Build It Pros Estimator Professionally Scoped Estimates for small & independent Trades operators. Replace wood 10' x 20' decking with composite. Preferably Trex in Saddle color. Deck has two stairs at each end 5' wide with 4 steps. Existing railing and pickets to be retained. How long would it take you to write even a half-baked estimate based on this? Build It Pros Estimator produces a scoped, 17-line estimate complete with materials and labor priced for NE AZ counties - in 30 seconds.