Why Do Fleas Problems Keep Coming Back in Greenwich Properties?

First: Is It Even a Recurrence?

More often than with any other pest on this site, the answer is no.

Flea pupae are protected inside a cocoon and hatch over a period rather than all at once. They emerge in response to warmth and vibration, so they come out as people walk about - which means seeing fleas in the days after a treatment is the expected pattern, not a problem.

The measure is the trend, not the presence. Numbers falling across the two weeks after treatment is a job going correctly. Numbers holding steady or rising after that window is when to make the call.

1. The Floors Were Cleaned Too Soon

The most common genuine cause, and it is almost always well-intentioned.

Vacuuming or mopping treated floors inside the two-week window removes the treatment before the remaining pupae have hatched into it. Every subsequent hatch then arrives on an untreated floor.

It happens most often in three situations: a household that vacuums daily out of habit, a pre-tenancy clean booked before the treatment date was known, and a cleaner who was never told. All three are avoidable with a conversation.

2. The Animal Was Not Treated, or the Treatment Lapsed

The property treatment deals with what is in the carpet. If the pet is still carrying adults, it re-seeds the floor continuously and no property treatment will outrun that.

Three versions of this:

• The animal was never treated, because the household assumed the property treatment covered everything.
• The animal was treated, but months ago, and the protection has lapsed.
• One animal in a multi-pet household was treated and another was not.

Veterinary treatment and property treatment in the same week is what closes both halves at once.

3. Somewhere Was Not Treated

Usually somewhere that does not feel like part of the house.

• The car, if the animal travels in it.
• A garage, shed or utility room where the animal sleeps or shelters.
• A conservatory or porch that was not included in the room count.
• A room the animal was not supposed to go into but does.
• A subfloor or decked area where wildlife has access.

This is why the survey asks where the animal actually goes rather than where it is meant to go. A treated house and an untreated dog bed in the garage is a complete explanation for a problem reappearing a month later.

4. The Property Stood Empty

The landlord and agent version, and it is entirely predictable.

Treated, then empty for weeks. No footfall, so no trigger, so the remaining pupae stay dormant. The new tenant arrives, walks about, and the hatch begins on a floor whose treatment has had weeks to degrade.

The fix is scheduling rather than money: get the floors walked on during the fortnight after treatment, and do not book a clean into that window.

The Reinfestation Routes That Have Nothing to Do With the Treatment

Where a property has been genuinely clear for a month or more and fleas return, it is a new introduction rather than a survival:

• Wildlife access to a subfloor, shed, garage or the space under decking. Common in properties backing onto open ground.
• The animal picking them up outside - a park, another household, kennels, a groomer.
• A visiting animal.
• Second-hand furniture, particularly upholstered items from a household with pets.

The tell is timing. A clear month or more, then a fresh start, points at introduction. Continuous low-level activity from the treatment onwards points at one of the four causes above.

What a Realistic Result Looks Like

A treated property, a treated animal kept on current protection, and floors left alone for the fortnight afterwards will normally clear and stay clear.

What nobody can promise is that an animal that goes to parks and meets other animals will never bring one home again. That is an introduction, not a recurrence, and the honest answer is that keeping the pet's own protection current is what deals with it - not repeated property treatments.

The Two Weeks After Treatment, Day by Day

Most flea disappointments come from this fortnight being handled wrongly, so here it is set out plainly.

If numbers are not falling by the end of the second week, that is the point to contact us - and the first three questions will be whether the floors were cleaned, whether every animal's own treatment is current, and whether the car, shed or garage were included.