A biztosítási fedezet beázás esetén is érvényes.

Biztosítási means insurance-related or of insurance.

It comes from the noun biztosítás = insurance plus the adjective-forming suffix -i. This suffix is very common in Hungarian and turns nouns into adjectives:

• iskola → iskolai = school, school-related
• város → városi = city, urban
• biztosítás → biztosítási = insurance-related

So biztosítási fedezet literally means something like insurance coverage.

In this sentence, fedezet means coverage.

On its own, fedezet can also mean backing, funds, or cover depending on context, but in insurance language biztosítási fedezet is a standard phrase for insurance coverage.

So this is not physical covering; it is the insurance sense of what the policy covers.

Beázás refers to water leaking in, especially into a building through the roof, walls, windows, or pipes. It often implies water damage caused by leakage.

It comes from the verb beázik, which means to get wet because water leaks in or to leak through and cause soaking.

So beázás is not exactly the same as every kind of flood damage:

• beázás = leakage / water ingress / seepage causing wet damage
• árvíz = flood
• elázás = getting soaked

A learner should think of beázás as a fairly specific kind of water damage, common in housing and insurance contexts.

Esetén means in case of or in the event of.

It is a formal postposition-like element used after a noun. In this sentence:

• beázás esetén = in case of leakage / in the event of water ingress

This is a very common pattern in formal Hungarian:

• tűz esetén = in case of fire
• baleset esetén = in case of an accident
• probléma esetén = in case of a problem

It sounds more formal and written than something like:

• ha beázik = if it leaks / if water gets in

So the sentence has a slightly formal, insurance-document style.

Is means also, too, or sometimes even, and in Hungarian it usually comes after the word or phrase it belongs to.

Here it follows the whole phrase beázás esetén, so the meaning is:

• beázás esetén is = also in case of leakage / even in case of leakage

That placement is important. Compare:

• A biztosítási fedezet beázás esetén is érvényes.
  = The coverage is valid also in the case of leakage.

• A biztosítási fedezet is érvényes.
  = The coverage too is valid.

So is attaches to whatever comes immediately before it.

Because Hungarian normally leaves out the verb to be in the present tense, third person when the predicate is a noun or adjective.

Here:

• A biztosítási fedezet ... érvényes.
• literally: The insurance coverage ... valid.

That is normal Hungarian.

Compare:

• A szerződés érvényes. = The contract is valid.
• Ez igaz. = This is true.

But in the past or future, or in some other structures, the verb appears:

• A szerződés érvényes volt. = The contract was valid.
• A szerződés érvényes lesz. = The contract will be valid.

So the missing is is not an omission in style; it is standard grammar.

A is the definite article, meaning the.

So A biztosítási fedezet means the insurance coverage.

It is used because the sentence is talking about a specific coverage, probably the coverage of a particular policy or contract already understood from context.

If you removed the article, the sentence could sound more like a heading, label, or a more general statement, but with A, it clearly refers to a specific known item.

The word order is normal, but Hungarian word order is flexible and often shows topic and focus rather than just grammatical roles.

Here:

• A biztosítási fedezet = the topic, what we are talking about
• beázás esetén is érvényes = what is being said about it

So the sentence structure is basically:

• As for the insurance coverage, it is valid also in case of leakage.

Another possible order would be:

• Beázás esetén is érvényes a biztosítási fedezet.

This puts more attention on in case of leakage too.

Both are grammatical, but the original version is a very natural neutral statement.

They are close, but not always identical.

Érvényes means valid, applicable, or effective. It is very natural for things like:

• contracts
• tickets
• documents
• insurance coverage

Érvényben van literally means is in force. It is often used for:

• laws
• rules
• regulations
• official measures

In this sentence, érvényes is the better choice because it means that the insurance coverage applies in that situation.

So:

• A biztosítási fedezet ... érvényes. = The insurance coverage is valid / applies.
• A szabály még érvényben van. = The rule is still in force.

After esetén, Hungarian often uses a bare singular noun to express a general situation or type of event.

So:

• beázás esetén = in case of leakage
• not necessarily in case of one specific leakage event

This is similar to formal English expressions like:

• in case of fire
• in case of emergency

Hungarian often prefers this compact structure in formal language. Using an article here would usually sound less standard in this kind of phrase.