Fully Custom Design
Bring us your architect’s concept, or start with our in-house design team. We turn distinctive ideas into factory-built luxury cabins, crew suites, and connected modular spaces, designed around your property and the people who will use them.
Starting at $59,000
Typical range from $59,000 to $151,500 per unit, depending on design complexity.Domestic delivery and site work are additional.The essentials
Custom layouts, sizes & construction
Tell us what you want to create: a short-term stay, a space that feels more like home, multiple private suites, or a larger connected layout. We design a custom unit and layout around your property, your guests, and your operation.
These examples show the range of sizes, layouts, and construction methods we can explore with you. We share options, listen to your feedback, and refine the design together before developing the manufacturing package.
01 / Short-term stays
An efficient layout can make a compact stay feel complete. This 10.5 ft × 24 ft example brings sleeping, a kitchenette, and a bathroom into 252 sq. ft. We design around your guests and property, balancing comfort, circulation, and the essentials for a short-term stay.
02 / Maximize a park model RV
Park model RV designs can reach up to 400 sq. ft. This example explores a home-like layout under 400 sq. ft., with distinct living, kitchen, bedroom, and bathroom spaces. We work with you to make the most of the footprint and shape a comfortable place to settle in, with outdoor space extending the experience.
03 / Modular hotels & staff housing
A single factory-built unit can contain multiple independent rooms or suites, each with its own entrance. For hotels and staff housing, we develop the room count, privacy, storage, and bathroom configuration around your operation. This example shows how several separate guest spaces can share one unit’s structure.
04 / Large layouts & modular assembly
Larger layouts are designed as separate transportable modules. We ship them individually, then assemble and connect them on site to create one larger space. The two dashed lines show how this example divides into three shipping modules. Together, we refine your layout, module connections, and assembly plan around your property and the way you want to use it.
Dashed lines mark the three example shipping modules. Final divisions are developed during custom design and engineering.
We can design multiple custom modules to connect, combining individual units into a larger, continuous space. Each module ships separately and is assembled with the others on site to create a space larger than a single transportable unit. The dimensions above are the maximum for one module; we develop the overall layout and connections around your project.
We begin by exploring your ideas, the people who will use the space, and the experience you want to create. Complex shapes, distinctive materials, and ambitious concepts are welcome.
When you move into paid design, our team develops one distinct unit design into a complete manufacturing package. You own that package and can choose whether to place a production order with SandBox.
The five-unit minimum applies to production, not the purchase of the design package.
Design-fee credits begin after your first 10 units. Receive $2,500 toward each of units 11–20, recouping the full $25,000 design fee when you reach 20 units.
The five-unit minimum still applies to production. Cumulative orders count toward the credit, and unused credit carries forward with no expiration.
| Units ordered | Total credit | Fee credited |
|---|---|---|
| 5 | $0 | 0% |
| 10 | $0 | 0% |
| 11 | $2,500 | 10% |
| 15 | $12,500 | 50% |
| 20 | $25,000 | 100% |
The customer came to SandBox with a concept developed by their architect. Our role was to work out how to manufacture it—from the curved form to the distinctive scale cladding—and bring it into production. Compare the architectural rendering with the completed unit below to see how the design carries through into the finished form, glazing, and cladding.
Desert Reef is the customer’s exclusive design. It is shown here as an example of our custom work, not a unit offered for sale to other customers.
Explore concepts, refine the layout, and complete the manufacturing documentation. Design time depends on your project and is separate from production and shipping.
Allow 60 days of production after design lock.
Plan on roughly 2–3 months after design lock, with final site arrival coordinated around domestic transportation and site readiness.
We can help coordinate transport and placement. Some units arrive on wheels; others require a crane. These costs depend on your project.
You own your paid design package and may take it to another manufacturer. Your design remains exclusive when SandBox manufactures it; exclusivity does not continue if you use another manufacturer.
The $25,000 fee covers a single distinct unit design. We confirm the construction path—park model RV (PMRV), trailer / fifth wheel, or modular construction—with you at the start. Site design and site-specific engineering are not included. Engineering-stamped drawings for modular construction may carry additional fees depending on state requirements.
The unit is supplied with a 30-amp or 50-amp electrical hookup, a ¾-inch garden-hose water connection, and a 3-inch sewer connection. Your team provides the on-site utilities and foundation or prepared support surface appropriate for your site.