Plumbing Design Services in Ontario
Permit-ready residential and commercial plumbing designs — pipe sizing, drainage layouts, fixture schedules, isometric risers — stamped by a PEO-licensed engineer in 3–5 business days.
Get a Free QuoteWhat's Included
- Domestic cold and hot water system sizing and pipe layout design
- Hot water recirculation loop design for instant hot water at all fixtures
- Fixture unit calculations and demand flow analysis per OBC
- Pipe sizing for supply, sanitary, and storm drainage per OBC requirements
- Isometric riser diagrams for multi-storey projects
- Sanitary and storm drainage layout with sump and ejector specifications
- Fixture schedule, valve selections, backflow prevention devices
- Thermostatic mixing valve specifications for scald protection
- Stamped drawings ready for permit submission
Turnaround
3–5 business days from receipt of architectural drawings. Rush service is available for urgent projects.
Deliverables
- Stamped plumbing plan drawings (PDF) — supply, sanitary, and storm
- Isometric riser diagram (multi-storey projects)
- Fixture schedule and valve list
- Pipe sizing calculation sheets
- Backflow prevention and TMV specification sheet
Codes & Standards
- OBC 2024 Part 7 — Plumbing
- OBC 2024 Part 9 — Section 9.31 — Plumbing Systems (residential)
- CSA B64 — Backflow Preventers and Vacuum Breakers
- ASHRAE — Plumbing Engineering Design Guide (reference)
- Ontario Water Resources Act (where applicable)
Who This Is For
Homebuilders, architects, and commercial tenants requiring permit-ready plumbing drawings for new construction or renovation. Particularly useful for projects where the mechanical and plumbing packages are coordinated together under one engineering firm.
Frequently Asked Questions
Do you design both supply and drainage plumbing?
Yes. Our plumbing package covers the full scope — domestic cold and hot water supply sizing and layout, sanitary drainage, storm drainage, and all associated details including fixture unit calculations, pipe sizing, and riser diagrams.
Can plumbing design be bundled with HVAC design?
Yes, and we recommend it. When HVAC and plumbing are designed together under one engineer, the coordination between mechanical room equipment, drain connections, and pipe routing is handled efficiently in a single drawing set.
Do you design for multi-unit residential buildings?
We focus on single-family homes and small multi-unit residential and commercial buildings. For large multi-unit or high-rise projects, contact us to discuss scope and we'll confirm if the project fits our practice.
What is a hot water recirculation loop and do I need one?
A hot water recirculation loop maintains hot water at all fixture locations by continuously circulating water from the water heater through the hot water supply piping and back. It eliminates the wait for hot water at distant fixtures. It is increasingly required in larger homes and is a standard spec in quality residential construction.