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Find a Lawyer » Canada Legal Guides » Ontario Legal Guides » Mississauga Legal Guides » Criminal Defence & Traffic Offences Mississauga » How to appeal a criminal conviction in Mississauga

How to appeal a criminal conviction in Mississauga

23 May 2026 4 min read No comments Criminal Defence & Traffic Offences Mississauga

To appeal a criminal conviction originating in Mississauga, you must file a Notice of Appeal within 30 days of your sentencing. You cannot simply retry the case; you must prove the trial judge made a legal error or delivered an unreasonable verdict.

Being found guilty of a crime at the A. Grenville and William Davis Courthouse in Brampton is a devastating experience. However, a conviction by a trial judge or a jury is not necessarily the end of the road. The Canadian justice system includes an appellate process designed to correct legal mistakes and prevent miscarriages of justice.

Appealing a conviction in Ontario is an incredibly complex legal undertaking. It is not an opportunity to tell your story again or introduce evidence you simply forgot to present at trial. Instead, an appeal focuses strictly on whether the original trial was conducted fairly according to the law. Consulting an appellate lawyer quickly is vital because the legal deadlines are unforgiving. ⏰

Step-by-Step Process for Filing an Appeal

The specific path your appeal takes depends on the type of charge you faced. Appeals for a summary conviction generally go to the Superior Court of Justice, while appeals for a more serious indictable offence must be filed at the Ontario Court of Appeal located at Osgoode Hall in Toronto.

Step 1: Determine the Grounds for Appeal

You cannot appeal just because you dislike the verdict. Your law firm must review the trial and identify specific “grounds” for appeal. Common grounds include the judge misinterpreting a law, improperly admitting illegal evidence (such as a forced confession), or giving incorrect instructions to a jury. 🗣

Step 2: File the Notice of Appeal within 30 Days

In Ontario, you strictly have 30 days from the date of your sentencing to file a Notice of Appeal. Missing this deadline requires applying for a special extension, which is rarely granted without an exceptional excuse. Filing this document officially starts the appellate process.

Step 3: Apply for Bail Pending Appeal

If you were sentenced to jail time, filing an appeal does not automatically pause your sentence. Your lawyer must file a separate application for “Bail Pending Appeal.” You must convince a judge that your appeal has merit, that you will surrender into custody when required, and that releasing you will not harm the public interest. 🔓

Step 4: Order and Review Transcripts

An appeal relies entirely on what happened during the original trial. Your lawyer will order certified transcripts of the trial proceedings, including witness testimonies and the judge’s final ruling. These transcripts are scrutinized line-by-line to build the legal argument (the Factum).

Step 5: Argue Before the Appellate Judges

Months later, your lawyer will present oral arguments before a panel of judges (usually three judges at the Court of Appeal). The Crown Attorney will also argue why the original conviction should stand. You will not testify at this hearing. The judges will then either dismiss the appeal, order a new trial, or, in rare cases, enter an acquittal. 🏭

How Much Does it Cost in Ontario?

Criminal appeals require highly specialized legal knowledge and a massive amount of document review. Consequently, appealing a conviction is a significant financial investment.

Legal ExpenseEstimated Cost in CADNotes
Appellate Lawyer Fees$7,500 – $25,000+Depends heavily on the length of the original trial and complexity.
Trial Transcripts$5 – $8 per pageA multi-day trial can result in $1,500 to $3,000 just for transcripts.
Bail Pending Appeal$2,000 – $5,000A separate application to remain out of jail during the appeal process.

How Long Does the Process Take?

The appellate process requires extreme patience. Once the Notice of Appeal is filed, it takes considerable time for court reporters to prepare the transcripts, for both lawyers to draft their written Factums, and to secure a hearing date.

Generally, a criminal appeal in Ontario takes anywhere from 12 to 24 months from the date of conviction to the day the appellate judges release their final written decision. If the court orders a new trial, that subsequent trial will add even more time to the total process. 📅

Frequently Asked Questions (FAQ)

Can I bring new evidence to my appeal?

Generally, no. Appeals are based on the record of the original trial. Introducing “fresh evidence” is only permitted under very strict rules, such as proving the evidence was completely unavailable during the trial and that it could reasonably have changed the verdict.

What happens if I miss the 30-day deadline?

You must file an Application for an Extension of Time. You will need to explain to the court exactly why you delayed filing and demonstrate that you always intended to appeal within the required timeframe.

Can I appeal the sentence but not the conviction?

Yes. A “Sentence Appeal” argues that the punishment the judge handed down was demonstrably unfit or illegal. For example, if a judge ignored mandatory minimums or gave a sentence far harsher than similar cases in Ontario.

Will the Crown appeal if I am acquitted?

Yes, the Crown Attorney has the right to appeal an acquittal if they believe the trial judge made an error in law that led to your not-guilty verdict. They cannot appeal simply because they disagree with how the judge weighed the facts.

Do I have to attend the appeal hearing in Toronto?

If you are out on bail, you are usually welcome to attend the hearing at Osgoode Hall, but your presence is often not mandatory because you will not be called to testify. Your lawyer will do all the speaking.

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