(Please note that in certain situations,  what ,  when , and  where  can function as relative pronouns.) Relative pronouns introduce relative clauses, which are a type of dependent clause. Relative clauses modify a word, phrase, or idea in the main clause.
The 2014 Survey of Construction (SOC) from the Census Bureau shows that the average completion time of a single-family house is around 7 months, which usually includes around 25 days from authorization to start and another 6 months to finish the construction.
The time it takes to build a custom home will vary based on size of the home, the quality of construction, and the amount of specialty features, and weather. 6. Construction will normally be completed in phases starting with prepping the lot and ending with painting and finishing touches.