i find its never wise to just say straight off "I need to come round and see the items before i can quote"
obviously thats best for you, but they dont know you from adam, you need to have a bit of friendly chat first, find out some things about them and let them know what you do, offer some free advice and if they do push for a price, i normally say its going to be between x and y but it will be more accurate and tailored to your needs if i pop by and have a quick look.
once you've made them feel a bit special and had a friendly chat, they will not want to lose that and start the process over again, its a bit of psychology but i find it works wonders for me, also if you make them feel there is no pressure at all and you are not desperate to get round there and quote them they feel alot more at ease.
I found this out a few years ago when i was working on my own and had work coming out of my earholes and didnt care as much about converting each call, my relaxed attitude actually worked the other way and made them want me to do the work over other people, i guess they could sense i wasnt that doing the hard sell and ive kept to that style ever since.
Anyhow it works well for me , but obviously in the back of your mind you do need to get round there have the tea & biscuits and work your magic
regards
steve