Технический надзор обязателен вне зависимости от объёма работ.

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

So:

• Технический надзор обязателен
  literally works like Technical supervision [is] mandatory.

This is completely normal Russian. You would only use forms of быть in the past or future, or in special stylistic cases.

Compare:

• Он врач. = He is a doctor.
• Надзор обязателен. = Supervision is mandatory.
• Надзор был обязателен. = Supervision was mandatory.

So the missing is is not missing at all from a Russian point of view.

Обязателен is the short form of the adjective обязательный.

Russian often uses:

• the full form of adjectives when they describe a noun directly
• the short form when the adjective acts as the main predicate of the sentence

Here, обязателен means something like is mandatory.

Compare:

• обязательный надзор = mandatory supervision
  (full form adjective before a noun)
• надзор обязателен = supervision is mandatory
  (short form adjective as predicate)

This is a very common pattern in Russian:

• важный вопрос = an important question
• вопрос важен = the question is important

So in this sentence, обязателен is exactly the expected form.

That ending shows the short-form masculine singular adjective.

The noun надзор is:

• masculine
• singular

So the short adjective must agree with it:

• masculine singular: обязателен
• feminine singular: обязательна
• neuter singular: обязательно
• plural: обязательны

Examples:

• Проверка обязательна. = The inspection is mandatory.
  (проверка is feminine)
• Согласование обязательно. = Approval is mandatory.
  (согласование is neuter)
• Документы обязательны. = The documents are mandatory.
  (документы is plural)

It is a noun phrase made of:

• технический = technical
• надзор = supervision / oversight

The main noun is надзор, and технический agrees with it:

• masculine
• singular
• nominative

So:

• технический = masculine singular nominative adjective
• надзор = masculine singular nominative noun

Because this phrase is the subject of the sentence, nominative is what you would expect.

Yes, вне зависимости от is basically a set expression meaning regardless of or irrespective of.

You can think of it literally as something like:

• outside dependence on ...

But learners should mostly treat it as one chunk:

• вне зависимости от чего-либо = regardless of something

It is common in formal, bureaucratic, legal, and technical Russian.

A very similar expression is:

• независимо от = regardless of

For example:

• вне зависимости от погоды = regardless of the weather
• независимо от погоды = regardless of the weather

Both are correct, though вне зависимости от often sounds a bit more formal.

After от, Russian normally uses the genitive case.

So:

• от объём ❌
• от объёма ✅

The dictionary form is:

• объём = volume, scope

Its genitive singular is:

• объёма

That is why the phrase is:

• вне зависимости от объёма = regardless of the volume/scope

Here работ is the genitive plural of работа.

The phrase is:

• объём работ = volume/scope of work(s)

Why genitive plural? Because объём often takes a dependent noun in the genitive, like English the volume of work.

So the structure is:

• объём = volume / scope
• работ = of works / of tasks / of work items

This is a very common Russian construction in formal and technical language.

Compare:

• объём информации = amount of information
• объём данных = volume of data
• объём работ = scope of work

Even though English often just says work as an uncountable noun, Russian frequently uses работы / работ in the plural when talking about jobs, operations, or work items.

Because there are two layers of grammar here.

1. от requires genitive:

   • от объёма

2. объём itself takes a genitive complement:

   • объём работ = scope of work

So when you combine them, you get:

• от объёма работ

That means:

• объёма is genitive because of от
• работ is genitive because it depends on объём

This kind of stacking is very normal in Russian.

Yes. Russian word order is flexible, though not random.

The neutral formal version is:

• Технический надзор обязателен вне зависимости от объёма работ.

You could also see:

• Вне зависимости от объёма работ технический надзор обязателен.

This puts more emphasis on the regardless of the scope of work part first.

Both are grammatical. The original version sounds very natural and formal.

Yes, very much so.

The vocabulary and structure are typical of:

• regulations
• contracts
• construction documentation
• technical standards
• official instructions

Clues that make it sound formal:

• технический надзор
• обязателен
• вне зависимости от
• объёма работ

In everyday speech, a person might choose simpler wording, but in official writing this sentence sounds perfectly normal.

Yes, there are two details learners often notice:

1. ъ (the hard sign)
2. ё

The dictionary form is объём.

Why the hard sign? Because it comes after a prefix-like element and before ё, which keeps the y sound:

• объём is pronounced roughly like ob-yom

Without the hard sign, the pronunciation would be different.

Also, ё is important here, even though Russian texts sometimes write е instead of ё:

• объёма is the more precise spelling
• объема is often seen in ordinary text, but it means the same word

For learners, it is helpful to remember the standard form as объём / объёма.