Roof soft washing in Chilliwack starts at $850 plus GST and goes up from there based on roof size, pitch and how much moss has taken hold. Here's how to estimate your number before you pick up the phone.
Roof soft washing starts at
$850
+ GST, and up by roof size
That $850 floor covers a straightforward roof: moderate moss and algae, reasonable pitch, clear access, one simple roofline. Most Chilliwack homes land somewhere between $850 and $1,600. Larger, steeper, or heavily-mossed roofs run above that.
Why not a flat rate? Because two roofs of the same square footage can take wildly different amounts of time. A 1,500 sq ft bungalow with a 4/12 pitch and two valleys might take three hours. A 1,500 sq ft two-storey with a 9/12 pitch, four dormers and a wraparound — same footprint, but it's a six-hour job with significantly more fall-protection rigging.
Roof area
The clearest driver. More square footage means more treatment, more rinse, more time. Roof area is always larger than your home's floor area once you account for pitch and overhangs.
Pitch and height
Steep roofs need more safety setup and slower, more careful movement. Two storeys means more ladder and more rigging. A walkable 4/12 is a different job from a 10/12 you can't stand on.
Moss severity
Light green algae film comes off quickly. Thick moss with root systems lifting shingle edges takes repeat applications to fully kill. Heavy moss is the most common reason a quote lands above the starting price.
Complexity
Valleys, hips, dormers, skylights, chimneys, multiple gables — every one adds time and detail work.
Access and landscaping
Tight side yards, fences, delicate plantings below, or nowhere to safely set a ladder all add setup time. Awning gutters and awning glass are extra.
A proper soft wash is not just spraying a chemical on the roof. Our process includes:
Why low pressure matters
Pressure washing a shingle roof strips the protective granules and voids most manufacturer warranties. Soft washing uses roughly the pressure of a garden hose with a cleaning solution doing the work. We wrote a technical comparison here.
| Option | Cost |
|---|---|
| Soft wash (extends life 2–3 years) | $850–$1,600 + GST |
| Soft wash + GoNano rejuvenation (extends 10–15 years) | $3,000–$7,000 + GST |
| Full roof replacement | $15,000–$25,000 |
If your shingles are structurally sound — not curling, not brittle, granules still intact — cleaning is almost always the right first move. It buys you years and lets you plan a replacement on your schedule rather than an emergency one.
We wrote a full decision guide on repair vs. replace that walks through the warning signs.
Save $100 — pair it with gutter cleaning
This is the obvious pairing and most customers do it. When moss and debris come off the roof, a chunk of it ends up in the gutters. If you're paying for soft washing, you want clean gutters on the other end of it.
Gutter cleaning from $275Save $250 — add GoNano protection
Soft wash then treat in the same visit. A clean roof bonds better with the nanotechnology treatment, which is why we discount it. Turns a 2–3 year cleaning cycle into a 10–15 year protection cycle.
See GoNano pricingThe single most expensive thing you can do to a mossy roof is ignore it. Moss root systems lift shingle edges, letting water underneath. Once that starts, you're not cleaning — you're repairing, and repairing quickly becomes replacing.
A soft wash every two to three years keeps the cycle cheap. Waiting five years turns an $850 job into a $20,000 one.
Warning signs you're overdue
We'll tell you honestly whether you need cleaning, protection, or a replacement. Fixed written quote, no obligation.