How many disinfection treatments are needed

When one treatment is enough

In most domestic cases — when there is a specific, one-off reason and it has been dealt with:

preparing a flat after previous occupants;
treatment after illness in the household;
odour removal where the source has been eliminated;
treatment after renovation or a long period standing empty;
mould treatment where the source of damp has been resolved.

What all of these have in common is one thing: the contamination was an event, not a process. An event ends, and after treatment there is nothing left to regenerate. A second treatment adds nothing there — it is just a second invoice.

The number of treatments is determined by the cause, not by a company's offer. If the cause has been dealt with, a second treatment is not needed.

When a repeat treatment is needed

There are cases where a second treatment is planned from the start — and those can be predicted rather than discovered after the fact.

1Very persistent odoursAfter years of smoking, or after a fire, the smell has soaked into plaster, wallpaper and upholstery filling. The first treatment removes most of it; the second deals with what surfaces once the room has been shut up for a while.

2Flooding with dryingTreatment happens twice: immediately after the water is removed, and again once the structure has dried. Days or weeks pass in between.

3Material that cannot be removedIf the smell or the fungus is in a material that cannot sensibly be taken out, treatment may have to be repeated. We say this in advance, not after the first attempt.

We can usually predict these cases at the inspection. If we say two treatments will be needed, that is part of the original quote and price, not a new invoice a month later.

When a regular schedule is needed

Property	Is a schedule needed
Private flat	No — only in a specific case
Private house	No — only in a specific case
Office	Yes, with heavy footfall
Food business	Yes, under the hygiene plan
Nursery, school	Yes, usually during the holidays
Communal areas	Yes

The logic is simple: if contamination is constantly renewed, the treatment has to be regular too. If it was a one-off event, one treatment is enough.

In premises where a schedule genuinely is needed, it usually follows from the nature of the activity rather than from our recommendation. In a food business, treatment frequency is part of the hygiene plan. In a nursery or school it is logically tied to the holidays, when the rooms are empty. In an office with heavy footfall, contact surfaces are where it makes sense rather than the whole space — and even there, daily cleaning with the right product does more than occasional “big” treatments.

For a private flat a regular schedule is almost never justified. If somebody offers one as a subscription, it is worth asking what exactly changes between visits. In a household, the number of micro-organisms on surfaces is determined by everyday cleanliness and dryness, not by how often it is treated.

If the problem comes back

If a problem returns after treatment, it almost always means one of two things:

The cause has not been dealt with — damp, a leak, a source, or a continuing flow of contamination.
Something was left untreated — a place there was no access to, or a material that should have been removed.

In both cases, repeating the same treatment is not the answer. A concrete example: mould in the corner of a bathroom ceiling, treated and back in exactly the same spot three months later. That is not a question of which product was used — it means the ventilation duct is not drawing, or that damp is coming from the neighbours' side. A second treatment without establishing which will give exactly the same result after exactly the same three months.

Get in touch and we will look at what was left and tell you what has to be done differently. More detail: why mould comes back.

How to check an offer that involves several treatments

If you are offered a cycle of treatments, ask three questions. The answers should be specific; if they are not, that is an answer in itself.

✓ A specific answer sounds like this

“The second treatment is after drying, roughly two weeks later.”
“The second treatment is because the plaster cannot be removed.”
“The price covers both treatments together.”
“If the result after the first is good enough, the second does not happen.”

✗ A vague answer sounds like this

“It always takes three treatments.”
“That is the standard cycle.”
“It will not work without it” — with no explanation why.
Only the first treatment is priced.

Our approach is simple: the number of treatments follows from the inspection, and we state it before the work rather than after. If we see after the first treatment that the planned second one is not needed, we say so.

How to judge the result after the first treatment

To know whether a second treatment is needed at all, the result has to be assessed — and that cannot be done an hour later. A practical timeline looks like this.

On day one, judge only whether the room has been aired and is usable. Nothing else can be assessed at that point.
After a week, look at whether the smell is weakening and whether the treated area is staying dry.
After a month, check the same spot again, ideally at the same time of day.
With mould, the decisive moment is the first heating season after treatment — that is when it becomes clear whether the cause was dealt with.
Photograph the spot from the same angle — memory of how big a patch was is less reliable than a photo.

A concrete example. In a 55 m² two-room flat in Ziepniekkalns, mould covered roughly 0.4 m² in the external-wall corner of the bedroom, behind a wardrobe. After the treatment the client moved the wardrobe 5 cm away from the wall and started airing in the mornings. The patch did not come back the following heating season, and no second treatment was needed. Had the wardrobe stayed where it was, the answer would have been different — and that would not have been the product's fault.

The effect of the season on recurrence

In the Latvian climate, results do not hold equally well all year. In summer, with the windows open and the walls warm, almost any treatment looks successful — including one where the cause was left in place. The first cold spell in autumn is the real test: the walls cool, airing becomes less frequent, and if the moisture balance has not been sorted out, the problem returns exactly where it was.

That is worth mentioning for a practical reason: if the treatment was done in July and the result has been flawless for three months, that is not yet proof. January is the proof. So we do not recommend planning a repeat treatment “preventively” in autumn — it is more sensible to sort out the ventilation and the humidity and see whether anything appears at all.

Frequently asked questions

Do you offer a repeat treatment at a discount?

If a repeat treatment was part of the original plan, it is included in the quote. If the problem came back unexpectedly, we first establish why.

How often should a flat be disinfected?

Regularly — it does not need to be. In a flat, everyday cleanliness and airing are enough, and treatment is done for a specific reason.

A company offered me three treatments — is that normal?

It depends on the situation, but it is worth asking why three specifically and what happens between them. If the answer is not specific, there is reason to doubt it.