(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.
4. How long will it take to build a deck? This varies a great deal by the complexity of the project including any mishaps and weather conditions but in general a 12 x 24 foot elevated deck with a staircase and railing should take a carpenter and laborer between one and three weeks to build. 5.ow long will it take to build a deck? This varies a great deal by the complexity of the project including any mishaps and weather conditions but in general a 12 x 24 foot elevated deck with a staircase and railing should take a carpenter and laborer between one and three weeks to build. 5.