Home inspectors are trained to look, not to smell, but most will note a significant odor because it often points somewhere. A musty basement suggests moisture, so the inspector looks harder at foundation walls, window wells and the sump. A sewer smell sends attention to drains and often to a recommendation for a sewer scope. Smoke odor leads to notes about staining, HVAC condition and possibly a recommendation for cleaning. A sweet, rotten smell in one room raises the possibility of an animal in a wall or attic.
In a typical Colorado transaction, the buyer receives the inspection report during the inspection period and can respond with an objection asking for repairs, a credit or a price change, or can terminate within the contract deadlines. Your agent will know exactly how the current contract forms handle this. The practical point for sellers is that an odor discovered by the buyer arrives with less time to fix it and less negotiating room than one the seller dealt with before listing.
Getting ahead of it before the house lists
Find the source yourself
Use an odor assessment or pre-listing inspection to identify what is causing any smell, rather than waiting for the buyer's inspector to do it.
Fix the cause, not just the smell
Repair leaks, refill or repair drain traps, address crawl space moisture and remove contaminated materials.
Keep records
Save invoices, the written scope, photos before and after, and any test results. These answer questions quickly if they come up.
Recheck under showing conditions
A closed house with the HVAC running is the condition the inspector will see.
Talk with your agent about disclosure
A known past issue that has been corrected may still need to be disclosed. Your agent or an attorney can advise.
What a smell tends to lead an inspector toward
| Odor noticed | Likely follow-up | What helps the seller |
|---|---|---|
| Musty or earthy in the basement | Moisture readings, foundation and window well checks, sump condition | Records of grading, gutter or drainage work and dry conditions |
| Sewer near a drain | Trap and cleanout checks; sewer scope recommendation | Plumber's invoice or a recent sewer scope report |
| Stale smoke | Notes on staining, HVAC filter and duct condition | Cleaning and duct service records; priming details |
| Sweet-rotten in one area | Search for animal entry points in attic, walls or crawl space | Documentation of removal, cleanup and sealed entry points |
| Chemical or fuel-like | Questions about stored products, spills or appliances | Proof the source was removed; gas appliance service if relevant |
Common questions
- Will a buyer's inspector test for mold?
- Some inspectors offer testing as an add-on; many simply recommend further evaluation when they see signs of moisture or growth. Ask your agent what is typical for your price range and area.
General information for the Denver area, not a quote or professional advice. In an emergency, call 911.