Within any district established by this chapter or amendment that may later be adopted there exist:

Nonconforming uses are declared by this chapter to be incompatible with permitted uses in the districts involved. A nonconforming use of a structure, a nonconforming use of land, or a nonconforming use of a structure and land in combination shall not be extended or enlarged after passage of this chapter by the addition of other uses of a nature which would be prohibited generally in the district involved.

To avoid undue hardship, nothing in this chapter shall be deemed to require a change in the plans, construction, or designated use of any building on which actual construction was lawfully begun prior to the effective date of adoption or amendment of this chapter and upon which actual building construction has been carried on diligently. "Actual construction" is hereby defined to include the placing of construction materials in permanent position and fastened in a permanent manner. Where excavation or demolition or removal of an existing building has been substantially begun preparatory to rebuilding, such excavation or demolition or removal shall be deemed to be "actual construction."

In any district a permitted building and customary accessory buildings may be erected on any single lot on record at the effective date of adoption or amendment of this chapter, not withstanding limitations imposed by other provisions of this chapter. Such lot must be in separate ownership. This provision shall apply even though such lot fails to meet the requirements for area or width, or both, that are generally applicable in the district; provided, that yard dimensions and requirements other than those applying to area or width, or both, of the lot shall conform to the regulations for the district in which such lot is located. Variance of yard requirements shall be obtained only through action of the Zoning Hearing Board.

If one or more lots are on record in the office of the Recorder of Deeds of Lebanon County and have been duly approved by the Township Commissioners, they may be developed according to the recorded plan even though said lots may not conform with the requirements for area or width or both that are generally applicable in the district. However, no portion of said lots or parcels shall be used or sold in a manner which further diminishes compliance with lot width and area requirements as established by this chapter.

Where at the time of passage of this chapter lawful use of land exists which would not be permitted by the regulations imposed by this chapter, and where such use involves no individual structure with a replacement cost exceeding $1,000, the use may be continued so long as it remains otherwise lawful, provided:

Where a lawful structure exists at the effective date of adoption or amendment of this chapter that could not be built under the terms of this chapter by reason of restrictions on area, lot coverage, height, yards, its location on the lot, or other requirements concerning the structure, such structure may be continued so long as it remains otherwise lawful, subject to the following provisions:

If a lawful use involving individual structures with a replacement cost of $1,000 or more, or of structure and premises in combination, exists at the effective date of adoption or amendment of this chapter, the lawful use may be continued so long as it remains otherwise lawful, subject to the following provisions: