Pressure washing is one of the highest-impact, lowest-cost ways to refresh the exterior of an Ottawa home — restoring driveways, siding, decks, fences, and walkways to near-new appearance for a fraction of the cost of replacement. Ottawa's freeze-thaw climate and salt-heavy winters accumulate dirt, road salt, algae, and mildew on every exterior surface, making annual or biennial pressure washing a standard maintenance practice. This page covers what professional pressure washing services do, the soft-wash vs pressure-wash distinction (critical for siding and roofs), 2026 Ottawa pricing, season...
Driveways and walkways: most common pressure washing service in Ottawa. Concrete, asphalt, interlock pavers, and natural stone all benefit from annual cleaning to remove road salt, oil stains, leaf tannins, and algae. Cost typically $0.20-$0.45/sq ft. House siding: vinyl, aluminum, fibre cement, brick, and stone exteriors all benefit from cleaning. Soft-wash technique (not high-pressure) is required for vinyl and aluminum to avoid damage. Cost typically $0.25-$0.60/sq ft of wall area. Decks and ...
The critical distinction in professional exterior cleaning: pressure washing uses high water pressure (1,500-4,000 PSI) to physically blast dirt off durable surfaces (concrete, brick, stone, hardscape, treated wood). Soft washing uses low pressure (under 500 PSI) combined with biodegradable cleaning solutions (sodium hypochlorite, surfactants, algaecides) to chemically dissolve and rinse dirt and biological growth off delicate surfaces (vinyl siding, aluminum siding, stucco, painted surfaces, ro...
Per-square-foot rates: driveway/walkway $0.20-$0.45, siding (soft-wash) $0.25-$0.60, deck $0.45-$1.00, roof (soft-wash) $0.30-$0.60. Typical project pricing in Ottawa: standard 2-car driveway (500-700 sq ft): $150-$350. Full house siding (2,000-3,000 sq ft of wall): $500-$1,800. Deck cleaning + pre-stain prep (300-500 sq ft): $200-$500. Roof soft-wash (1,800-2,500 sq ft): $600-$1,500. Whole-property exterior cleaning bundle (driveway + sidewalk + house siding + back deck + fence): $800-$2,500 de...
Pressure washing season in Ottawa runs roughly mid-April through late October when overnight temperatures stay above freezing. Peak demand and best timing: late April-early May (post-winter restoration before deck season), late May-mid June (pre-summer entertainment season), late August-September (post-summer pre-fall reset, ideal for deck staining), mid-October (pre-winter cleanup, gutter cleaning bundle). Avoid: scheduling within 48 hours before forecast rain (rain re-wets and undoes work), wi...
DIY is reasonable for: driveway and walkway cleaning (rent or buy a 2,500-3,000 PSI gas-powered washer for $400-$900, full-day rental $80-$140), small deck cleaning, fence sections, patio furniture. Hire a professional for: vinyl/aluminum siding (soft-wash technique and chemicals matter), roof cleaning (height safety, fall protection, roofing warranty), large jobs over 2-3 hours (the time savings justify cost), gutter cleaning at height, and any work where you'd be on a ladder over 8 feet. DIY p...
Five verification points: (1) Liability insurance ($1M minimum, $2M preferred) — critical because pressure washing can damage siding, paint, landscaping, and adjacent property. (2) Knowledge of soft-wash vs pressure-wash by surface — ask which technique they'll use on your specific siding and roof. (3) Cleaning chemistry — for biological growth (mould, algae, mildew), the right chemical (sodium hypochlorite + surfactant for siding, oxalic acid for cedar deck brightening) matters as much as press...
Per-square-foot: driveway $0.20-$0.45, siding (soft-wash) $0.25-$0.60, deck $0.45-$1.00, roof (soft-wash) $0.30-$0.60. Typical projects: driveway $150-$350, full house siding $500-$1,800, deck + prep $200-$500, roof soft-wash $600-$1,500. Whole-property bundle: $800-$2,500.
Pressure washing uses high pressure (1,500-4,000 PSI) on durable surfaces like concrete and brick. Soft washing uses low pressure (under 500 PSI) plus biodegradable chemicals on delicate surfaces like vinyl siding, painted wood, and roofs. Using pressure on the wrong surface causes expensive damage including mould in walls.
Mid-April to late October when overnight temperatures stay above freezing. Peak timing: late April-early May (post-winter), late May-mid June (pre-summer), late August-September (deck restoration), mid-October (pre-winter cleanup). Avoid scheduling within 48 hours of rain or during high winds.
Yes, if done wrong. Excessive pressure can strip paint, force water behind vinyl siding (causing mould), gouge wood, etch concrete, damage mortar joints, void roofing warranties, and kill landscaping through chemical overspray. Hire a contractor who knows soft-wash vs pressure-wash by surface and carries $1M+ liability insurance.
Reasonable DIY job. Rent a 2,500-3,000 PSI gas-powered washer ($80-$140/day) or buy ($400-$900). Keep nozzle 12-18" from concrete surface to avoid etching. Pre-treat oil stains with degreaser. For full property cleaning including siding and roof, hire a professional with the right equipment and chemistry.