The problem we set out to solve is simple and frustrating: builders and homeowners in Simcoe County and across Ontario were routinely losing weeks to rejected permit submissions — not because the building was wrong, but because the HVAC package was incomplete, stamped incorrectly, used the wrong design temperature, or wasn't formatted for the municipality's portal. We wrote an entire guide on why heat loss calculations get rejected by Ontario building departments — the causes are almost always paperwork, not engineering.

We are based in Simcoe County and have been designing and building homes here for years through our partner icfhome.ca. We know that Barrie uses -24°C and Collingwood uses -22°C. We know that Oro-Medonte requires Cloudpermit and a Zoning Certificate before the building permit, that Wasaga Beach requires a Road Occupation Permit uploaded alongside the building application, and that Tiny Township's one-month review clock only starts on a complete submission. We know these things because we've dealt with every one of them on real projects.

What started as the engineering we did in-house for our own builds became a standalone service when other builders started asking us to produce their permit packages. The demand made sense — finding a BCIN-registered HVAC designer who knows North Simcoe and Georgian Bay's specific building department requirements, and who can turn around a stamped package in 48 hours, is harder than it should be. You can read more about what a complete permit package includes on our CSA F280 heat loss service page.

Ontario Heat Loss & BCIN Design is a focused service. We don't do site visits, we don't install equipment, and we don't manage your build. We produce accurate, correctly-formatted, BCIN-stamped mechanical drawings and heat loss calculations that pass your building department on the first submission. That's the whole service. We've designed it to be fast, flat-rate, and reliable — because that's what builders and homeowners actually need. For a deeper understanding of what heat loss calculations mean for a new home build, our partner site has a plain-English breakdown.

We work with homeowners managing their own self-builds, contractors who need a reliable HVAC designer on call, and architects who need a BCIN stamp on their mechanical drawings. Every project — from a 900 sq ft Tiny Township cottage to a 6,000 sq ft Muskoka custom home — gets the same attention to the correct design temperature, the right portal format, and the local submission requirements that protect your timeline. If you're planning a cold-climate heat pump as your primary heating system, see our heat pump sizing service — sizing from your actual CSA F280 heat loss is the only way to get it right in Ontario winters.