Look for contractors with proper licensing, insurance, and industry certifications like CSIA (Chimney Safety Institute of America). These credentials indicate proper training and up-to-date knowledge of safety standards and best practices.Experience with local conditions matters too. Suffolk County’s climate presents specific challenges, so you want a contractor who understands how coastal weather, humidity, and temperature fluctuations affect chimney systems. Ask for references from recent local customers and check online reviews.Make sure any contractor provides written estimates, explains the work clearly, and offers warranties on their repairs. Avoid contractors who show up unsolicited or pressure you into immediate decisions. Quality chimney work requires proper assessment, planning, and skilled craftsmanship—not high-pressure sales tactics.