Raising a Cottage and Installing an ICF Foundation in Ontario: A Professional Guide

The project in four stages

Every cottage-lift-and-refoundation job follows the same arc, and the order matters. Rushing a stage – especially concrete cure time – is how projects go sideways.

1. Lift. Steel beams and synchronized hydraulic jacks raise the cottage a few inches at a time onto timber cribbing, high enough to work underneath.
2. Remove and excavate. The old block piers, walls, and any slab come out, and the crew digs below the frost line for new footings.
3. Rebuild. New footings, ICF walls, waterproofing and drainage, then a new insulated floor slab (with radiant tubing if you want a warm floor).
4. Lower and reconnect. Once the concrete has cured, the cottage is set down onto anchored sill plates and tied to the new foundation, then utilities are reconnected.

Stage 1: Planning and preparation

Stage 2: Lifting the cottage

This is the part that looks alarming and is pure engineering. Experienced house movers slide long steel I-beams under the cottage (often through openings cut in the skirting or old wall), then raise it with synchronized hydraulic jacks controlled from one point to keep the whole building level.

• Jack and crib, over and over. The house comes up only a few inches at a time – best practice is no more than about 6 inches per jack station – then timber cribbing is stacked under the beams to hold the gain before the jacks reset. At any pause, the cottage rests on the cribbing, not the jacks.
• Constant leveling. Dozens of points are measured to avoid twisting the frame. Most lifts go just high enough to work underneath (often 3 to 8 ft); a full new basement can mean a much taller lift.
• Then it waits. At final height the cottage sits on cribbing and beams for the duration of the foundation work, monitored for stability, with an open workspace beneath.

Stage 3: Removing the old foundation and excavating

With the cottage supported overhead, the old block piers or walls and any concrete slab come out. Crews knock down masonry course by course, break up and haul out the old slab, then excavate to the required depth for the new footings – often with a mini-excavator driven under the raised house, or dug from the sides if the lift is high enough.

All the broken concrete and block is binned and hauled to a recycler or landfill, and disposal fees are part of the budget. Cribbing towers are placed just clear of the new wall line so digging can proceed around them; any support in the way of a new wall is relocated once enough of the foundation is built to take the load.

Stage 4: Installing the new ICF foundation

This is the core of the job – a steel-reinforced concrete wall built inside stay-in-place foam forms, so it comes insulated. The sequence:

1. Footings. Concrete footings are poured below frost depth with rebar per the engineering. An inspector usually checks the footing forms and rebar before the pour, and the footing cures before the walls go up.
2. Stack the ICF blocks. The foam forms interlock like large hollow blocks, stacked in a staggered running bond along a chalk line on the footing. Window, vent, beam-pocket, and service openings are boxed out as the wall rises.
3. Reinforce and brace. Vertical and horizontal rebar goes in per the engineer’s design (the OBC sets minimum rebar size and spacing for ICF walls), then a bracing and scaffold system keeps the walls plumb for the pour.
4. Pour the walls. A pump truck places the concrete (commonly 25 MPa or higher) in lifts to control form pressure, vibrated to remove voids. Anchor bolts or straps for the sill plate are set into the wet top of the wall. Then it cures – often around 10 days before the cottage can come back down.
5. Waterproof and drain. The below-grade foam gets a damp-proofing membrane or drainage board, and a perimeter weeping tile at footing level leads to a sump or daylight – critical for Ontario’s wet, near-water lots.
6. Backfill. Clear stone around the weeping tile, then soil filled and compacted in layers, with bracing left on until enough backfill is placed to protect the new walls.

Stage 5: The new floor slab (and optional radiant heat)

Inside the new foundation, the crew levels the ground, lays a compacted gravel base, then rigid under-slab insulation (often 2 in / R-10) and a 6 mil poly vapour barrier – both expected by the code and good practice, especially for a heated slab. Ontario’s radon rules also mean a sub-slab depressurization rough-in (a perforated pipe in the gravel to a capped riser) goes in at this stage.

If you want a warm floor, this is when PEX radiant tubing is laid in a serpentine pattern (typically 6 to 12 in spacing), tied down and pressure-tested before the pour. Ready-mix concrete – usually a 4 in slab – is placed over the insulation, vapour barrier, and tubing, screeded, and finished, then cured (walkable in a day or two, full strength around 28 days).

Stage 6: Lowering and reattaching the cottage

Once the walls and slab have cured, the movers reverse the process – setting treated sill plates on the new walls, then lowering the cottage in small increments onto them while monitoring every side to keep it level. The framing is anchored to the sill plate and foundation (bolts tightened, straps fastened), gaps are shimmed and sealed, beams and jacks come out, and the openings cut for the beams are patched.

After the cottage is seated, plumbers and electricians run new lines through the foundation, the basement can be insulated and finished, and the lot is regraded and repaired. The lowering is normally included in the lifting contract; utility reconnection and interior finishing are separate lines.

What it costs in Ontario (2026)

Every cottage and lot is different, but here is a realistic breakdown of professional charges. Ranges reflect 2026 Ontario market data – confirm with detailed quotes.

Comprehensive projects that include a full excavated basement can run higher still. Land access (island, tight road, remote lot) and soil surprises are the biggest swing factors. To slot these figures into a whole-project budget, use our home construction estimate spreadsheet.

Risks and challenges to plan for

Ontario code and permit considerations

This scope of work sits inside a well-defined regulatory framework. The main items your design and permit have to satisfy:

Raising a cottage: frequently asked questions

Disclaimer: costs are 2026 Ontario planning ranges that vary widely by cottage, lot, access, and site conditions, and code references are general guidance, not a code interpretation. This is an engineered, professionals-only project. Confirm design, cost, and current Ontario Building Code and permit requirements with a structural engineer, licensed contractors, and your local building department.

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