(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.
How Long Does it Take to Build a Custom Home Variables. The exact amount of time it takes to build a custom home depends on the size of the home, the quality of construction, and the amount of specialty features, such as stone work, and custom carpentry. The size of the construction or home building company you employ can also impact the amount of time required.