1200 sq ft ADU Plan – Permit Ready

A 1200 sq ft single-story ADU with two bedrooms and a balanced public/private layout, designed for long-term tenant or family use. The layout configures 2 bedrooms and 2.5 baths within a clean, code-aware envelope. Built for a long-term rental that competes with primary-residence livability, a multi-generational annex, or a stairs-free retirement home. The plan includes a covered porch.

Front 3D isometric rendering of a 1200 sq ft 2-bedroom 1-story ADU plan in California — Exterior rendering of the 1200 sq ft permit-ready ADU plan designed as a detached backyard cottage.

Plan A12-1200 Specifications

Base area	1,200 sq ft
Bedrooms	2 Bedrooms
Bathrooms	2.5 Bath
Stories	1-Story
Ridge height	16 ft
Roof slope	2:12 & 3:12
Covered porch	138 sq ft

Code & Engineering

Delivered as a permit-ready architectural plan set, this 1200 sq ft single-story ADU configures 2 bedrooms and 2.5 baths for California parcels eligible under the state's detached-ADU statute.

The architectural plan set comprises the floor plan, 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.

Structural design is delivered as a separate scope through the optional Structural Set package; the package is tailored to the parcel's seismic site class and wind exposure and includes shear-wall layout, holdown selection, and connection design.

The foundation system is selected during a separate site-specific design scope. Slab-on-grade is the default for level, well-drained parcels; raised crawl-space on continuous stem walls is the choice on expansive-clay or high-moisture sites; pier-and-grade-beam systems handle hillside lots and soft-soil regions where the geotechnical report calls for deeper bearing.

The plan's 16 ft ridge height fits within California's standard 16-foot detached-ADU height limit on any standard parcel — no special transit or zoning eligibility required. Side and rear setbacks of 4 feet are respected, and the plan is designed for ministerial review under §65852.2. For sites with stricter local height overlays (HOAs, hillside districts), plan customization is available to lower the ridge further if needed.

Add-on services available alongside the architectural plan set include: structural calculations stamped by a licensed PE, plan customization (adjusting roof slope to fit local height limits, revising elevation, modifying floor layout), custom foundation design matched to the soils report, on-site structural observation, and permit support for non-standard correction comments.