In Calgary, structural changes such as moving or removing walls on any floor, and new openings in walls, need a City building permit, and engineering may be required. New openings in concrete foundation walls wider than 1.2 m, or totalling over 25% of a wall's length, need a professional engineer's review. Engineers must be licensed by APEGA. Clay soils, frost, chinooks and spring snow shape the common problems.
- Alberta uses the National Building Code – 2023 Alberta Edition for permit applications since May 1, 2024.
- The City lists structural changes, such as moving or removing walls on any floor, as needing a permit.
- Foundation wall openings over 1.2 m wide, or over 25% of a wall's length combined, need an engineer's review.
- Check any engineer in APEGA's public member directory; engineering companies need a Permit to Practice.
- Calgary's clay soils, frost, chinooks and heavy spring snow drive many local structural problems.
01 /Which building code and permits apply in Calgary?
Calgary homes are built and altered under the Alberta edition of the National Building Code. The Government of Alberta lists the National Building Code – 2023 Alberta Edition as the code in force, and the 2023 editions became effective for permit applications on May 1, 2024. The City of Calgary issues building permits and inspects the work.
For houses, the City states that a building permit is needed when a basement is developed for the first time, when you make structural changes such as moving or removing walls on any floor of the house, and when you create new openings in interior or exterior walls, such as new or relocated windows and new doors. The City also says engineering may be required for structural alterations, and gives examples such as a new entrance door in an existing foundation wall or a tall wall, below-ground exterior stairs to an entrance, and above-ground steps supported on brackets.
| Situation in a concrete foundation wall | Engineer's review |
|---|---|
| Width of a new opening exceeds 1.2 m (4 ft 0 in) | Required |
| Combined width of all new and existing openings in one wall exceeds 25% of the wall's overall length | Required |
Structural repairs that do not change walls or openings, such as sistering joists, replacing a post or bracing a foundation wall, are the grey zone; ask the City rather than assume. The general Canadian pattern is covered in structural repair permits.
02 /How do you find a structural engineer in Calgary?
In Alberta, engineers are licensed by APEGA, the Association of Professional Engineers and Geoscientists of Alberta. Anyone calling themselves an engineer must be licensed, and APEGA's public member directory lets you confirm whether an engineer is licensed to practise in Alberta. Companies that practise engineering in Alberta generally need an APEGA Permit to Practice, with a Responsible Member overseeing the work, and are listed in APEGA's permit holder directory.
- Look for residential structural experience
Many Calgary engineering firms focus on commercial work. Ask directly whether they assess houses, design beams and foundation repairs, and do field reviews.
- Verify the licence
Search the engineer in APEGA's member directory and the firm in the permit holder directory.
- Agree the scope
Site visit and letter, report, or design and stamped drawings for a permit, with the fee and turnaround in writing.
- Check authentication
APEGA's practice standard, revised effective November 1, 2024, requires the licensed professional's stamp, APEGA ID, signature and date on authenticated work, plus validation by the firm's Responsible Member.
The same licensing applies across Alberta, including Airdrie, Cochrane, Okotoks, Red Deer and Edmonton; each municipality runs its own permit office and requirements. For what an engineer does and costs, see what a structural engineer does.
03 /How do Calgary soils and frost affect structure?
Much of Calgary sits on clay-rich glacial soils, with gravels in the river valleys and variable fill on redeveloped lots. Clay-rich soils change volume with moisture: they swell when wet and shrink when dry, which can lift or drop slabs and footings seasonally. Wet clay backfill against a basement wall also pushes harder, and freezing water in that soil adds frost pressure. Those mechanisms sit behind many of the horizontal cracks, bowing walls and settled corners seen in Calgary basements.
- Horizontal cracks and bowing: pressure from wet or frozen clay backfill, often worst beside driveways, under downspouts and where snow is piled against the house. See horizontal foundation cracks and bowing basement walls.
- Settlement: poorly compacted fill on some lots, and drying clay near large trees. See foundation settlement.
- Slab heave: basement slabs lifting where clay beneath takes on water, pushing up posts and partitions built tight to the floor above.
- Frost heave: shallow footings, steps, garage slabs and deck piers lifting in winter. The City's uncovered deck checklist asks for deck foundations at least 1.2 m below ground unless an engineer reviews a shallower design; see deck structural problems.
Calgary soils, frost and foundation eras are covered in depth by CalgaryFoundations.ca, and foundation waterproofing and repair pricing in Calgary by CalgaryFoundations.com.
04 /How do chinooks and snow affect Calgary roofs and framing?
Calgary's winters swing between deep cold and chinook thaws, and spring can bring heavy, wet snowfalls. For structure that means three things. First, snow load is about weight, not depth: wet spring snow and snow that has partly melted and refrozen weigh far more than the same depth of fresh powder. Second, repeated freeze-thaw cycles feed ice dams and water into walls and roof edges, the starting point for rot at rafter tails, sills and rim joists. Third, cold dry winters make truss uplift common: ceiling-to-wall gaps that open in winter and close in summer, which are not structural failures.
Design snow loads for Calgary and other locations come from the climatic data used with the building code; the NRC's Design Value Explorer shows climatic design values, including design snow loads, for more than 600 Canadian locations. If a roof starts to sag, crack or pop under a heavy snowfall, keep people out of the rooms below and call for help; see roof sag, trusses and snow load. Attic frost and ice dams in Calgary are covered by CalgaryAtticRain.ca.
05 /What structural problems are common in Calgary's housing eras?
Calgary's housing stock spans more than a century, and each era brings typical structural questions. These are patterns, not rules for any given house; renovations and infills change the picture.
| Era | Common construction | Typical structural questions |
|---|---|---|
| Early 1900s to 1940s inner-city homes | Rubble, brick or early concrete foundations; long joist spans; wood centre beams on posts | Sagging floors, sinking posts, shallow or weak foundations, altered bearing walls |
| Post-war bungalows (1950s–1960s) | Poured concrete basements; central bearing wall on a beam line | Open-concept wall removals, basement developments, sagging centre beams |
| 1970s–1990s suburban homes | Poured concrete; wider trusses; split-levels | Truss alterations in attics, basement openings for egress windows, settlement on fill |
| 2000s onward and infills | Engineered joists and trusses; deeper basements | Cut or notched engineered joists during finishing; excavation next to older neighbours |
Two Calgary-specific situations recur. Basement developments and suites often involve new beams, posts, and larger window openings in foundation walls, where the City's engineering triggers for foundation openings apply. Infill construction next to older houses means deep excavations beside shallow foundations; owners of neighbouring older homes may want an engineer to document existing cracks before work starts. After flooding, such as the June 2013 floods along the Bow and Elbow rivers, affected houses needed assessments for wet framing, scoured soil and damaged foundations; the fire, water and rot guide covers what that involves.
06 /What does structural repair cost in Calgary?
Calgary structural repair costs sit within the national planning ranges on this site, with local factors pushing them up or down: winter excavation and frozen ground, finished basements, access on narrow inner-city lots, and permit and engineering requirements.
| Job | Typical planning range |
|---|---|
| Engineer's site visit and letter | $500–$1,500 |
| Replace a sinking basement post with a new footing | $800–$2,500 |
| Remove a bungalow bearing wall with a dropped beam | $5,000–$12,000 |
| Brace a bowing basement wall | $600–$1,500 per brace |
| Underpin with piers | $2,000–$4,500 per pier |
See the full structural repair cost guide. StructuralRepair.ca is part of HAUSE Home, an independent information and service-request network; it is not a contractor or engineering firm. Send a request with photos and the HAUSE Home desk will reply with next steps and, where available and with your consent, a local engineer or contractor.
FAQQuestions people ask
Do I need a permit to remove a wall in Calgary?
The City of Calgary lists structural changes such as moving or removing walls on any floor of the house as needing a building permit. Confirm your specific project with the Planning Services Centre or 311.
When does Calgary require an engineer for a basement window opening?
Per the City, a professional engineer's review is required when a new opening in a concrete foundation wall is wider than 1.2 m, or when all new and existing openings in one wall total more than 25% of its length.
How do I check a Calgary structural engineer's licence?
Search APEGA's public member directory, which confirms whether an engineer is licensed to practise in Alberta, and the permit holder directory for the firm.
Which building code applies in Calgary?
The National Building Code – 2023 Alberta Edition, which became effective for permit applications on May 1, 2024. The City's plans examiners review applications against the Alberta code.
Why do Calgary basement walls crack horizontally?
Common reasons are wet clay-rich backfill, frost pressure in winter, and loads such as driveways or snow piles near the wall. Keeping water away from the foundation is the first step; bracing may be needed.
Is the ceiling gap in my Calgary house every winter a structural problem?
Usually it is truss uplift, a seasonal arching of roof trusses in cold, dry winters that opens gaps at interior walls. It closes in summer and is managed with drywall clips and trim, not structural repair.