(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.
Costs less to build - Homes with slab foundations, on average, cost about $10,000 less to build. Faster to construct - Building a slab foundation is a simpler process than building a raised foundation, so it doesnât take as long. You can move into your new home sooner. Slab Cons. Difficult to access utilities - With a slab foundation, some