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Stanek Windows Certifications & Associations

As an organization, we are dedicated to quality and are proud of our commitment to excellence in everything we do. We are happy to be associated with the following leading industry organizations.


The National Fenestration Rating Council (NFRC) is a non-profit public/private organization created by the window, door and skylight industry. It established a voluntary national energy performance rating and labeling system for fenestration products. The National Fenestration Rating Council consists of architects, manufacturers, suppliers, builders, designers, utilities and government agencies.

The goal of NFRC is to provide accurate information to measure and compare the energy performance of window, door or skylight products. The NFRC rates the following: U-factor, solar heat gain, visible light transmittance and air leakage.


ENERGY STAR was introduced in 1992 by the US Environmental Protection Agency (EPA) and is a voluntary labeling program to identify and promote energy-efficient products in order to reduce carbon dioxide emissions. In 1996, the EPA and the US Department of Energy partnered together to expand their coverage to new homes, residential heating and cooling equipment, major appliances, office equipment, lighting and consumer electronics.

If all consumers made their choice to purchase ENERGY STAR-labeled products, they would make a sizable contribution in reducing air pollution and protect the earth's climate for future generations. They would also help reduce the national annual energy bill by about $200 billion over the next decade. Remember, money is not the only thing you, the consumer, will be saving.


NAMI provides Certification Inspection and Quality Assurance Services to the Building Industry. The agency specializes in fenestration and building envelope products which include windows, patio doors, skylights, entrance doors, sidelites, transoms, glazing wall systems, site-built and insulating glass products. NAMI is a licensed inspection agency for the NFRC Program. For more information, visit NAMI.


As of April 22, 2010, federal law requires that contractors and/or firms performing renovation, repair, and painting projects that disturb lead-based paint in homes, child care facilities, and pre-schools built before 1978 must be certified by EPA and that they use certified renovators who are trained by EPA-approved training providers to follow specific lead-safe work practices to prevent lead contamination.

  • Renovation firms must be certified under EPA's Renovation, Repair and Painting Rule
  • Individuals must be trained in lead-safe work practices
  • Training providers must be accredited by EPA

 Find out more about EPA's Lead-Safe Certified Program required by EPA's Lead Renovation, Repair and Painting Rule.

Inc. 5000 2021INC. 5000

Inc., founded in 1979 and based in NYC, is one of the leading American business magazines with over a million annual subscribers and best known for its annual rankings of the fastest-growing privately held companies in the United States, the Inc. 500 and Inc. 5000.

Great Day Improvements, makers of Stanek® brand windows and doors, was once again named to the Inc. 5000 ranks for 2022!

Qualified Remodeler’s Top 500QUALIFIED REMODELER’S TOP 500

For almost 40 years Qualified Remodeler® Magazine has been publishing the Top 500 List, the remodeling industry’s most prestigious ranking. Companies are selected based on a rigorous analysis by the Qualified Remodeler editorial staff and must meet a set of criteria including installed remodeling dollar volume, total years in the remodeling business, industry association memebership, industry certification, industry awards and community service. It is the only third-party verified analysis of the financial performance of the remodeling industry.

Great Day Improvements, manufacturers of Stanek® brand windows and doors, currently ranks #4.

Big50 REMODELING Magazine Big50

REMODELING magazine has selected Great Day Improvements, LLC to be inducted to it's Big50. Each year since 1986, the REMODELING Big50 inducts 50 remodeling companies that have set exceptionally high standards for professionalism and integrity through exemplary business practices, craftsmanship, and impact in their community or the industry at large.

Remodeling Magazine's 55 ListREMODELING Magazine's 550 List

REMODELING magazine publishes an annual list of top full-service and replacement/specialty firms based on total jobs completed as well as revenue.

Great Day Improvements, manufacturers of Stanek® brand windows and doors, currently ranks #10.


InstallationMasters™, prompted by the Building Environment and Thermal Envelope Council (BETEC) through the U.S. Department of Energy (DOE) and development by the American Architectural Manufacturers Association (AAMA), is a nationwide training and certifications program for new construction and replacement installers of windows and exterior glass doors in residential and light commercial markets. The InstallationMasters Training and Certification Program is an important and exciting tool being offered to installers of windows and doors all across the country.

The program is specifically designed to help installers:

  • Avoid costly callbacks
  • Improve energy efficiency
  • Work more efficiently, optimizing both time and energy
  • Maximize product benefits for happier, more satisfied customers

 For more information, visit InstallationMasters.

National Association of the Remodeling Industry (NARI)NATIONAL ASSOCIATION OF THE REMODELING INDUSTRY (NARI®)

Great Day Improvements is a proud member of the National Association of the Remodeling Industry (NARI). NARI is an association of contractors, design-building firms, manufacturers, suppliers, distributors, subcontractors and lenders who are committed to educating both trade professionals and homeowners.

The NARI Certification Program provides the remodeling industry with a formalized standard of expertise, knowledge and ethical conduct. This certification program identifies remodelers who have undergone a detailed review and testing in areas of business management, ethical conduct and technical skills.

"The National Association of the Remodeling Industry is dedicated to being the best resource for knowledge and training in the remodeling industry. Together we help construct the dreams in people's lives."

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