Few things make a homeowner’s heart sink quite like sliding the sofa out to vacuum behind it and finding a patch of carpet that looks as though it’s been nibbled down to the backing. Because that, more or less, is exactly what’s happened. I get the calls fairly often, usually with a note of disbelief in the voice: “Something’s eating my carpet.” And in the lovely old houses I work in across London, something very often is.
Carpet moths have had a quiet renaissance in this city, and the grand period homes so many Londoners are proud of turn out to be just about the perfect place for them to set up shop. High wool content, quiet corners, heavy furniture that hasn’t shifted in years – it’s a five-star moth hotel. The frustrating part is how long they can go unnoticed, doing their damage away in the dark while everything looks perfectly fine from above.
The Moth Doing the Damage Isn’t the One You Notice
It’s the Larvae That Eat, Not the Moths
The adult moth that flutters up when you move a curtain is not the one chewing your carpet. The adults don’t actually eat fabric at all. The damage is done by their larvae – tiny, pale, cream-coloured grubs no bigger than a grain of rice – which hatch from eggs laid down in the pile and then feed away for weeks before they ever take to the wing.
What they’re after is keratin, a protein found in animal fibres. Wool is full of it, which is why wool carpets, silk rugs and the odd sheepskin are top of their menu. A single female can lay a couple of hundred eggs in her short life, so by the time you spot one adult on the wing, there may already be a whole generation tucked down in the carpet quietly getting on with it.
Carpet Moth or Clothes Moth?
People call almost anything that eats their carpet a “carpet moth”, and I’m not going to be pedantic about it, but it’s worth knowing what’s really going on. The usual culprits are clothes moths – the webbing clothes moth and the case-bearing clothes moth – and despite the name, they’re perfectly happy chewing through a wool carpet rather than a jumper. There’s a true carpet, or tapestry, moth as well. For your purposes the distinction barely matters: they all go after the same keratin in the same natural fibres, and they all hide away in the same dark, undisturbed places. The name people use usually just reflects whatever the moths got to first.
Why London’s Period Homes Suit Them So Well
Wool Carpets and Grand Old Rooms
The houses I most love working in are the very same ones the moths adore. Victorian and Edwardian terraces tend to come with proper wool carpets, wool runners up the stairs, and rugs that have been in the family for years – all of it pure keratin, all of it on the menu. These are bigger rooms, too, with plenty of quiet corners and the sort of heavy furniture that gets moved roughly never. Behind the wardrobe, under the bed, beneath the armchair in the bay window: these are exactly the calm, dark, undisturbed spots where larvae thrive best.
The stairs are a particular weak spot in these houses. A wool runner pinned down each side gives the larvae a long, sheltered strip to work along, and the very edges – the bits your feet never actually touch – go unbothered by the vacuum for months at a time. I’ve lifted many a stair runner to find the damage hiding neatly down both sides while the centre still looked as good as the day it went down.
Warm Houses, Mild Winters
There was a time when a good cold British winter would knock moth numbers right back every year. Those days are largely behind us. Centrally heated homes and milder winters now mean the little blighters can breed more or less all year round, and pest controllers up and down the country have noticed the rise. By some counts, around one in eight UK households has had a moth problem of one sort or another. In a warm, carpeted London period home, the breeding season barely pauses for breath.
Packed Together and Passed Around
London living does them another favour. Homes here sit close together, are often split into flats, and moths spread easily enough between neighbouring spaces. Then there’s the city’s great fondness for a second-hand find. A gorgeous vintage rug from a market stall, or an inherited runner from a relative’s house, can carry eggs in with it, and just like that you’ve imported the problem without ever realising. I’ve traced more than one stubborn infestation back to a so-called bargain rug.
The Signs Worth Watching For
What an Infestation Looks Like
The classic giveaway is bald or threadbare patches, and they nearly always start in the parts of the carpet nobody walks on. You might spot the larvae themselves – small, pale, rice-like grubs – or the fine silky webbing and gritty little specks they leave behind. The adults are small and beige or mottled brown, and they don’t flap about in the open the way a fruit fly does. They scuttle, and they prefer the shadows, so more often you’ll see one dart for cover when you disturb a dim corner.
Here’s one I always pass on: if you keep finding little moths around the house and can’t for the life of you work out where they’re coming from, don’t only check the wardrobe. The carpet is well worth a proper look as well.
Where to Look First
Pull the furniture out. I do mean it – the damage almost always begins where the carpet is dark, still and rarely cleaned. Under beds and sofas, behind long curtains, tight along the skirting boards, in the spare room that gets used twice a year, and up the quiet outer edges of the stairs. By the time it reaches the open, well-trodden middle of a room, the infestation has usually been running for a good while.
I was called to a converted Victorian flat where the owner was baffled by a handful of moths in the lounge. We pulled out a heavy sideboard that hadn’t budged in ten years, and the carpet behind it had been reduced to little more than netting. Everything in front of it looked immaculate. That’s moths all over: out of sight and out of mind, until the day you finally move the furniture.
How to Keep Them Out – and What to Do If They’re In
The Dull Habits That Genuinely Work
Prevention isn’t glamorous, but it does work. Regular, thorough vacuuming is the single best thing you can do, and the trick is to bother with the bits everyone skips: the edges, the corners, and under the furniture. That lifts out eggs and larvae before they get a foothold, and it clears away the dust, hair and crumbs they’re happy to feed on alongside the wool.
Move your furniture about now and then so no patch of carpet sits dark and undisturbed for months on end. Keep rooms aired and not too humid, since the damp, still corners are the ones that come a cropper. And give any second-hand rug a very good clean and a close inspection before you let it across the threshold.
Pheromone traps from the hardware shop are worth a mention as well. They won’t clear an infestation on their own, since all they catch is the adult males, but they make a handy early-warning system. If a trap in a quiet room suddenly starts filling up, you’ve learned something useful before the damage has a chance to spread.
Where My Job Ends and Pest Control Begins
I’ll be straight with you here, because honesty matters more to me than drumming up work. A proper carpet clean does real good against moths. Hot water extraction lifts out eggs, larvae and the debris they feed on far more thoroughly than any domestic vacuum manages, and it’s genuinely worth doing. But if you’ve got an established infestation, cleaning on its own won’t see it off. Moths have a knack for tucking eggs down into the underlay, the floor gaps and the skirting, where no carpet clean can reach.
For a real infestation you need proper pest control – treatment designed to kill off every life stage, eggs and larvae included, because miss a few and you’re back to square one within weeks. The sensible order is usually to deal with the infestation first and bring a deep clean in afterwards, to lift out the residue and give the carpet its best chance of recovery. Anyone who tells you a single shampoo will solve a serious moth problem isn’t being straight with you.
The Long and Short of It
Carpet moths aren’t a sign of a dirty home. Some of the worst cases I’ve ever seen have been in beautifully kept houses, because it’s the wool, the warmth and the quiet corners they’re chasing, not the mess. London’s lovely old homes simply happen to tick every single box on their list.
The good news is that they’re beatable. Catch them early, keep on top of the vacuuming in the places you’d far rather ignore, treat the carpet with a little respect, and know the point at which a problem has grown past what a clean alone can fix. Look after a wool carpet properly and it’ll outlast almost everything else on your floor – moths and all.
