Quick Answer
Mississauga building permits cost a $185 base fee plus $14.20 per square metre of new floor area, with processing in 8–14 business days for residential additions. Applications go through the ePermits portal. Typical residential addition permits total $1,500–$2,800; new builds $3,800–$6,500.
Mississauga building permits run through the City of Mississauga's Building Division and the ePermits online portal. Permit fees are roughly 15–25% lower than Toronto's, processing timelines for residential additions average 8–14 business days, and Mississauga's online portal gives one of the smoothest application experiences in the GTA. This guide covers Mississauga-specific fees, document requirements, the ePermits process, common reasons permits get returned, and exempt work. All fees and timelines reflect Mississauga's published Building Permit Fees By-law 0019-2024 as amended.
Konstruction Group files 60–80 Mississauga permits per year across additions, garden suites, and new builds.
Mississauga Building Permit Fees 2026
Mississauga charges a base permit fee plus a per-square-metre rate based on construction class. New single-family residential is rated at $14.20/m² gross floor area, additions at $14.20/m² of new floor area, and basement finishes at $9.40/m². Mississauga adds a 4% Building Code Act administrative fee on top of the base permit calculation. Missed inspection re-inspection fees are $158/visit; permit revisions during construction are $206 plus $14.20/m² for any added floor area.
Garden suite permits in Mississauga run roughly $1,000–$1,600 total for a typical 60–80 m² unit.
| Project Type | Base Fee | Variable Component | Typical Total |
|---|---|---|---|
| New single-family detached | $185.00 | $14.20/m² gross | $3,800–$6,500 |
| Addition (rear or side) | $185.00 | $14.20/m² new floor area | $1,500–$2,800 |
| Garden suite | $185.00 | $14.20/m² | $1,000–$1,600 |
| Basement finish (no second unit) | $185.00 | $9.40/m² | $650–$1,200 |
| Additional Residential Unit registration | $185.00 | Flat $824 | $1,009 |
| Interior alteration | $185.00 | $7.40/m² affected | $320–$700 |
| Demolition (residential) | $185.00 | Flat $185 | $370 |
Required Documents for Mississauga Permits
Mississauga Building Division requires a sealed drawing set from a BCIN-registered designer or P.Eng.
The standard package for an addition or new build includes:
- site plan showing setbacks, lot coverage, and building separation
- architectural drawings at 1:50 with floor plans, elevations, and sections
- structural drawings sealed by a P.Eng for any new beams, headers, footings, or load-bearing wall removal
- mechanical/HVAC layout with heat-loss/heat-gain calculations
- OBC SB-12 energy compliance package
- Ontario Building Code matrix
- Tree Inventory and Preservation Plan if any tree exceeds 30 cm DBH or your lot is in a Treed area zone
Mississauga's ePermits portal (mississauga.ca/epermits) accepts digitally-sealed PDFs and processes payment online. The portal supports application status tracking and inspection booking, and most communications happen through the portal rather than email.
The Mississauga Permit Process Step by Step
- Zoning compliance check, Mississauga's zoning by-law 0225-2007 governs setbacks, height, and lot coverage; book a free Pre-Application Meeting with Planning if your project tests any limits.
- Submit application via ePermits, upload all sealed drawings, the Building Permit Application form, and zoning compliance information; pay 50% deposit on submission.
- Plan review (8–14 business days), Building Division examiners review for OBC, zoning, and Site Plan Control compliance; large or complex projects (>500 m²) may trigger SPC review separately.
- Deficiency response, about 50% of first submissions in Mississauga get a deficiency letter; address items and resubmit through the portal.
- Permit issuance, pay balance; download permit card; post on site.
- Construction inspections, book through ePermits portal; standard residential project requires 6–8 inspections from footings through final.
- Final inspection and occupancy, required for new dwelling units before occupancy.
Processing Timelines in Mississauga
Mississauga's average first-review turnaround for 2025–2026 has been 8–14 business days for residential additions and basement finishes, and 12–18 business days for new builds. The City consistently meets or beats the Building Code Act statutory targets (10 business days for houses, 15 for small buildings). Garden suite permits typically issue in 6–10 business days because Mississauga aligned its Additional Residential Units by-law (0021-2024) with provincial Bill 23 and removed most discretionary review.
Site Plan Control triggers (typically projects over 500 m² gross) add 6–12 weeks for the SPC review on top of the building permit clock. Expect total time from complete application to permit in hand of 4–8 weeks for a typical addition, 3–5 weeks for a garden suite, and 8–16 weeks for a new build with no SPC trigger.
Common Reasons Mississauga Permits Get Rejected
Mississauga's first-submission deficiency rate runs around 50%, better than Toronto's 60% but still high.
Top rejection reasons we see at Konstruction Group:
- zoning by-law 0225-2007 non-compliance, most common is rear-yard setback at 7.5 m for additions
- missing P.Eng seal on structural drawings
- Tree Inventory and Preservation Plan missing for lots with mature trees
- site plan dimensions not matching architectural
- missing OBC SB-12 energy package
- Additional Residential Unit applications missing the Fire Safety Plan or fire separation details on shared walls
- garden suite applications missing the rear-yard amenity space calculation.
Mississauga is stricter than Toronto on tree preservation, even trees on neighbouring lots within 6 m of construction need protection plans, and missing this is a frequent cause of plan rejection.
When You Don't Need a Mississauga Building Permit
Mississauga's permit-exempt work largely mirrors the OBC general exemptions: like-for-like finish replacement (drywall, flooring, paint, cabinetry); window and door replacement in the same opening size; minor plumbing fixture changes; sheds under 15 m² with no plumbing or electrical; decks at grade with no roof and no attachment; fences under 2 m in residential rear yards. Mississauga-specific differences from Toronto: sheds are exempt up to 15 m² (vs.
Toronto's 10 m²); pool fencing is exempt for fences ≥1.2 m around pools but the pool itself needs a separate Pool Enclosure Permit; market retaining walls are exempt under 600 mm in height. Driveway widening requires a separate Boulevard Permit even though no building permit applies. Electrical work requires ESA notification separately. Always confirm with Mississauga's Zoning By-law lookup before assuming exempt status.
More Resources
Sources & Methodology
Mississauga building permit fees verified against By-law 0019-2024 as amended. Processing timelines and deficiency rates based on Konstruction Group filing 60–80 Mississauga permits annually 2020–2026.
Researched & reviewed by
Fadi MamarCo-founder, Konstruction Group Inc
Engineering graduate from Toronto Metropolitan University with 14+ years in Toronto construction. Has overseen 500+ residential and commercial framing, insulation, and drywall projects across the GTA.
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