A & D QUALITY CONSTRUCTION CO L.L.C

A & D Quality Construction Co. L.L.C. specializes in precision civil construction and building maintenance services, with demonstrated expertise in grounding system installation and concrete slab repair. Their technical capabilities include subsurface utility work, structural concrete remediation, and electrical grounding system deployment—critical tasks requiring adherence to NFPA 780, ACI 318, and Department of Defense engineering standards. The contractor’s hands-on experience with slab repair under live utility conditions and grounding rod installation for critical infrastructure indicates a strong command of non-destructive evaluation techniques, moisture mitigation, and grounding electrode system design. Their ability to execute targeted, high-precision repairs under federal oversight suggests a focus on mission-critical infrastructure resilience rather than large-scale new construction. The company has delivered services directly to the Department of Defense and the Department of Commerce, indicating experience in both defense and federal administrative facility maintenance. For the DoD, they have performed specialized electrical safety upgrades involving grounding systems essential for lightning protection and equipment integrity. For the Department of Commerce, they executed structural repairs to concrete slabs and subsurface water leak remediation—tasks requiring coordination with plumbing, drainage, and structural systems. These engagements reflect a pattern of responding to urgent, low-profile infrastructure needs that demand technical accuracy and minimal disruption. Their primary industry focus lies in Highway, Street, and Bridge Construction (NAICS 237310) and Other Services to Buildings and Dwellings (NAICS 561790), positioning them as a niche provider of infrastructure maintenance and building envelope repair. They serve the federal built environment with a focus on durability, code compliance, and long-term asset preservation. A & D Quality Construction Co. L.L.C. is a small, locally based entity headquartered in Renton, Washington, operating under a 2L entity structure. While currently holding no formal government certifications, their consistent delivery of technical construction services to federal agencies demonstrates reliable performance in regulated environments. Their geographic footprint supports Pacific Northwest federal facility operations with a lean, responsive operational model.