تكلفة التصليح كبيرة.

A natural Egyptian pronunciation is roughly:

taklifet et-taSliiH kibiira

A few notes:

• تكلفة is often pronounced taklifa by itself, but in this sentence it is part of an iḍāfa (a possessed/linked phrase), so the final ة is heard as -t:
  taklifet
• التصليح begins with ت, which is a sun letter, so the l of ال is not pronounced separately.
  So الـ + تصليح sounds like et-taSliiH rather than el-tasliiH
• كبيرة is pronounced kibiira

If you want a very simple learner-friendly version, you can say:

taklifet et-tasliiH kibiira

Because Arabic usually does not use a present-tense verb meaning is/are in sentences like this.

So instead of saying:

• The cost of the repair is high

Arabic simply says:

• Cost of the repair high

This is called a nominal sentence. It is completely normal in both Standard Arabic and Egyptian Arabic.

If you wanted the past, then Arabic would use a verb, for example:

• كانت تكلفة التصليح كبيرة = The cost of the repair was high

Because تكلفة التصليح is an iḍāfa construction, often called a genitive/possessive phrase.

Structure:

• تكلفة = cost
• التصليح = the repair / the repairing

Together:

• تكلفة التصليح = the cost of the repair

In an iḍāfa:

• the first noun usually does not take ال
• the second noun can be definite
• if the second noun is definite, the whole phrase becomes definite

So even though تكلفة has no ال, the entire phrase تكلفة التصليح is still definite: the cost of the repair.

Because تكلفة is a feminine noun.

In Arabic, adjectives usually agree with the noun they describe in:

• gender
• number
• definiteness

So:

• تكلفة كبيرة = a big/high cost
• التكلفة كبيرة = the cost is big/high

Since تكلفة is feminine, the adjective must also be feminine:

• كبيرة not كبير

If the noun were masculine, you would use كبير.

Because in Arabic, adjectives normally come after the noun they describe.

So:

• تكلفة كبيرة = a big/high cost

not the other way around.

In this sentence, the pattern is:

• تكلفة التصليح = the cost of the repair
• كبيرة = big/high

So the descriptive word comes after the noun phrase.

التصليح means the repairing or the repair job, and in Egyptian Arabic it is a very natural everyday word.

A learner may also know إصلاح, which is more formal and more common in Modern Standard Arabic.

Very roughly:

• التصليح = colloquial/everyday repairing / repair work
• إصلاح = more formal repair / fixing

In Egyptian speech, تصليح is extremely common in daily conversation.

So تكلفة التصليح sounds natural in Egyptian.

Because ت is a sun letter.

In Arabic, when ال comes before a sun letter, the l sound assimilates into the next consonant.

So:

• ال + تصليح
• not pronounced el-tasliiH
• but rather et-taSliiH / it-taSliiH

This is true in both Standard Arabic and Egyptian, though the exact vowel may sound a little different depending on accent.

The wording works well in Egyptian Arabic, and it is also very close to Standard Arabic in writing.

That is common with many simple noun sentences.

What feels especially Egyptian here is:

• the everyday choice التصليح
• the spoken pronunciation, such as taklifet et-taSliiH kibiira

In full Standard Arabic with case endings, it would look more formal, but the written consonants are basically the same.

So a good way to think about it is:

• written form: acceptable and understandable very broadly
• spoken use: very natural in Egyptian

Yes, كبيرة literally means big, but Arabic often uses big/large to talk about an amount being high.

So تكلفة التصليح كبيرة means the cost is large/high.

That said, Egyptians may also say things like:

• تكلفة التصليح غالية = the repair cost is expensive
• تكلفة التصليح عالية = the repair cost is high

All of these are natural, with slightly different shades:

• كبيرة = large/big amount
• عالية = high
• غالية = expensive/costly

In Egyptian Arabic, the usual way is to use مش before the adjective:

• تكلفة التصليح مش كبيرة = The cost of the repair is not high

This is the most useful everyday pattern for learners.

More examples:

• الشنطة كبيرة = The bag is big
• الشنطة مش كبيرة = The bag is not big

So for nominal sentences in Egyptian, مش is extremely important.

Yes, but the given order is the most straightforward and neutral.

The normal pattern is:

• تكلفة التصليح كبيرة

This starts with the topic/subject-like part:

• تكلفة التصليح = the cost of the repair

and then gives the comment:

• كبيرة = is high/big

You may hear different word orders in Arabic for emphasis, but for a learner, this version is the best default.

This is a very common learner question.

The final ة is called tāʾ marbūṭa.

By itself, it often sounds like -a:

• تكلفة → taklifa

But when the word is connected to another noun in an iḍāfa, the t sound appears:

• تكلفة التصليح → taklifet et-taSliiH

So:

• alone: taklifa
• in this phrase: taklifet...

This is normal and very important to get used to.

A very natural way is:

• تكلفة التصليح كبيرة أوي

Here أوي means very in Egyptian Arabic.

You could also say:

• تكلفة التصليح عالية أوي
• تكلفة التصليح غالية أوي

All are natural, depending on the nuance you want.