Second Story Additions Sherborn MA: Permits, Costs, Timeline

Adding a second story is the most efficient way to gain square footage on a lot that cannot grow sideways. It also touches nearly every system in the house, so the planning phase matters more than the framing phase.

Expect permitting to run several weeks, longer if the property sits in a historic district or near wetlands. A structural engineer will need to confirm that the existing foundation and first floor framing can carry the new load.

Budget in three buckets: structure, systems and finishes. Structure is predictable, systems depend on the age of the house, and finishes are where the number moves the most.

A typical project runs three to five months from demolition to final inspection, with the house weather-tight again within the first few weeks.