There are plenty of programs and books for estimating, but when you get right down to it there's only one Walker's -- an authoritative reference that shows you how to work up your own costs.

The estimating guides I've seen amount to little more than unit cost catalogs. With a cost data book, you wind up with someone else's estimate for someone else's job. This book is much more thorough. It's a "how-to" approach. You can do custom bids that cost out the job you are faced with, with real accuracy, and allow yourself flexibility and control.