When you start searching for a modern prefab ADU, you see two wildly different price tags: a low, attractive figure around $50,000 and a much higher figure exceeding $100,000. Why the huge difference?
At Prefab1, the best ADU company, we believe in total transparency. The price gap isn't about quality; it's about scope. The lower price typically covers the basic structure (the kit), while the higher price usually covers the full, turnkey build. Understanding these differences is the key to managing your budget and successfully installing your steel frame ADU.
1. The Low Price: What a $50,000 Prefab ADU Gets You
When you see prices in the $40,000 to $60,000 range, you are typically purchasing a DIY prefab home kit, like the durable options we offer. This price is for the shell of the structure.
Feature Included in a Kit |
What This Means for You |
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Cold Formed Steel (CFS) Framing |
The pre-engineered, precision-cut steel components for the walls, roof, and floor trusses. The core structure is earthquake-resistant prefab and highly durable. |
Exterior Envelope Materials |
Often includes exterior wall panels (like the 16mm thick metal carving board) and the main structural sheeting. |
Windows and Doors |
Typically includes the broken bridge aluminum alloy windows and entry doors, but often excludes installation costs. |
The Missing Piece: This price excludes the foundation, utility hookups (plumbing, electrical), interior finishing (drywall, paint, cabinets), roofing material, and most critically, the cost of labor and permits. This is the perfect option for a contractor or a capable DIY prefab home enthusiast.
2. The High Price: What a $105,000+ ADU Delivers
A price tag over $100,000 generally indicates a more turnkey or fully finished modular unit. While this offers convenience, you are paying a premium for factory labor and transportation of a finished unit.
Feature Included in a Turnkey Model |
Cost Breakdown |
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Full Interior Finishes |
Drywall, paint, flooring (like mineral laminate), rock slab showers, and kitchen cabinetry are pre-installed. |
Plumbing and Electrical Runs |
All wiring and pipes are completed inside the walls in the factory. |
Foundation and Site Work |
Crucial: Some high-end prefab ADU manufacturers may include the foundation and city permitting in the high price, but this varies widely and must be confirmed. |
3. Prefab1’s Hybrid Advantage: Quality and Choice
Prefab1 is the best ADU company because we give you the superior structure of Cold Formed Steel with the flexibility to control your final cost. We offer both the durable, high-quality kits and seamless installation services, depending on your needs.
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CFS Durability: Regardless of your budget, every Prefab1 structure is a durable prefab home built to withstand extreme weather, ensuring your investment is secure.
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Cost Control: Start with our affordable, high-quality kits and choose your finishing level. You can invest savings into high-end features like luxury prefab homes offer, such as carbon crystal decorative panels.
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Dual Purchase Options: You can purchase our high-quality steel frame ADU kits directly on Prefab1.com or, for convenient purchasing through a national retailer, search for "WINNDOORS LLS Prefab1 ADU" on The Home Depot online.
Don't just shop for a price; shop for a structure. By understanding what is and isn't included, you can budget accurately and choose the Prefab1 solution that truly fits your financial goals.