Plat Simionati
Wellington County (Guelph)
One of 53 law firms listed in Guelph, and one of 23 handling Family Law.
About Plat Simionati
Plat Simionati LLP is a family law firm in Guelph, Ontario. It opened in 2022, when Sean Plat and Taryn Simionati, who had both been partners at Miller Thomson LLP, set up their own practice and gave it the two founders' surnames. Family law is the whole of what the firm does. Its lawyers handle domestic contracts, divorce and separation, division of marital property, spousal and child support, parenting time, and decision-making responsibility, and between them the founding partners bring more than 39 years of combined experience to that work.
The firm resolves matters in more than one way. Depending on what a file needs, it works through negotiation, mediation, collaborative family law, arbitration, or litigation, and its lawyers have appeared at every level of court in Ontario. Founding partner Sean Plat was born and raised in Guelph, studied at the University of Guelph and Queen's University, and has offered collaborative family law since 2003. The firm has been listed in The Best Lawyers in Canada since 2024. Its work runs to complex property and income questions, high-conflict parenting, and clients with substantial assets, and it draws files from Guelph, the Waterloo Region, Halton and Hamilton, and the wider Toronto area.
Practice areas
Milestones & recognition
- Founded in 2022 by Sean Plat and Taryn Simionati, who had both been partners at Miller Thomson LLP.
- Sean Plat was called to the Ontario bar in 1997 and Taryn Simionati in 2011, and together the founding partners bring more than 39 years of combined family law experience.
- A founding partner has practised collaborative family law since 2003 and holds a Collaborative Practice Level II certificate.
- The firm has been listed in The Best Lawyers in Canada since 2024.
In the community
- The firm publishes a family law blog with plain-language articles on child support, separation and divorce, mediation, and domestic contracts.
Good to know
Wheelchair accessible
By appointmentLawyers
No individual lawyers listed on the firm site.
The neighbourhood
The office sits in a piece of Guelph's stone-building history. 258 Woolwich Street is a two-storey limestone dwelling put up in 1871 and 1872 for Samuel Hodgskin, an accountant, with a brick addition added at the rear a few years later. The City of Guelph designated the property under a 1983 heritage bylaw, and the city's record lists it as one of a series of three stone houses of varied styles between Charles Street and Edwin Street.
Woolwich Street marks the eastern edge of Guelph's downtown, near where the Speed and Eramosa rivers meet, so the office is a short distance from the shops and services of the core. Guelph is a mid-sized city west of Toronto, known for its limestone architecture and as the home of the University of Guelph, and the firm's roots in the city run deep.
Frequently asked questions
- Does Plat Simionati handle divorce and separation in Guelph?
- Yes. The Guelph firm practises family law only, and it works on divorce and separation, division of marital property, spousal and child support, parenting time, and decision-making responsibility.
- Can the firm help me resolve things without going to court?
- Yes. The firm settles many matters through negotiation, mediation, collaborative family law, and arbitration, and it turns to litigation when a case cannot be resolved another way.
- Can Plat Simionati prepare a marriage contract or cohabitation agreement?
- Yes. The firm drafts domestic contracts, including marriage contracts and cohabitation agreements, as well as separation agreements.
- Does the firm take complex or high net worth family cases?
- Yes. Its lawyers work on complex property, income, and support questions, high-conflict parenting matters, and clients with substantial assets.
- Where is the firm and what areas does it serve?
- The office is at 258 Woolwich Street in Guelph. The firm draws family law clients from Guelph, the Waterloo Region and Kitchener, Halton and Hamilton, and the wider Toronto area.
- How long has Plat Simionati been in practice?
- Plat Simionati LLP opened in 2022. Its two founders had previously been partners at Miller Thomson LLP, and together they bring more than 39 years of family law experience.
Where to find them
258 Woolwich Street Guelph, Ontario N1H 3W1 · 519-780-4638
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Civil Litigation & Dispute ResolutionListing compiled from the firm’s public website in August 2026. Verify licence status in the Law Society of Ontario directory ↗