My new build basement in auburn bay has minor concrete cracks after one winter is that normal?

Minor concrete cracks in a new basement after one winter are very common in Calgary, especially in Auburn Bay where expansive clay soils and extreme freeze-thaw cycles put significant stress on foundations. Most hairline cracks under 1/8 inch wide are considered normal settling and don't indicate structural problems.

What's Normal vs. Concerning
Hairline cracks (less than 1/8 inch wide) that run vertically or at slight angles are typically normal settling cracks. Calgary's expansive clay soils - particularly prevalent in southeast communities like Auburn Bay - cause foundations to shift slightly as the soil adjusts to moisture changes and frost cycles. Your new foundation is also curing and settling into its final position during the first year.

However, you should monitor these cracks closely. Take photos and measure their width and length now to track any changes. Concerning signs include cracks wider than 1/4 inch, horizontal cracks, stair-step patterns, or cracks that continue growing over time. Water seepage through cracks is also a red flag that needs immediate attention.

Auburn Bay Soil Conditions
Auburn Bay sits on some of Calgary's most challenging soil conditions - highly expansive bentonite clay that swells dramatically when wet and shrinks when dry. This creates ongoing pressure on foundations that can cause minor cracking even in properly built homes. The extreme chinook temperature swings Calgary experienced this past winter (going from -30°C to +15°C in 24 hours) compound this stress through rapid freeze-thaw cycling.

Your New Home Warranty Coverage
Since this is a new build, you're covered under Alberta's New Home Buyer Protection Act through your builder's warranty provider (likely Alberta New Home Warranty Program, National Home Warranty, Progressive Home Warranty, or WBI Home Warranty). Foundation defects are covered for 10 years for major structural issues and 2 years for water penetration problems. Minor cosmetic cracks may not be covered, but any crack allowing water infiltration or indicating structural movement should be reported to your builder and warranty provider immediately.

Next Steps
Document the cracks with photos and measurements now, then check them again in 3-6 months. Contact your builder to report the cracks - they should assess whether this is normal settling or requires repair. If the builder dismisses your concerns but cracks continue growing or allow water entry, contact your warranty provider directly. For peace of mind, consider having a structural engineer assess the cracks if they exceed 1/4 inch or show signs of ongoing movement.

Most Auburn Bay homeowners see some minor foundation settling in the first 1-2 years, but proper monitoring ensures any real problems get caught early while still under warranty.