Here in NJ, a "Homeowner" may prepare plans for a renovation or addition to
their primary residence; however, be prepared for the most thorough plan
review you could imagine.
New construction in most jurisdictions requires that a licensed architect
prepare the plans for a single family dwelling. For larger commercial or
public buildings, the state requires that the structural, mechanical,
electrical and civil portions of the project must bear the seal of the
appropriate design engineer.
We live in Washington state, and designed and built our own home. I drew
up our plans myself on my computer, printed to regular letter size pages,
and had no problems whatsoever getting the plans approved. Even the
inspectors were great to deal with and often seemed eager to see our
progress from one visit to the next.
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