Just as all lots are not of the same depth as the standard lot, it is also true that all lots are not of the standard width. No rule can be laid down which can be applied in every case to determine the relative value of lots of greater or less width than the standard lot. The use to which the plot should be put to produce the greatest rent will usually be the determining factor.

Some lots can be valued on the basis of so much per front foot regardless of width. A narrow lot (unless it be so narrow as to be practically useless) under such circumstances would have a value in direct proportion to its width. An example of this is land fronting on a street where small retail shops are located. There are many locations however where width is important and where narrow lots have less relative value. This is the case in localities suitable for buildings requiring large units of land. An isolated narrow lot could not here be valued on the same basis as larger units. In the ordinary dwelling house neighborhood values usually run proportionate to width.

There are some plots of irregular shape. Average width and average depth is ascertained and values computed on that basis. Lots that are merely gores or so irregular as to be incapable of use, and interior plots having no street frontage are difficult to appraise independently, being of value only when combined with adjoining land.