If you're planning any basement renovation, underpinning, or major waterproofing work in 2025, understanding these new building code requirements is crucial. At DrySpace Waterproofing, we've helped hundreds of Toronto homeowners navigate the permit process, and we're here to guide you through these important changes.
Major 2025 Building Code Changes
Professional Engineer Design Now Mandatory
All underpinning projects, regardless of depth, now require stamped drawings from a Professional Engineer (P.Eng). This represents a significant change from previous requirements that only applied to excavations deeper than 1.2 meters.
Enhanced Insulation Requirements
Basement walls now require minimum R-20 insulation (up from R-12), with specific vapor barrier placement requirements to prevent moisture issues common in Toronto's climate.
Neighbor Notification Protocol
Written notification to adjacent property owners is now required 30 days before excavation begins, with documented proof of delivery required for permit approval.
Complete Permit Cost Breakdown
| Permit Type | 2024 Cost | 2025 Cost | Notes |
|---|---|---|---|
| Building Permit Application | $400-$600 | $500-$800 | Base fee increased 25% |
| P.Eng Review (Now Mandatory) | Optional | $1,000-$1,500 | Required for all underpinning |
| Inspection Fees | $400-$500 | $500-$700 | Minimum 3 inspections required |
| Zoning Review | $150 | $200 | If creating rental unit |
| Total Typical Cost | $950-$1,250 | $2,200-$3,200 | 160% average increase |
Permit Application Timeline
Week 1-2: Pre-Application
Hire P.Eng, complete site survey, prepare initial drawings
Week 3-4: Application Submission
Submit complete package, pay fees, receive file number
Week 5-8: City Review
Examiner review, potential revision requests
Week 9-10: Approval
Final approval, permit issuance, work can begin
Common Permit Pitfalls Causing Delays
1. Incomplete Engineering Drawings
The #1 reason for permit rejection in 2025. Ensure your P.Eng provides:
- Detailed excavation sequencing plan
- Shoring and bracing calculations
- Monitoring program for adjacent structures
- Drainage and waterproofing details
2. Missing Neighbor Agreements
New requirements include:
- Party Wall Agreements for shared walls
- Access agreements if equipment needs neighbor's property
- Pre-construction condition surveys
3. Inadequate Insurance Documentation
Contractors must now provide:
- $5 million liability insurance (up from $2 million)
- Course of construction insurance
- WSIB clearance certificates
Permit Application Checklist
Specific Requirements by Project Type
Basement Lowering/Underpinning
- Minimum ceiling height: 6'5" (1.95m) for habitable space
- Mandatory bench footing if excavating near property line
- Vibration monitoring required for adjacent structures
- Daily inspection logs must be maintained
Waterproofing Projects
- Exterior waterproofing requires full permit if excavation >0.6m
- New drainage must connect to approved storm system
- Backfill must meet new compaction standards
- Warranty documentation required for permit close-out
Creating Rental Units
- Separate entrance required with specific dimensions
- Fire separation requirements increased
- Parking requirements may trigger Committee of Adjustment
- Second unit registration mandatory
How DrySpace Waterproofing Helps Navigate the New Requirements
We understand that these new regulations can seem overwhelming. That's why we offer comprehensive permit assistance services:
- Pre-approved P.Eng Network: We work with engineers familiar with Toronto's requirements
- Permit Package Preparation: Our team assembles all required documentation
- City Liaison Services: We handle communications with city examiners
- Expedited Processing: Our established relationships help avoid common delays
- Compliance Guarantee: We ensure your project meets all 2025 requirements
Get Expert Permit Assistance
Don't let complex regulations delay your project. Our permit specialists will guide you through every step.
Stay Compliant, Avoid Delays
The 2025 building code changes represent the most significant update to basement construction requirements in over a decade. While the new requirements add complexity and cost, they're designed to ensure safer, more resilient homes in Toronto's challenging climate.
With proper planning and expert guidance, your project can proceed smoothly through the permit process. Contact DrySpace Waterproofing today to ensure your basement project meets all 2025 requirements while avoiding costly delays and compliance issues.