Understanding How Modular Homes Are Built: Inside the Factory and On-Site Day

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Unlike traditional homes, modular homes are constructed in a warehouse, transported to the build site, and assembled. If you've ever wondered how modular homes are built, step-by-step, this guide explains what you need to know.

Step 1: The Design, Floor Plans, and Initial Engineering

Modular construction begins with the design. Modular homes are highly customizable across models.

  • You'll choose a base model and customize it, adding extra bedrooms or bathrooms, offices, garage space, and more as desired.
  • Consider your budget, desired size, layout, and styles. You're free to design your dream home.
  • Choose a manufacturer that knows local building code compliance, regulations, and zoning laws. Modular homes may require special permits.
  • Consider the land you want to use. Environmental factors, utilities, topography, and local regulations may influence the design.

Step 2: Building the Modular Home Inside the Factory

The modular home build begins. Individual pieces called modules are constructed in the modular home factory on an assembly line. The frame and structural components are first. Then, the wiring, plumbing, external rough-ins, insulation, drywall, and extra components like cabinets, shelving, and mirrors are installed. Approximately 80% to 90% of the build is finished off-site.

Here's what happens in the factory versus on your land:

Factory

On-Site

Structural framing Module assembly
Base floors and walls Some drywall finishing
Doors and windows Roofing, siding, and HVAC
Wiring and plumbing rough-ins Utility connections and turn-on
Insulation Cabinets, furniture, and appliances
Drywall finishes Tile, wood floors, and fixtures

Step 3: Quality Control and Inspections

All modules must meet quality and safety standards. An assessment isn't exclusively done at the factory. It's a multistep process, including after the home is assembled. Official inspectors are involved, especially after the home is built. Modular homes are held to the same standards as conventional homes.

Step 4: Transportation and Delivery Day

Modules are transported to the build site using specialized trucks and cranes. Other supplies may be transported, like roofing, electrical, plumbing, and extra drywall.

The site may also be prepped by:

  • Clearing the land of obstacles.
  • Grading for a level surface and proper water drainage.
  • Stabilizing the foundation.

Step 5: Set Day and Module Assembly

Modular home assembly happens on-site. Modules are assembled, aligned, secured, and sealed. Interior finishes, like cabinetry, interior customizations, flooring, decor, and appliances, are installed.

Guardian Homes by Keystone also spackles and sands drywall, paints, installs interior mouldings and archways, and handles gutters and downspouts outside.

Step 6: On-Site Finish Work and Final Walk Through

A final walk through is completed with the customer to ensure the home meets their standards. The homeowner has the opportunity to ask questions or raise concerns and review the build.

Have Questions? Get in Touch

Have Questions? Get in Touch

Guardian Homes by Keystone provides premier modular homebuilding services across PA, MD, VA, and WV. Learn more about the modular construction process and start designing your dream home now!

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