Locating the source
Work methodically, because the smell spreads through cavities.
Ask neighbors
Check units on both sides, above and below. The strongest unit narrows the cavity.
Follow the flies
Small flies gathering at an outlet, light fixture or baseboard often mark the spot.
Check vents first
Dryer vents, bath exhaust ducts and range hood ducts are common entry points for birds and are easier to open than walls.
Look for staining
A damp or discolored spot on drywall or ceiling can show where fluids reached the surface.
Open the smallest hole possible
Cut an inspection opening where the evidence points, then enlarge only if needed.
Why waiting it out is not always the answer
A small rodent's decay odor often fades over a couple of weeks in dry Colorado air. In a single-family house, some owners simply wait. In an apartment community, waiting means several residents living with it, repeat work orders, and flies inside units. It can also leave fluids soaked into insulation or the ceiling of the unit below.
When the source can be reached, removing it and cleaning the cavity is usually faster overall. When it cannot, an odor vendor can treat the cavity and nearby units, but expect the smell to taper rather than vanish immediately.
After removal
- Bag the animal and any soiled insulation and dispose of it per local rules.
- Clean the cavity surfaces with a disinfectant and an enzyme cleaner.
- Replace insulation or drywall that absorbed fluids.
- Seal the entry point: vent screens, gaps at utility penetrations, damaged soffits.
- Notify the pest control contractor so the building's exclusion plan gets updated.
- Close the work orders in every affected unit, not only the first one.
Common entry points at south metro communities
- Dryer vent hoods
- Missing or broken flaps let birds nest inside
- Roof and soffit vents
- Gaps where screens have rusted or been damaged
- Utility penetrations
- Gas, cable and refrigerant line holes that were never sealed
- Garage and storage areas
- Ground-level rooms in podium buildings that connect to wall cavities
- Balcony and patio slabs
- Gaps along the base of exterior walls where framing meets concrete, worth a look when droppings turn up outdoors
General information for Centennial, not a quote or professional advice. In an emergency, call 911.