How It Works – Homeowners
Boss Built On Site Systems – Homeowners PRFAQ
California’s HCD-certified factory manufacturer and licensed general contractor introduces a smarter, faster way to build – energy-efficient, affordable, and accessible without cranes or costly delays.
The Problem
Building a home or ADU in California often means long timelines, labor shortages, multiple subcontractors, and endless inspections. Traditional construction can involve up to nine different trade licenses – from framing and insulation to electrical, plumbing, and HVAC – each requiring separate scheduling and inspection. Even factory-built modular homes, though faster, need heavy cranes and wide access that most backyards simply don’t allow. The result: projects that take ten months or more, exceed budgets, and frustrate homeowners.
The Breakthrough
Boss Built On Site Systems (BOSS) eliminates this complexity. As a California HCD-certified factory manufacturer and licensed California general contractor, BOSS delivers closed wall and roof panels – fully framed, insulated, sheathed, and vapor-sealed – on simple pallets that can reach any backyard. The home is built on site, not craned in, using conventional materials assembled through an advanced pre-engineered system. It’s modular performance without modular limitations.
The System
Each BOSS panel is a complete building element, constructed with light-gauge steel framing, interior drywall, exterior cement board, and high-performance PIR insulation for superior energy efficiency and fire safety. These pre-engineered wall and roof systems are code-certified under ER-0658, meeting or exceeding all California building requirements. By collapsing multiple trades – framing, sheathing, insulation, vapor barrier, drywall, and exterior cladding – into one product, BOSS reduces both coordination and inspection cycles. The result: a paint-ready Shell & Core that’s stronger, cleaner, and faster to build.
The Benefits
BOSS cuts total construction timelines by up to 50% and labor costs substantially by eliminating redundant subcontractors and inspection delays. Light-gauge steel framing provides a permanent advantage – no termites, no rot, no warping, no fire risk – and every project stays on time and on budget. The simplified on-site assembly reduces waste, lowers freight costs, and requires no cranes, making the system ideal for any California property.
Proven in California
Since 2018, BOSS has built or has underway over 1,000 units across California, including Tiny Houses and ADUs. By combining state certification, field experience, and cost control, BOSS delivers a proven path to attainable housing for every homeowner.
Your Next Steps
Choose from eight pre-designed ADUs – Studio, One-Bedroom, Two-Bedroom, and Three-Bedroom models – each available in Core or Plus versions. For larger projects, select a Shell & Core custom home package: a complete structural build ready for your finishing contractor. Build in half the time. Build better. Build on budget. Call 844.620.3990 to schedule your Feasibility Study today.
Frequently Asked Questions
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What is a Boss Built On Site System?
It’s a complete on-site building system that combines factory precision with field flexibility. Our team comes to your property and builds the structure on site – walls, roof, windows, doors, and rough Mechanical, Electrical and Pluming – delivering a turnkey Shell & Core home ready for finishing. No cranes, no prefabricated boxes, just smarter building.
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How is it different from prefab or modular homes?
Volumetric modular homes are built as full boxes that must be craned into place, making them expensive and often impossible to customize or deliver in backyards. BOSS panels arrive on simple pallets, assembled on site by our licensed crews, offering modular speed with full design freedom.
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How much faster is it?
A typical ADU built with BOSS takes about five months from permit to completion – versus ten months or more for a traditional stick-built project.
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Why is it more affordable?
The real savings come from labor efficiency and rapid on-site assembly – and from avoiding crane logistics entirely.
No cranes or special access needed. Volumetric modules usually require street closures, rigging, permits, and a large crane (plus staging space) to lift boxes over a house into the backyard. BOSS panels arrive on simple pallets and move through side yards – no crane, no street closure, no heavy-lift costs.
– Fewer trades and inspections. Traditional Shell & Core builds in California rely on many subcontractors (framing, insulation, drywall, exterior board, roofing, electrical, plumbing, HVAC, windows/doors) with multiple rough inspections. BOSS collapses those scopes into one integrated, code-certified process – cutting coordination, rework, and schedule risk.
– Faster, shorter schedule. Rapid installation reduces total labor hours and general conditions (site supervision, dumpsters, porta facilities, equipment rentals), which are silent budget killers on long projects.
– Less waste, fewer surprises. Factory-precision panels minimize material waste and field error, so you stay on time and on budget. -
What is the division of responsibility between the homeowner’s GC and BOSS?
The homeowner’s General Contractor can delegate the entire Shell & Core build-up to BOSS.
– BOSS Scope: Walls, roof, windows, doors, and all rough MEP – a paint-ready structure.
– GC Scope: Civil works, utilities, final interior finishes, and furnishings.
This partnership keeps projects simple and predictable. -
What makes BOSS certified and credible in California?
BOSS is both a California HCD-certified factory manufacturer and a licensed general contractor, an uncommon dual qualification. Our wall and roof systems are certified under ER-0658, ensuring compliance with all state building and energy standards.
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What materials are used?
Every BOSS structure uses light-gauge steel framing, PIR insulation, drywall interiors, and cement board exteriors for maximum energy performance, durability, and safety.
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What ADU models are available?
Studio Series: 240–336 sq ft
One-Bed Series: 400–500 sq ft
Two-Bed Series: 800 sq ft in Basic, Core, or Plus versions
Three-Bed Core: 1,200 sq ft
Each can be customized for finishes, layouts, and site conditions. -
Can BOSS build my custom home?
Yes. Our Shell & Core package delivers the complete structure – walls, roof, doors, windows, insulation, and rough MEP – ready for your finishing contractor to personalize.
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What inspections does BOSS handle?
All inspections related to the Shell & Core are handled under our licensed scope, reducing the process from six rough inspections to one coordinated sign-off. This streamlines scheduling and keeps builds on track.
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How does permitting work?
BOSS manages permitting and coordination with your city or county, ensuring compliance with California Building Code and HCD requirements.
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How do I start?
Schedule your Feasibility Study at BuiltOnSiteSystems.com. We’ll analyze your property, finalize layout and finishes, prepare the permit package, and provide a fixed proposal and timeline.
