Welcome to the Swing Senter, serving Massachusetts & Southern New Hampshire with Custom Built Sheds, Gazebos, Swing Sets, Forts & Lawn Items Since 1973. We are not just another lot we are your complete custom builder and service center. All of our Sheds & Gazebos have a 30 Year Limited Warranty. All of our Swing Sets Have a 15 Year Limited Warranty & a Full Year Warranty against defective parts. You won't find a better value anywhere.