In most real-world projects, the printer is used to create the wall system, not the entire house.
Site and Foundation
Everything starts the same way as a traditional build:
- Site prep
- Grading
- Foundation or slab
The print system works off that base, so accuracy here matters.
The Printing Process
A robotic system extrudes a cement-based material in layers, following a programmed path. Over time, this builds up the wall structure.
The result is typically a layered concrete wall system, which can be engineered to meet structural requirements.
Openings for doors, windows, and mechanical systems are planned in advance.
Integration With Trades
Once the shell is complete, the rest of the build continues:
- Electrical and plumbing rough-ins
- Roof installation
- Insulation and finishes
- Drywall or interior treatments
This is where coordination is critical. The shell has to be designed with the rest of the build in mind.
Finishing
Printed walls don't always stay exposed.
Depending on the project, they can be:
- Coated
- Smoothed
- Integrated into standard interior finishes
Exterior treatments also vary based on design goals and local conditions.
What It Is and What It Isn't
- A structural system
- A way to automate part of construction
- A tool for consistency and repeatability
- A complete home solution
- A replacement for builders or trades
- A one-size-fits-all method
Common Questions
What parts of the home are 3D printed?
The 3D printed system produces the structural exterior wall system: the full perimeter walls from the foundation base to the roof line. The printed wall is a structural assembly with provision in the wall build-up for the project insulation strategy and the exterior finish, delivered as one wall system. What is not 3D printed: the foundation slab, the roof system, interior partition walls, windows, doors, MEP systems, and interior finishes. Those are installed by standard trades after the wall system is complete. The printed concrete wall is the proposed scope; reinforcement, grout, insulation, moisture control, coatings and finishes depend on the engineered assembly and may require separate work. Interior partition walls are typically framed conventionally after the shell is enclosed, the same way they are in any concrete construction project.
What finishes are needed after the shell is printed?
After the shell is printed and the curing verification is complete, the project transitions to standard residential construction sequencing. The finish work required is the same as any concrete or ICF home: (1) Roofing system: truss or rafter system, sheathing, underlayment, and roofing material. (2) Windows and exterior doors. (3) MEP rough-in: electrical, plumbing, and HVAC. (4) Interior partition walls: typically light-gauge steel or wood framing. (5) Drywall on interior faces of the concrete walls and partition walls. (6) Flooring, cabinetry, trim, and paint. (7) Fixture installation and final MEP connections. (8) Landscaping and site work. Final inspections and the certificate of occupancy come at the end. None of these trades are proprietary or require specialized knowledge of 3D printing. Any subcontractor experienced with concrete or ICF construction can work on a 3D printed shell. The shell is the handoff point, and everything after it is standard residential construction. The builder's existing subcontractor relationships and scheduling process apply from the shell handoff forward, and Coastal Monolithic provides the technical documentation package to support permitting and inspection throughout.
Can you add a second story to a 3D printed home?
Multi-story 3D printed concrete construction is technically feasible and has been demonstrated on projects globally. The structural capacity of the high-strength concrete wall system supports multi-story loads. The practical considerations for a specific project depend on the design, the site, and the engineering requirements for the upper floor system. Single-story construction is the current focus for the Coastal Monolithic pilot and Innovation Enclave projects in Southwest Florida, where single-story concrete construction is the dominant residential form. Multi-story designs are a conversation for specific projects. If you have a multi-story project in mind, reach out directly and we will give you a straight answer on feasibility.
Can you run electrical and plumbing through a 3D printed concrete wall?
Yes. Electrical conduit, plumbing penetrations, and HVAC chases are planned during the design phase and incorporated into the print file before construction begins, and the robotic system accommodates planned penetrations and chases in the wall system. MEP (mechanical, electrical, plumbing) rough-in is then handled by the builder's standard subcontractors, the same way it is on any concrete construction project. The key difference from wood-frame is that conduit runs, plumbing penetrations, and HVAC chases must be coordinated during the design and print preparation phase, before the print file is finalized, so they are in the correct location when the shell is complete. Post-print, electricians and plumbers work the same way they would on any concrete construction project. Coastal Monolithic coordinates with the builder's MEP subs during the design phase to ensure the print file reflects the actual MEP layout. This is a standard part of the pre-construction process.