House & Siding Pressure Washing
Siding is where the "more pressure is better" instinct actually causes damage — vinyl panels can crack or blow out at close range under high PSI, and aggressive spraying can force water behind siding into wall cavities. The right approach is low-pressure "soft washing": a cleaning solution that kills algae and mildew at the root, applied at low pressure and rinsed clean.
Shaded, north-facing walls in older Kitchener and Waterloo neighbourhoods with mature tree cover are the most common problem spots — that greenish-black streaking is algae, and pressure alone won't remove it without the right solution first.
- Low-pressure soft wash — safe for vinyl, painted wood and stucco
- Algae- and mildew-killing solution, not just water
- Brick and stone soft washing available
- Windows and trim rinsed as part of the pass
What it costs in Kitchener
- Single-storey home: $250–$400
- Two-storey home: $350–$600
- Heavy algae/mildew (shaded, north-facing): may add $50–$100
- Stucco or brick (extra care required): priced individually on assessment
House & Siding Washing FAQs
Isn't 'soft washing' just a slower version of pressure washing?
No — it's a different method entirely. Low pressure alone won't kill algae at the root; the cleaning solution does the work, and the low-pressure rinse is just to clear it off without forcing water behind siding panels.
Will this damage my windows or trim?
No — windows and trim are rinsed as part of the standard pass at safe pressure, same as the siding itself.
How long does algae staining take to come back?
Typically 1–2 years depending on shade and moisture exposure. Sunnier, drier walls stay cleaner longer than shaded north-facing sides.
Can you also do the roof while you're here?
Roof soft washing is a related but separate service — see our roof and gutter cleaning partners for that; siding and roof use different solutions and techniques.