The Brownstone Contractor Brooklyn in NY. Brownstone contractors brooklyn, Brownstone restoration brooklyn, Roofing contractors brooklyn, General contractor brooklyn and weatherproofing Brooklyn NYC.   Build with Excelon and Upgrade your Lifestyle Excelon Construction is a New York based locally known and family owned general construction company which has been serving residential and commercial clients since 2005. We specialize in a range of services that can take care of all of your construction and renovation needs. While our specialty is historic brownstone exterior restoration, we are also proficient in the following services: