50 Issues Found Including Foundation Depth & Habitable Room Violations

The project

A California ADU project submitted for plan review against the 2025 California Building Code. InspectMind analyzed the complete drawing set including architectural, structural, and specification documents, identifying critical deficiencies in foundation design, code compliance gaps, specification vs drawing conflicts, and extensive document coordination errors that would have caused immediate permit rejection and potentially dangerous construction.

Project type

ADU · 2025 CBC · California

Codes referenced: 2025 CA Building Code · CBC Section 1904 · CBC Section 1208 · ACI 318

Sample findings

1. Foundation Only 10" Below Grade vs 24" Required

   Critical

   18" foundation depth with 8" clearance to grade results in only 10" below exterior grade, 14 inches short of the 24" minimum specification requirement.

2. 2-1/2" Diameter Bolt Specified for Wood Framing

   Critical

   Detail specifies 2.5" diameter machine bolt for 3.5" wide wood members, physically impossible as the hole would remove most of the wood section. Likely typo for 1/2" diameter.

3. Bedroom Only 3'-0" Wide, Code Requires 7' Minimum

   Critical

   Section drawing shows bedroom at 3'-0" width and living room at 6'-2", both violate CBC Section 1208.1 requiring 7' minimum dimension for habitable spaces.

4. Conflicting Numerical and Graphic Scales

   Critical

   Title block shows 1/4"=1'-0" but graphic scale bar indicates 1/8"=1'-0". Dimensions would be half or double depending on which scale is used.

5. Drawing vs Spec Conflict: 5/8" vs 3/8" Sill Anchors

   High

   Shear wall schedule specifies 5/8" anchors but specification requires 3/8" diameter for existing slab-on-grade conditions, 66% larger than allowed.

6. 2500 PSI Concrete for Foundations, Code Requires 3000+ PSI

   High

   Footing schedule shows f'c=2500 psi but CBC Section 1904.1 requires minimum 3000 psi for R-3 foundations. Notes also conflict with 4500 psi requirement for S2 exposure.

7. Shear Wall Aspect Ratio 6:1 Exceeds 3.5:1 Limit

   High

   16" minimum shear wall width with 8' height creates 6:1 aspect ratio, significantly exceeding the code-allowable 3.5:1 maximum per SDPWS.

8. Moisture-Resistant Gypsum Board Prohibited Behind Shower Tile

   High

   Notes specify moisture-resistant gypsum for bathrooms, but CBC Section 2509.3 explicitly prohibits this behind tile in tub/shower areas, requires cement board.

Issue categories

Structural & Foundations

Foundation depth, shear walls, reinforcement placement, anchor specifications

Code Compliance

Concrete strength, 2025 CBC violations, seismic data, nail specifications

Document Coordination

Scale conflicts, cross-reference errors, outdated code citations, typos

Specifications Conflicts

Drawing vs spec anchor sizes, epoxy products, nail types, material grades

Architectural

Habitable room dimensions, skylight curbs, tile backer requirements

Multi-Discipline

Structural, Architectural, Mechanical, Electrical, Plumbing coordination

Value delivered

• 50 issues surfaced before permit submission
• 7 critical issues that would have halted construction
• Spec vs drawing conflicts identified systematically
• 2025 CBC compliance gaps flagged with code references
• Foundation depth deficiency caught before excavation
• Habitable room violations identified early