Guide · Calgary new builds
Common New Build Deficiencies in Calgary
The most frequently missed construction defects we see in Calgary new builds - and what they could cost you if not caught early.
Why This Guide Matters
These aren't theoretical problems. We see these deficiencies regularly in Calgary new builds, including from well-regarded builders. Even a $800,000 home can have $10,000+ in defects if you don't know what to look for. Catching these issues before possession is when you have the most leverage -- and it can save you thousands in repairs down the road.
Understanding Deficiency Severity
Not all deficiencies are equal. We categorize them by potential impact to help you prioritize what needs immediate attention versus what can wait for the warranty walkthrough:
Complete Deficiency Guide
HVAC Ducting Touching Subfloor
MAJORHeating and cooling ducts installed in contact with the subfloor above, causing squeaking, popping noises, and potential damage when the floor flexes under foot traffic. This is one of those issues that seems minor until you're living with it every day.
How to Spot It
- •Walk on floors above the basement and listen for metallic popping or squeaking sounds
- •Visually inspect the basement ceiling where ducts run close to the subfloor
- •Check for ducts that appear compressed or bent against floor joists
- •Look for missing hangers or supports, especially on longer duct runs
Why It Matters
Beyond the annoying noise, ducts resting against the subfloor can get damaged over time as the floor flexes, leading to air leaks, reduced heating efficiency, and repairs that require cutting open the ceiling. This one tends to show up in winter when the system is running constantly and materials are contracting in the cold.
$500 - $2,500 depending on accessibility and extent
Typically covered under Year 1 workmanship warranty if documented before possession
Unsealed Roof Caps and Vents
CRITICALRoof penetrations like plumbing stacks, exhaust vents, and gas vents that aren't properly sealed around the base or have damaged or missing flashing. Builders are often rushing to close up roofs before weather hits, and this is where shortcuts happen.
How to Spot It
- •Request photos from the builder or hire an inspector with a drone
- •Check the attic for any daylight visible around penetrations
- •Look for water stains on the ceiling near vent locations
- •After rain, check the attic for any signs of moisture around penetrations
Why It Matters
Unsealed roof penetrations are one of the most common sources of water getting into your home. The damage can go unnoticed for months while mold, rot, and structural issues develop behind the scenes. Calgary's constant freeze-thaw cycles turn even small gaps into big problems fast.
$200 - $800 per penetration; water damage repair $2,000 - $15,000+
Covered under building envelope warranty (Years 1-5) but damage from delayed reporting may be excluded
Leaking Whirlybird Vents
MAJORTurbine-style roof vents (whirlybirds) that allow water in through poor base sealing, worn bearings, or improper installation. These are a known weak point on Calgary homes and many experienced inspectors recommend replacing them with static vents altogether.
How to Spot It
- •Check the attic directly below the whirlybird for moisture or staining
- •Spin the whirlybird from the attic side -- it should rotate freely without grinding
- •Look for rust streaks on roof shingles below the vent
- •After heavy rain or snow melt, inspect the attic for any signs of dripping
Why It Matters
Whirlybirds are notorious for leaking in Calgary's climate. The spinning mechanism wears over time and lets rain in, or the base flashing fails. By the time you see water stains on your ceiling, the damage to insulation, drywall, and framing can already be extensive.
$150 - $400 to replace; water damage repair $1,000 - $10,000+
Covered under building envelope warranty; however, whirlybirds are often better replaced with static vents
Improperly Sloped Gutters
MAJORGutters that are level, slope the wrong way, or have low spots that collect standing water instead of draining toward the downspouts. It sounds simple, but this is one of the most common installation errors we see.
How to Spot It
- •After rain, check gutters for standing water -- they should drain within a couple hours
- •Run water from a garden hose and watch whether it flows toward the downspouts
- •Look for sagging sections or visible dips along the gutter run
- •Check for staining or algae growth in gutters, which indicates standing water
Why It Matters
Standing water in gutters leads to ice dams in winter, accelerated corrosion, overflow that damages fascia boards and your foundation, and premature gutter failure. Gutters need a consistent slope toward the downspouts -- even a slight dip in the wrong spot creates pooling.
$200 - $600 to re-hang and slope; ice dam damage repair $1,000 - $5,000+
Covered under Year 1 workmanship warranty if documented
Insufficient Stucco Thickness
CRITICALStucco applied thinner than it should be, often visible where the mesh pattern shows through the surface or where the texture looks inconsistent. This tends to happen around windows and corners where application is trickier.
How to Spot It
- •Look for mesh pattern visible through the stucco surface
- •Check areas around windows and corners where application is often thinner
- •Look for hairline cracks appearing soon after completion
- •Compare the texture at edges and around trim to the center of walls
Why It Matters
Thin stucco cracks easily, and Calgary's freeze-thaw climate is brutal on exterior finishes. Once cracks form, moisture gets behind the stucco and damages the substrate, leading to mold and structural issues. Proper thickness gives your exterior the impact resistance and weather protection it needs to last.
$50 - $150 per square foot for proper repair; full replacement $15,000 - $40,000+
Covered under building envelope warranty (Years 1-5); cosmetic cracking may be disputed
Inadequate Attic Insulation
CRITICALAttic insulation that falls short of code requirements, has gaps around penetrations, or has been compressed or disturbed during construction. Trades working in the attic after insulation is installed are a common culprit.
How to Spot It
- •Check insulation depth with a ruler -- it should be deep and consistent across the entire attic
- •Check for gaps around electrical boxes, pipes, and HVAC penetrations
- •Look for compressed or disturbed areas from storage or HVAC equipment
- •Make sure baffles are in place to keep soffit vents clear
Why It Matters
Calgary's winters are no joke, and proper insulation is one of the most important things protecting your comfort and energy bills. Insufficient insulation leads to high heating costs, ice dams, frozen pipes, and uncomfortable cold spots. It's also one of the easiest deficiencies to overlook because it's out of sight.
$1,500 - $3,500 for proper insulation; ice dam repairs $500 - $5,000
Covered under Year 1 if below code requirements; may require energy audit to prove deficiency
Bathroom Exhaust Venting to Attic
CRITICALBathroom exhaust fans that terminate inside the attic rather than venting to the exterior, pumping warm moist air directly into the attic space. This is a code violation, and it happens more often than you'd think.
How to Spot It
- •Check the attic for flexible exhaust ducts that end without an exterior termination
- •Look for moisture, frost, or mold on attic sheathing near bathroom locations
- •Verify each bathroom has a corresponding roof or soffit vent termination outside
- •Check for frost buildup in the attic during winter months
Why It Matters
All that steam from your showers is being pumped straight into the attic. In Calgary winters, this moisture freezes on the roof sheathing and then causes catastrophic damage during spring thaw -- think mold, wood rot, and insulation damage all at once. This is one of the more serious deficiencies we see.
$300 - $800 to properly vent; mold remediation $2,000 - $20,000+
Building code violation - should be corrected regardless of warranty; covered under Year 1
Foundation Grading Toward House
CRITICALExterior grade that slopes toward the foundation instead of away from it, directing surface water right against the foundation walls. Especially common after final grading settles during the first year.
How to Spot It
- •Place a ball near the foundation and see which way it rolls -- it should roll away from the house
- •After rain, observe where water collects and which direction it flows
- •Check for erosion patterns or soil settling near the foundation
- •Look for water stains or white mineral deposits on foundation walls inside
Why It Matters
Improper grading is the number one cause of basement water problems. Water pooling against the foundation creates pressure on the walls, causes cracks and leaks, and leads to eventual structural damage. Calgary's heavy clay soil makes this worse because it holds water instead of draining it away.
$500 - $2,000 for re-grading; foundation water damage repair $5,000 - $50,000+
Covered under Year 1 for installation defects; builder may claim settling is normal
Missing or Inadequate Window Flashing
MAJORWindows installed without proper flashing tape and drip caps that should direct water away from the window frame and wall cavity. When builders rely on caulking alone, it's only a matter of time before water finds its way in.
How to Spot It
- •Look for staining below window sills on the exterior
- •Check interior window frames for moisture or soft spots
- •Inspect caulking around windows -- gaps suggest the builder relied on caulk alone
- •During rain, watch for water intrusion at window corners
Why It Matters
Windows are major water entry points. Proper flashing creates a drainage plane that moves water away from the wall cavity. Caulk alone fails within a few years, and by then water has been quietly damaging framing, insulation, and drywall inside the wall where you can't see it.
$200 - $500 per window to re-flash; hidden water damage $2,000 - $15,000+
Covered under building envelope warranty (Years 1-5); early detection critical
GFCI Outlets Missing or Non-Functional
CRITICALGround Fault Circuit Interrupter outlets missing from required wet locations (bathrooms, kitchen counters, garage, exterior) or installed but not functioning properly. This is a life-safety issue, not just a quality concern.
How to Spot It
- •Check bathrooms, kitchen counter, garage, and exterior outlets for GFCI test/reset buttons
- •Press the TEST button -- power should cut off; press RESET to restore
- •If no GFCI is visible at the outlet, check the electrical panel for a GFCI breaker on that circuit
- •Pick up an inexpensive GFCI tester from the hardware store for easy verification
Why It Matters
GFCIs prevent electrocution by instantly cutting power when they detect current leakage. Their absence in wet locations is a serious safety hazard and a code violation. This isn't about property damage -- it's about protecting your family.
$100 - $200 per outlet; already low cost is not the point -- this is safety
Code violation - must be corrected; covered under Year 1 workmanship
Dryer Vent Improper Installation
CRITICALDryer exhaust vents that are excessively long, have too many bends, use improper materials like vinyl or foil flex duct, or don't terminate properly outside. A fire hazard that's easy to miss because the vent is mostly hidden inside walls.
How to Spot It
- •Check the exterior termination point -- it should have a damper that opens when the dryer runs
- •Look for crushed or kinked flex duct behind the dryer
- •Check that rigid metal duct is used for any concealed runs through walls or ceilings
- •Verify the total vent length is reasonable -- excessively long runs with many bends restrict airflow
Why It Matters
Improper dryer venting causes lint accumulation, which is one of the leading causes of house fires. It also makes your dryer work harder, increases energy costs, and can cause moisture problems if the vent doesn't actually make it outside.
$150 - $400 for proper venting; fire damage = total loss potential
Code violation if vented indoors; covered under Year 1 workmanship
Dishwasher Drain Loop Missing
MAJORDishwasher drain hose connected directly to the disposal or drain pipe without a high loop or air gap, allowing contaminated water to backflow into the dishwasher. A quick fix, but a gross problem if left unaddressed.
How to Spot It
- •Look under the sink -- the drain hose should loop up near the underside of the counter before going down to the drain
- •Or check for an air gap device at the sink deck (less common in residential homes)
- •If the hose runs straight from the dishwasher to the drain or disposal, it's incorrect
Why It Matters
Without a high loop, dirty water from the garbage disposal or drain can siphon back into the dishwasher, contaminating your clean dishes. It's a health hazard and a code violation, but fortunately it's one of the cheapest fixes on this list.
$50 - $150 easy fix; health consequences are the real concern
Code violation - must be corrected; covered under Year 1
Nail Pops and Drywall Cracking from Truss Uplift
MODERATENail heads pushing through drywall or cracks appearing where ceilings meet walls, especially on upper floors. This happens when roof trusses shift seasonally due to moisture and temperature changes -- common in Calgary's dry winters.
How to Spot It
- •Look along the ceiling-to-wall junction on upper floors for cracks or separation
- •Check for nail or screw heads pushing through drywall, especially on ceilings
- •Inspect during winter when the issue is most pronounced due to dry conditions
- •Look for recurring cracks that reappear after being patched
Why It Matters
While nail pops and truss uplift cracks are cosmetic rather than structural, they're a sign that framing is moving. In Calgary's climate with extreme temperature swings, some movement is normal, but excessive cracking can indicate improper fastening or truss design issues that should be documented early.
$200 - $600 for drywall repairs; recurring if underlying cause isn't addressed
Covered under Year 1 workmanship; some builders address this at the 11-month warranty walkthrough
Garage-to-House Air Barrier Deficiencies
CRITICALGaps in the air barrier between the garage and the living space, allowing car exhaust, fumes, and cold air to enter your home. This is both a health and comfort issue that's often overlooked during inspections.
How to Spot It
- •Check around the door frame between garage and house for gaps or missing weather stripping
- •Look for unsealed penetrations where wires, pipes, or ducts pass through the shared wall
- •In winter, feel for cold drafts around the garage entry area
- •Check if the attic space above the garage is properly sealed from the house attic
Why It Matters
The air barrier between your garage and living space is a health requirement -- it keeps carbon monoxide and vehicle exhaust out of your home. Gaps also let cold air flood in during winter, making rooms above or beside the garage uncomfortable and driving up heating costs.
$200 - $800 depending on extent of sealing needed
Covered under Year 1; may be a code violation if the barrier is significantly compromised
Rough-In Plumbing Access Issues
MODERATEPlumbing shut-off valves, clean-outs, or access panels that are difficult to reach, improperly installed, or missing entirely. You won't notice this until you have an emergency and need to shut off water quickly.
How to Spot It
- •Locate the main water shut-off and verify it's accessible and functional
- •Check that each toilet and sink has a working shut-off valve
- •Look for access panels to bathtub plumbing -- they should be present and easy to open
- •Test all shut-off valves to make sure they actually turn and stop water flow
Why It Matters
When a pipe bursts or a fixture leaks, you need to shut off water immediately. Inaccessible or non-functional shut-offs mean more water damage while you scramble to find the main valve. Missing access panels mean you might need to cut through walls for routine maintenance down the road.
$100 - $500 per valve or access panel
Covered under Year 1 workmanship if valves are non-functional or access panels are missing
What to Do If You Find Deficiencies
Before Possession
Document everything on the builder's official deficiency form. Get signatures, keep copies, and don't take possession until critical safety issues are resolved. You have the most leverage before you sign final paperwork. Take photos with timestamps and be thorough -- builders are much more responsive before the deal closes.
After Possession (Year 1)
Submit warranty claims in writing immediately upon discovery. Include photos, detailed descriptions, and reference the specific warranty coverage period. Keep copies of all correspondence. Many builders have an 11-month walkthrough process -- use it. Make a list of everything you've noticed and submit it all at once for that final Year 1 review.
If Builder Refuses
Escalate to your warranty provider (ANHWP or private). File a formal complaint with documentation. Consider hiring an independent inspector to document code violations, which strengthens your case significantly. As a last resort, seek legal counsel for significant unresolved issues. Having a REALTOR® who has been through this process can make a real difference in how quickly things get resolved.
Prevention is Better Than Cure
The best time to catch deficiencies is during construction, before drywall goes up and finishes hide problems. Here are the most effective ways to protect yourself:
- 1.Pre-drywall inspection -- Hire an inspector to review framing, HVAC, plumbing, and electrical before it's hidden. This is the single most valuable inspection you can get on a new build.
- 2.Progress visits -- Some builders allow periodic site visits during construction. Even if you're not an expert, photos at each stage create a record you can reference later.
- 3.Professional pre-possession inspection -- Worth the investment for a trained eye on what is likely the largest purchase of your life. A good inspector will catch things you'd never notice.
- 4.REALTOR® representation -- An experienced new-build REALTOR® knows what to look for, understands builder contracts, and can advocate on your behalf when issues arise.
Bottom Line
Every builder makes mistakes -- even the best ones. The difference between a good buying experience and a nightmare often comes down to whether you catch deficiencies early and document them properly.
Use this guide during your walkthrough. Share it with your inspector. Don't let anyone make you feel difficult for being thorough with a purchase this significant. The issues documented here are real, common, and preventable if you know what to look for.
Source note
- Sources
- Jurisdiction
- Alberta, Canada (Calgary and surrounding municipalities)
- Applies to
- New construction homes purchased from a builder in Calgary and the surrounding Alberta municipalities.
- Last reviewed
- 2026-09-03
- Limitations
- General information written for Alberta buyers. It does not describe any specific builder's contract, any specific lot, or your financial situation.
- What you should verify
- The exact wording of your purchase agreement, the builder's current incentive sheet, warranty enrolment for the specific home, and any figure you intend to rely on.
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