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An addition and substantial improvement

Discussion in 'Floodplain Management' started by jar546, Feb 3, 2020.

  1. jar546

    jar546 *****istrator

    Oct 16, 2009
    Likes Received:
    We all know that an addition to a home in the special flood hazard area must comply with the requirements under your floodplain ordinance.

    At what point, however do you consider an addition as a trigger to upgrade the rest of the house if no other work is planned inside the house other than attaching the addition?
  2. Robert

    Robert Registered User

    Jan 29, 2016
    Likes Received:
    I don't know the answer but some jurisdictions will cite the 50% rule (ie: replace 50% of roof or siding and you need to replace all of it to conform to class A in the fire zones), or recently I hit their threshold of 1000 sq ft addition which triggered fire sprinklers throughout the whole house. We applied for an expensive AMMR which allowed fire sprinklers in only the addition (as opposed to the whole house). The most frustrating thing I learned is that everyone has their own definition of floor area.....the energy folks have their definition, the fire folks have theirs (called "fire area"), the building code floor area is based on height for habitable space, etc..... and none of them align.
  3. ADAguy

    ADAguy Registered User

    Sep 11, 2013
    Likes Received:
    If you add square footage, you expose yourself to more flood flow, thereby putting more stress on the existing construction.

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