Published: June 16, 2025 | Closer Look Home Inspectors · InterNACHI Certified · Mankato, MN

Modular vs Manufactured Homes: Inspection Differences Explained

By Closer Look Home Inspectors | Updated June 2025 | (507) 721-3820

Factory-built housing, including both modular and manufactured homes, represents a significant segment of the housing market in southern Minnesota. These homes offer affordability and quality that has improved dramatically over the decades, but they have distinct inspection considerations depending on their classification. Understanding the differences between modular and manufactured homes is essential for buyers, as the classification affects construction standards, financing options, and long-term value.

Manufactured Homes (HUD Code)

Manufactured homes are built to the federal HUD code (Housing and Urban Development), which has governed manufactured home construction since June 15, 1976. Key characteristics include:

• Built entirely in a factory and transported to the site on a permanent chassis
• Must display a HUD certification label (red or silver tag) on the exterior
• Built to a national standard rather than local building codes
• May be placed on a permanent foundation or on piers and blocking
• Title status varies: may be titled as personal property (like a vehicle) or real property depending on installation

Manufactured Home Inspection Priorities

• Foundation and anchoring: Manufactured homes must be properly anchored to resist wind loads. The anchoring system must be intact and functional. Homes on piers and blocking must have level, stable support.
• Marriage line (multi-section homes): Where two sections join, inspect for proper sealing, structural connection, and weather-tight joints at the roof, walls, and floor.
• Skirting and ventilation: Crawl space skirting should be intact to prevent animal entry and protect plumbing from freezing. Adequate ventilation prevents moisture accumulation under the home.
• Plumbing and crossover connections: Water and drain connections between sections and between the home and site utilities must be properly made and insulated against freezing.
• Electrical service: Verify the electrical service meets the home's demand and that all connections comply with applicable standards.
• Roof condition: Many manufactured homes have lower-slope roofs with metal covering. Check for rust, fastener failure, and seam separation.

Modular Homes (State Building Code)

Modular homes are built in factory sections but must comply with Minnesota's state building code, the same code that governs site-built homes. Key differences from manufactured homes include:

• Built to the same building code as site-built construction
• Transported to the site without a permanent chassis; sections are placed on a permanent foundation
• Inspected by state-approved third-party agencies during construction
• Titled as real property like any site-built home
• Eligible for conventional mortgage financing

Modular Home Inspection Priorities

• Section connections: Where factory-built sections join, verify structural connection, weather sealing, and integration of mechanical systems.
• Foundation: Modular homes require the same permanent foundation as site-built homes. Standard foundation inspection applies.
• Site-completed work: Roof sections, exterior finish, decks, garages, and site grading are typically completed on-site by local contractors. Quality of this site work is a key inspection focus.
• All standard inspection items: Because modular homes are built to the same code as site-built homes, all standard home inspection procedures apply.

Pre-1976 Mobile Homes

Homes built before June 15, 1976, predate the HUD code and were built to varying standards. These older mobile homes present additional concerns including structural inadequacy for Minnesota's snow and wind loads, obsolete electrical systems, single-wall construction with minimal insulation, and aluminum wiring in many 1960s-era units. While some have been well-maintained, many have exceeded their useful design life.

Minnesota-Specific Considerations

• Wind anchoring: Minnesota requires manufactured homes to be anchored for wind resistance. Verify anchor straps and ground anchors are present and in good condition.
• Frost protection: Plumbing in manufactured homes is particularly vulnerable to freezing. Heat tape, pipe insulation, and skirting must be adequate for Mankato's subzero winters.
• Radon: Both manufactured and modular homes are susceptible to radon. Radon testing is recommended regardless of home type.
• Energy efficiency: Older manufactured homes often have inadequate insulation for Minnesota's climate. Our thermal imaging reveals specific insulation deficiencies.

Buying a manufactured or modular home? Call Closer Look Home Inspectors at (507) 721-3820 for experienced evaluation of factory-built homes.