Quality control ensures construction work meets specifications and building codes. Inspections occur at various stages from initial site preparation through final completion. Manufacturer representatives may inspect their products during installation. Concrete testing verifies slump, strength, and air content before placement. Compaction testing verifies soil has reached required density. Rebar placement inspections confirm reinforcement is correctly positioned. Electrical inspections verify wire sizing, grounding, and safe installation. Plumbing inspections verify pipe sizing, slope, and venting. Framing inspections verify structural integrity. Building official inspections verify compliance with building codes. Footing inspections occur before concrete is poured. Foundation wall inspections verify reinforcement and waterproofing before backfill. Rough-in inspections occur before walls are closed. Final inspections occur before occupancy. Third-party inspection agencies may conduct independent inspections. Some projects require special inspections by licensed inspectors. Inspection documentation records what was inspected and findings. Deficiencies noted must be corrected before proceeding. Non-compliance issues may require design changes and re-inspection. Quality assurance programs establish procedures and standards. Testing of materials and workmanship documents quality. Ongoing quality improvements address systemic issues. Problem-solving processes identify root causes of quality issues. Corrective actions prevent recurrence. Documentation of quality becomes important if disputes arise.