Callahan Construction General Contractor and Home Residential Remodeling, Home improvement Callahan Construction General Contractor works in Smithtown, Nesconset, Kings Park, Commack New York, Suffolk County, Nassau County, Long Island New York. Callahan Construction is a General Contractor. Callahan Construction Inc., locally does work in the greater Long Island area. Callahan Construction is a licensed contractor for all of your home remodeling and home improvement needs. In need of a Bathroom remodeling, a Kitchen update, a new patio, or a Dormer extension, contact Callahan Construction for all you Home Remodeling needs.