On Alpine's Peutz Valley Road, Summers Construction holds CSLB license #798728 under the B general building classification for custom residential projects in the 91901 ZIP code. New home builds in Alpine's hillside terrain require plumbing rough-in and lateral connections that coordinate with contractors such as McGuire Plumbing Inc. on Alpine Boulevard. The company's 15 permitted projects on record with San Diego County span single-family ground-up construction and residential additions on the variable-grade lots characteristic of the Peutz Valley and Japatul Valley corridors. Roof system installation is a sequential phase that connects the framing stage to weatherproofing, a handoff shared with Linden Roofing Services on Alpine Boulevard. Highest-complexity builds in Alpine's backcountry parcels require engineered septic systems, fire-resistant exterior assemblies compliant with San Diego County WUI codes, and stepped foundation designs accommodating slope differentials exceeding 30 percent.