Re-building backyard & front porch-terrasse

We would like to have our backyard porch-terrasse rebuilt and expanded (10x6 m). On a slight slope. Please give us an estimate of cost involved (labor plus materials) and the time required to complete the job. We are also contemplating adding an extra piece to the overhead-extension outdoors. Estimate? Finally, we may also consider rebuilding the front porch as well (10x6 m). Estimate?