RCT study on Bricks to Blocks: Information and coordination challenges for transitioning to a cleaner building technology
RCTField Experiment
Context
Traditional fired clay bricks still dominate the construction sector in Bangladesh despite their environmental costs. Cleaner non-fired alternatives such as concrete blocks and soil blocks exist, but adoption remains low in both public and private construction. Earlier exploratory work pointed to information frictions, weak supplier visibility, and practical capacity constraints across contractors, procurement actors, and workers. This ongoing study tests whether reducing those frictions can shift material choice toward cleaner building technologies.Objective
The study evaluates whether reducing information frictions and capacity constraints can accelerate adoption of cleaner blocks. It is designed to measure how information workshops, supplier-directory access, and worker training affect block adoption and usage, procurement and tender behavior, block-related knowledge and perceptions, and worker-level skills and intentions.Methodology
The project uses a three-arm cluster randomized controlled trial across 66 upazilas in 22 districts, with a baseline sample of 3,056 respondents. Upazilas are randomized within district into: (i) a control group with no intervention; (ii) Treatment 1, which provides contractors, procurement officers, and private clients with in-person information workshops plus an information-and-facilitation package covering the policy context, comparative costs and benefits, a directory of local block suppliers, and basic workmanship guidance; and (iii) Treatment 2, which adds hands-on block-use training for one randomly selected worker per contractor. The within-contractor worker assignment in Treatment 2 also allows the study to estimate direct training effects and spillovers to untreated co-workers. Team: Dr. Munshi Sulaiman, Dr. Hashibul Hassan, Dr. Rohini Kamal, Tasfia Mehzabin, Md. Mohsin Hossain