Algae grows fast on Houston roofs because of the subtropical climate with hot humid summers and mild winters. I've seen it hit hardest on north-facing slopes in older Heights homes where poor attic ventilation traps moisture. Cheap crews often blast with high pressure and strip the granules right off asphalt shingles, which leads to leaks within a couple years. We stick to low-pressure sodium hypochlorite mixes that kill the algae at the root without tearing up the surface.
In neighborhoods like Montrose and River Oaks, many roofs from the 1980s and 1990s use laminated shingles that trap algae spores under the tabs. Once winter temperatures drop just enough, the growth spreads even more. Harris County does not require a permit for basic algae removal, but we still pull the right paperwork when the job ties into a bigger roof repair. Skipping the rinse step is the mistake I see most from fly-by-night outfits.
Space Center Houston and Minute Maid Park both sit under the same humid air that feeds roof algae. Homeowners near the Houston Zoo or Museum of Fine Arts call us when streaks start showing from the street. We treat the whole roof, not just the visible lines, so the problem does not come back in six months. One pass with the right mix and a follow-up inspection keeps the warranty solid.
Downtown high-rises and Midtown townhomes often need the commercial version because access is tight and safety lines are required. We schedule those on weekdays between 8am and 6pm or Saturday mornings until 2pm from our Katy Freeway shop.
Algae Roof Removal Services We Offer
✓Black Algae Removal on Asphalt Shingles
Soft wash treatment kills streaks on standard shingles in one visit and prevents regrowth for 12 to 18 months.
✓Emergency Algae Treatment for Leaking Roofs
Same-day soft wash plus temporary sealant on active leaks in Montrose or Heights homes before the next rain.
✓Tile Roof Algae Cleaning
Low-pressure wash on concrete or clay tiles around River Oaks without chipping edges or disturbing underlayment.
✓Commercial Roof Algae Removal
Scheduled daytime service on flat or low-slope commercial buildings in Downtown with lift access and runoff containment.
✓Algae Removal After Storm Damage
Post-storm inspection and targeted treatment on roofs near Minute Maid Park where wind-driven moisture sped up growth.
Algae Roof Removal Cost in Houston, TX
| Service | Typical Range | What Affects It |
|---|---|---|
| Algae Removal on Single Story Home | $400–$700 | Most common size in the Heights and Midtown; steeper pitches add cost. |
| Algae Removal on Two Story Home | $650–$1,100 | Extra time for ladders and safety lines in River Oaks and Montrose. |
| Tile Roof Algae Cleaning | $550–$950 | Slower application on fragile tiles; size and pitch move the total. |
| Commercial Roof Algae Removal | $900–$2,200 | Lift rental and containment for larger flat roofs in Downtown. |
| Free Estimate | Free | Call or text for a same-week visit from our 11767 Katy Fwy location. |
Ranges are typical for Houston, TX and confirmed with an exact written quote before any work starts.
How it works
- 1
Site Walk and Photos
We check every slope from the ground and attic, note square footage, and take pictures for your records. Takes 20 to 30 minutes.
- 2
Soft Wash Application
Apply the algae-killing mix to all surfaces and let it dwell. Covers the full roof in 45 to 90 minutes depending on size.
- 3
Rinse and Inspect
Low-pressure rinse removes dead algae and check for missed spots. Add 30 minutes for most single-story homes.
- 4
Final Walk and Advice
Walk the yard with you, point out any ventilation fixes needed, and schedule a free six-month check if growth returns.
Pricing
Prices vary by roof size, access, and how heavy the algae has grown.