However, over its lifetime, the green roof would save about $200,000. Depending on design, plant type, and climate conditions the price of green roof construction typically ranges from $15-20 per square foot, though the EPA projects that extensive green roof installation costs should drop to $8-$15/sq. The net effect reduces the temperature of the r oof … Nearly two-thirds of these savings would come from reduced energy needs for the building with the green roof… EPA Staff of Environmental Protection Agency writes: Green roofs can contribute to environmental and livability goals—to mitigate the urban heat island effect, maintain clean air and water, and lower energy costs in buildings—while greening the urban landscape. Green roof vegetation can shade buildings and increase evapotranspiration, which shifts a roof’s energy balance (or “budget”). Costs for Green Infrastructure and Stormwater Controls Bob Newport U.S. EPA Region 5 (Chicago Office) August 5, 2015. Detailed cost variables for green roofs 7. Business Privilege Tax – Green Roof Tax Credit: The city offers a credit against the Business Privilege Tax of 25% of all costs incurred to construct a green roof up to $100,000. A green roof system atop a building helps manage stormwater and reduce energy costs for cooling. 5. The green roof would cost $464,000 to install versus $335,000 for a conventional roof in 2006 dollars. The initial cost of a green roof can be 30 percent greater than a conventional roof, but the long-term savings on maintenance and energy costs can offset the initial cost by increasing the roof’s lifespan by 50 percent. To qualify, the green roof must cover 50% of the building's rooftop or 75% of 'Eligible Roof Top Space', defined as the total space available to support a Green Roof. Costs of a green roof tray system range from $10 to $30 per square foot. Green roofs are covered with growing media and vegetation that enable rainfall infiltration and evapotranspiration of stored water. Topics to be Covered EPA data collection and cost analysis focused on post-construction stormwater BMPs - Methods - Some results ... Green Roof Detention Basin. 2. A large body of evidence shows that green roofs help to reduce local ambient air and surface temperatures in cities. Green Roof Economics Benefits-----Costs NPV = Net Present Value Benefits Costs Rinaldi, Buffam et al. Maintenance issues which ensure longevity of the green roof 6. Labor makes up a significant portion of the cost of a green roof, mostly because the process of creating one can be labor-intensive. EPA building costs zProjected cost for detention w/o green roof = 34,000s.f. ; Primary green roof costs are related to installation and maintenance. foot as installations increase, and soil substrate and plants became more available (EPA, 2009). GSA’s green roof report estimated that green roofs on commercial and public buildings provide a payback, based on 50 year average annual savings, of about 6.2 years nationally, internal rate of return of 5.2%, and an ROI of 224%, based on a net present value of $2.7/square foot. Labor Costs to Install a Green Roof . 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