In large-scale construction and infrastructure projects, efficient plumbing design is critical not just to functionality but to cost control, long-term performance, and regulatory compliance. At MJI Design, we specialize exclusively in professional plumbing design services—delivering precise, code-compliant, and constructible design documents for commercial, industrial, and mixed-use developments.
We do not offer physical plumbing services. Instead, our role is entirely design-based, supporting B2B clients such as mechanical contractors, plumbing contractors, architects, and developers with comprehensive plumbing system design tailored for performance, efficiency, and ease of implementation.
Why Plumbing Design Matters
In commercial construction, the plumbing system must be more than just functional—it must be engineered. That’s where MJI Design adds value. Our plumbing design services ensure:
-
Code compliance with local, state, and international plumbing codes
-
Hydraulic efficiency in water supply and drainage networks
-
Accurate pipe sizing and fixture unit calculations
-
Backflow prevention and cross-connection controls
-
Coordination with mechanical, structural, and architectural disciplines
-
Detailed documentation that enhances constructibility and reduces RFIs
Our expertise directly impacts timelines, budgets, and the end-user experience of your facilities.
Our Core Plumbing Design Services
At MJI Design, we provide an end-to-end plumbing design solution from schematic development through construction documentation. Below are our core offerings tailored for B2B projects:
1. Commercial Plumbing System Design
We design plumbing systems for:
-
Office buildings
-
Hospitals and healthcare facilities
-
Hotels and high-rise residential towers
-
Educational institutions
-
Industrial and manufacturing facilities
-
Retail centers and shopping malls
We work closely with MEP teams, general contractors, and architects to ensure our designs are fully integrated with the rest of the project disciplines.
2. Hot & Cold Water Distribution Design
Our team uses advanced hydraulic modeling tools to design efficient water distribution networks. We analyze:
-
Peak demand loads
-
Pressure zone management
-
Water heater sizing and location
-
Hot water recirculation systems
-
Thermal expansion and insulation strategies
We optimize layouts to ensure water conservation, minimal energy usage, and maximum comfort.
3. Sanitary and Vent System Design
Effective sanitary system design goes beyond gravity flow. We provide complete layout and sizing for:
-
Sanitary drainage systems
-
Grease waste and oil interceptor connections
-
Air admittance valves and stack venting
-
Coordination with site civil systems for connection points
-
Siphonic vs. conventional drainage options
We model the vent system to ensure uninterrupted drainage and compliance with all code-based venting strategies.
4. Stormwater Drainage System Design
For commercial roofs and site infrastructure, our storm drainage design includes:
-
Roof drain layout and sizing
-
Overflow scupper and secondary drainage
-
Stormwater detention and retention strategies
-
Underground pipe routing with slope management
-
Rain leader coordination and integration with site civil
We ensure stormwater handling is both efficient and environmentally responsible.
5. Specialty Plumbing Systems
Depending on the building type, MJI Design also delivers plumbing design services for specialty systems such as:
-
Medical gas piping (design only)
-
Compressed air systems
-
RO/DI and purified water systems
-
Acid waste neutralization
-
Laboratory waste and vent
-
Booster pump and sump pump selections
Our designs are developed in coordination with equipment vendors and manufacturer guidelines to ensure integration readiness.
Design Process: Precision from Concept to Construction
Our approach is built on collaboration, documentation clarity, and technical rigor. Here’s how we work with our B2B clients:
-
Initial Coordination & Project Kickoff
We assess the architectural design intent, occupancy types, and equipment schedules to develop a plumbing scope aligned with project goals. -
Code Analysis & Utility Research
Before design begins, we perform a detailed review of applicable codes (IPC, UPC, local amendments) and utility service availability. -
Design Development
Using Revit and AutoCAD, we create layouts, riser diagrams, equipment schedules, and plumbing calculations. Each stage includes internal QA/QC review. -
Construction Documentation
We produce sealed (if needed) plumbing design drawings including plan views, isometric details, control schematics, and notes. Every element is created for constructibility. -
Construction Support
Our involvement doesn’t end at drawings. We provide submittal reviews, RFI responses, and site clarification services throughout the build phase.
Why B2B Clients Choose MJI Design
1. Exclusive Focus on Plumbing Design
We’re not distracted by physical installations. Our single focus allows us to go deep into the design science behind every system.
2. Seamless Collaboration with Contractors
We speak the language of plumbing contractors. Our designs are always buildable and practical, minimizing field changes and delays.
3. Technical Precision, Every Time
From system head loss calculations to detailed coordination of fixture rough-ins, we deliver with accuracy.
4. Regulatory Insight
With experience across jurisdictions, we integrate code compliance into the earliest stages of the design—avoiding costly rework.
5. Fast Turnarounds & Scalable Resources
Whether it’s a single building or a multi-phase development, we have the team and tools to scale accordingly without sacrificing quality.
Industries We Serve
Our plumbing design expertise spans multiple sectors:
-
Healthcare: Critical system design for infection control and redundancy
-
Education: Efficient water distribution and drainage for high-usage environments
-
Hospitality: High-performance design for water-heavy applications like spas, kitchens, and guest rooms
-
Retail: Modular, flexible systems suited for tenant fit-outs
-
Industrial: Complex waste handling and specialty process plumbing
Let’s Design Your Next Project
If you’re a plumbing contractor, MEP engineer, or developer seeking a dedicated plumbing design partner, MJI Design is ready to support your next build. We take pride in technical accuracy, code compliance, and contractor-friendly deliverables.
Reach out today for a consultation, and let’s build smarter from the ground up—starting with the pipes.
About MJI Design
MJI Design is a full-service plumbing design firm serving commercial clients across the U.S. Our team brings decades of experience in technical plumbing layout, hydraulic calculations, and BIM documentation. We work exclusively with B2B partners and do not offer any physical plumbing work or residential services.
