THE CONSTRUCTION INDUSTRY AND THE PRODUCTION OF INPUTS IN THIS SECTOR ARE THE ACTIVITIES THAT SHOW THE HIGHEST RATES OF CONSUMPTION OF MATERIALS AND RAW MATERIALS WORLDWIDE. THIS RESEARCH PROPOSES A METHODOLOGY THAT INCORPORATES THE ESTIMATION AND COST ASSOCIATED WITH THE WASTE GENERATED IN CONSTRUCTION, INCORPORATING THE ?LOSS FACTOR? TO THE UNIT COST ANALYSIS (UCA) THAT IS ASSOCIATED WITH THE COST OF LOSS OF A PARTICULAR MATERIAL. IN ADDITION, IT IS PROPOSED TO INCORPORATE THE TYPIFICATION OF THE ?ÁBACO-CHILE? OF THE WASTE GENERATED BY EACH MATERIAL DEFINED IN THE UCA. ON THE OTHER HAND, A SURVEY IS CARRIED OUT AMONG 71 CONSTRUCTION PROFESSIONALS, FOR THEM TO ESTIMATE, ACCORDING TO THEIR EXPERIENCE AND CRITERIA, THE LOSS FACTOR (%) ASSOCIATED WITH THE COST OF THE MOST INCIDENT MATERIALS IN THE GENERATION OF WASTE IN THE CONSTRUCTION. BASED ON THE RESULTS OF THE SURVEY, THE PROBABILISTIC DISTRIBUTION THAT BEST FITS THE MATERIALS IS DETERMINED, THROUGH THE CRYSTAL BALL SOFTWARE, DETERMINING THE MOST PROBABLE LOSS FACTOR (%), WHICH WOULD BE THE MOST RECOMMENDED IN CASE OF NOT KNOWING HOW TO ESTIMATE THE LOSS FACTOR. PROPER WASTE TYPIFICATION AND RELIABLE ESTIMATION OF THE COST OF CONSTRUCTION WASTE BEFORE THE COMMENCEMENT OF CONSTRUCTION ACTIVITIES WILL HELP DECISION-MAKERS TO BETTER UNDERSTAND THE COST IMPLICATION OF WASTE GENERATION AND IMPROVE THEIR DECISION-MAKING IN DEVELOPING THE APPROPRIATE STRATEGY THAT CAN MITIGATE CONSTRUCTION WASTE GENERATION.