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Residential Green Building
Residential green building requirements (one and two family dwelling requirements) apply to all new home construction (single-family attached and detached homes, townhomes, and duplexes not more than three stories or less) and additions/alterations to existing dwellings that meet the criteria for "new construction" as defined in Article VI of Chapter 5 of the Rockville City Code.

Requirements for building permit applications after July 1, 2015

1. Review and submit the Green Requirements Supplemental Form (version 2015) to determine what is required for your project.

2. Submit the green building checklist/scoring tool that demonstrates the project achieves a minimum Silver performance level is Chapters 5 through 10 of the ICC 700-2012 (National Green Building Standard) or equivalent system.  

The National Association of Home Builders (NAHB) and the International Code Council (ICC) developed the National Green Building Standard (NGBS) to define green building for single and multifamily homes, residential remodeling projects and site development projects. The Green Scoring Tool provides a checklist to score a home according to the NGBS requirements. Categories and threshold points for the Silver rating level are below:

Ch. 5: Lot Design, Preparation & Development (64)
Ch. 6: Resource Efficiency (59)
Ch. 7: Energy Efficiency (60)
Ch. 8: Water Efficiency (39)
Ch. 9: Indoor Environmental Quality (42)
Ch. 10: Operation, Maintenance & Building Owner Education (10)

  • Other equivalent green homes checklist (as approved by the City)

The City is willing to consider alternative methods of compliance such as other rating systems or building codes so long as they are deemed equivalent in spirit and stringency to the rating system, code or program referenced. The applicant must work with the City to demonstrate equivalency and develop acceptable compliance documentation.

3. Building plans and specifications must demonstrate compliance with all mandatory provisions and the threshold number of points in Chapters 5 through 10 for the Silver performance level, in accordance with Table 303 of the NGBS.

4. Demonstrate that certain building components (windows, ceiling fans, ventilation fans and programmable thermostats) meet or exceed the U.S. EPA's ENERGY STAR requirements.

5. Builders must provide the homeowner/ occupant with a manual describing the intent, benefits, use and maintenance of green building features.


Requirements for building permit applications prior to July 1, 2015

1. Review and submit the Green Requirements Supplemental Form (version 2012) to determine what is required for your project. 

2. Submit a green building checklist* (select one of the following) 

The U.S. Green Building Council developed the LEED for Homes voluntary rating system to promote the design and construction of high-performance green homes, including affordable housing, mass-production homes, custom designs, stand-alone single-family homes, duplexes and townhouses, suburban and urban apartments and condominiums and lots in historic buildings

  • The National Association of Home Builders (NAHB) and the International Code Council (ICC) developed the National Green Building Standard (NGBS) to define green building for single and multifamily homes, residential remodeling projects and site development projects. The Green Scoring Tool for new construction provides a checklist to score a home according to the NGBS requirements. 

  • Other LEED equivalent residential rating system checklist (as approved by the City)

The City is willing to consider alternative methods of compliance such as other rating systems or building codes so long as they are deemed equivalent in spirit and stringency to the rating system, code or program referenced. The applicant must work with the City to demonstrate equivalency and develop acceptable compliance documentation.

3. Demonstrate that certain building components (windows, ceiling fans, ventilation fans and programmable thermostats) meet or exceed the U.S. EPA's ENERGY STAR requirements. 

4. Meet the energy efficient homes criteria, including meeting the envelope, windows, and lighting specifications of the ENERGY STAR qualified homes criteria, or qualify via the National Performance Path by achieving a HERS Index of 85 or lower. 

5. Meet the specifications for the ENERGY STAR Indoor Air package for protection from mold, chemicals, combustion gases and other airborne pollutants. 

6. Builders must provide the homeowner/ occupant with a manual describing the intent, benefits, use and maintenance of green building features. 

*Note: The 2012 residential requirements call for "checklist only", meaning that a project team member (typically the architect, but could be the contractor, owner or engineer), must download the applicable rating system checklist (LEED or NGBS) and check off items they are incorporating or willing to consider incorporating into their project. The "checklist only" requirement is used as an educational tool for increasing green building awareness. Implementation of checked items is not required (excluding items required by the building code).