What is not in the hall quotation: utility contribution, water contribution and the connection

Aquotation for a hall and the price of a hall are not the same thing. Investors regularly sign the contractor’s quotation, work out that it fits, and then, during the procedure, receive two decisions nobody mentioned: the utility contribution and the charge for connection to the power grid. Neither is paid to the contractor, neither is in his quotation, and both are mandatory. A third, the water contribution, was abolished in 2024 — but old quotations and other people’s calculators still charge it, so it too is in this text. This text shows how they are calculated, where you can lawfully save on them, and why the height of a hall costs more than anyone expects.

How much the public charges for your hall come to

The calculator works out three items that never appear in a contractor’s quotation. All three have a prescribed formula, so they are not estimated but calculated — the only thing you have to find out is the unit value of the utility contribution in your zone, because every town sets it by its own decision. Call the administrative department for utility management and ask for that one figure.

The utility contribution: the bill comes per cubic metre, not per square metre

This is the biggest oversight in planning a hall. The Utility Management Act (NN 68/18, 110/18, 32/20, 145/24) prescribes in Article 81 that the utility contribution for buildings is calculated by multiplying the volume in cubic metres by the unit value of the zone. Not by the footprint. And a hall is a building with an enormous volume in relation to its floor area.

A detail that surprises even those who know the rule: the volume is measured to the upper level of the roof, not to the eaves. That is what the Ordinance on the method of determining the volume and area of buildings (NN 15/19) prescribes, and it also says that foundations, eaves overhangs, cornices and roof projections are not counted in. In practice: a hall with the same footprint but two metres more height pays a proportionally higher contribution. Every metre of height you do not need you pay for twice — once in steel, once in the contribution.

How much money that is depends on your town, because the unit value is set by a decision of the unit of local self-government (Art. 78). The Act lays down only the upper limit: under Article 79 the unit value for the first zone may not exceed 10 % of the average cost of building one cubic metre of a building in Croatia. The ministry publishes that figure in the official gazette Narodne novine and it currently stands at 1,382.86 kn/m³ (183.54 €/m³) from NN 98/18 — hence a ceiling of 18.35 €/m³. In smaller towns and industrial zones the actual values are several times lower than that ceiling.

The water contribution: abolished — and old quotations still charge it

This is the shortest and most valuable piece of news in the whole article: the water contribution has been abolished. With the amendment to the Act on the Financing of Water Management (NN 36/24) the obligation ended on 1 April 2024 — for all buildings, regardless of use, zone and height. In the calculation of a hall that item today comes to exactly 0 €, and a certificate of a paid water contribution is no longer a condition for issuing a building act.

Why do we write about it at all? Because the abolished contribution still turns up in bills of quantities. Older calculators, quotation templates and articles — including the first version of this text — worked it out under the Regulation that applied until 2024. If a quotation or a hall consultant still charges you a water contribution today, that is a sure sign that the calculation was not made under the rules in force — and it is worth checking what else in it is out of date.

The power connection: the item measured in kilowatts

The connection charge is calculated simply — connection capacity times unit price. From 1 May 2026 those prices are 193.00 €/kW on low voltage and 96.50 €/kW on medium, excluding VAT, under the Decision on the amount of the unit charge for connection to the grid (NN 45/2026). A hall with a hundred kilowatts of connection capacity on low voltage pays 19,300 € plus VAT for the connection alone.

Two notes from practice. First: that is the lower limit — if the actual cost of building the connection substantially exceeds the calculation, the actual cost is paid. Second: the connection capacity is a design figure, so it is set in the electrical part of the design. Oversized capacity is paid for at once and stays paid for; undersized capacity is paid for later and more dearly. This is one of the places where the designer earns his fee.

What else is not in the contractor’s quotation

Do you need an energy performance certificate? Probably not

This is an item investors budget for without needing to. In Article 8, the Ordinance on the energy audit of buildings and energy certification classifies industrial buildings, workshops, agricultural buildings and buildings heated to a temperature below 18 °C as buildings with low energy needs. The certificate is needed only for the heated part that is heated to 18 °C or more — and then only if that part is at the same time larger than 10 % of the total gross area and not smaller than 50 m².

In practice: an unheated store does not need a certificate. A production hall with a small heated office most often does not need one. A hall with a larger office annexe does need one — but only for that annexe. A note on the date: since 1 January 2026 the new Act on Energy Efficiency in Buildings has been in force, so before you rely on this, check whether a new ordinance has been adopted in the meantime.

If you are aiming at an EU call, the design starts much earlier

The most expensive mistake in timing: the investor waits for the call to be published and only then starts the design. That does not work. In calls for investment in the processing of agricultural products, a final building permit was required already at the moment the application was submitted, with an express note that adding it later is not possible. Submitted with it were also the main design with all its folders and a bill of quantities produced on the basis of that design, both certified by an authorised designer.

Since the road from an enquiry to a final permit realistically takes months — we have broken it down into phases — an investor aiming at a call has to start designing six to twelve months before the expected publication. The conditions differ from call to call: with some LAG calls a designer’s statement is allowed instead of the permit. Always check the annex of the specific call, because the rule changes.

The hall in the accounts: 5 % or 10 % a year

For tax purposes a hall is a building. In Article 12, the Profit Tax Act prescribes for buildings a service life of 20 years and an annual depreciation rate of 5 %, with the express possibility of doubling the rates — hence up to 10 % a year, that is a write-off over ten years. Depreciation is recognised from the first day of the month following the month in which the building is put into use.

A common misconception worth dispelling: a steel hall does not get a faster rate because it is prefabricated. A faster write-off is possible only by doubling the rate for a building. The equipment inside the hall is another story and has its own rates.

If you are planning a hall, send us the dimensions, the use and the location — the structure and the envelope we can calculate, and for the public charges in this text you now know where to ask. What the quotation must state and an enquiry with dimensions.