The site work division of ICFHome.ca · Building since 1979 · Insured to $2,000,000 · 705-533-1633
Excavation2026Tiny, Oro-Medonte, Wasaga, Midland, Collingwood
Footing Depth and Frost in Simcoe County
Plan on 1.2 m (4 ft) below finished grade for footings in Simcoe County: that is the code minimum for clay and uncertain soils, and local building departments such as Wasaga Beach and Oro-Medonte ask for 48 inches on deck piers. Water lines generally go deeper, around 1.5 to 1.8 m. Here is why, when the rules change, and how winter digging fits in.
Updated October 2026 · Georgian Bay Siteworks, the site work division of ICFHome.ca
Insured to $2,000,000Site work division of ICFHome.caBuilding since 1979250+ projects in Simcoe County
Why Frost Depth Matters at All
Water in soil freezes, expands and lifts whatever is sitting on it. A footing above the frost line rides up in February and drops back in April, a little out of place every year. Doors stick, drywall cracks, and the deck pulls away from the house like it is trying to leave.
Put the footing below where frost reaches and the soil under it never freezes, so it never heaves. That is the whole idea behind minimum footing depth.
What the Code Table Says
The building code sets minimum foundation depths in Table 9.12.2.2 based on soil type, drainage and whether the space beside the footing is heated. The summary below is taken from a published Canadian edition of the Part 9 table, and Ontario’s code uses the same table number. Check the current Ontario Building Code with your building department for the exact wording.
| Soil | Heated basement or crawlspace | No heated space (garage, porch, deck) |
|---|---|---|
| Sound rock | No minimum | No minimum |
| Coarse sand and gravel, well drained | No minimum | No minimum if well drained; frost depth if poorly drained |
| Silt | No minimum | Depth of frost penetration |
| Clay or soil not clearly identified | 1.2 m | 1.2 m or frost depth, whichever is greater |
In real life most of our building departments simply ask for 1.2 m. Wasaga Beach’s deck permit package says footings must bear on undisturbed soil at least 48 inches below grade, and Oro-Medonte’s deck guide calls for piers at least 4 feet below grade. BuildersOntario’s deck footings guide puts Simcoe County frost depth at about 1.2 to 1.5 m, so some sites go deeper.
Builder truth: “my buddy did his at 3 feet and it is fine” is how a lot of heaved decks start. The inspector will not care about your buddy.
Water Lines Go Deeper Than Footings
A footing only has to keep its bottom out of frost. A water line has to keep the water inside it liquid, which is a harder job, so it gets buried deeper. Barrie’s municipal standard calls for water service trenches a minimum of 1.7 m deep from final grade.
For a well line on a rural lot we treat 1.5 to 1.8 m as normal, deeper under driveways and plowed areas where the snow cover gets scraped off and frost drives down further. Your well contractor sets the depth at the well end, so we match the trench to it.
- Keep water lines under driveways, parking pads and paths deeper or insulated. No snow blanket means deeper frost.
- Do not run a water line through a shallow rock trench without a plan. Rock carries frost well.
- Bed the pipe in sand, not rocks, and record the route on a sketch with measurements.
More on service trenches in our trenching services page.
Frost-Protected Shallow Foundations and ICF
Shallow, but insulated
A frost-protected shallow foundation uses rigid insulation laid out sideways around the footing to keep the ground under it from freezing. The code allows lesser depths where a foundation is designed for them, so this needs a designer and building department sign-off. It is not a do-it-yourself shortcut.
ICF footings
ICF walls sit on normal concrete footings at normal depth, but the insulated walls change how the house loses heat to the soil. Our parent company ICFHome.ca has built on ICF for decades. Plan the over-dig around the footings so the crew can work.
Garages and porches
Unheated spaces get the stricter column of the table. A garage on clay needs full frost depth even though the house next to it has a heated basement.
Digging and Backfilling in Winter
You can dig footings in winter here, and we do. The rules are just less forgiving.
- Never pour on frozen ground. Footings go on undisturbed, unfrozen soil. Inspectors will not pass frozen subgrade.
- Cover the hole. Insulated blankets or straw over the footing area stop frost from driving in overnight between dig and pour.
- Protect fresh concrete. Blankets or heat until it cures. Frozen concrete is weak concrete.
- No frozen backfill. Frozen lumps leave voids that settle in spring, and they can push on fresh walls. Backfill with unfrozen material or wait.
- Expect to pay more. Heat, blankets, frost ripping and slower work can add noticeably to a winter dig. See the best time of year for site work.
Send Plans for Review Before You Dig
Send us your drawings and soil info and we will flag footing depth, over-dig and water line routing before the machine shows up.
Related guides
Frequently Asked Questions
How deep do footings need to be in Simcoe County?
Plan on at least 1.2 m (4 ft) below finished grade. That is the code minimum for clay and uncertain soils, and local departments such as Wasaga Beach and Oro-Medonte ask for 48 inches on deck piers.
What is the frost depth in Simcoe County?
Roughly 1.2 to 1.5 m depending on soil, snow cover and exposure. Your building department has the final word for your lot.
How deep should a water line be buried?
Deeper than footings. Barrie’s standard is a minimum 1.7 m trench for water services, and on rural lots we treat 1.5 to 1.8 m as normal, deeper under driveways.
Can footings on sand be shallower?
The code table allows it next to heated space in well-drained coarse soils, but most local departments still ask for 1.2 m. Ask before you design around a shallower footing.
Are frost-protected shallow foundations allowed in Ontario?
The code allows lesser depths where a foundation is designed for them, so an insulated shallow foundation needs a designer and building department approval. It is not a default option.
Can you pour footings in winter?
Yes, as long as the soil under them is not frozen and the concrete is protected while it cures. Expect extra cost for blankets, heat and slower work.
Can I backfill with frozen soil?
No. Frozen lumps leave voids that settle when they thaw and can push on new walls. Use unfrozen material or wait.
