How long does it take for a rat to decompose?

You might assume that once a rat is dead, it won’t cause you any more grief. Unfortunately, this isn’t always the case. After rats die, their bodies will decompose. During the decomposition process, gases inside the rat are released. As various organisms break down the rat’s body, they produce other chemicals, many of which contribute to the horrific smell of a rotting animal carcass. If you use rat poison in your home, you need to ensure you dispose of any resultant rat carcasses before they start to decompose.

How long does it take for a rat to decompose?

The decomposition rate for a dead rat can vary considerably depending on numerous factors. The most critical factor in determining the decomposition rate will be the temperature. When it’s hot outside, rats decompose faster than in colder weather. Think of it like the meat you buy from the supermarket; it will last a lot longer in your fridge or freezer than out in the open. Rats that die inside will take longer to decompose than those that die outside because they are less exposed, even if the temperature is slightly warmer inside.

How long does it take for a rat to decompose?
How long does it take for a rat to decompose?

A dead rat at room temperature takes around three weeks to decompose completely, but it starts rotting almost immediately. If the dead rat isn’t removed swiftly, the smell will build in strength and linger for longer. Trust us; you really don’t want to experience the stench of a decomposing rat.

The odour isn’t the only issue decomposing rats can cause. Dead rats present a severe health hazard, much more so than living specimens. Rat carcasses will attract flies, which then lay their eggs in and on the rat’s body. These eggs hatch into larvae, commonly known as maggots, which are responsible for their own set of problems. Any parasites on the rat’s carcass will start looking for another living host, which could end up being you or your pets.


No one wants to deal with bugs, rats, micecockroaches, flies, textile pests, insects, wasps, hornets, or bee control and ants in their house or business.

Pest infestations should be addressed as soon as possible, since if left unchecked, they might spread rapidly and cause structural damage to your house, health risks, lots of stress or even a fire danger.

At Bon Accord, we provide a full range of home pest control services as well as the Bon Accord Helpline, which allows us to deliver our clients with the level of service they require when dealing with rodents, ants, cockroaches and other infestations.

We offer a full range of services from basic to expert, ranging from a self-service solution with all the tools you’ll need to DIY treatments, supported remotely by one of our technicians to our premium service in which one of the specialists performs the whole treatment

How To Get Rid of Rats

Bon Accord provides specialist pest control services to individuals and businesses throughout London. Our pest control technicians have the extensive knowledge and experience required to diagnose and resolve even the most stubborn pest infestations rapidly and comprehensively. When we’re through, we guarantee your home or business will be completely free from pests.

Read more about pest control services for rats in London.

Get in touch with Bon Accord your local pest control expert.


Karin HarndenKarin Harnden
17:14 05 May 24
We thought we had bedbugs but could find no evidence apart from what we thought were bites. I called Bon Accord and Gabriel was there within a couple of hours. He told us we had carpet beetle. Finding the evidence and showing us photos of the skin reaction which was exactly what we had. He advised and returned at a time to suit us to spray which was done thoroughly and efficiently. No sign of the little critters returning. Thank you Gabriel.
Luiza LoboLuiza Lobo
21:02 11 Apr 24
Gabriel went above and beyond. He is extremely knowledgable and very efficient at what he does. The results were outstanding. Nothing is too much for him. Delighted with his professionalism and work.
sam zsam z
19:11 03 Apr 24
Top-notched pest control service!! Went above and beyond to eradicate the rats from our property. Gabriel even offered to further investigate the infestation issues for our neighbours. We found him to be extremely professional and easy to work with. We highly recommend Gabriel to anyone in need of pest control.
23:29 02 Apr 24
Gabriel provided great service , responded quickly on an emergency for pest infestation, professional and friendly. No more pests at home.
Felicity GrayFelicity Gray
21:53 02 Apr 24
Gabriel was absolutely wonderful, a real life saver when I found a mouse by my bed at 10pm. He came in less than an hour and was able to catch the mouse and put my mind at rest so I could go to sleep! Highly recommend, fab service and lovely people.
Med KashaniMed Kashani
10:54 24 Feb 24
Gabriel turned up with an hours notice one evening and immediately identified the issued. He works efficiently and professionally throughout with timely follow-ups to ensure the problem was resolved. Once completed he was kind enough to continue to check in to see that the issue had gone. Having had Rentokil previously that spent two years doing very little this was a complete breathe of fresh air and solved the problem in less than two weeks. We are grateful and would highly recommend his services.
Nesma TalaatNesma Talaat
20:26 20 Feb 24
We were lucky to have found Bon Accord, they responded very fast to our request and Gabriel was very helpful and informative. He made several visits and did his absolute best until the mice problem we had was gone. Highly recommended.

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