ADU Construction Cost in Long Beach, CA (2026)
A adu construction in Long Beach costs $285–$475 per sq ft, with a typical mid-size ADU running $86k–$171k. Small projects start around $57k; large or high-end work can reach $428k or more.
Costs in Long Beach run about 5% below the LA County baseline thanks to older housing stock and coastal exposure on materials.
ADU Construction Cost by Size in Long Beach
Totals adjusted for the Long Beach market (0.95× LA County baseline). Ranges include labor, materials, permits, and contractor overhead.
| Size | Type | Range | Low | High |
|---|---|---|---|---|
| Small | JADU / studio | 150–400 sq ft | $57k | $124k |
| Medium | 1-bed garage conversion | 400–600 sq ft | $86k | $171k |
| Large | Detached 2-bed | 800–1,200 sq ft | $238k | $428k |
What Affects ADU Construction Cost in Long Beach?
- ADU type (JADU vs attached vs detached).
- Site prep and grading.
- Utility connections.
- CA Title 24 energy compliance.
- City ADU permit timeline.
- Long Beach market premium: local pricing reflects older housing stock and coastal exposure on materials, which shifts totals about 5% below the LA County baseline.
Get exact adu construction bids in Long Beach
We'll match you with up to 3 licensed Long Beach contractors.
Get MatchedADU Construction Sub-Type Comparisons
Garage Conversion ADU vs Detached ADU
Garage conversions reuse the existing slab and shell at $90k–$180k; a detached new-build ADU runs $250k–$450k but unlocks larger floor plans and higher rent.
Junior ADU (JADU) vs Attached ADU
A JADU (≤500 sq ft, within the home) runs $60k–$130k and shares utilities; an attached ADU is a true second unit at $150k–$350k with its own entrance and meter.
How to Get the Best Price on a ADU Construction in Long Beach
- Get 3 line-itemized bids on the same scope through Keystone Connect — Long Beach adu construction pricing varies 10–25% between contractors.
- Lock major materials and finishes before signing; mid-project change orders are the #1 cost driver on adu construction jobs.
- Bid in shoulder seasons (Jan–Mar or Sep–Oct) when Long Beach contractor schedules are open and rush premiums disappear.
- Verify CSLB license, insurance, and bond before paying any deposit. California caps deposits at $1,000 or 10% of contract, whichever is less.
Frequently Asked Questions — ADU Construction in Long Beach
Need more answers? Visit our contractor FAQ hub.
Get Matched with Licensed Long Beach Contractors
Tell us about your adu construction and we'll match you with up to 3 vetted contractors.