AntoineAsphalt.caDeck permit guide
Do You Need a Deck Permit in Hamilton, Burlington or Oakville?
In Hamilton and Oakville, any deck attached to the house needs a building permit, and detached decks need one once they pass size and height triggers — over 10 m² (about 108 sq ft) and more than 200 mm above grade in Hamilton, or over 10 m² and higher than 61 cm in Oakville. Burlington follows Ontario Building Code triggers. Confirm current requirements with your municipality before building.
In Hamilton and Oakville, any deck attached to the house needs a building permit, and detached decks need one once they pass size and height triggers — over 10 m² (about 108 sq ft) and more than 200 mm above grade in Hamilton, or over 10 m² and higher than 61 cm in Oakville. Burlington follows Ontario Building Code triggers. Confirm current requirements with your municipality before building.
This guide summarizes municipal information for planning only. It is not legal advice. Confirm current requirements with your municipality before building.
How do deck permit rules compare by city?
The table summarizes the main triggers. 10 m² is about 108 sq ft — roughly a 10 × 11 ft deck.
| Situation | Hamilton | Oakville | Burlington |
|---|---|---|---|
| Attached to the house | Permit required, any size | Permit required, any size | Commonly required — confirm |
| Detached, uncovered | Over 10 m² and more than 200 mm above grade | Over 10 m² and higher than 61 cm above grade | Commonly over 10 m² or more than 600 mm — confirm |
| Detached, covered | Over 10 m², regardless of height | Confirm with the Town | Confirm with the City |
| Small deck by a door | ≤10 m² by a door and more than 600 mm above grade | Confirm with the Town | Confirm with the City |
| New or replacement guards | Permit required | Confirm with the Town | Confirm with the City |
Confirm current requirements with your municipality before building.
When do you need a deck permit in Hamilton?
The City of Hamilton's porches and decks rules apply across Hamilton (incl. Ancaster, Dundas, Stoney Creek, Waterdown, Flamborough). A permit is required for any-sized deck or porch attached to a building; a detached uncovered deck or porch greater than 10 m² and more than 200 mm above adjacent grade; a detached covered deck or porch greater than 10 m² regardless of height; and a detached deck or porch of 10 m² or less that is adjacent to or associated with a door and more than 600 mm above adjacent grade.
Replacing guards or installing new guards also requires a permit. Where no permit is needed, zoning and other regulations still apply. Hamilton Building Division: 905-546-2720.
When do you need a deck permit in Oakville?
The Town of Oakville requires a permit for decks greater than 10 m² and higher than 61 cm above adjacent grade, and for any size of deck attached to a house. All decks must comply with the zoning by-law. Contact Ontario One Call (1-800-400-2255) before digging footings.
When do you need a deck permit in Burlington?
Burlington follows Ontario Building Code permit triggers. Commonly, a permit is needed for attached decks and for decks more than 600 mm above grade or over 10 m². Confirm with City of Burlington Building before you build, because site-specific conditions can change the answer.
Does my deck likely need a permit?
Answer a few questions for a quick planning indication based on the rules above. It is not a municipal decision.
If no permit is needed, can I build however I want?
No. Permit-exempt never means code-exempt. A deck that does not need a permit must still meet the Ontario Building Code and the zoning by-law.
- Guards are required where the walking surface is more than 600 mm above adjacent grade
- Footings should bear below frost depth — about 1.2 m / 4 ft here
- A ledger needs proper fastening and flashing
- Stairs must meet OBC rise, run and handrail rules
- Zoning setbacks and lot coverage still apply
What if my lot backs onto a creek or ravine?
Properties near creeks, ravines, valleys or shorelines may be regulated by a conservation authority in addition to the municipality. In Hamilton that is typically the Hamilton Conservation Authority; in Burlington and Oakville it is typically Conservation Halton. Check with the authority before designing, because a separate permission can be needed and can affect deck location and footing placement.
What do deck permit drawings usually show?
Municipalities want enough detail to confirm the deck is safe and fits the lot. We prepare drawings and handle the application where a permit is required.
- Site plan with property lines, setbacks and deck location
- Deck size, height above grade and stair locations
- Footing type, size, depth and spacing
- Beam, joist and post sizes and spans
- Ledger attachment and flashing, or freestanding framing
- Guard height, openings and handrail details
Frequently asked questions
How big can a deck be without a permit in Hamilton?
A detached, uncovered deck of 10 m² (about 108 sq ft) or less, or one 200 mm or less above adjacent grade, generally does not need a permit — unless it is attached, covered over 10 m², or by a door and more than 600 mm high. Confirm current requirements with your municipality before building.
Do I need a permit to replace my deck railing in Hamilton?
Yes. The City of Hamilton requires a permit to replace existing guards or install new ones.
Does Ancaster or Stoney Creek have different deck rules?
No. Ancaster, Dundas, Stoney Creek, Waterdown and Flamborough are part of the City of Hamilton and follow Hamilton's rules.
Does an attached deck always need a permit?
In Hamilton and Oakville, yes — any deck attached to a house needs a permit regardless of size. In Burlington, attached decks commonly need one; confirm with City of Burlington Building.
Do I need to call before digging deck footings?
Yes. Contact Ontario One Call (1-800-400-2255) for utility locates before any digging.
Who applies for the deck permit?
Where a permit is required, we prepare the drawings and handle the application as part of the project.
Related deck information
From guide to site plan
Get an on-site deck quote
Call (647) 459-7775 or send the essentials. Your exact price comes from an on-site quote.