Quick answer
Professional roof cleaning in Halifax, NS typically costs $279–$999 in 2026, tiered by roof size, with most two-storey roofs landing around $450–$699. That price covers standard algae and black-streak (gloeocapsa magma) treatment. If your roof has heavy moss that needs manual removal first, budget an extra $150–$350 on top.
If those dark streaks or patchy green growth on your roof have you searching "how much does roof cleaning cost," here's exactly what to budget for in Halifax in 2026 — and why moss and algae aren't priced the same.
Average Roof Cleaning Cost in Halifax, NS (2026)
Pricing scales with roof size. Here's what that looks like for common Halifax roofs:
| Roof Size | Typical Cost |
|---|---|
| Small roof (up to 1,500 sq ft) | $279–$449 |
| Medium roof (1,500–2,500 sq ft) | $450–$699 |
| Large roof (2,500–3,500 sq ft) | $700–$999 |
| Extra-large or complex roof (3,500+ sq ft) | $1,000+, custom quote |
Most Halifax two-storey roofs land around $450–$699. Where you fall within your size bracket depends on how much algae or moss has built up and how steep or complex the roofline is — multiple valleys, dormers, and gables all add time on the roof.
Algae vs. Moss: Why the Treatment (and Price) Is Different
Those dark streaks running down most Halifax roofs aren't dirt or age — they're a living cyanobacteria called gloeocapsa magma, feeding on the limestone filler in asphalt shingles. Halifax's humidity, salt air, and freeze-thaw cycles make the HRM close to a perfect growing environment for it, which is why it shows up here more than in most other parts of the country. Standard soft washing kills it at the root with a low-pressure application, and it rinses away naturally over the following weeks. This is what the price ranges above cover.
Heavy moss adds $150–$350 to the base price
Moss is a different problem than algae streaking. It grows in raised clumps, especially on shaded or north-facing roof sections, and has to be manually removed by hand before any treatment can work — scraping it off is slow, careful work since it can't be forced or it risks lifting shingle granules with it. If your roof has patchy green or grey moss buildup rather than just dark streaking, expect an extra $150–$350 on top of the base price depending on how much of the roof is affected.
What Affects the Cost of Roof Cleaning?
- Roof size. More square footage means more time on the roof — the biggest factor in price.
- Algae vs. moss. Algae and black streaking are treated with standard soft washing. Moss requires manual removal first, which adds cost.
- Roof pitch and complexity. Steep pitches need more safety equipment, and multiple valleys, dormers, or gables extend labour time.
- Roofing material. Asphalt, architectural, and cedar shingles each call for slightly different treatment strength and dwell time.
- Tree cover and shade. Shaded, north-facing roofs and homes under mature trees tend to have heavier growth and need cleaning more often.
What's Included in a Professional Roof Cleaning
At WashCrafters, every roof cleaning uses a low-pressure application — never a pressure washer directly on shingles, which is what causes granule loss and voided manufacturer warranties. We treat moss, lichen, and black algae streaks, check your gutters while we're up there, and pre-rinse and protect landscaping below the roofline before we start. It's safe for asphalt, architectural, and cedar shingle roofs.
Roof Soft Washing vs. Pressure Washing
Soft washing uses a low-pressure application of cleaning solution that kills algae, moss, and lichen at the root, so it rinses away naturally over the following weeks instead of being blasted off. Pressure washing forces growth off the surface immediately, but that same force strips the protective granules off asphalt shingles and can crack or dislodge tile and cedar shakes. Soft washing is the industry-recommended method for residential roofs, and it's the only method we use on shingles.
Is Roof Cleaning Worth the Cost?
Yes — it's about more than curb appeal. Algae and moss hold moisture against your shingles, which speeds up granule loss and quietly shortens your roof's functional lifespan. A roof replacement runs into the thousands, while a cleaning every 2–3 years is one of the cheapest ways to delay that conversation and protect the investment you already made in your roof.
We're a locally owned, fully insured crew based in Bedford, NS, and roof cleaning across the Halifax Regional Municipality is something we do year-round. If you want an exact number for your roof rather than a general range, get a free quote and we'll give you a firm price — including whether moss removal applies — before any work starts.
Frequently Asked Questions
How much does roof cleaning cost in Halifax?
Professional roof cleaning in Halifax typically costs $279–$999, tiered by roof size: $279–$449 for a small roof up to 1,500 sq ft, $450–$699 for a medium roof (1,500–2,500 sq ft), and $700–$999 for a large roof (2,500–3,500 sq ft). Extra-large or complex rooflines over 3,500 sq ft start around $1,000 with a custom quote. Most Halifax two-storey roofs land around $450–$699.
Is moss removal priced differently than algae or black streak treatment?
Yes. The price ranges above cover standard soft wash treatment for algae and black streaking (gloeocapsa magma), which is what most Halifax roofs need. If a roof has heavy moss that requires manual removal before treatment, that adds $150–$350 depending on how much of the roof is affected.
How often should I get my roof cleaned in Halifax?
Every 2–3 years is typical in the HRM given our humid, salty climate. Shaded or north-facing roofs, and roofs under heavy tree cover, often need it closer to every 2 years to stay ahead of algae and moss regrowth.
Is roof cleaning safe for my shingles?
Yes, when it's done correctly. We use low-pressure soft washing, never a pressure washer directly on shingles — pressure washing a roof strips the protective granules and can void your shingle manufacturer's warranty.
What's the difference between roof soft washing and pressure washing?
Soft washing uses a low-pressure application of cleaning solution that kills algae, moss, and lichen at the root so it rinses away naturally over the following weeks. Pressure washing blasts growth off the surface with force, which strips protective granules from asphalt shingles and can crack or dislodge tiles. Soft washing is the industry-recommended method for asphalt, architectural, and cedar shingle roofs.
Kendall Scott
Owner/Operator, WashCrafters Exterior Home Solutions Inc. — Bedford, NS. Fully insured, 5.0 stars on Google, and a soft-wash specialist across the HRM.