Sarnia: questions buyers ask about the records
Each page names the public record that answers one question, where to read it yourself, and which OfferDue check reads it. What the records show, never advice.
Sources checked October 29, 2026
Sarnia at a glance
The town's local rules as pictures, from our hand-kept tables of its by-laws and pages and from its flood page. Each tile opens the page with the full wording, its source and the date we checked it.
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Property tax
1.80% of assessed value, 2026 residential rate
Read the question →0%2.32% (Chatham-Kent)16th highest of 61 towns. Lowest: Markham, 0.72%.
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Extra units
Up to 2 homes on a lot
Read the question → -
Short-term rentals
- A licence, permit or registration is needed
- Only a home someone lives in
- Up to 180 a year
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A business run from home
- Up to 25%of the floor area
- 1 from outsidemay work there
How can I find recorded pits, quarries and petroleum wells near a Sarnia home?
Two provincial records: the Find Pits and Quarries map of licensed and permitted aggregate sites, and the petroleum wells dataset of wells drilled for oil, gas, salt or underground storage.
In the free check and the full report.
How can I find mapped railways, power lines and pipelines near a Sarnia home?
The Ontario Railway Network and the Ontario Utility Line dataset: provincial mapping of tracks and crossings, and of power lines, pipelines and other utility lines.
In the free check and the full report.
What records explain additional dwelling units at a Sarnia home?
Section 3.10(4) of the City's Zoning By-law 85 of 2002, as posted on its zoning by-law page, the City's additional dwelling units page, and the City's notices on the new comprehensive zoning by-law.
In the free check and the full report.
What public rules cover short-term rentals in Sarnia?
The City's Short-Term Accommodation By-law 15 of 2020, section 3.41 of Zoning By-law 85 of 2002 and its Municipal Accommodation Tax By-law, as summarised on its short-term accommodation pages.
In the free check and the full report.
What is Sarnia's residential property tax rate for 2026?
The City's tax rates page, which lists the total 2026 rate for each property class.
In the free check and the full report.
Is a Sarnia address in a regulated flood area, and whose map says so?
The St. Clair Region Conservation Authority's online mapping tool, permits and property inquiry pages, under Ontario Regulation 41/24.
Public source; flood plain and regulated-area checks not included in OfferDue reports.
Who helps with a home in Sarnia
Every kind of business a home needs, by moment, and the local rules their work runs into, each with its source and the date it was checked.
Public-record information, not legal, financial, insurance or inspection advice. Records change and can be incomplete, and these pages describe the records, not any particular home. What we cover, city by city.