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© Copyright U.S. Green Building Council, Inc. All rights reserved.
Requirements
Prerequisites
None.Credits
Note: Certain surface water management strategies may be regulated, restricted, or even prohibited by local water authorities or code requirements.4.1 Permeable lot (maximum 4 points, as specified in Table 1). Design the lot such that at least 70% of the buildable land, not including area under roof, is permeable or designed to capture water runoff for infiltration on-site. Area that can be counted toward the minimum includes the following:- Vegetative landscape (e.g., grass, trees, shrubs).
- Permeable paving, installed by an experienced professional. Permeable paving must include porous above ground materials (e.g., open pavers, engineered products) and a 6-inch porous subbase, and the base layer must be designed to ensure proper drainage away from the home.
- Impermeable surfaces that are designed to direct all runoff toward an appropriate permanent infiltration feature (e.g., vegetated swale, on-site rain garden, or rainwater cistern).
OR
b) Plant one tree, four 5-gallon shrubs, or 50 square feet of native groundcover per 500 square feet of disturbed lot area (including area under roof ).4.3 Management of runoff from roof (maximum 2 points). Design and install one or more of the following runoff control measures:a) Install permanent stormwater controls (e.g., vegetated swales, on-site rain garden, dry well, or rainwater cistern) designed to manage runoff from the home (1 point).b) Install vegetated roof to cover 50% of the roof area (0.5 point).OR
c) Install vegetated roof to cover 100% of the roof area (1 point).d) Have the site designed by a licensed or certified landscape design or engineering professional such that all water runoff from the home is managed through an on-site design element (2 points).Table 1. Permeable Area
Percentage of buildable lot (excluding area under roof) that is permeable |
Points |
|---|---|
70–79% |
1 |
80–89% |
2 |
90–99% |
3 |
100% |
4 |
What does it cost?
Cost estimates for this credit
On each BD+C v4 credit, LEEDuser offers the wisdom of a team of architects, engineers, cost estimators, and LEED experts with hundreds of LEED projects between then. They analyzed the sustainable design strategies associated with each LEED credit, but also to assign actual costs to those strategies.
Our tab contains overall cost guidance, notes on what “soft costs” to expect, and a strategy-by-strategy breakdown of what to consider and what it might cost, in percentage premiums, actual costs, or both.
This information is also available in a full PDF download in The Cost of LEED v4 report.
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LEEDuser tip sheets, written by our team of LEED experts, fill gaps in knowledge we’ve observed between the LEED Reference Guide, LEED Online, and LEED Interpretations. We update them regularly so that our members get the most relevant guidance for current issues on their projects.
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© Copyright U.S. Green Building Council, Inc. All rights reserved.
Requirements
Prerequisites
None.Credits
Note: Certain surface water management strategies may be regulated, restricted, or even prohibited by local water authorities or code requirements.4.1 Permeable lot (maximum 4 points, as specified in Table 1). Design the lot such that at least 70% of the buildable land, not including area under roof, is permeable or designed to capture water runoff for infiltration on-site. Area that can be counted toward the minimum includes the following:- Vegetative landscape (e.g., grass, trees, shrubs).
- Permeable paving, installed by an experienced professional. Permeable paving must include porous above ground materials (e.g., open pavers, engineered products) and a 6-inch porous subbase, and the base layer must be designed to ensure proper drainage away from the home.
- Impermeable surfaces that are designed to direct all runoff toward an appropriate permanent infiltration feature (e.g., vegetated swale, on-site rain garden, or rainwater cistern).
OR
b) Plant one tree, four 5-gallon shrubs, or 50 square feet of native groundcover per 500 square feet of disturbed lot area (including area under roof ).4.3 Management of runoff from roof (maximum 2 points). Design and install one or more of the following runoff control measures:a) Install permanent stormwater controls (e.g., vegetated swales, on-site rain garden, dry well, or rainwater cistern) designed to manage runoff from the home (1 point).b) Install vegetated roof to cover 50% of the roof area (0.5 point).OR
c) Install vegetated roof to cover 100% of the roof area (1 point).d) Have the site designed by a licensed or certified landscape design or engineering professional such that all water runoff from the home is managed through an on-site design element (2 points).Table 1. Permeable Area
Percentage of buildable lot (excluding area under roof) that is permeable |
Points |
|---|---|
70–79% |
1 |
80–89% |
2 |
90–99% |
3 |
100% |
4 |
