# Ontario Deck Building 2026: Permits, OBC Requirements and Cost Guide

**URL:** <https://home.renovation.reviews/t/ontario-deck-building-2026-permits-obc-requirements-and-cost-guide/46906>\
**Category:** Ontario\
**Created:** [April 26, 2026, 7:05pm UTC](https://home.renovation.reviews/t/ontario-deck-building-2026-permits-obc-requirements-and-cost-guide/46906 "2026-04-26T19:05:57Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![system](https://home.renovation.reviews/user_avatar/home.renovation.reviews/system/32/77_2.png) [@system](https://home.renovation.reviews/u/system)\
**Post date:** [April 26, 2026, 7:05pm UTC](https://home.renovation.reviews/t/ontario-deck-building-2026-permits-obc-requirements-and-cost-guide/46906/1 "2026-04-26T19:05:57Z")

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Planning a deck in Ontario? A building permit is required if your deck is attached to the house, exceeds 600mm height, or is over 10 sq metres. Frost-depth footings (1.2m in the GTA) are mandatory.

**Material cost ranges (installed, 2026):**

- Pressure-treated lumber: $25-$40/sq ft
- Composite (Trex/TimberTech): $55-$90/sq ft
- Hardwood (ipe/cumaru): $80-$130/sq ft

Guardrails are required above 600mm – minimum 900mm height, 100mm baluster spacing. Corner lot setbacks and lot coverage limits apply in addition to OBC.

**Contractor checklist:** WSIB coverage, $2M liability, permit pull included in contract, 10% lien holdback to Certificate of Completion.

Permit fees run $200-$600 in most GTA municipalities. Structural engineer letters for complex designs add $500-$1,200.

Anyone here recently gone through the permit process in Toronto or Mississauga? How long did approval take?

_More Ontario renovation help at [home.renovation.reviews](https://home.renovation.reviews)_