ADU Builder in Winchester, California

Your local ADU builder in Winchester

Just southeast of Menifee, Winchester's larger lots and growing neighborhoods make it excellent ADU territory. Whether you want a detached rental, an attached suite for family, or a quick garage conversion, we bring the same licensed, in-house crew to Winchester that we do across Menifee.

Winchester's county jurisdiction has its own submittal requirements and timelines. Having built throughout Riverside County, we prepare plans to the county's standards and shepherd them through plan check so your project keeps moving.

Every ADU type, built locally

Whatever fits your lot and budget, we design, permit, and build it with our own crew:

• Detached ADUs — standalone backyard units from 500–1,500 sq ft, the highest-income option ($140K–$280K).
• Garage conversions — the fastest, lowest-cost route at $60K–$120K in 3–5 months.
• Junior ADUs (JADU) — up to 500 sq ft within your existing home, from $30K–$70K.
• Attached ADUs — up to 1,200 sq ft with a private entrance, ideal for multigenerational families.

Permitting for Winchester ADUs

Winchester is largely unincorporated Riverside County, so most Winchester ADU permits are handled through Riverside County rather than the City of Menifee — we manage the county submittal for you. We prepare the full permit package — structural details and California Title 24 energy compliance included — and carry it through plan check and inspections so you never have to navigate the counter alone. If you want the most predictable path, ask us about the City of Menifee Permit-Ready ADU (PRADU) program, which uses pre-approved plans to speed up approval.

Why Winchester homeowners choose Full Circle Builders

We are a licensed California general contractor (CSLB #1009685) headquartered nearby in Temecula since 2004, and we self-perform every trade — foundation, framing, mechanical, electrical, plumbing, and finishes — rather than handing your project to a rotating set of subcontractors. That means one accountable team, a tighter schedule, and a 4.9-star average across 47 verified reviews. We serve Winchester including the French Valley area and the surrounding Menifee and Murrieta communities.

Frequently asked questions

Do you build ADUs in Winchester?

Yes. Winchester is part of our core service area. We design, permit, and build detached ADUs, garage conversions, JADUs, and attached ADUs for Winchester homeowners, all with our own licensed crew.

How much does an ADU cost in Winchester?

It depends on the type: garage conversions typically run $60,000–$120,000, JADUs $30,000–$70,000, attached ADUs $120,000–$200,000, and detached ADUs $140,000–$280,000. You receive a fixed written quote before any work starts.

Who handles the permits for a Winchester ADU?

We do. Winchester is largely unincorporated Riverside County, so most Winchester ADU permits are handled through Riverside County rather than the City of Menifee — we manage the county submittal for you. We manage the entire submittal, plan check, and inspection process for you.

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