Tontz Construction at 118 B Avenue in Coronado holds CSLB license 865920 for general building, with 13 permitted projects on file including active residential remodels across the island's historic Village core and the Coronado Beach South district. Luxury estate restoration and high-end residential remodeling drive the firm's scope, and kitchen and bathroom renovations on Orange Avenue properties typically require coordinated electrical rough-in through Coronado Electrician Pros for recessed lighting circuits, GFCI outlet upgrades, and panel capacity expansions. Recent City of Coronado permit records show the firm pulling building, mechanical, and plumbing permits simultaneously for projects at addresses on F Avenue, J Avenue, and Tenth Street — a multi-trade coordination pattern that reflects full-scope renovation rather than single-trade patchwork. Plumbing rough-in for freestanding soaking tubs, pot-filler lines, and multi-head shower systems routes through subcontractors such as ATL Plumbing & Sewer Line to meet California Plumbing Code requirements in Coronado's pre-war housing stock. Construction specifications on the firm's island remodels include marine-grade stainless-steel fasteners, fiber-cement exterior trim rated for ASTM salt-spray exposure, and seismic retrofit hardware for 1920s-era balloon-frame residences in the 92118 ZIP code. Coronado Island's compact geography means every residential and commercial address in the 92118 ZIP sits within a short drive or walk of the Coronado Bridge approach, the Orange Avenue village core, and the Coronado Ferry Landing bayfront. Coronado Beach-adjacent properties along the island's western edge face the highest salt-air corrosion rates in the 92118 ZIP, making marine-grade finish specifications and corrosion-resistant hardware a baseline requirement on every permitted renovation scope.