The LEED for Homes Rating System (v4) includes the Water Efficiency (WE) Prerequisite: Total Water Use , which requires metering to monitor water consumption in LEED-certified homes, even those using well water.

According to the LEED Reference Guide for Homes Design and Construction (v4) :

WE Prerequisite: Total Water Use

Install water meters to measure total potable water use for the entire home, including indoor and outdoor uses. For multifamily or attached housing (e.g., semi-detached homes), each dwelling unit must have its own water meter to track individual usage accurately.

Source: LEED Reference Guide for Homes Design and Construction, v4, Water Efficiency Prerequisite: Total Water Use, p. 94.

The LEED v4.1 Residential BD+C rating system confirms:

WE Prerequisite: Total Water Use

In attached housing projects, such as semi-detached homes, each unit must have a separate water meter to monitor potable water use, regardless of whether the water source is municipal or well water.

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

For two semi-detached homes using well water, the builder must install two water meters for each unit separately (Option A) to comply with the prerequisite, ensuring individual monitoring of water use for each dwelling unit.

Why not the other options?

The LEED for Homes Rating System (v4) includes the Location and Transportation (LT) Credit: Community Resources and Services , which awards points for locating a project near essential community services to reduce transportation-related environmental impacts.

According to the LEED Reference Guide for Homes Design and Construction (v4) :

LT Credit: Community Resources and Services (1–2 points)

Locate the project within 1/4 mile (0.4 kilometers) walking distance of at least 4 community services (e.g., bank, supermarket, fire station, daycare, pharmacy, school, etc.) for 1 point, or 8 or more services for 2 points. The services must be publicly accessible and within the specified distance.

Source: LEED Reference Guide for Homes Design and Construction, v4, Location and Transportation Credit: Community Resources and Services, p. 56.

The LEED v4.1 Residential BD+C rating system confirms:

LT Credit: Community Resources and Services

Earn 1 point for proximity to at least 4 community services within 1/4 mile (0.4 km), or 2 points for 8 or more services, measured by walking distance.

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

The project is located within 1/4 mile (0.4 km) of six services: bank, supermarket, fire station, daycare center, pharmacy, and school. Since six services exceed the threshold of four but fall short of eight, the project earns 2 points (Option C).

Why not the other options?

A. Zero points : The project meets the criteria for at least 1 point (four services), so zero points is incorrect.

B. One point : This applies to exactly four services; six services qualify for 2 points.

The LEED for Homes Rating System (v4) addresses indoor water use in the Water Efficiency (WE) Credit: Indoor Water Use , which requires calculating the baseline water consumption to determine savings from efficient fixtures. For showers, key data points are needed to estimate usage.

According to the LEED Reference Guide for Homes Design and Construction (v4) :

WE Credit: Indoor Water Use (1–6 points)

Calculate baseline indoor water consumption using fixture flow rates (e.g., gallons per minute for showers), the number of bedrooms (as a proxy for occupancy), and the number of bathrooms to account for all fixtures. The baseline assumes standard flow rates and typical usage patterns based on occupancy and fixture counts.

Source: LEED Reference Guide for Homes Design and Construction, v4, Water Efficiency Credit: Indoor Water Use, p. 96.

The LEED v4.1 Residential BD+C rating system confirms:

WE Credit: Indoor Water Use

Indoor water baseline consumption is calculated using fixture flow rates, the number of bedrooms (to estimate occupants), and the number of bathrooms (to account for fixture distribution).

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

The correct answer is fixture flow rates, number of bedrooms, and bathrooms (Option A), as these are essential for calculating baseline shower water use based on flow rates and estimated occupancy.

Why not the other options?

The LEED for Homes Rating System (v4) encourages the use of native plants in the Sustainable Sites (SS) Credit: Site Development – Protect or Restore Habitat and Water Efficiency (WE) Credit: Outdoor Water Use to enhance environmental benefits, including support for local ecosystems.

According to the LEED Reference Guide for Homes Design and Construction (v4) :

SS Credit: Site Development – Protect or Restore Habitat (1–2 points)

Using native plants in place of conventional turf grass increases native wildlife habitat by providing food, shelter, and breeding areas for local species, supporting biodiversity.

Source: LEED Reference Guide for Homes Design and Construction, v4, Sustainable Sites Credit: Site Development – Protect or Restore Habitat, p. 74.

The LEED v4.1 Residential BD+C rating system confirms:

SS Credit: Site Development – Protect or Restore Habitat

Native plants enhance native wildlife habitat by creating ecosystems that support local fauna, unlike turf grass, which offers minimal ecological value.

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

The correct answer is native wildlife habitat (Option B), as native plants are adapted to local conditions and support indigenous species, unlike turf grass.

Why not the other options?

The LEED for Homes Rating System (v4) addresses rainwater harvesting in the Sustainable Sites (SS) Credit: Rainwater Management , which aims to reduce runoff and its environmental impacts, particularly in areas with significant rainfall events.

According to the LEED Reference Guide for Homes Design and Construction (v4) :

SS Credit: Rainwater Management (1–3 points)

Rainwater harvesting systems (e.g., rain barrels, cisterns) capture and store rainwater, reducing runoff volume and mitigating on-site erosion, especially during substantial rainfall spikes, by preventing excessive water flow across the site.

Source: LEED Reference Guide for Homes Design and Construction, v4, Sustainable Sites Credit: Rainwater Management, p. 76.

The LEED v4.1 Residential BD+C rating system confirms:

SS Credit: Rainwater Management

A key benefit of rainwater harvesting is mitigating on-site erosion by capturing runoff, particularly in areas with heavy rainfall, reducing soil displacement and environmental damage.

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

The correct answer is mitigates on-site erosion (Option A), as rainwater harvesting reduces runoff, preventing erosion during rainfall spikes.

Why not the other options?

The LEED for Homes Rating System (v4) awards points for the Materials and Resources (MR) Credit: Environmentally Preferable Products when materials, including insulation, meet sustainable criteria such as being reclaimed or salvaged. The credit calculates compliance based on the percentage of total material cost.

According to the LEED Reference Guide for Homes Design and Construction (v4) :

MR Credit: Environmentally Preferable Products (1–4 points)

Use products that meet one or more of the following criteria for at least 25% (1 point), 50% (2 points), or 90% (3–4 points) by cost of the total materials:

Reused or salvaged materials, such as reclaimed insulation. For specific material categories like insulation, at least 90% of the insulation (by cost) must be reclaimed, salvaged, or meet other environmentally preferable criteria to contribute significantly to the credit. Source: LEED Reference Guide for Homes Design and Construction, v4, Materials and Resources Credit: Environmentally Preferable Products, p. 160–161.

The LEED v4.1 Residential BD+C rating system confirms:

MR Credit: Environmentally Preferable Products

To earn points, insulation must meet environmentally preferable criteria (e.g., 90% reclaimed or salvaged by cost) to contribute to the overall material cost percentage (25%, 50%, or 90%).

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

For insulation to contribute to earning a point under this credit, a minimum of 90% (by cost) must be reclaimed or salvaged (Option C), aligning with the credit’s threshold for significant material contributions.

Why not the other options?

The LEED for Homes Rating System (v4) awards points for the Materials and Resources (MR) Credit: Environmentally Preferable Products when products are reclaimed (reused or salvaged from another project), contributing to the required percentage of material cost (e.g., 25% for 1 point).

According to the LEED Reference Guide for Homes Design and Construction (v4) :

MR Credit: Environmentally Preferable Products (1–4 points)

Use products that are reused or salvaged from the same or another project for at least 25% (by cost) of the total materials to earn 1 point. Reclaimed products include salvaged architectural elements like stained glass windows, which are reused in their original form.

Source: LEED Reference Guide for Homes Design and Construction, v4, Materials and Resources Credit: Environmentally Preferable Products, p. 160.

The LEED v4.1 Residential BD+C rating system confirms:

MR Credit: Environmentally Preferable Products

Reclaimed materials, such as salvaged stained glass windows, qualify for points if they contribute to the required material cost percentage (e.g., 25% for 1 point).

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

The correct answer is stained glass window (Option A), as it is a salvaged architectural element commonly reused in its original form, qualifying as a reclaimed material under the credit.

Why not the other options?

The LEED for Homes Rating System (v4) addresses fireplaces in the Indoor Environmental Quality (EQ) Credit: Enhanced Combustion Venting , which promotes safe combustion practices to prevent indoor air quality issues from fireplaces.

According to the LEED Reference Guide for Homes Design and Construction (v4) :

EQ Credit: Enhanced Combustion Venting (1 point)

For fireplaces, install doors and ensure they are direct-vented or power-vented to prevent combustion byproducts from entering the home. Unvented fireplaces or appliances are not permitted due to indoor air quality risks.

Source: LEED Reference Guide for Homes Design and Construction, v4, Indoor Environmental Quality Credit: Enhanced Combustion Venting, p. 144.

The LEED v4.1 Residential BD+C rating system confirms:

EQ Credit: Enhanced Combustion Venting

Fireplaces must have doors and be vented to the outdoors (e.g., direct-vent) to qualify for the credit, ensuring safe operation and minimal indoor air pollution.

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

The correct answer is install doors on the fireplace (Option A), as this, combined with proper venting (assumed in LEED-compliant fireplaces), ensures safe operation and compliance with the credit.

Why not the other options?

The LEED for Homes Rating System (v4) awards points for the Materials and Resources (MR) Credit: Environmentally Preferable Products when using certified lumber, specifically Forest Stewardship Council (FSC)-certified wood, which contributes to the required percentage of material cost.

According to the LEED Reference Guide for Homes Design and Construction (v4) :

MR Credit: Environmentally Preferable Products (1–4 points)

Use FSC-certified wood for at least 25% (1 point), 50% (2 points), or 90% (3–4 points) by cost of the total materials. For specific material categories like roof sheathing, at least 90% of the component (by cost) must be FSC-certified to significantly contribute to the credit.

Source: LEED Reference Guide for Homes Design and Construction, v4, Materials and Resources Credit: Environmentally Preferable Products, p. 160–161.

The LEED v4.1 Residential BD+C rating system confirms:

MR Credit: Environmentally Preferable Products

Points are awarded for FSC-certified lumber if it constitutes at least 90% of a specific component like roof sheathing (by cost) to meet higher point thresholds (e.g., 3–4 points). Certified lumber is not a prerequisite; it contributes to the credit.

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

The correct answer is if the certified content is greater than 90% (Option B), as this ensures the roof sheathing significantly contributes to the credit’s material cost threshold for points.

Why not the other options?

The LEED for Homes Rating System (v4) includes the Location and Transportation (LT) Credit: Community Resources and Services , which awards points based on the number of publicly accessible community services within 1/4 mile (0.4 km) for single-family homes or 1/2 mile (0.8 km) for multi-family projects. The question specifies a 1/2-mile radius, suggesting a multi-family context.

According to the LEED Reference Guide for Homes Design and Construction (v4) :

LT Credit: Community Resources and Services (1–2 points)

Earn 1 point for at least 4 community services or 2 points for 8 or more services within 1/2 mile (0.8 km) walking distance for multi-family projects. Qualifying services include restaurants, schools, pharmacies, grocery stores, and places of worship (e.g., churches), provided they are publicly accessible.

Source: LEED Reference Guide for Homes Design and Construction, v4, Location and Transportation Credit: Community Resources and Services, p. 56.

The LEED v4.1 Residential BD+C rating system confirms:

LT Credit: Community Resources and Services

Community services such as restaurants, schools, pharmacies, grocery stores, and churches within 1/2 mile (0.8 km) of a multi-family project count toward the credit if publicly accessible.

Source: LEED v4.1 Residential BD+C, Credit Library, accessed via USGBC LEED Online.

Evaluation of resources :

Three restaurants: All qualify as community services.

One school: Qualifies as a community service.

Two pharmacies: Both qualify as community services.

One church: Qualifies as a place of worship.

One grocery store: Qualifies as a community service.

Total : 3 + 1 + 2 + 1 + 1 = 7 resources .

The correct answer is seven resources (Option C), as all listed services are publicly accessible and within 1/2 mile, contributing to the credit.

Why not the other options?

A. Five resources : This undercounts the qualifying services (7 total).

B. Six resources : This also undercounts the total (7).