Don't Start Without Checking These First
Building a barn in Ontario involves multiple regulatory layers. Starting construction before you have the right approvals can result in costly delays, fines, or even being forced to relocate your building. Here are the key risks to address before you begin.
Timeline Risk
Approval processes take several weeks to months. Starting late can delay your entire construction season. Delays can cost you a full growing season.
Key Risks to Address
Minimum Distance Separation (MDS) — your barn may not meet required distances from neighbours
Setback requirements from wells, watercourses, and property lines
Nutrient Management Strategy (NMS) requirements for livestock housing
Nutrient Management Plan (NMP) if your operation exceeds 300 nutrient units
Municipal building permit and site plan requirements
Environmental compliance considerations
What to Check First
Calculate your MDS I and MDS II distances
Confirm your proposed site meets all setback requirements
Determine if you need an NMS, NMP, or both
Review your nutrient unit count
Talk to your municipality about building permit requirements
Consult with a nutrient management professional
Before You Build Checklist
Before you break ground on your barn project, make sure you've checked the following:
Nutrient units — know how many NU your operation will generate and whether you trigger the 300 NU threshold
Manure storage capacity — confirm you have or will build enough storage to meet the 240-day requirement
MDS setbacks — verify your proposed site meets MDS I and MDS II requirements
Wells and drains — check distances from all wells (yours and neighbours') and tile drains
Slope and runoff risk — evaluate your site for slope, drainage, and potential runoff pathways
Not Sure What Your Farm Needs?
If you are unsure whether you need an NMS, NMP, NASM Plan, MDS review, or nutrient unit calculation, start with one of these free tools.
Can I Build a Barn Here?
Check whether a proposed barn location may be constrained by MDS, setbacks, or nearby land uses.
Use the Advanced Preliminary MDS Screening Tool
Estimate detailed MDS-related setback planning for livestock barns and manure storage.
Calculate Nutrient Units
Estimate livestock nutrient units to help determine whether NMS or NMP requirements may be triggered.
Building a Barn in Ontario FAQs
What permits do I need to build a barn in Ontario?
Do I need a Nutrient Management Strategy before building a barn?
What should I check before designing a livestock barn?
Can I build a barn anywhere on my farm?
Does a farm building always need engineering?
Does a manure storage need a building permit?
Can the builder handle the NMS?
What if I am expanding an existing barn?
Can I start construction while waiting for approvals?
Can a barn location fail because of a neighbour?