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How Factory Modules Become a Permanent House

The crane set is visually dramatic, but the permanent house results from a longer chain of foundations, connections, inspections and finishing work.

Reviewed for destination-code contextInternational with U.S. and Canadian emphasis
Permanent-home context: This guide uses “modular home” for a code-compliant building made as three-dimensional modules, transported to a permanent site and assembled on an approved foundation. It does not use the term as a synonym for a trailer, mobile home or HUD-code manufactured home.

Before delivery

Approved drawings establish foundation dimensions, bearing points, module connections and service locations. The site team must complete excavation, concrete work, access preparation and any required inspections before transport is released.

Factories often need verified foundation measurements because small discrepancies can disrupt the set. The crane contractor and carrier also need a safe staging and lifting plan.

During the set

Modules are lifted or rolled into position in a planned sequence. Crews align the units, install specified structural connections, close marriage-line gaps and protect the building from weather.

Temporary bracing and fall protection are part of the set plan. The work should follow engineered lifting points and connection details rather than improvised field changes.

After the set

Trades connect electrical, plumbing, heating, ventilation and communication systems across module boundaries. Exterior siding, roofing, stairs, decks, porches and garage interfaces may still require substantial completion.

Final inspections verify both factory and site work. Occupancy normally depends on completed life-safety systems, utilities, access and documentation—not simply on the modules being placed.

Apply this guide to a real project

For how factory modules become a permanent house, create a dated project note tied to the destination address and current drawing revision. Identify the authority, designer, factory or contractor responsible for each unresolved item. Attach the written evidence for ‘Is the foundation survey or measurement confirmation complete?’ and ‘Who controls the carrier, crane, rigging and set crew?’ rather than recording a verbal assurance.

Before a deposit, production release, shipment or final payment, convert every open question into a named action with an owner and deadline. Keep superseded drawings and decisions in the record so later inspectors, lenders, insurers and future owners can understand why the completed house differs from an early sales plan.

Questions to resolve before proceeding

  • Is the foundation survey or measurement confirmation complete?
  • Who controls the carrier, crane, rigging and set crew?
  • How will the building be weather-protected immediately after placement?
  • Which inspections and utility approvals remain before occupancy?
Stop point: Do not schedule delivery until the foundation, access, crane plan and inspection sequence have all been confirmed.

Primary references to check