Accessory Structure Permits: Sheds, Garages, and Workshops

Accessory structures like sheds, workshops, and detached garages enhance property functionality, but most require permits. Understanding size limits and code requirements helps avoid violations while maximizing your property's potential.

Permit Thresholds

When Permits Are NOT Required

Most jurisdictions exempt small structures:

• Sheds: Under 120 square feet
• Height: Single story only
• No utilities: No electrical/plumbing
• Non-habitable: Storage only
• Portable: Not on permanent foundation

Always Need Permits

• Any structure over 120 sq ft
• All electrical work
• Plumbing connections
• Permanent foundations
• Habitable spaces
• Two-story structures

Zoning Requirements

Setback Rules

• Rear setback: Typically 5 feet minimum
• Side setback: Usually 5 feet (varies)
• From main house: Often 6 feet minimum
• Corner lots: Additional restrictions

Lot Coverage Limits

• Total buildings typically 35-50% of lot
• Includes house, garage, structures
• Some areas count decks/patios
• Check specific zoning district

Height Restrictions

• Single story: Usually 12-15 feet
• Two story: Rarely allowed
• Measured from grade to peak
• May be lower near property lines

Building Code Requirements

Foundation Requirements

Based on structure size:

• Under 200 sq ft: Concrete blocks acceptable
• 200-400 sq ft: Continuous footing typical
• Over 400 sq ft: Engineered foundation
• Frost protection: Required in cold areas

Structural Standards

• Wind resistance per local requirements
• Seismic bracing in earthquake zones
• Snow loads in mountain areas
• Proper roof slopes for drainage

Specific Structure Types

Storage Sheds

Most common accessory structure:

• Pre-fab kits often acceptable
• Must meet wind resistance standards
• Anchoring required in high wind areas
• Consider door orientation for access

Detached Garages

More complex requirements:

• Minimum interior dimensions
• Proper vehicular door sizes
• Fire separation from property lines
• May need fire-rated construction

Workshops

Additional considerations:

• Electrical service typically required
• Adequate lighting and ventilation
• May need dust collection permits
• Noise ordinance compliance

Pool Houses

• Plumbing permits for bathrooms
• Cannot have kitchen facilities (usually)
• May convert to ADU potential
• Pool equipment noise considerations

Electrical Installations

Power Options

• Sub-panel: From main house panel
• Underground conduit: Required depth 18-24"
• Overhead lines: Minimum clearances apply
• Solar options: For off-grid structures

Code Requirements

• GFCI protection for all receptacles
• Proper grounding system
• Adequate circuit sizing
• Weatherproof components

Common Violations

Permit Process

Documentation Needed

• Site plan showing all structures
• Building plans with dimensions
• Foundation details
• Electrical plans (if applicable)

Typical Timeline

1. Plan preparation: 1-2 weeks
2. Permit review: 1-3 weeks
3. Construction: 1-4 weeks
4. Inspections: As scheduled

Cost Estimates

• Permit fees: $200-$1,000
• Basic shed (120-200 sq ft): $3,000-$6,000
• Detached garage: $20,000-$40,000
• Workshop with power: $10,000-$25,000
• Site prep/foundation: $1,500-$5,000

Tips for Success

• Check HOA rules before planning
• Consider future needs in sizing
• Plan for proper drainage
• Include adequate ventilation
• Think about security needs
• Design for easy maintenance access

Well-planned accessory structures add value and functionality to your property. Taking time to understand requirements and obtain proper permits ensures your investment is protected and compliant.