Смета слишком высокая.

Смета usually means a cost estimate, budget estimate, or itemized estimate, especially in contexts like construction, repairs, projects, or accounting.

So it is not just any kind of estimate in the broad English sense. It is more specifically an estimate of expected costs.

In Russian, the verb to be is normally omitted in the present tense.

So:

• Смета слишком высокая. = The estimate is too high.

Literally, it looks more like:

• Estimate too high.

This is completely normal Russian grammar.

Because высокая agrees with смета, and смета is:

• feminine
• singular
• nominative

The dictionary form of the adjective is высокий.

Its nominative forms are:

• masculine: высокий
• feminine: высокая
• neuter: высокое
• plural: высокие

Since смета is feminine singular, you need высокая.

Both смета and высокая are in the nominative singular.

• смета = nominative singular noun
• высокая = nominative singular feminine adjective agreeing with смета
• слишком = adverb, so it does not change

This is the normal pattern in simple present-tense sentences like this.

Yes. Russian uses высокий / высокая for things like:

• prices
• rates
• numbers
• costs
• estimates

So высокая смета works just like a high estimate in English.

If you said большая смета, that would sound different. It might suggest a large estimate in size or scope, not necessarily that the amount is too high.

Слишком means too, in the sense of more than acceptable / more than desired.

So:

• Смета слишком высокая. = The estimate is too high.

If you use очень, it means very:

• Смета очень высокая. = The estimate is very high.

That is an important difference:

• слишком = negative excess
• очень = strong degree, but not necessarily negative

Yes. That is also correct.

Russian has two common ways to say this kind of thing:

• Смета слишком высокая.
• Смета слишком высока.

The version with высокая uses the full adjective form and sounds very natural in everyday modern Russian.

The version with высока uses the short adjective form. It is also normal, but can sound a little more formal, concise, or stylistically marked depending on context.

For a learner, Смета слишком высокая is a very safe and natural choice.

Yes, but the emphasis changes.

The most neutral order is:

• Смета слишком высокая.

If you say:

• Слишком высокая смета.

that often sounds more like a noun phrase: a too-high estimate, or an elliptical comment like Too high an estimate.

So the original sentence is the best neutral full statement.

Russian does not have articles.

So Смета слишком высокая can mean:

• The estimate is too high
• sometimes An estimate is too high, depending on context

In real use, context tells you whether the meaning is definite or indefinite. In most situations, English will translate this as The estimate is too high.

The grammar is completely normal and natural. The only thing that may sound a bit specialized is смета, because it is often used in professional or practical contexts such as:

• construction
• renovation
• project planning
• budgeting

So the sentence itself is natural, but the noun смета belongs especially to cost-estimate or budget-estimate situations.