First: don’t panic. What Ontario building departments issue is almost never a permanent rejection — it’s a deficiency notice, a list of corrections your application needs before review continues. On the mechanical side, the causes are remarkably predictable: the wrong design temperature, a missing MVDS, an unsigned Schedule 1, a missing BCIN stamp, or a sizing “calculation” that was really a square-footage guess. Every one of those is fixable fast.
We fix rejected mechanical submissions for a living: send us the deficiency notice and your plans, and we deliver corrected, BCIN-stamped documents — CSA F280 heat loss, MVDS, Schedule 1, mechanical drawings — formatted for your municipality, in 48 hours. See also our guide to why heat loss calculations get rejected.
A Toronto -18°C calculation submitted in Barrie (-24°C) or Muskoka (-26°C). Reviewers check the SB-1 value first — it’s the fastest deficiency to spot and the most common one we correct. See design temperatures by municipality.
The Mechanical Ventilation Design Summary became mandatory under OBC 2024. Packages prepared from pre-2025 templates simply don’t include it — and the application stops until it appears.
The designer declaration is a separate form, not the stamp on the drawings. Missing or unsigned, the application is returned before technical review even begins.
The designer’s name, BCIN number and signature must appear on every page of every document — not just the cover. Contractor-prepared drawings without a registered designer behind them fail here.
50–60 BTU per square foot is not a CSA F280 calculation, and reviewers know the difference on sight. The OBC requires the room-by-room methodology — it’s the law, not a preference.
Heat loss without the duct design, or equipment capacity that doesn’t match the calculated load at design temperature. The package must hang together as one consistent story.
Upload the deficiency notice and your floor plans. Within hours we tell you exactly which items are mechanical, what caused them, and a firm price to fix them — free, no obligation.
Corrected CSA F280 at the right design temperature, MVDS, Schedule 1, drawings — every page BCIN-stamped, formatted for your municipality’s portal (Cloudpermit, APLI and the rest). 48 hours.
Deficiency responses typically re-enter review faster than new applications. If the reviewer has follow-up questions about our documents, we answer them — that’s part of the service.
No — and the difference matters for your stress level. A deficiency notice is a request for corrections; your application stays alive. You fix the listed items and resubmit. A true refusal is rare and comes with appeal rights under the Building Code Act.
Almost always 48 hours from the moment we have your deficiency notice and floor plans. Wrong design temperature, missing MVDS and Schedule 1 issues are same-package fixes. The clock that matters is usually your builder’s schedule, not ours.
Yes — this is the most common scenario we see. The contractor is often excellent at installation and simply isn’t a BCIN-registered designer. We produce the compliant design documents; your contractor keeps the installation.
Our packages are formatted to what Ontario building departments actually check — correct SB-1 design temperature, full F280 methodology, MVDS, signed Schedule 1, BCIN on every page. If a reviewer raises a question about a document we produced, we resolve it as part of the job.
The permit clock is running. Free deficiency review within hours — corrected, stamped documents in 48.
Fix My Permit →Upload the deficiency notice and your floor plans. We identify every mechanical item, quote the fix free within hours, and deliver corrected BCIN-stamped documents in 48 — CSA F280 at your municipality’s design temperature, MVDS, Schedule 1, drawings, every page stamped.