How Much Does a Prefab Home Cost?
Real Pricing Explained

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How Much Does Prefab Cost?

There is no single price for a prefab home—and that’s not a trick. Prefab pricing varies because builders often quote different parts of the project. This page explains how prefab costs actually work so you can compare options realistically and avoid surprises.

The Most Important Thing to Understand About Prefab Pricing

Most prefab projects are made up of three major cost buckets. Until you know which buckets are included in a quote, prices aren’t comparable.

The Three Cost Buckets

Prefab construction offers several meaningful advantages when conditions are right. These benefits are why prefab has become increasingly popular for ADUs and primary homes alike.

The Structure

This is the number most often advertised.

It typically includes:

  • Factory-built structure
  • Standard materials and finishes
  • Basic model configuration

It often excludes:

  • Foundation
  • Delivery and crane costs
  • Installation
  • Permits and fees

This is not a total project price—it’s a component price.

Site Work & Installation

Site work is where prefab budgets often change the most.

Common site work costs include:

  • Foundation and footings
  • Grading and drainage
  • Utility trenching and hookups
  • Access preparation
  • Installation and set day logistics
Site conditions vary widely and strongly influence total cost.

Soft Costs, Permits & Finishes

These costs are unavoidable but frequently overlooked.

They may include:
  • Permitting and plan check fees
  • Engineering and surveys
  • Impact fees
  • Appliance packages
  • Finish upgrades
Some builders include portions of this. Many do not.

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Very Rough Cost Ranges (For Expectations Only)

These ranges are meant to set expectations—not provide quotes.
  • ADUs: $150,000 – $400,000+
  • Small prefab homes: $200,000 – $500,000+
  • Custom modular homes: $400,000 – $800,000+
Location, site complexity, and scope all matter.

What Most Strongly Affects Total Cost

  • Site conditions and slope
  • Utility distance and capacity
  • Permitting requirements
  • Delivery and crane logistics
  • Finish level and customization
  • Delivery model (turnkey vs design-build)

Why Prefab Pricing Feels Inconsistent

Prefab pricing feels confusing because:

  • Builders define “included” differently
  • Marketing often highlights structure-only pricing
  • Site work is highly variable
  • Local rules affect scope
This doesn’t mean pricing is dishonest—it means context is required.

How to Compare Pricing Accurately

This doesn’t mean pricing is dishonest—it means context is required.

  • Ask what’s included and excluded
  • Confirm which cost buckets are covered
  • Share site details early
  • Compare total scope—not just structure price

Where to Go Next

Prefab Timeline

How long does it take to build a prefab or modular home? Learn the full prefab timeline, from planning and permits to delivery, installation, and inspections.
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