It maybe possible with newer sprinkler technology to retrofit buildings with less cost and less water damage when a sprinkler is activated. Water mist sprinklers are meeting code in the UK and the USA (NFPA section 750). One product is Smart Scan, check it out at www.plumis.com

I have no connection with this company or these products, just found it interesting that there are some new alternatives to the traditional sprinkler systems.