REQUIRED KNOWLEDGE, SKILLS, AND ABILITIES: Thorough knowledge of building construction and alterations, including plumbing and mechanical systems; thorough knowledge of the techniques and principles in reading and interpreting plans, specifications, and blueprints accurately; good knowledge of codes and ordinances relating to construction; ability to perform mathematical calculations necessary to compute estimated valuation of building projects; ability to design and size mechanical systems and ventilation; ability to use appropriate engineering tables to verify the adequacy of proposed load bearing members in structures; ability to maintain current knowledge of technical developments in the construction field; ability to communicate courteously and effectively, both verbally and in writing; ability to establish and maintain effective working relationships with architects, engineers, contractors, and the public on problems of a technical nature; ability to maintain accurate records. Reviews and approves construction, plumbing, and mechanical plans and permit applications to assure compliance with all applicable New Castle County codes; Reviews literature, publications, and manufacturer installation instructions to maintain current knowledge of new equipment, techniques, technical developments, and engineered systems in the construction, plumbing, and mechanical fields.