I don't understand how nobody here can compromise. Build quiet spaces into your office floorplan and eat the cost up front. If you can't afford to provide a place to work quietly for those that want it you can't afford space in that office building. Or you can't afford that number of employees. It's getting ridiculous, If you're going to keep saying it's expensive take the cost from somewhere else, like payroll. Provide a great workspace for your employees and in return you'll get great work. Poor planning upfront is going to cost you so much more on the back end.