Fly ash is a residue obtained after burning pulverized coal during electricity production in thermal power plants. the main problem associated with this fine-grained waste material is its adequate disposal. if not disposed of properly, it causes contamination of the geoenvironmental ecosystem as well as several human health-related issues. in this endeavor, effort has been made to develop fly ash-based geopolymer bricks with dimensions of 230mm x 101mm x 75mm, cured under ambient conditions. these bricks are manufactured without incorporating any filler materials, i.e., only activating solution is added to fly ash. the activating solution used in brick production comprises a combination of sodium hydroxide (naoh) and sodium silicate (na₂sio₃). optimum mix proportions are determined on a laboratory/mortar cube scale (70mm x 70mm x 70mm) and then applied to manufacturing commercial/full-sized bricks in the laboratory. the ingredients are mixed in a pan mixer to ensure a lumps-free mix. the forming pressure for brick production is ranging between 14-17 mpa. sodium hydroxide solutions with molarities of 2m, 4m, and 6m were tested. these bricks are tested for mechanical and durability properties after 28 and 56 days of ambient curing. the results reveal that the bricks produced with 2m naoh and na₂sio₃, tested after 56 days of curing, met the requirements for class 10 bricks (compressive strength > 10 mpa and water absorption < 20%) of is 12894:2002. it is further noticed that the increment in naoh concentration in the activating solution from 2m to 4m and 6m enhanced the properties of bricks significantly. these geopolymer bricks demonstrate the potential to replace traditional burnt clay bricks. by promoting the extended use of fly ash, these bricks address the issue of fly ash accumulation and contribute towards sustainable development. the carbon footprints associated with these bricks are also negligible as no firing is involved in this process, unlike the traditional brick production method.