1084 sq ft ADU Plan – Permit Ready

A 1084 sq ft two-story two-bedroom ADU that fits full primary-residence livability on a narrow-lot footprint. The layout configures 2 bedrooms and 1.5 baths within a clean, code-aware envelope. Configured for narrow lots where preserving backyard or driveway space matters, and for buyers who want a true two-bedroom rental without sacrificing yard. The plan includes a covered porch.

Front 3D isometric rendering of a 1084 sq ft 2-bedroom 2-story ADU plan in California — Exterior rendering of the 1084 sq ft permit-ready ADU plan designed as a detached backyard cottage.

Plan A22-1084 Specifications

Base area	1,084 sq ft
Bedrooms	2 Bedrooms
Bathrooms	1.5 Bath
Stories	2-Story
Ridge height	23 ft
Ceiling height	8.5 ft
Roof slope	4:12
Covered porch	26 sq ft

Code & Engineering

This 1084 sq ft 2-bedroom two-story ADU is delivered as a complete architectural plan set for permit-ready construction in California, developed against the requirements of Government Code §65852.2 and the supporting provisions in §65852.22.

The architectural plan set comprises the floor plans for both stories, exterior elevations, sections capturing the roof-line and interior heights, and dimensioned framing intent. The design follows the California Residential Code (CRC) and is engineered for structural detailing per ASCE 7 and the NDS.

The Structural Set package is offered as a separate scope and includes lateral analysis, gravity load takedown, shear-wall design, and component-level connection details — all sized to the specific site's seismic and wind conditions rather than to a generic California average.

Foundation design is provided as a separate scope to match the right system to each site. Common alternates include slab-on-grade for stable parcels, shallow crawl-space on stem walls for expansive-clay or moisture-prone sites, and pier-and-grade-beam systems for hillside lots, soft soils, or any site where the geotechnical report identifies a need for deeper bearing.

The plan's 23 ft ridge height exceeds California's standard 16-foot detached-ADU limit and the 18-foot transit-served / multifamily-zoned allowance. Several adaptations are available depending on your parcel: plan customization to lower the roof slope or revise the upper-floor elevation so the ridge fits the applicable height limit; configuration as an attached ADU where height matches the primary dwelling up to 25 feet; use as a small single-family residence in a zone permitting two-story construction; or permitting on parcels where local jurisdictional provisions allow greater height for detached secondary units. Plan customization is offered as an optional design service to adapt the plan to a specific parcel.

Available optional services: PE-stamped structural calculations, plan customization for site-specific adaptations (roof slope, elevation, interior layout), custom foundation design sized to the geotechnical report, structural observation visits during framing and finish, and permit support tailored to jurisdiction-specific requirements.