detached ADUs, attached units, garage conversions, and junior ADUs across Los Angeles — design, permits, and construction handled end to end, on time and within budget.
The ADU process, without the permit pain.
An ADU is the highest-return square footage most LA lots can add — rental income, space for family, and property value in one build. It’s also a project that lives or dies in zoning and permitting.
Our ADU specialists start with a comprehensive site evaluation: your property’s potential, zoning requirements, budget, and timeline, all reviewed before design begins. Then we produce detailed plans and 3D renderings — free when you build with us.
We handle every document — permit applications, city submissions, engineering — and our project managers run construction from foundation to finish with strict quality control.
Typical cost & timeline by ADU type.
Real ranges from our completed projects. Your estimate is confirmed after the free site evaluation.
| ADU type | Typical cost | Timeline | Notes |
|---|---|---|---|
| Garage conversion | $50,000–$150,000 | 3–6 months | Uses existing structure |
| Attached ADU | $80,000–$200,000 | 5–10 months | Up to 50% of main home size |
| Detached ADU | $100,000–$300,000+ | 6–12 months | Up to 1,200 sq ft |
| Junior ADU (JADU) | $20,000–$50,000 | 2–4 months | Under 500 sq ft, simplified permits |
Expect $200–$400 per square foot depending on type and finishes. Garage conversions and prefab approaches can run 20–30% less than ground-up builds.
For lots that should be earning their keep.
ADUs work for rental income, multi-generational living, guest space, and home offices — and California law has never made them more buildable.
These are the units we build most.
Craft you can hold us to.
Design-build, one roof
Architects, designers, and builders on one team — from 3D renderings and permits to the final walkthrough, with no handoffs and no finger-pointing.
Free 3D design session
A free in-home design session with 3D renderings — a $3,000–$5,000 value when you build with us — so you see the space before a wall moves.
One accountable team
A 25-person team led by the same family since 1996 — with a dedicated project manager, regular updates, and a clean, organized site.
Everything, handled.
Free 3D ADU design
Detailed architectural plans and 3D renderings — a $3,000–$5,000 value, free when you build with us.
Zoning & permits
Site evaluation, zoning review, permit applications, city submissions, and engineering — all handled.
Full construction
Foundation to finishing touches with strict quality control and a dedicated project manager.
Utilities & compliance
Electrical, plumbing, HVAC, and California energy-code compliance — including solar where required.
Planning a bigger project? ADU Construction often pairs with Garage Conversions, Room Additions, or Home Builder — we can scope it all together.
Problems we solve
- Underused lots and garages storing nothing worth storing
- ADU projects stuck in permitting for a year
- Family members who need their own space, close by
- Mortgages that could use a rent check’s help
Common triggers
- Parents aging in, or adult kids boomeranging home
- Rental income that would change the monthly math
- A neighbor’s ADU that made you look at your own backyard
- New state ADU laws making the project finally feasible
What this service covers.
Every scope is different, but a adu construction project with Preferred typically includes each of these.
Standalone units up to 1,200 sq ft with private entrance, kitchen, and bath — full independence.
Connected to the main home with separate entrance and utilities — up to 50% of the home’s size.
Existing garages transformed into studios, suites, or rentals — the budget-friendly path.
Self-contained units under 500 sq ft inside the existing home — simplified permits, minimal cost.
Living space built over an existing or new garage — square footage without losing the yard.
Basements and attics repurposed into self-contained units using existing infrastructure.
Multi-level and fully custom units that maximize smaller lots.
Separate metering, legal compliance, and finishes that rent quickly and appraise properly.
Serving greater Los Angeles.
Common questions.
Ready to unlock your property’s potential?
Get a free site evaluation and 3D ADU design ($3,000–$5,000 value) — we’ll map what your lot allows and what it would earn.
(818) 312-6622