You need a full time guy with some skills you can meet on the job and he already has stuff out and set up, or leave him at 2pm to cut, sweep, clean up and grade etc. this kind of work cannot be done alone at any real scale. Next, i will talk to people for a few mins on the phone. They want a walkway? Great i would love to come look at it. Its about 20x4? Awesome thats around $2k in concrete. Answer A You want brick and have $1500? Sorry call me in the future have a great day. Answer B that fits in your budget? When are you available to meet up and take a look at it. A walkway you should be able to price out on the spot barring they want some exotic material. If is a patio, walk, stoop, grading, planting and you need some time, tell them theyre looking at12-17k does that work? At this point they decided they like me and they have that kind of money, give me a deposit and i will design it. Never spend 8 hrs on a job you dont have or won't most likely get and certainly not on EVERY SINGLE ESTIMATE. I dont claim to have it all figured out, many here will tell you i dont myself included. Im out at 6 am and home at 8pm after working all day and doing estimates but this year has been great and im getting more nice jobs with less work and hours wasted.