On June 28th the Bonney Lake-Sumner Courier Herald reported that all new residential construction in the city of Bonney Lake, WA will have to include a fire sprinkler system. According to the article, the city council passed the new ordinance by a vote of 6-1, with councilmember Mark Hamilton as the lone dissenting vote.
The article quotes councilmember Hamilton as saying that he was opposed; "because it would set the city of Bonney Lake apart from all other municipalities in the fire district, potentially making Bonney Lake less attractive to builders by adding the additional cost of sprinklers." This argument has been refuted by the NFPA study Comparative Analysis of Housing Cost and Supply Impacts of Sprinkler Ordinances at the Community Level. The study concluded that "the analysis...consistently indicated an absence of adverse impacts on housing supply and costs from the implementation of residential sprinkler requirements." In one of the communities studied, the opposite was true; there was an increase in building permits, when compared to the neighboring community without a mandate.
The State of Washington did not adopt the 2009 IRC, which included the home fire sprinkler requirement. However, the Washington Sprinkler Coalition http://nfpa.typepad.com/.a/6a00d8351b9f3453ef0133f2146033970b-pi(led by Captain Greg Rogers of South Kitsap Fire and Rescue and supported by NFPA) was able to convince the WA Building Code Council to allow local jurisdictions to adopt such requirements for all new homes without its approval; facilitating the ability of locals to require fire sprinklers in all new homes. The push to adopt at the local level is ongoing.