source:
  type: guide
  id: fnma-sel-b4-1.4-02
  authority: 'Fannie Mae Selling Guide B4-1.4-02 — Factory-Built Housing: Modular,
    Prefabricated, Panelized, or Sectional Housing'
  description: 'Fannie Mae Selling Guide B4-1.4-02 — Factory-Built Housing: Modular,
    Prefabricated, Panelized, or Sectional Housing.'
  coverage_tier: operative
obligations:
- id: fnma-sel-b4-1.4-02-full
  canonical_id: fnma-sel-b4-1.4-02-full
  section: 'Fannie Mae Selling Guide B4-1.4-02 — Factory-Built Housing: Modular, Prefabricated,
    Panelized, or Sectional Housing'
  type: do
  tags:
  - regulator-direct
  - fnma
  - selling-guide
  - corpus-expansion
  - tier-operative
  primary_source:
    tier: 1
    authority: 'Fannie Mae Selling Guide B4-1.4-02 — Factory-Built Housing: Modular,
      Prefabricated, Panelized, or Sectional Housing'
    source_class: fnma-guide
    source_url: https://singlefamily.fanniemae.com/media/document/pdf/selling-guide
    snapshot_id: 5f7b8b79da595d76
    fetched_at: '2026-05-25T14:09:57Z'
    content_hash: sha256:98cf85a02861bbe84914a0e339b327c8fc131869a8a573882007bbeea60c5701
    paragraph_quote: 'B4-1.4-02, Factory-Built Housing: Modular, Prefabricated, Panelized,
      or Sectional Housing (10/06/2021) Introduction This topic contains information
      on special appraisal considerations for modular, prefabricated, panelized, or
      Published May 6, 2026 599 sectional housing, including: Overview Appraisal Requirements
      for Modular, Prefabricated, Panelized, or Sectional Housing Comparable Selection
      Requirements for Modular, Prefabricated, Panelized, or Sectional Housing Overview
      Modular homes must be built under the International Residential Code (IRC) that
      is administered by the state agency that is responsible for adopting and administering
      building code requirements for the state in which the modular home is installed.
      Prefabricated, panelized, or sectional housing does not have to satisfy either
      HUD’s Federal Manufactured Home Construction and Safety Standards or the IRC
      that are adopted and administered by the state in which the home is installed.
      The home must conform to local building codes in the area in which it will be
      installed. For modular, prefabricated, panelized, or sectional housing eligibility
      requirements, see B2-3-02, Special Property Eligibility and Underwriting Considerations:
      Factory-Built Housing. Appraisal Requirements for Modular, Prefabricated, Panelized,
      or Sectional Housing Fannie Mae does not have minimum requirements for width,
      size, roof pitch, or any other speciﬁc construction detail for modular homes,
      or any other types of factory-built homes. Because quality can account for large
      diﬀerences in the values of factory-built homes, it is important for the appraiser
      to become familiar with the features that aﬀect the quality of a factory-built
      home so that the information can be included in the appraisal report if needed
      to support their opinion of value. Comparable Selection Requirements for Modular,
      Prefabricated, Panelized, or Sectional Housing The process of selecting comparable
      sales for factory-built housing is generally the same as that for selecting
      comparable sales for site-built housing. Fannie Mae requires the appraiser to
      address both the marketability and comparability of modular homes and other
      types of factory-built housing. When the subject property is modular, prefabricated,
      panelized, or sectional housing, it is not required that one or more of the
      comparable sales be the same type of factory-built housing, although using comparable
      sales of similar types of homes generally enhances the reliability of the appraiser''s
      opinion of value. Fannie Mae requires the appraiser to include in the appraisal
      report the most appropriate comparable sales data to support their opinion of
      value for the subject property. See B4-1.3-08, Comparable Sales, for general
      requirements regarding comparable selection. Recent Related Announcements The
      table below provides references to recently issued Announcements that are related
      to this topic. Published May 6, 2026 600 Announcements Issue Date Announcement
      SEL-2021-09 October 06, 2021'
  judgment: false
