What is the cost to replace a basement floor in Saint John NB?

Replacing a basement floor in Saint John typically costs $8–$14 per square foot fully installed, putting a 600-square-foot basement floor replacement in the $4,800–$8,400 range. For a full 800–1,000 square foot basement, budget $6,500–$14,000 depending on conditions encountered.

That price range covers breaking out the old slab with a jackhammer, hauling away the debris, re-grading and compacting the gravel sub-base, pouring a new 4-inch reinforced concrete slab, and basic finishing. What can push costs higher includes significant sub-base issues (old fill, organic material, or an inadequate base that needs rebuilding), adding a drainage membrane or vapour barrier beneath the new slab, or raising the slab height to improve headroom.

Saint John-specific considerations are significant. Saint John sits on the Bay of Fundy and has some of the most variable and high water table conditions in NB. Many older homes in the South End, North End, and Loch Lomond areas have basement floors that sit at or near the water table seasonally. If a basement floor is lifted, cracked, or showing hydrostatic pressure (water seeping up through the floor rather than through walls), simply replacing the slab without addressing the drainage will result in the same problem within a few years.

Before quoting a floor replacement, a reputable contractor will check whether a sub-slab drainage system (a dimple mat or perforated pipe in gravel connected to a sump) is warranted. Adding this drainage layer during floor replacement costs $2–$5 per square foot more but is far cheaper than doing it after the new slab is poured. If you're already tearing up the floor, it's the right time to address drainage permanently.

Permits are not typically required for replacing a basement floor in the same footprint, but if you're adding a sump pit, egress windows, or converting the basement to living space, permits apply. Always check with Saint John Building Inspection Services. New Brunswick Concrete can match you with basement floor specialists in the Saint John area — a free service with no obligation.