ADU CITIES Contractor Directory

Retaining Walls Company

Also listed as: Sper Contracting Corporation

● Active — license status verified against CSLB public data as of November 6, 2026

☎ Call (760) 471-2500Verify this license at CSLB
CSLB license#825441
ClassificationsA — General Engineering
Office of recordP O Box 502908
San Diego, CA 92150
Address as listed in the CSLB record — the office of record, not a service-area claim.
Phone (CSLB record)(760) 471-2500
Contractor bond$25,000 — American Contractors Indemnity Company
Workers' comp (CSLB record)Workers' Compensation Insurance — Benchmark Insurance Company
Business typeCorporation
License issuedOctober 3, 2003
License expiresOctober 31, 2027

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Data source: CSLB public records as of November 6, 2026. License status can change at any time — verify live at CSLB before signing a contract.