The common practice is to not speak from the beginning of bedikas chameitz (from after the bracha) until the conclusion of the search, ostensibly to avoid a hefsek in the mitzvah performance. The Rosh (siman 10) asks why this should be so. When we fulfill the mitzvah of sukkah, says the Rosh, we say the bracha and begin our seudah, but no one would suggest there is an issur of speaking until one leaves the sukkah. If so, why is bedikas chameitz different?
How would you answer the kashe of the Rosh?