Building, adding on or dealing with foundation problems in Thunder Bay, ON? Describe your project once and up to three geotechnical engineering firms that work in Thunder Bay get back to you with a quote. Free, no obligation.
Thunder Bay had 108,843 residents at the 2021 Census and is stable (+0.9% since 2016). Whether you are building on a vacant lot or investigating cracks in an existing home, a soils report tells your designer what the ground can carry and how the foundation should be built.
Thunder Bay at a glance
- Population (Census, 2021)
- 108,843 (+0.9% since 2016)
- Rank in Ontario
- 25th of 577 municipalities
- Land area
- 328 km²
- Population density
- 332 people per km² (semi-rural)
- Census division
- Thunder Bay
What to check before hiring in Thunder Bay
- Code requirements: building codes in Ontario, based on the National Building Code of Canada, require foundations suited to the soil; the building department of Thunder Bay can ask for a geotechnical report where soils are weak, expansive (clay), sloping or unknown.
- Licence: a geotechnical report must be sealed by a Professional Engineer (P.Eng.) licensed in Ontario. Ask for the firm's permit to practise.
- Frost and drainage: frost depth and groundwater matter in Canada: a soils report covers them for your foundation design.
- Price drivers: number and depth of boreholes, site access for the drill rig, laboratory testing and the size of the structure.
Useful official resources
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Engineers Canada
Links to the provincial and territorial engineering regulators, to check a P.Eng. licence.
Services available in Thunder Bay
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Soils report for new construction
Borings, lab tests and foundation recommendations for a planned building, often requested by the building department or the structural engineer.
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Foundation problem investigation
Investigation of the soil under an existing building with cracks, settlement or heave, to understand the cause before repairs.
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Compaction and materials testing
Field density (compaction) tests and inspections during site work and foundation construction.
Frequently asked questions in Thunder Bay
Do I need a soils report to build in Thunder Bay?
Often yes for a new home on questionable soils, an addition or any larger building: the building department decides, based on the building code and known soil conditions. A geotechnical engineer can tell you quickly whether your project needs one.
How much does a geotechnical investigation cost?
It depends on the number and depth of boreholes, the lab tests and site access. Describe your project to get quotes from firms that serve Thunder Bay.
My walls or slab are cracking: who should I call?
A geotechnical or structural engineer can investigate the cause (soil movement, settlement, frost, drainage) before any repair. Choose "Foundation problem investigation" in the form.
Who will contact me?
Up to three independent engineering firms that serve Thunder Bay, chosen for the service you need. Your details are shared only with your consent.
Source: Statistics Canada, 2021 Census of Population, table 98-10-0002-01 (Statistics Canada Open Licence), imported on 2026-10-31. Figures describe the census subdivision as published; they are shown for information only.