7 Most Common Denver Home Inspection Red Flags (And How to Handle Them)
Each home has a story. Whether they’ve just been built or have stood tall for generations, every property has a distinct mechanical and structural footprint.
When you receive a home inspection report, seeing a list of flagged items can feel overwhelming. However, home inspection is not a pass-fail test. No property is perfect. The key is knowing which findings need immediate attention, which are routine maintenance, and which environmental factors can affect the property’s performance over time.
Whether you’re selling, buying, or just checking your house’s integrity, 360 Blackstone Home Inspections can give you peace of mind. Here are the 7 most common home inspection issues we’ve encountered across the west Denver area, along with practical context on what they mean for property owners and buyers.
Soil Movement and Foundation Conditions
One of the most notable geological characteristics of the Denver basin is the presence of expansive soil, primarily containing bentonite clay. According to geological assessments from the Colorado Geological Survey, these soils swell significantly when absorbing moisture and shrink when drying out.
This continuous expansion and contraction puts immense pressure on concrete foundations and basement slabs.
During a home inspection, inspectors look for symptoms of soil movement, which include:
Hairline or step-pattern cracks in poured concrete or block foundation walls.
Drywall stress cracks, particularly around door frames and window corners.
Doors and windows that stick or fail to latch due to subtle frame shifts.
Minor cracks can be a harmless result of initial concrete curing, but larger structural cracks or horizontal bowing are much more serious. Managing surface drainage away from the home is often the first and most effective defense against soil-related movement.
Roof Wear and Storm Impact
Denver averages over 300 days of sunshine each year and sits at an elevation of 5,280 feet. High altitude means thinner atmosphere and stronger UV radiation, which can cause premature aging in asphalt roof shingles. However, your shingles have bigger problems than a little sunshine. Colorado’s Front Range sits in the heart of "Hail Alley," where spring and summer storms frequently drop damaging hail.
Here’s what we look for during a roof inspection:
Granule Loss: UV rays break down the asphalt binding, causing protective surface granules to wash into gutters.
Impact Bruising: Hail impacts fracture the underlying fiberglass beneath the shingle, leading to premature leaks.
Flashing Integrity: Damaged or improperly sealed flashing around chimneys, skylights, and plumbing vents.
As any homeowner can tell you, roof repairs can get expensive. A roof assessment gives you the data you need to make an informed decision before any significant investment.
Outdated or Altered Electrical Systems
As modern power demands surge, electrical standards have evolved right along with them. In older Denver neighborhoods such as Highlands, Capitol Hill, or Park Hill, homes built before the 1970s often feature original wiring configurations or unguided additions.
Here are the most common electrical issues we find in older homes:
Ungrounded Outlets: Standard two-slot outlets or three-prong outlets installed without an established ground path.
Overcrowded or Outdated Panels: Electrical panels manufactured by companies with documented safety concerns (such as Federal Pacific Electric or Zinsco) or panels without enough amperage to handle modern appliance loads.
Unjunctioned Wiring Connections: Exposed electrical wire connections that should be covered—most often found in attics and basements.
When it comes to electricity, safety is the number one concern. A good home inspector will flag these issues so a licensed electrician can bring a house’s circuits up to standard.
Heating and Ventilation Systems
Anyone who’s survived a Rocky Mountain winter can tell you that a reliable heating system is essential. Forced-air furnaces are the predominant heating source in Denver homes, but they can present unique dangers if they aren’t regularly maintained.
Expansion and contraction form stress fractures in a system’s heat exchangers over time. According to safety guidance from the U.S. Consumer Product Safety Commission (CPSC), cracked heat exchangers in forced-air furnaces could cause carbon monoxide to leak into the home. In our heating and ventilation inspections, we verify that the heating system is clear and safe to use.
Grading and Surface Water Management
Proper water management around the exterior perimeter keeps a house’s foundation stable and its basement dry. In ideal conditions, the ground surface should slope away from the foundation at a grade of at least 6 inches within the first 10 feet, as recommended by standard building practices.
Inspection findings frequently highlight:
Negative Grading: Soil sloping toward the home, directing rain and snow melt straight to the foundation walls.
Short Downspout Extensions: Gutter downspouts discharging water within 1 to 2 feet of the home rather than carrying it 5+ feet away.
Clogged or Damaged Gutters: Water overflowing the eve trim and pooling at the base of the structure.
Save yourself from significant water intrusion issues down the line by addressing these straightforward, low-cost exterior improvements.
Undetected Plumbing Leaks and Aging Pipe Materials
Plumbing issues range from simple cosmetic fixes to concealed leaks that compromise subfloors. In older properties, inspectors frequently encounter original galvanized steel supply lines, which corrode internally over decades, severely restricting water pressure.
Plumbing issues range from simple cosmetic fixes to advanced, concealed leaks that compromise a home’s subfloor, but what an inspector looks for can vary depending on when the home was built.
For example, in older properties, inspectors frequently encounter original galvanized steel supply lines. Over decades this steel corrodes internally and severely restricts water pressure.
In homes built between the late 1970s and mid-1990s, however, inspectors look for polybutylene supply piping. These gray plastic pipes don’t have the same corrosion concerns as galvanized steel pipes, but they are more susceptible to the chlorine added to our water. Today we’re seeing these polybutylene pipes suffer sudden joint failures due to chlorine degradation.
Identifying piping materials allows buyers to budget appropriately for future plumbing upgrades.
Radon Levels in Colorado Homes
Radon is an odorless, naturally occurring radioactive gas formed by the decay of uranium in soil and rock. According to the Environmental Protection Agency (EPA), Colorado is designated as a Zone 1 area, meaning counties across the state have a high potential for elevated indoor radon levels above the recommended action level of 4.0 pCi/L.
Radon enters homes through foundation cracks, sump basins, and floor drains, and radon levels cannot be predicted based on house age or structural type.
If you think a radioactive, indetectable gas that sneaks into your house through invisible cracks and floor drains sounds scary, think again. Radon testing is easy, fast, and provides incredible peace of mind when you’re looking to buy, sell, or just want to perform a safety check on your home. By measuring the gas levels in your home for just 24 hours, we can provide clear and actionable data. If levels are elevated, active soil depressurization (radon mitigation) systems are straightforward to install and highly effective at drawing gas safely away from the living environment.
Reading Your Report with Perspective
An inspection report (example here) serves as an educational user manual for your property. Here’s what to do when reviewing the findings:
Distinguish Safety Concerns from Maintenance: Focus first on structural integrity, environmental safety, electrical hazards, and active water leaks.
Plan Future Maintenance: Use lower-priority findings (such as older water heaters or minor caulking gaps) to create a multi-year homeowner maintenance checklist.
Communicate Clearly: Work closely with your real estate professional to review the objective data and determine reasonable next steps.
Schedule Your Inspection with 360 Blackstone Inspections
Whether you are under contract on a home, preparing to list your property, or evaluating a new build, having detailed, objective information gives you complete confidence in your real estate decisions.
At 360 Blackstone Inspections, we deliver clear, thorough, and professional property evaluations across the entire Denver metropolitan area. Contact us today to discuss your property or schedule your upcoming home inspection.
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