Apply for Building Permits
With your design complete, it's time to submit your permit application. A complete submission with all required documents is the key to avoiding delays. Here's exactly what you need and how to navigate the process.
Quick Summary
Permit fees
$5,000-$20,000
Review time
4-16 weeks
Key requirement
Complete documents
Required Documents Checklist
Every city has slightly different requirements, but these documents are typically required for ADU permits. Missing any item can delay your application by weeks.
Architectural Plans
- • Site plan showing ADU location, setbacks, property lines
- • Floor plans with room dimensions and uses
- • Exterior elevations (all four sides)
- • Building sections showing ceiling heights
- • Roof plan with drainage
- • Door and window schedules
- • Finish schedules (materials specifications)
Engineering Documents
- • Structural engineering calculations (stamped)
- • Foundation design
- • Framing plans
- • Soils report (if required in your area)
- • Title 24 energy calculations (California) or energy code compliance
MEP Plans (Mechanical, Electrical, Plumbing)
- • Electrical plan with panel size, circuits, outlets
- • Plumbing plan with fixture locations, pipe sizes
- • HVAC plan showing equipment and duct layout
- • Gas piping plan (if applicable)
- • Load calculations for electrical and HVAC
Site-Specific Documents
- • Property survey (recent, within 5 years)
- • Topographic survey (if site has slope)
- • Tree survey (if protected trees exist)
- • Drainage/grading plan
- • Utility connection points marked
Administrative Documents
- • Completed permit application form
- • Property owner authorization (if not owner)
- • Proof of property ownership (deed or title)
- • HOA approval letter (if applicable)
- • School district fee receipt (some areas)
Understanding Permit Fees
Permit fees for ADUs typically range from $5,000 to $20,000 depending on location and project size. Here's what makes up that total:
| Fee Type | Typical Range | Notes |
|---|---|---|
| Plan check fee | $1,000-$3,000 | Based on project valuation |
| Building permit fee | $1,500-$5,000 | Based on sq footage |
| Impact fees | $0-$10,000+ | Waived in some states for ADUs |
| School fees | $0-$5,000 | Often waived for ADUs under 750 sq ft |
| Utility connection fees | $500-$3,000 | Sewer, water, electrical |
| Technology/records fee | $100-$500 | Administrative costs |
California homeowners: State law caps ADU permit fees and eliminates many impact fees for units under 750 sq ft. Verify current fee waivers with your city.
The Submission Process
Prepare Your Submission Package
Organize all documents according to city requirements. Many cities now accept digital submissions—check for file format and size requirements.
- • Verify required number of plan sets (typically 2-4)
- • Check plan sheet size requirements
- • Ensure all engineer stamps are current
- • Complete all application forms fully
Submit and Pay Fees
Submit your application online or in person. Plan check fees are typically due at submission; building permit fees at issuance.
Tip: If submitting in person, arrive early and bring a credit card. Some cities only accept checks—confirm payment methods.
Track Your Application
Get your permit number and track progress online. Most cities offer portal access to see which department is reviewing your plans.
- • Save your permit/tracking number immediately
- • Set up email notifications if available
- • Note the assigned plan checker's name
- • Mark expected review completion dates
Respond to Plan Check Comments
Most submissions receive correction comments. Review carefully, address every item, and resubmit promptly to maintain your place in queue.
- • Have your architect clarify unclear comments
- • Address EVERY comment, even minor ones
- • Reference comment numbers in your response
- • Cloud or highlight changes on revised plans
Permit Issuance
Once approved, pay remaining fees and receive your building permit. Post the permit visibly on site before starting construction.
- • Get approved plans stamped by city
- • Keep one set of approved plans on site always
- • Note permit expiration date (typically 1-2 years)
- • Understand required inspection schedule
Tips for Efficient Tracking
Check status weekly
Log into the permit portal every week to catch updates early.
Build relationships
A polite call to your plan checker can provide valuable insight.
Respond within 48 hours
Fast responses to comments keep your application moving.
Document everything
Keep copies of all communications and submissions.
Common Submission Issues
Incomplete Energy Calculations
Title 24 (California) or local energy code compliance is often incomplete or doesn't match the plans. Have your energy consultant coordinate with your architect.
Setback Discrepancies
Site plan setbacks must match architectural plans exactly. Use a recent survey and triple-check all dimensions before submitting.
Missing Fire Ratings
If your ADU is within 5 feet of property line or main house, fire-rated construction is required. Specify ratings clearly on plans.
Frequently Asked Questions
Can I submit permits myself or do I need my architect?
You can submit yourself, but many homeowners have their architect handle it. They know what the city expects and can respond to technical comments. Some architects include permit coordination in their fee; others charge extra.
What if my permit expires before construction is complete?
Most permits can be renewed for a fee before expiration. If expired, you may need to reapply under current codes, which could require plan changes. Keep construction moving to avoid this scenario.
Do I need separate permits for electrical, plumbing, and mechanical?
Usually these are included in your building permit as "sub-permits." However, your contractors may need to pull these permits themselves using their licenses. Confirm the process with your city and contractors.
Ready for the Next Step?
While your permit is in review, make sure your design addresses all fire safety and building code requirements to avoid costly revisions.