Plastic bottles are major issue of solid waste disposal. Several things which were invented for our convenient life are responsible for polluting environment due to improper waste management technique. One of them is a plastic which has to be disposed or recycled properly to maintain the beauty of our nature. Polyethylene Terephthalate (PET, PETE or polyester) are routinely used for carbonated beverage and water bottles. This is an environmental issue as waste plastic bottles are difficult to biodegrade and involves processes either to recycle or reuse. In the Modern world, the construction industry is searching for cost-effective materials for enhancing the strength of concrete structures. This work is carried out with the possibility of using the waste PET bottles as the partial replacement of aggregate in Portland cement. Concrete with 1%, 2%, 2.5%, 3% and 5% PET bottle fibers for fine aggregate were produced and compared against control mix with no replacement. Cube specimens, cylinder specimens and prism specimens were cast, cured and tested for 7 day and 28 days strength. Tests such as Compression test, splitting tensile test and flexural strength tests were done and the results were compared with control specimens and results were compared. The observed results revealed an increase in compression and tensile strength hence with the increasing demand for fine aggregate, PET bottle fiber replacements can be adopted. This study was carried to investigate the properties of concrete with plastic pet (bottle) fibres as partial replacement of fine aggregates.