Ancillary construction materials are new age research focused construction materials. The study is aimed to develop and analyze Eco Epo-seal, ancillary construction material. Raw materials of Eco Epo-seal are discarded mine waste (DMW), porous fine aggregate like (PFAL) from thermal power plants, and iron and steel waste (ISW) for addressing environmental concerns associated with waste disposal. Epoxy resin is used as a binder to enhance the mechanical and durability properties of the material. A 36 different compositions of Eco Epo-seal are obtained by varying epoxy (10–30%), DMW (7–27%), PFAL (37–81%) and ISW (0–12%). Water absorption and compressive strength of Eco Epo-seal are analyzed for long term condition ranging from 0.23–46.66% and 2.36–30.2 MPa respectively. The research employs modelling using multiple linear regression and principal component analysis to establish quantitative relationships between the material composition and its performance characteristics. The findings indicate that higher epoxy content significantly improves the material's resistance to water absorption and compressive strength, making it suitable for high-load applications and extreme conditions. The study concludes that Eco Epo-seal, sustainable composition and enhanced performance, can contribute to the development of eco-friendly construction practices and support the transition towards a more sustainable built environment.