Why Moths Are Getting Worse in Cities

By Richard Collings | 22 January 2026 |

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If you live in a UK city and it feels like clothes moths are everywhere — you’re not imagining it. People often notice the damage first: tiny holes in wool jumpers, thinning patches in carpets under furniture, or the small grain-like casings along skirting boards.

It’s easy to assume there are simply “more moths than there used to be”. But what’s really happening is a perfect storm of urban living: warmer microclimates, consistently heated homes, dense housing, and modern storage habits that unintentionally create ideal breeding conditions.

Before going further, one important point:

It’s not the adult moths that cause damage — it’s the larvae.
The adult moth’s job is to mate and lay eggs. The larvae (tiny caterpillars) are the stage that feeds on natural fibres such as wool, fur, feathers, silk, and carpets. The Natural History Museum confirms that the two main domestic species in the UK — the common clothes moth and the case-bearing clothes moth — are responsible for the vast majority of household damage.
https://www.nhm.ac.uk/take-part/identify-nature/common-insect-pest-species-in-homes/clothes-moths-identification-guide.html

Cities are warmer — and moths thrive in warmth

One of the biggest drivers behind increasing moth problems in urban homes is temperature.

The urban heat island effect

Cities are measurably warmer than surrounding rural areas. Buildings, roads, and pavements absorb heat during the day and release it slowly at night, keeping urban environments consistently warmer. The Met Office explains this phenomenon, known as the urban heat island effect, and why it is strongest in built-up areas.
https://www.metoffice.gov.uk/weather/learn-about/weather/types-of-weather/temperature/urban-heat-island

For clothes moths, this matters because warmth accelerates their life cycle. Warmer conditions can mean:

Faster development from egg to larva to adult
More breeding cycles per year
Fewer cold periods that would normally slow population growth

In practical terms, many city homes now provide moth-friendly temperatures for most of the year, not just during summer.

Central heating creates year-round breeding conditions

Modern homes, especially flats, are kept at fairly stable temperatures throughout the year. Combined with insulation and shared heat from neighbouring properties, this creates an indoor climate that feels like permanent spring to insects.

That’s why many people now report moth problems that feel constant rather than seasonal.

Dense housing makes infestations harder to eliminate

Moths travel more easily in connected buildings

Flats, maisonettes, conversions, and terraces often have shared structural spaces such as:

Loft voids
Wall cavities
Pipe runs and service ducts
Communal hallways and storage areas

Moths don’t need to be strong flyers to spread. Eggs and larvae can be transported via shared spaces, furniture, vacuum cleaners, or second-hand items moving between neighbouring flats.

This can lead to a frustrating cycle where one household treats the problem, only for it to reappear months later.

Small homes create more undisturbed “dead zones”

Clothes moth larvae prefer dark, quiet areas that are rarely disturbed. Urban homes often contain plenty of these:

Carpets under beds and sofas
Furniture pushed tight against walls
Overfilled wardrobes with little airflow
Storage boxes under beds

These areas can quietly support an infestation for months before the damage becomes obvious.

Modern urban lifestyles can unintentionally encourage moths

Long-term clothing storage

Many people now own fewer clothes but store them for longer — capsule wardrobes, seasonal rotations, sentimental pieces, and occasion wear. Unfortunately, moths thrive on items that are:

Rarely worn
Stored in darkness
Left undisturbed for long periods

Wool coats, cashmere jumpers, scarves, and suits are prime targets.

Second-hand and vintage clothing

Buying second-hand is excellent for sustainability and budgets, but moth eggs and larvae can hitchhike on:

Wool jumpers
Rugs and throws
Upholstered furniture
Vintage blankets and textiles

This doesn’t mean you should avoid second-hand — it simply means inspecting and treating items before adding them to your wardrobe is wise.

Indoor drying and limited ventilation

Many city homes dry washing indoors, particularly during colder months. Combined with poor airflow in bedrooms and wardrobes, this can create slightly humid, still environments that moth larvae prefer.

Are there actually more moths — or just more infestations?

For clothes moths specifically, the main issue is often higher survival rates indoors, not necessarily a sudden explosion of outdoor populations.

The British Pest Control Association (BPCA) explains that clothes moth larvae feed on natural fibres, particularly when fabrics contain traces of perspiration or food. That means worn-but-not-washed garments can be especially attractive.
https://bpca.org.uk/a-z-of-pest-advice/clothes-moth-control-get-rid-of-clothes-moths-bpca-a-z-of-pests/189171

In busy city lifestyles, it’s common for coats, knitwear, and workwear to be worn multiple times between washes — which unfortunately benefits moth larvae.

What you can do about it (practical UK guidance)

The good news: clothes moths are manageable with the right approach. You don’t need to resort to extreme measures, but you do need to be thorough.

1. Confirm you really have clothes moths

Common signs include:

Irregular holes in wool, cashmere, silk, or carpets
Fine webbing in corners or on fabrics
Tiny cream-coloured larvae
Small tube-like casings along skirting boards

The Natural History Museum’s guide is useful for correct identification:
https://www.nhm.ac.uk/take-part/identify-nature/common-insect-pest-species-in-homes/clothes-moths-identification-guide.html

2. Clean the habitats, not just the clothes

Moths are often living in:

Carpet edges and under furniture
Wardrobe floors and corners
Skirting boards and cracks
Under beds and along walls

Vacuum thoroughly, especially in hidden areas, and dispose of the vacuum contents immediately in a sealed bag.

3. Use traps for monitoring

Pheromone traps can help you see whether adult male moths are present and where activity is strongest. They are best used as monitoring tools rather than a complete solution.

4. Treat affected textiles properly

Freezing
For delicate items, freezing can be effective. English Heritage provides guidance on freezing textiles for moth control, commonly used in museum and conservation contexts.
https://www.english-heritage.org.uk/siteassets/home/learn/conservation/collections-advice--guidance/clothes-moth-prevention-and-control-guideline.pdf

Professional heat treatment
Heat treatment can also be effective when applied correctly, particularly for larger infestations or valuable items that are difficult to treat at home.

If you are looking for a UK-based option, this resource explains professional heat treatment for clothes moths:
https://www.mothkill.co.uk/clothes-moth-heat-treatment/

5. Adjust your home environment

Long-term prevention often comes down to small habit changes:

Avoid overfilling wardrobes
Allow light and air circulation around clothes
Wash or clean wool items before long-term storage
Use sealed storage bags or boxes for off-season clothing
Occasionally move furniture and vacuum beneath it

Several UK councils provide similar guidance for residents dealing with clothes moths, such as Hammersmith & Fulham Council:
https://www.lbhf.gov.uk/pest-control-services/pests-and-vermin-we-treat/common-clothes-moth

A simple routine for second-hand clothing

If you regularly buy wool or vintage clothing, this routine can prevent many infestations:

Inspect seams, cuffs, collars, and folds under bright light
Wash or dry-clean according to care labels
If washing isn’t possible, consider freezing or professional treatment
Store separately at first and monitor

This small habit can prevent introducing moths into your home.

Are moth problems linked to climate change?

Partly, yes. Warmer average temperatures and more frequent heatwaves can contribute. But in cities, the effect is amplified by:

The urban heat island effect
Constant indoor heating
Dense housing
Modern storage habits

That combination explains why clothes moth problems often feel especially severe in urban environments.

The bottom line

Clothes moths are getting worse in cities because urban homes unintentionally provide everything they need: warmth, shelter, undisturbed spaces, and access to natural fibres.

The solution isn’t panic — it’s strategy: