Introduction
Walnut is a residential community known for its top-rated schools, large lot sizes, and family-oriented neighborhoods. These characteristics make it one of the best cities in the San Gabriel Valley for ADU construction. Uni Construction is based in neighboring Diamond Bar and has designed ADUs on properties throughout Walnut.
Why Walnut Homeowners Build ADUs
Large lots = maximum flexibility: Walnut properties commonly sit on 8,000–20,000+ sq ft lots, giving you room for a full 1,200 sq ft detached ADU with space to spare.
Top school district: Walnut Valley USD is one of the highest-rated districts in California. ADU renters with school-age children will pay premium rents to live in this district.
Multigenerational family living: Walnut’s family-oriented community makes ADUs a natural fit for housing parents, adult children, or live-in caretakers.
Property value premium: Walnut’s high property values mean a well-designed ADU adds significant equity — often $150K–$250K+ in appraised value.
Local Permitting
Walnut has its own Planning Department that reviews ADU permits. The city follows California state ADU law and processes permits within the mandated 60-day timeline. Walnut’s residential zoning is primarily R-1, and ADUs are allowed on all residentially-zoned lots.
Neighborhoods We Serve
We serve all Walnut neighborhoods including areas near Suzanne Middle School, Lemon Creek Park, Snow Creek, the neighborhoods along Grand Avenue, and the residential areas near Mt. San Antonio College.
Ready to build an ADU in Walnut? Contact us for a free feasibility report — we’ll evaluate your property and show you what’s possible. admin@uni-cm.com
