(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.
Build Your Own House - Cost Estimating. Summary: How much does it cost to build a house? Professional builders know the current cost to build a new home is $89 to $160 per sq ft, or more, depending on the homeâs size, design, quality, and location. These costs per square foot do not include the cost of land, financing costs, builderâs overhead and general expenses, marketing costs, sales commission, or profit.