Rat under my house.
Author
Discussion

dhutch

Original Poster:

17,888 posts

227 months

Thursday 4th September 2025
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I have seen a rat going in and out of a broken airbrick leading to the underfloor void beneath half our house.

Fortunately no signs of ratty being inside the house, but I have bought some mesh to cover the airbrick.

How to ensure I keep him out when I put it up, rather than trap him inside!

shtu

4,596 posts

176 months

Thursday 4th September 2025
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One rat seen = more than one rat exists.

I'd get a pest controller in to help with that, last thing you want is rats setting up shop, they're more intrusive than mice, voles, etc.


hidetheelephants

36,164 posts

223 months

Thursday 4th September 2025
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In the long term I'd be getting the airbrick replaced, rats can chew through most other materials. bds.

ARHarh

4,892 posts

137 months

Thursday 4th September 2025
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They can breed like nothing on earth, 6 weeks to sexual maturity, 23 day pregnancy and up to 18 pups each time. Get a poison box and put it against your wall, they like to travel along walls. They will be gone in a week or so.

The Three D Mucketeer

7,493 posts

257 months

Thursday 4th September 2025
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I have a number of chocolate sauce baited rat traps in the void... not so much for rats but mice , I don't want them chewing cables and pipe insulation ... I inspect them periodically ... I don't use poison because I want to dispose of any corpses .

Wacky Racer

41,388 posts

277 months

Thursday 4th September 2025
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A dead rat gives off a very distinctive putrid smell.

Fortunately, it usually goes after 3 or 4 days when the body decomposes.

Huntsman

9,400 posts

280 months

Thursday 4th September 2025
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Are you sure its not in the kitchen?

LennyM1984

1,138 posts

98 months

Thursday 4th September 2025
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Huntsman said:
Are you sure its not in the kitchen?
If so, probably the best approach is to Fix that rat, that's what you gonna do, you gonna fix that rat

dhutch

Original Poster:

17,888 posts

227 months

Thursday 4th September 2025
quotequote all
hidetheelephants said:
In the long term I'd be getting the airbrick replaced, rats can chew through most other materials. bds.
Yeah, and that would be long term plan, but have also gone for 1.5mm thick stainless with10mm holes on 15mm pitch, rather than lightweight woven or expanded mesh. So should be fairly substantial!

dhutch

Original Poster:

17,888 posts

227 months

Thursday 4th September 2025
quotequote all
Huntsman said:
Are you sure its not in the kitchen?
Kitchen has solid floors, as does the hallway, just the two living rooms have suspended floors.

We occasionally get mice in the kitchen, but have not seen and indication of rats in the house.

dhutch

Original Poster:

17,888 posts

227 months

Thursday 4th September 2025
quotequote all
wyson said:
I’d chuck some poisoned bait in there before sealing up, so the critter can eat it and die and won’t chew through other things.

Might whiff and you might get some maggots for a few weeks, but not much you can do about where they die unfortunately.
Wacky Racer said:
A dead rat gives off a very distinctive putrid smell.

Fortunately, it usually goes after 3 or 4 days when the body decomposes.
Yeah, I am not too worried about that, more about the damage it might do chewing its away out if trapped!
Fortunately when the house house was rewired and replumbed we did it without lifting the floors, so there is much in the void other than floor joists.

dhutch

Original Poster:

17,888 posts

227 months

Thursday 4th September 2025
quotequote all
shtu said:
One rat seen = more than one rat exists.
I'd get a pest controller in to help with that, last thing you want is rats setting up shop, they're more intrusive than mice, voles, etc.
ARHarh said:
They can breed like nothing on earth, 6 weeks to sexual maturity, 23 day pregnancy and up to 18 pups each time. Get a poison box and put it against your wall, they like to travel along walls. They will be gone in a week or so.
Yeah, I am aware of that, and I guess that is what I would be doing if I had seen them inside the house.

Sigh. Any advice on how to go down that route, or is it just a case of ring local firms found via google?

Mammasaid

5,615 posts

127 months

Thursday 4th September 2025
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dhutch said:
Huntsman said:
Are you sure its not in the kitchen?
Kitchen has solid floors, as does the hallway, just the two living rooms have suspended floors.

We occasionally get mice in the kitchen, but have not seen and indication of rats in the house.
Woosh....


dhutch

Original Poster:

17,888 posts

227 months

Thursday 4th September 2025
quotequote all
LennyM1984 said:
Huntsman said:
Are you sure its not in the kitchen?
If so, probably the best approach is to Fix that rat, that's what you gonna do, you gonna fix that rat
Mammasaid said:
Woosh....
Very good. Although in my defence, that track is a year older than I am!

myvision

2,131 posts

166 months

Thursday 4th September 2025
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The Three D Mucketeer said:
I have a number of chocolate sauce baited rat traps in the void... not so much for rats but mice , I don't want them chewing cables and pipe insulation ... I inspect them periodically ... I don't use poison because I want to dispose of any corpses .
My neighbour saw one in his garden so I bought some rat traps I think they'd break your finger if they snapped back on you!
Baited up with cadburys chocolate buttons and put them along his back fence I got four in two nights nothing been seen since.

shtu

4,596 posts

176 months

Thursday 4th September 2025
quotequote all
dhutch said:
Yeah, I am aware of that, and I guess that is what I would be doing if I had seen them inside the house.

Sigh. Any advice on how to go down that route, or is it just a case of ring local firms found via google?
I suppose what I am actually saying is

They're colony animals, you've probably seen several rats, one at a time. Don't do what some will suggest, stuff loads of poison down the hole and seal it up, because a)it'll stink b)you may not apply enough poison, trapping a colony in the void instead.

Hence - get a pro for this one. You can usually find local independent guys who will do a good job, and aren't expensive. Last time I got one out for something I asked him how much he would charge, after some tooth-sucking he came up with "maybe £40". I am properly rural though so he's used to farmer pricing.

I suspect what they'll do is poion in the hole, leave it open, and some bait boxes nearby too. He'll probably be able to work out what their runs are. (as a starter, look for any greasy-looking marks)

It's the time of year for rodents to try and find a winter home, as the fields are harvested.

Once you get it initially sorted, some bait boxes around the perimiter as suggested above, though I tend to put that sort of thing at the garden perimiter rather than encourage them towads the house.

Sonic repellers - pointless waste of money.
Glue traps - just don't, they're hideous things, and outdoors will trap birds etc.

Jobbo

13,873 posts

294 months

Thursday 4th September 2025
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Rats generally come from sewers so there may be an issue in your foul pipe - definitely worth getting a professional in, not simply to put down poison but to address where they are coming from and maybe install a flap in your pipe, repair cracks in it etc.

Huntsman

9,400 posts

280 months

Thursday 4th September 2025
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dhutch said:
Very good. Although in my defence, that track is a year older than I am!
That makes me feel old.

dhutch

Original Poster:

17,888 posts

227 months

Thursday 4th September 2025
quotequote all
Jobbo said:
Rats generally come from sewers so there may be an issue in your foul pipe - definitely worth getting a professional in, not simply to put down poison but to address where they are coming from and maybe install a flap in your pipe, repair cracks in it etc.
We're in a semi-rural area, all be in not far from urban sprawl, so I expect they are just in and around the garden and the like.

As far as I am aware the soil pipes are all in reasonable nick. Most are 100yo ceramic, with 80s PVC replacing the cast iron verticals up the house.

Downward

5,700 posts

133 months

Thursday 4th September 2025
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Poison it.
We had 1. Cost us over £1k in damage. And that’s just the things we repaired.