Most home inspection reports in Milwaukee and Waukesha County come back with a list of findings, and that's normal. No house is perfect, including new construction. What matters is knowing which defects are minor maintenance, which are worth negotiating, and which need a specialist before you close.
This checklist covers 25 defects that come up again and again in Southeast Wisconsin homes, grouped by system. Our freeze-thaw winters, older housing stock, and full basements shape this list. For each item, you'll find the red flag to look for and what usually comes next.
Exterior and grading
1. Grading that slopes toward the foundation
Red flag: soil, patios, or walkways that pitch toward the house instead of away from it. Water that drains toward the foundation is one of the most common causes of wet basements in the area. Regrading is usually a modest fix compared with the damage it prevents.
2. Downspouts that dump water at the foundation
Red flag: short or missing downspout extensions, or splash blocks that have shifted. Extending downspouts several feet from the house is one of the cheapest water fixes a homeowner can make.
3. Clogged, sagging, or leaking gutters
Red flag: overflow stains on siding, sagging sections, or gutters full of debris. In Wisconsin winters, poor drainage and attic heat loss together can lead to ice dams at the roof edge.
4. Wood rot on trim, sills, and siding
Red flag: soft or crumbling wood at window sills, door thresholds, fascia, and the bottoms of siding boards. Rot is usually local and repairable, but it points to water getting where it shouldn't.
5. Settled steps, walks, and driveways
Red flag: heaved or sunken concrete, trip hazards at entry steps, or slabs that now slope toward the house. Freeze-thaw cycles move concrete every year in Southeast Wisconsin.
Roof and chimney
6. Shingles near the end of their life
Red flag: curling, cupping, missing granules, or bald spots. An aging roof isn't a defect by itself, but it is a cost to plan for. Our life expectancy chart shows typical lifespans for roofs and other major components.
7. Failed or missing flashing
Red flag: gaps, rust, or heavy caulk around chimneys, skylights, valleys, and roof-to-wall joints. Flashing failures are a leading source of roof leaks and often show up as ceiling stains inside.
8. Deteriorated chimney masonry
Red flag: cracked chimney crowns, loose or missing mortar, and spalling brick. Water and freeze-thaw cycles break down masonry over time. A chimney specialist should evaluate the flue if the inspector notes concerns.
Foundation and basement
9. Foundation cracks
Red flag: horizontal cracks, stair-step cracks in block walls, or cracks wider at one end than the other. Thin vertical shrinkage cracks are common and often minor. Horizontal or widening cracks deserve a closer look by a structural professional.
10. Bowing or leaning basement walls
Red flag: a block or poured wall that bulges inward, often with a horizontal crack. Soil and water pressure against basement walls is a common Wisconsin issue. Repairs range from wall anchors to bracing, so get an evaluation and estimate before closing.
11. Signs of water in the basement
Red flag: white mineral deposits (efflorescence) on walls, water stains, musty odors, rusted appliance bases, or fresh paint on just the lower walls. Our thermal imaging can help find moisture that isn't visible to the eye.
12. Sump pump problems
Red flag: a pump that doesn't run when tested, no check valve, a discharge line that empties right next to the house, or no lid on the pit. A failed sump pump during a spring thaw can flood a finished basement fast.
Attic and structure
13. Poor attic ventilation and insulation
Red flag: frost or dark staining on the underside of the roof deck in winter, thin or uneven insulation, or blocked soffit vents. Warm, moist air escaping into a cold attic is a common cause of ice dams and attic mold in Wisconsin.
14. Bathroom fans vented into the attic
Red flag: an exhaust duct that ends in the attic instead of running outside. Every shower then sends moisture into the attic, where it can condense on cold surfaces.
Plumbing and sewer
15. Aging galvanized supply pipes
Red flag: gray threaded steel pipes, low water pressure, or rust-colored water. Galvanized pipe corrodes from the inside over decades, and replacement is a common project in older Milwaukee homes.
16. Problems in the sewer lateral
Red flag: slow drains throughout the house, gurgling, or a history of backups. Many older homes have clay or cast-iron sewer laterals that can crack, sag, or fill with tree roots. A standard inspection can't see inside the line, but a sewer scope inspection can.
17. Water heater issues
Red flag: rust at the base, a missing or improperly piped relief valve discharge tube, backdrafting at the vent, or a tank well past its expected life.
18. Active leaks under sinks and around fixtures
Red flag: damp cabinet floors, staining below toilets and tubs, or corroded shutoff valves. These are usually simple repairs, but long-term leaks can hide rot and mold.
Electrical
19. Panel defects
Red flag: double-tapped breakers, missing knockouts, scorch marks, or breakers sized wrong for the wire. These need a licensed electrician.
20. Ungrounded outlets and older wiring
Red flag: two-prong outlets, three-prong outlets that test ungrounded, or knob-and-tube wiring in older homes. Some insurers ask about older wiring types, so it's worth knowing before you close.
21. Missing GFCI protection
Red flag: standard outlets near sinks, in bathrooms, garages, basements, and outdoors. Adding GFCI protection is an inexpensive safety upgrade.
22. Amateur wiring
Red flag: open splices without junction boxes, extension cords used as permanent wiring, or loose wires in basements and attics. DIY electrical work is one of the most common findings in homes that have been updated over time.
Heating, safety, and interior
23. A furnace near the end of its life
Red flag: an older unit with rust, soot, or an unusual flame pattern, or no service records. An HVAC technician should evaluate any furnace the inspector flags, especially before a Wisconsin winter.
24. Missing smoke or carbon monoxide alarms
Red flag: no working alarms on each level. Wisconsin law requires carbon monoxide alarms in the basement and on each floor level of homes that have a fuel-burning appliance, an attached garage, or a fireplace. Smoke alarms are required too. This is an easy fix with a big safety payoff.
25. Signs of moisture and possible mold
Red flag: visible growth, musty odors, peeling paint, or staining in basements, attics, and bathrooms. An inspector notes conditions that support mold growth. Confirming what's present takes mold inspection and sampling.
What a standard inspection won't find without testing
Some of the most important issues in Southeast Wisconsin homes can't be confirmed by looking. These need a test or a specialized inspection, and in Wisconsin, testing generally has to be written into your offer to purchase:
- Radon: invisible and odorless, and only a test tells you the level. See radon testing.
- Wood-destroying insects: termites and carpenter ants can hide in framing. See WDO inspections.
- Asbestos: common in older pipe insulation, floor tile, and textured ceilings. See asbestos testing.
- Lead paint: likely in homes built before 1978. See our guide on whether a lead paint test is necessary.
For more on where a standard inspection stops, read what home inspectors are not allowed to do.
Frequently asked questions
Is it normal for a home inspection report to have a lot of findings?
Yes. A thorough report on an older home often lists dozens of items, and most are maintenance or minor repairs. Focus on safety issues, water problems, and major systems near the end of their life.
Which defects are worth negotiating over?
Buyers usually focus on structural concerns, active water intrusion, roof problems, electrical hazards, and major systems that need replacement. Cosmetic items and routine maintenance are rarely worth renegotiating. Your agent can help you decide what to ask for.
Should sellers fix these before listing?
A pre-listing inspection shows sellers what a buyer's inspector will find, so they can fix, disclose, or price for issues ahead of time and avoid surprises after an offer.
Book a home inspection in Milwaukee or Waukesha County
Whether you're buying or selling, a full home inspection from Homesight covers every system on this list, with a next-day report, a second-level review, and our 200% Satisfaction Guarantee. Use our buyer's guide to prepare, then book online or call (414) 321-1070.