An average residential roof in Calgary is approximately 1,800–2,000 sq ft (about 170–185 m²).

Calgary receives roughly 320–420 mm of usable rainfall per year (mainly from April to October). Using the standard rainwater harvesting formula:

• Theoretical collection: Roof area (m²) × rainfall (mm) = litres of water

• For a typical 180 m² roof with 350 mm average rainfall → about 63,000 litres (63 m³) per year.

In practice, you can realistically capture 70–80% of that amount after accounting for losses from roof wetting, evaporation, first-flush diversion, and system efficiency. This usually works out to 45,000 – 55,000 litres of usable rainwater annually from an average-sized roof.

This is often enough to cover a significant portion of garden irrigation, lawn watering, or even some household non-potable needs during Calgary’s drier summer months.

For a more accurate estimate based on your specific roof size, we offer free site assessments and custom system designs.

Costs for a custom rainwater harvesting system in Calgary vary depending on the size, type, and complexity:

• Simple rain barrel systems: $150 – $400 (after Calgary’s $50 rain barrel rebate where applicable) — great for small gardens.

• Above-ground cistern systems (500–2,000+ litres): $2,000 – $8,000 installed.

• Larger or underground cistern systems (with pumps, filtration, and irrigation integration): $8,000 – $15,000+.

According to City of Calgary guidelines, a typical comprehensive residential system usually falls in the $6,000 – $14,000 range.

Every property is different — roof size, desired storage volume, gravity vs. pumped systems, and integration with your garden or irrigation all affect the final price.

We offer free consultations and custom quotes tailored to your home and goals. Contact us with your roof details or photos, and we’ll provide a clear, no-obligation estimate.

We combine strong technical expertise with a genuine commitment to doing things right the first time. With a 4-year Bachelor’s degree in Horticulture and over 6 years of professional experience in horticulture and biotech, we bring science-based knowledge that most general landscapers simply don’t have.

Our focus is on creating timeless, functional, and low-maintenance outdoor spaces rather than quick, temporary fixes. We integrate smart solutions like custom rainwater harvesting, sustainable plant selection, and efficient hardscaping that work together for long-term success.

You’ll notice the difference in:

• Thoughtful, personalized recommendations instead of one-size-fits-all approaches

• Higher attention to detail and quality workmanship

• Honest advice grounded in both horticultural science and practical Calgary conditions

We treat every property like our own and stand behind our work with pride.

You can reach us anytime via our contact page or email. We aim to respond quickly—usually within one business day.

tom@ecoedgesls.com

587-202-0457

Collaborative, honest, and straightforward. We're here to guide the process, bring ideas to the table, and keep things moving.