How much does it cost to grind and resurface a pitted concrete garage floor in Saint John?

Grinding and resurfacing a pitted concrete garage floor in Saint John typically costs $4-$8 per square foot professionally installed, so expect $1,600-$3,200 for a standard two-car garage (400 square feet). The wide price range depends on the severity of pitting, the resurfacing method chosen, and whether you tackle some prep work yourself.

Professional grinding and resurfacing involves diamond grinding the existing surface to remove pitted areas and create a smooth profile, then applying a polymer-modified overlay or self-leveling compound. Most Saint John contractors charge $4-$6 per square foot for basic grinding and overlay, or $6-$8 per square foot for premium epoxy or polyaspartic systems that include decorative flakes and topcoats.

DIY grinding and patching can reduce costs to $2-$4 per square foot in materials, but requires renting a concrete grinder ($100-$150 per day in Saint John) and investing significant time in dust control and surface preparation. Small angle grinders work for minor pitting, but severely damaged floors need walk-behind grinders with dust collection systems.

New Brunswick's freeze-thaw cycles make garage floor pitting common, especially in Saint John where coastal salt air accelerates concrete deterioration. Road salt tracked in on vehicles creates additional freeze-thaw cycles at the surface, causing the characteristic scaling and pitting seen in Maritime garages. The pitting typically worsens each winter until addressed.

Resurfacing options include basic concrete overlay ($2-$3 per square foot in materials), epoxy coating systems ($4-$6 per square foot), or polyaspartic coatings ($6-$8 per square foot). Polyaspartic performs best in Saint John's humid conditions — it cures faster than epoxy and resists moisture better during the damp spring months when garage condensation is heaviest.

Additional costs include concrete cleaning and degreasing ($0.50-$1 per square foot), crack repair with polyurethane injection ($3-$8 per linear foot), and proper ventilation during application. Most Saint John contractors include basic cleaning in their quotes, but heavily oil-stained floors require additional degreasing steps.

Timing matters in Saint John — schedule resurfacing between May and September when humidity is lower and temperatures are stable. Epoxy and overlay systems need 48-72 hours of temperatures above 10°C for proper curing, and Saint John's coastal humidity can extend curing times in spring and fall.

Hire a professional for severely pitted floors — extensive grinding requires proper dust control (silica exposure regulations), and overlay systems have narrow application windows where temperature and humidity must be just right. A botched DIY overlay job means grinding it off and starting over, doubling your costs.

Need help finding a professional concrete contractor? New Brunswick Concrete can match you with Saint John area specialists experienced in garage floor restoration for a free estimate on your project.