California-licensed ADU specialist contractor based in Fullerton. CSLB #1020301, class B. Identified in our directory because the business name explicitly contains an ADU keyword.
The data below is a snapshot of the CSLB Public Data Portal as of April 28, 2026. Status can change at any time (suspension, expiration, revocation, change in classifications, bond amount changes). Always click through to the CSLB Instant License Check above before signing any contract — that's the authoritative source, not us.
| License number | #1020301 |
|---|---|
| Business name | Apex Adu |
| Primary status | CLEAR |
| Classification(s) | B |
| Business structure | Corporation |
| Issued | 2016-11-03 |
| Expires | 2027-02-28 |
| Mailing address | 3501 EGERER PL, Fullerton 92836 |
| Phone | (562) 888 1201 |
| Contractor's bond | $25000 |
| Workers' comp coverage | Exempt |
Apex Adu has held a CSLB class-B licence for 9 years (since 2016). Mid-tenure — established but not pre-state-preemption-era.
Business structure: Corporation. Corporate-form contractors carry separate liability protection from the owner's personal assets. Verify the corporation is in good standing with the California Secretary of State's business search before signing.
Contractor's bond posted: $25,000 — the California statutory minimum for class-B contractors. Standard for the industry.
Workers' compensation coverage: Exempt. This typically means the firm has no W-2 employees and operates with the owner-operator alone (or with subcontractors who carry their own coverage). California requires W-2 employees to be covered. If this builder grows mid-project and hires staff, they must obtain coverage before those employees begin work.
A California class-B (General Building) contractor licence authorises the holder to take on building projects requiring at least two unrelated trades — framing + electrical, or concrete + plumbing + framing, etc. Almost all ADU work qualifies because an ADU is by definition a complete dwelling and requires multiple trades. A single-trade contractor (class C-10 electrical, C-36 plumbing, etc.) cannot prime an ADU project as general; they must subcontract under a B-licensed prime, or the homeowner must act as their own owner-builder.
This is a necessary condition, not a sufficient one. ADU construction has specific code requirements (Title 24 energy compliance, fire sprinklers in most jurisdictions, soils reports on sloped lots, accessibility provisions for JADUs) that not every B-licensed contractor has experience with. Ask for at least three completed ADU project references before committing.
Before signing a contract with Apex Adu or any builder, verify each of the following independently:
BackyardADU is an independent reference site. Apex Adu has not paid us to be listed. We do not endorse, rank, or vouch for the quality of any contractor's work. The profile above is derived from public CSLB Public Data Portal data (April 28, 2026 snapshot) and is provided as a starting point for your own diligence. The CSLB Instant License Check linked above is the authoritative source for current status.
If you're Apex Adu and want to update or remove this profile, contact hello@backyardadu.net. We respond to verifiable owner requests within 24 hours.