Data on enterprises with more than 49 employees classified to the construction section are collected by a full-scale survey, that on enterprises with 5–49 employees by a sample survey. Grossing up is the estimation of averages based on multiplying up along with the determination of the standard error. Estimates on enterprises with less than 5 employees are calculated form data of in-year VAT declarations and monthly statistics reports. Data on territorial units are referring to enterprises with more than 4 employees.

Construction activity is observed according to two aspects separated from one another: character of implemented works (TEÁOR’08) as well as type of the implemented construction (Building Register).

NACE (TEÁOR) classification: division of construction of buildings (TEÁOR’08 41), in addition to building of complete constructions, includes project organization activities on building construction. Division of civil engineering works (42) includes building of complete constructions of civil engineering works. Specialised construction works (43) can be carried out on buildings and civil engineering works.

Data by main groups of buildings show the value and the volume of construction activities performed on civil engineering works irrespective of the character of the performed works.

Because of the above mentioned, data according to sectors and main groups of buildings can differ from each other.

**Building:** such structurally separate construction that forms a space, which, with building structures, is partially or wholly enclosed from the surrounding space.

**Civil engineering works:** all other constructions not qualified as a building (roads, railways, water facilities, wires, etc.).

**Own-account construction:** Activity performed by personnel as well as contract staff, by own or rented machines, which is aimed at building new constructions, enlarging, transforming, demolishing as well as maintaining existing constructions.

**Volume index of construction production:** It reflects changes in the value of construction activity at comparative prices of the reference period.

**Total orders:** value of orders concluded, as a main contractor, by construction enterprises and customers, received and confirmed by a construction enterprise that is classified to the construction-installation activity in a written form at the end of the reference month.

**New orders:** value of all construction contracts, received and confirmed in the reference month irrespective of whether implemented or not.

**Volume index of contracts:** reflects changes in the value of contracts at comparative prices of the reference period.

Released data are preliminary, because of data corrections may differ from previously released ones. Corrected data are released in publications for the reference months of March, June, September and December. This time data on the reference year are revised and modified from the beginning of the year. We depart from this practice only in a justified case e.g. when a significant error is detected, in this case a data revision is carried out and we publish the corrected data in the next first release. Prior year’s final data are determined in July-August every year. These data are released in the first release for the reference month of July. This time reference year indices may change along with the base year’s 12 month volume index and value data.

#### Construction producer price index

**Construction producers’ price index**: reflects the average price development of construction activity performed in construction branch. The indices are based on the survey of market prices of selected construction operations.

**Price indices by type of building**: reflects the average price development of construction operations need to build the given type of construction.

**Unit price of the construction operations:** the prices of the selected operations, including material and fee prices without VAT. These prices are taken from the entrepreneur fee establishing budgets of the contracts’ and contracts modifications’ from the reference period.

**Calculation method**: The basic element of the calculation is the elementary price relative by representatives, which is the quotient of the construction operation’s reference and base period prices. From these quotients first we calculate – using arithmetical averages – enterprise indices; subsequently sub-branch and branch indices aggregated from enterprise indices weighted by staff size categories and main groups of construction. The construction price index is computed from the branch indices. Production values from two years before the reference year are used as weights. To compute indices of types of constructions first price indices for each selected operation are calculated as the simple arithmetical mean of elementary price relatives, subsequently the indices of the construction operations are weighted by types of constructions. The weights used for the types of constructions were made to be compiled by specialists, who collected weight proportions from the costs of selected construction projects.

**Source of data:** data supply of “Prices of construction activities”.

**Scope of data suppliers:** designated enterprises classified to the construction industry (a total of 900).