Written by a Zeus Services Certified Technician
We provide same-day dead animal removal across every London borough, including odour treatment and disinfection.
Why the Smell Gets Worse Over Days, Not Better
Decomposition releases ammonia, hydrogen sulphide and other gases that intensify over roughly the first 3–7 days before gradually declining as the process completes — which is why the smell so often seems to be getting worse each day rather than fading. This is also commonly a delayed consequence of DIY rodenticide use: rats or mice that consume bait frequently retreat into wall cavities, loft insulation or subfloor voids to die, out of sight and out of reach.
Why You Shouldn't Try to Locate It Yourself
Beyond the unpleasantness, decomposition gases can cause genuine respiratory irritation, and the process attracts secondary pests — blowflies, phorid flies and dermestid beetles — that carry their own health risks. Cutting into walls or ceilings blindly to search for the source often causes unnecessary damage without finding the carcass, since it can be several feet from where the smell is strongest depending on airflow within the void.
How Professional Removal Actually Works
1. Precise Location, Not Guesswork
Thermal imaging cameras and probe equipment locate the carcass within wall cavities, floor voids or loft spaces before any access work begins, minimising unnecessary damage to the property.
2. Minimal Access, Maximum Care
Wherever possible, retrieval works through existing service voids and access points. Where an opening is required, it's kept to the smallest size necessary.
3. Hospital-Grade Disinfection
The affected area is treated with EN14476-certified disinfectant to eliminate bacteria and viruses from the decomposition process, followed by a molecular odour neutraliser — not a masking fragrance — that removes the smell rather than covering it up.
4. Secondary Pest Treatment
Blowfly larvae, phorid flies and dermestid beetles drawn in by the decomposition are treated directly. Skipping this step is a common reason smaller pest problems persist even after the carcass itself has been removed.
Stopping It From Happening Again
A dead rodent in a void is very often a sign of an entry point that needs sealing, not just a one-off event. Pairing removal with a proper rodent proofing survey — sealing the gaps that let rodents in to begin with — is the only way to stop this happening again in the same spot.