Interstate Landscape Co., Inc. is a family owned business located in Londonderry, NH.

Owners Bill and Gail Gardocki started the business in 1981 while Bill was the horticulture teacher at Alvirne High School in Hudson, NH. In 1986 Bill left teaching to operate the business full time. A year later Gail left her position in the high tech industry to manage the office operations full time.

Bill Gardocki head shot-2013

Bill is an ICPI and NCMA nationally certified installer and instructor. In 2010, Bill became a certified Permeable Interlocking Concrete Paver installation instructor. He travels across the country during the winter months training other contractors on “best practices” techniques for the installation of brick paver and retaining wall products. He is a nationally recognized speaker in the Hardscape industry and also teaches the Landscape Construction class at the University of New Hampshire’s Thompson School. Bill is a monthly contributor to Hardscape Magazine. His articles focus on contractor issues in the hardscape industry.

CHP_4107Bill and Gail’s son, Tom, graduated in 2009 from the Thompson School of Applied Science at the University of New Hampshire with associate degrees in Construction Management and Business Management. Tom joined the company full time upon graduation, having worked the previous ten years as a part-time employee. Tom is an ICPI and PICP certified paver installer and an NCMA certified retaining wall installer. In the winter months, he teaches classes on how to use social media to promote business and close more potential sales. In 2012, Tom auditioned for and was selected to be on Discovery Channel’s “Machines of Glory”, a construction equipment operating competition show. The show aired December 30th, 2012, and his team won!

Bill, Gail, and Tom are committed to supporting the local community and maintain active involvement in many charitable organizations, as well as contributing services and knowledge to other community minded groups.


NH Landscape Association:
Past President
Winner of 3 Leon E. Pearson awards for Landscape Excellence

Derry Chamber of Commerce:
Past President
1996 Citizen of the Year

Derry Village Rotary Club:
1992 Rotarian of the Year

Londonderry Friends of Music:
Past President and Corporate Fundraising Chairman

Northeast Hardscape Expo:
Education Committee

Southern New Hampshire Home Builders Association