BUILDING ENVELOPE
That area of a lot that has no building restrictions. The building envelope shall not include the area of any required setbacks (except for driveways which may cross yards), buffer yards, natural features with one-hundred-percent protection standard, and the portion of those natural features that may not be developed or intruded upon as specified in Part 18, Open Space and Environmental Protection Standards, of this chapter.

Areas outside of the building envelope of the lot for single-family detached dwellings only (the area of the lot excluding all required yard areas, setbacks and easements) may contain environmental resources as defined herein, provided that those areas so affected must be identified on the recorded plans for the subdivision or land development or on the building permit application and shall be subject to a deed restriction to prevent any disturbance or development of these areas.
See https://lowersouthamptontownship.org/permitsforms/ for more details about permits and forms.
See  https://lowersouthamptontownship.org/wp-content/uploads/2020/06/UCC_Permit_Application-w.-lstwp-logo-edits.pdf for forms for land development permits and building permits.