This contractortalk.com thread focuses on sales closes and processes -- but I really enjoyed this observation by "Double-A", a renovation general contractor in Arkansas.
Ya know, sometimes folks just really do need some time to think about it.
Really. No, I'm not kidding. Granted that you haven't finished the sale if you walk away without a signature, and yes, you have possibly wasted some time, but, that is part of the job. Anyone with a 100% closure rate is selling ice cream for smiles to kids. Sometimes not overcoming their objection is exactly what you need to do in order to overcome their objection.