Vermont § 4412 - Required provisions and prohibited effects Notwithstanding any existing bylaw, the following land development provisions shall apply in every municipality:

§ 4412. Required provisions and prohibited effects Notwithstanding any existing bylaw, the following land development provisions shall apply in every municipality:

• (1) Equal treatment of housing and required provisions for affordable housing. (A) No bylaw nor its application by an appropriate municipal panel under this chapter
  shall have the effect of excluding housing that meets the needs of the population
  as determined in the housing element of its municipal plan as required under subdivision 4382(a)(10) of this title or the effect of discriminating in the permitting of housing as specified in 9 V.S.A. § 4503. (B) Except as provided in subdivisions 4414(1)(E) and (F) of this title, no bylaw shall
  have the effect of excluding mobile homes, modular housing, or prefabricated housing
  from the municipality, except upon the same terms and conditions as conventional housing
  is excluded. A municipality may establish specific site standards in the bylaws to
  regulate individual sites within preexisting mobile home parks with regard to distances
  between structures and other standards as necessary to ensure public health, safety,
  and welfare, provided the standards do not have the effect of prohibiting the replacement
  of mobile homes on existing lots. (C) No bylaw shall have the effect of excluding mobile home parks, as defined in 10 V.S.A. chapter 153, from the municipality. (D) Bylaws shall designate appropriate districts and reasonable regulations for multiunit
  or multifamily dwellings. No bylaw shall have the effect of excluding these multiunit
  or multifamily dwellings from the municipality. In any district that allows year-round
  residential development, duplexes shall be an allowed use with dimensional standards
  that are not more restrictive than is required for a single-unit dwelling, including
  no additional land or lot area than would be required for a single-unit dwelling.
  In any district that is served by municipal sewer and water infrastructure that allows
  residential development, multiunit dwellings with four or fewer units shall be a permitted
  use on the same size lot as single-unit dwelling, unless that district specifically
  requires multiunit structures to have more than four dwelling units. (E) Except for flood hazard and fluvial erosion area bylaws adopted pursuant to section 4424 of this title, no bylaw shall have the effect of excluding as a permitted use one accessory dwelling
  unit that is located within or appurtenant to a single-family dwelling on an owner-occupied
  lot. A bylaw shall require a single-family dwelling with an accessory dwelling unit
  to be subject to the same review, dimensional, or other controls as required for a
  single-family dwelling without an accessory dwelling unit. The criteria for conversion
  of an existing detached nonresidential building to habitable space for an accessory
  dwelling unit shall not be more restrictive than the criteria used for a single-family
  dwelling without an accessory dwelling unit. (F) Nothing in subdivision (1)(E) of this section shall be construed to prohibit: