This is a good question, but difficult to answer. A second-story addition with similar features could subtract several weeks for excavation and masonry work, and several more weeks if a bathroom isn't included. A simple family room addition should take eight weeks under good conditions. Proper planning by the contractor is key to a kitchen project, figuring four to eight weeks for a complete interior gutting and installation of new cabinets and fixtures as well as new windows and a door. Toss in a skylight and wood flooring and the job should be substantially complete in 10 weeks, more or less.
Bathrooms are quicker, but once again, the key is having all materials on hand.
Expect two or three weeks for a complete gutting with new fixtures in the same locations, but no wall changes. But if walls are shifted, fixtures relocated, and custom tile work is involved, the time may expand to five or seven weeks. A simple basement without a bathroom should take six weeks. Remodeling contractors deal with so many variables and unforeseen circumstances that predicting an exact schedule is difficult, Benkowski said. It helps if all parties stay flexible and go with the flow.