Reference metadata describe statistical concepts and methodologies used for the collection and generation of data. They provide information on data quality and, since they are strongly content-oriented, assist users in interpreting the data. Reference metadata, unlike structural metadata, can be decoupled from the data.
Institutul National de Statistica (INS) Bulevardul Libertatii 16, Bucharest 5 RO-050706
1.6. Contact email address
Confidential because of GDPR
1.7. Contact phone number
Confidential because of GDPR
1.8. Contact fax number
Confidential because of GDPR
2.1. Metadata last certified
5 June 2025
2.2. Metadata last posted
5 June 2025
2.3. Metadata last update
5 June 2025
3.1. Data description
Volume index of production in construction (IPC) is applied for measuring changes in the value of construction in a monthly periods with referance to the base year period and with a breakdown into building and civil engineering works as well as into new construction works, capital repairs and maintenance works and current repairs.
3.2. Classification system
NACE Rev. 2 and CPA classification
3.3. Coverage - sector
CANE Section F (compatible with NACE Rev. 2 Section F) and CPA. All size classes are covered, excepting units with less than 4 employees.
3.4. Statistical concepts and definitions
The index of production in construction is based on the value of the work carried out by the units during the reference period. It includes new work, repair and restoration for residential buildings, non residential buildings and civil engineering. It collects also data about new orders in construction for residential buildings, non residential buildings and civil engineering. Volume indices are compiled, using construction costs indices as the deflator. Definition of indices of production of building construction and civil engineering are compliant with Eurostat recommentations and EBS manual.
3.5. Statistical unit
KAU
3.6. Statistical population
The sampling frame used for the sample selection is drawn from the Romanian Business Register (REGIS), which contained all enterprises, authorities and organisations as well as their local units that carried out any economic activity irrespective of their size or if they belong to the private or public sector. The Business Register is updated, yearly, on the balance sheets and contains the latest information on each enterprise in the statistical population such as the identification items (unique identification code, address etc.), economic activity codes (NACE Rev.2), number of employees (giving the enterprise size class). There are around 2800 units which are surveyed each month.The total population is 50000 units.
3.7. Reference area
All regions of Romania are covered. No data of statistical units that are located abroad are included.
3.8. Coverage - Time
The time series according to NACE rev.2 is available from 2005.
3.9. Base period
2021=100
In percentage %.
Monthly
6.1. Institutional Mandate - legal acts and other agreements
REGULATION (EU) 2019/2152 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 27 November 2019 on European business statistics, repealing 10 legal acts in the field of business statistics and COMMISSION IMPLEMENTING REGULATION (EU) 2020/1197 of 30 July 2020 laying down technical specifications and arrangements pursuant to Regulation (EU) 2019/2152 of the European Parliament and of the Council on European business statistics repealing 10 legal acts in the field of business statistics: UE Regulations
According to Law no. 226/2009 all individuals and legal units are required to submit data to the INS on request. Sanctions are possible but the INS prefers to use persuasion to gain the necessary data.All statistical data are collected on the basis of national legal acts approved by Romanian Government ( i.e. the " Programme on Statistical Surveys of Official Statistics).
6.2. Institutional Mandate - data sharing
Data are transmitted to the OECD, UN and IMF.
7.1. Confidentiality - policy
All statistics collected and published by INS are governed by the statistical Law no. 226/2009 regarding the organisation of official statistics. The Law specifies that: the official statistical services are authorised to ask for and receive free of charge statistical data and information from all natural and legal persons who are located, hold any kind of capital or carry out any type of activity on the Romanian territory. Also under the provision of this law, INS cannot publish, or otherwise make available to one individual or organisation, statistics that could enable the identification of data for any individual person or entity. INS has been repeatedly and publicly recognised by the government as fully intellectually independent: it decides by itself which data to collect, which methodology to use, and which results, methodological notes and commentaries are published. Under the provision of the statistical law, INS cannot publish, or otherwise make available to one individual or organisation, statistics that could enable the identification of data for any individual person or entity. No government official outside the National Institute of Statistics has access to the data before release to the public. The most important aspects on the organisation of the official statistics in Romanian are posted on the National Institute of Statistics Internet website NIS website. Copies of the statistical laws are available in Romanian from the library of the National Institute of Statistics, 16, Libertatii Avenue, Bucharest, District 5.
7.2. Confidentiality - data treatment
The data are not considered to be confidential.
8.1. Release calendar
There is an advance release calendar of data dissemination which can be found on the website Release calendar The results of the monthly survey are disseminated at M+49 days by press release and via INS Internet website Release calendar and published at M+57 days in the Monthly Statistical Bulletin. The data can be found also in the TEMPO data base TEMPO online
8.2. Release calendar access
The release calendar is available on the NIS website Release calendar
8.3. Release policy - user access
Monthly data are available to all users simultaneously at the time of release through the press release and via INS Internet website Release calendar
No organisation or person outside the INS has pre-release access to the published data. Data are transmitted monthly to Eurostat as indices by e-DAMIS using SDMX format within 45 days (calendar days) from the end of the month.
Monthly
10.1. Dissemination format - News release
The results of the monthly survey are disseminated at M+49 days by press release on NIS website NIS website. No ministerial commentary is included in any of the statistical releases.
10.2. Dissemination format - Publications
Data for index on production in construction are published in the "Buletin Statistic Lunar (Monthly statistical bulletin); Seria Investitii-Constructii (Quarterly investment and construction series). All statistical publications are available also in electronic format. Data about construction work are published as an index by elements of structure: new construction works, capital repair works, maintenance and current repair works, as well as by construction type: residential and non residential building, civil engineering.
10.3. Dissemination format - online database
The construction production index are available also in our on line data base TEMPO TEMPO online which is available both in Romanian and English.
10.4. Dissemination format - microdata access
No microdata are disseminated.
10.5. Dissemination format - other
Data on production in construction are sent monthly to Eurostat both to be used in European aggregates as well as to be released as national data.
10.6. Documentation on methodology
Brief details of the methodology are included with the published data.
10.7. Quality management - documentation
The statistical process is monitored regarding relevance , accuracy, timeliness, punctuality, coherence and comparability.
The documentation on quality management is available on the NIS website
The system of official statistics follows international and European quality standards. NIS Romania has adopted the UN Fundamental Principles for Official Statistics as well as the European Statistics Code of Practice.
11.2. Quality management - assessment
The documentation on quality management is available on the NIS website
Data are relevant because are required by Europen legislation.
The main national users are grouped as following: Presidential administration, Governmental bodies; National Commission for Prognosis; mass-media; other users. Internal users: Directorate „Macroeconomic statistics“.
Their main needs:The Monthly Survey on Short-Term Statistics outcomes, in relation with the information provided by other surveys, are used by policy makers in establishing the actions and measures for economic development strategies.
12.2. Relevance - User Satisfaction
NIS Romania has conducted general surveys of user satisfaction in 2024, and plans to continue doing so every three years. The purpose is to know the perception of users regarding the quality of the information they use and if their needs are covered.
The users’ specific needs are considered when methodological revisions are carried out in order to tailor the content of the survey to the specific requirements of its users, thereby increasing their levels of satisfaction.
The publication can be found at the following link:
Data are compliant with European legislation and Eurostat requirments. All breakdowns and variable forms are provided, according to the EU regulations in force.
13.1. Accuracy - overall
There are negligible non sampling errors concerning coverage, measurement and non response.
The response rate in 2024 was around 83.5%.
13.2. Sampling error
There is an exaustive survey for enterprises employing 50 persons and more. For the remainder a sample is drawn. Units with less than 4 employees are excluded.
13.3. Non-sampling error
Usually the typing errors could appear in the processing stage and the data are revised the next month. The difference between initial figures and revised figures represents about +/-3% of the initial figures for total construction index , gross series.
14.1. Timeliness
All the activities carried out by INS during a year are scheduled through the Activity Plan with several months earlier. Annually, INS issues for the users a press release calendar and a catalogue of statistical products and services containing the names, periodicity, short descriptions and release dates for all publications. The press release is issued 49 days after the end of the reference month. The publication is ready within 54 days from the end of the reference month. The questionnaires are prefilled with identification data about reporting units and sent to them at the beginning of each quarter of the year. The enterprises are requested to answer by the 25th day following the reference month. Data collection is normally closed 2 days before publication.
14.2. Punctuality
The process concerning the deadlines for the respondents to reply was performed as follows:
the units have to fill in the paper questionnaires and send them to the territorial statistical offices until 15th of the month following the reference month.
the units can also fill in the on line questionnaires until around 25rd of the month following the reference month.
The process concerning the covering recalls and follow-ups was performed as follows:
from 15th till the 25th of the month following the reference month, the territorial statistical offices had to perform data entry and data checking.
In this phase, the covering recalls and follow-ups are taking place. The statisticians from the local offices contact or re contact the units/respondents who did not sent the data, irrespective of their size classes, but the stress was more on the enterprises with more than 50 employees, who are exhaustively surveyed and on those from the public sector. Since not all respondents comply with the deadline requested, a small proportion of questionnaires reach with delay the territorial statistical offices.
Data processing steps and the related periods were:
At local level (regional/county statistical office) the data processing consisted in:
data collection – until 15th of the following month of the reference month;
data entry and validation- from 15th of the following month of the reference month till the 25th day of the month;
At central level (INS) the data processing consisted in:
data validation – errors were detected and sent for correction or explanations to the statistical offices;
comparative analysis with the previous month, the same month of the previous year and with other data sources (surveys and administrative data);
the analysis of the non-weighted data;
the weighting procedures;
the analysis of the weighted data;
data tabulation;
monthly data preparation for dissemination in the press releases, the Monthly Statistical Bulletin, the TEMPO (on-line) database;
transposing into the STS standard format for data transmission designed by Eurostat;
transmission of final results to Eurostat.
The publication dates for the monthly indicators were disseminated in accordance with the legal requirements as follows:
European level (Eurostat): M+47 of each month;
National level:
Press releases - M+49 of each month;
Monthly Statistical Bulletin (MSB) - M+57 and TEMPO data base - M+49 of each month.
15.1. Comparability - geographical
Indices are representative for the whole country; they are not representative by regions of the country. NSI applies methodology, which is in line with international standards. In this sense, the comparability of the indicators across countries can be considered as very good.
15.2. Comparability - over time
No major methodological changes over the last 10 years.
15.3. Coherence - cross domain
Confrontation is made with the annualy SBS data. Usualy the monthly data are not revised as a result of confrontation but some revision of data could be done when we change the base year as a result of confrontation with annual SBS data.
15.4. Coherence - internal
All data are coherent at different aggregation levels by elements of structure and types of construction and total construction.
Number of units =2800;
Cost (NSI) hours per year= 12950
Burden (respondents) hours per year= 17520
17.1. Data revision - policy
Data revisions follow the Revision Policy of the NIS Romania, which represent one of the key documents of the office. The same revision policy is applied to STS data released nationally and transmitted to Eurostat.Calendar of standard revisions is being prepared together with the release calendar. Revision policy
1. Routine revisions: The revised indices are published together with the preliminary indices for the following month. Notice is given at the time the change is introduced.
2. Major revisions: In the case of regular index rebases (as a rule every five years), the results and changes in the calculation methodology or major changes as classification notice are presented in detail in the Monthly Statistical Bulletin and on the NIS website well in advance of the change.
3. Non scheduled revisions: In case of errors correction are made without waiting for scheduled revisions.
Vintage database are not available.
17.2. Data revision - practice
The practice of data revision corresponds to the following policy:
The data are preliminary when first released and are revised three months after the end of the reference month.
The quality indicators used in data revision are: MR (Mean Revision) and MAR (Mean Absolute Revision).
MR and MAR values were obtained with the information of its last 36 final months being December 2024 the last one.
The Mean Revision values of the differences between the general index first released and the last version, gross series, in the period January, 2022 to December, 2024 (36 months)
for WDA MR= 0.24167
And the Mean Absolute Revision for this period,
for WDA MAR=0.34167
The difference between initial figures and revised figures represents about +/-3% of the initial figures for total construction index , gross series.
Major changes in methodology are announced in all statistical publications at the time of the change.The status of data is clearly indicated in the publications.
18.1. Source data
Statistical survey. The frame used for sampling is business. There is a stratified sample survey. The sample is updated annualy.
Around 2,800 units are surveyed each month.
18.2. Frequency of data collection
Data are collected monthly.
18.3. Data collection
One combined questionnaire regarding value of construction works, main groups of construction materials used in construction works, number of employees, wages and salaries, investment is used. (CON TS – Short term indicators in construction in month ……, Chapter VAL Value of the construction works). Data are collected in principal using a web questionnaire. For the rest of the respondent units paper questionnaire or electronic format by e-mail is used. The paper questionnaires are sent to the reporting units and then collected by county statistical offices. From 2010 onwards data are collected online using the eSOP portal for statistical data collection.
18.4. Data validation
The IT solution for Monthly survey on short-term statistics was developed to find out the measurement and processing errors occurred in different stages of the survey. The application was designed for on line data collection and validation.
The IT solution allowed to perform on line data entry and validation at unit level. Also, the IT solution allowed to perform data entry and validation for questionnaires received on paper by post/email at county level (42 counties in total – NUTS3 level).
The IT solution contained the following categories of logical tests that check:
the primary data from the questionnaires;
the logical flows among the questionnaire chapters;
the data integrity and correctness;
the data comparability with the previous month.
The logical tests have the scope:
to follow and check the logical flows of the questionnaire;
to correlate data from related chapters of the questionnaire;
to define and check certain limits to which the indicators should belong compared to their evolution over time and between them;
to find out the outliers or non-logical values.
The tests for data integrity check the identification information from the sample of units with the information from respondent files.
At central level more accurate and detailed procedures were developed using Visual Fox for checking data integrity and correctness:
data comparison with the previous and corresponding months;
non-weighted procedures;
data tabulation;
automatic transformation of final results into the STS standard format designed by Eurostat;
data transmission to Eurostat.
Logical tests were performed for data checking and correlation on all the indicators collected through the survey. Since the same tests were conducted at local level (unit and county) as well as at central level, the largest part of the errors found was solved from the beginning (at local level). The figures were corrected after re-contacting the corresponding enterprises by the statistical offices.
The questionnaire design, detailed explanatory notes and the IT solution developed had as result a complete and of good quality data set.
18.5. Data compilation
Non-response is imputed using the average for the cell. If non- response is due to the closure or temporary suspension of activity, no imputation is made.The sample results are grossed up using Horvitz-Thomson estimator. Volume indices are compiled by deflating the value data with cost indices in construction separately calculated by elements of structure and types of construction.
The IPC is a Laspeyres index. Volume indices in construction are determined by deflating the value data with the cost indices in construction by work type, respectively construction object. Indices of construction works per total are calculated as weighted arithmetic mean of indices by work type or construction object. The weights used for the aggregation are calculated based on the turnover according to the results of Structural Business Survey in the reference year (2021).
18.6. Adjustment
In order to adjust the series Jdemetra + v2.2 was used (TRAMO/SEATS method) estimating the effect of the number of working days, different from one month to another and the calendar effect (leap year and other national holidays) as well as the identification and correction of outliers (occasional, transitional or permanent changes) and interpolation of missing values. Series adjusted for the number of working days was obtained by eliminating from unadjusted series those effects by means of correction coefficients set up according to the regression model used (additive or multiplicative). The regression models used for each series are set up at the beginning of each year involving the recalculation of adjusted series calculated in the previous year (recalculation due to the change in the adopted models, number of regressors used, number of available observations). Aggregated levels were adjusted by the direct method namely direct adjustment of aggregated series. Using the direct method could lead to some inconsistencies in data series (notably, aggregates may not always range between the values of their original components). The estimation of unobserved components (trend-cycle, seasonality and irregular components) is done by the SEATS program based on ARIMA models. The series adjusted for working days and seasonality is obtained by eliminating the seasonal component from the working-day adjusted series.
Volume index of production in construction (IPC) is applied for measuring changes in the value of construction in a monthly periods with referance to the base year period and with a breakdown into building and civil engineering works as well as into new construction works, capital repairs and maintenance works and current repairs.
5 June 2025
The index of production in construction is based on the value of the work carried out by the units during the reference period. It includes new work, repair and restoration for residential buildings, non residential buildings and civil engineering. It collects also data about new orders in construction for residential buildings, non residential buildings and civil engineering. Volume indices are compiled, using construction costs indices as the deflator. Definition of indices of production of building construction and civil engineering are compliant with Eurostat recommentations and EBS manual.
KAU
The sampling frame used for the sample selection is drawn from the Romanian Business Register (REGIS), which contained all enterprises, authorities and organisations as well as their local units that carried out any economic activity irrespective of their size or if they belong to the private or public sector. The Business Register is updated, yearly, on the balance sheets and contains the latest information on each enterprise in the statistical population such as the identification items (unique identification code, address etc.), economic activity codes (NACE Rev.2), number of employees (giving the enterprise size class). There are around 2800 units which are surveyed each month.The total population is 50000 units.
All regions of Romania are covered. No data of statistical units that are located abroad are included.
Monthly
There are negligible non sampling errors concerning coverage, measurement and non response.
The response rate in 2024 was around 83.5%.
In percentage %.
Non-response is imputed using the average for the cell. If non- response is due to the closure or temporary suspension of activity, no imputation is made.The sample results are grossed up using Horvitz-Thomson estimator. Volume indices are compiled by deflating the value data with cost indices in construction separately calculated by elements of structure and types of construction.
The IPC is a Laspeyres index. Volume indices in construction are determined by deflating the value data with the cost indices in construction by work type, respectively construction object. Indices of construction works per total are calculated as weighted arithmetic mean of indices by work type or construction object. The weights used for the aggregation are calculated based on the turnover according to the results of Structural Business Survey in the reference year (2021).
Statistical survey. The frame used for sampling is business. There is a stratified sample survey. The sample is updated annualy.
Around 2,800 units are surveyed each month.
Monthly
All the activities carried out by INS during a year are scheduled through the Activity Plan with several months earlier. Annually, INS issues for the users a press release calendar and a catalogue of statistical products and services containing the names, periodicity, short descriptions and release dates for all publications. The press release is issued 49 days after the end of the reference month. The publication is ready within 54 days from the end of the reference month. The questionnaires are prefilled with identification data about reporting units and sent to them at the beginning of each quarter of the year. The enterprises are requested to answer by the 25th day following the reference month. Data collection is normally closed 2 days before publication.
Indices are representative for the whole country; they are not representative by regions of the country. NSI applies methodology, which is in line with international standards. In this sense, the comparability of the indicators across countries can be considered as very good.
No major methodological changes over the last 10 years.
