Turkish Statistical Institute (TURKSTAT)

Short Term Statistics Department

Turkish Statistical Institute (TURKSTAT) Necatibey Cad. No:114  Çankaya/ANKARA

Construction Cost Index (CCI): Price index that measures of the changes in construction costs in terms of labor and materials by months

The Statistical Classification of Products by Activity (CPA Version 2.1) is used for CCI.

F. Construction 

    41 Buildings

41.00.1 Residential building

41.00.2 Non residential buildings 

    42 Civil Engineering 

42.1 Roads and railways 

42.2 Utility projects 

42.9 Other civil engireering projects 

Substance weights used in the calculation of the construction cost index for the 2015 base year are calculated by using the input amounts determined by analyzing the approximate cost and final account files of the construction projects obtained from various public institutions and organizations and the unit prices of the year 2015.
 
In the weighting of building types, building registration data is used for buildings and National Account data is used for civil engineering.

Observation unit: Price indices and administrative data

Reporting unit: Index and changes of monthly and yearly

In the calculation of the new series with 2015 = 100 base year and current weight structure, Domestic Producer Price Index, Consumer Price Index and Social Security Institution administrative data are used in the bottom detail.
 
In order to determine the material and workmanship and their weights, 77 construction projects were analyzed to represent construction types, resulting in about 2,300 products and weights. The cost index is calculated for each type of structure resulting from matching these products with the related price index in the lowest detail.

Turkey

1991=100 based Bulding Construction Cost Index was first used in November, 1992.

2005=100 based Bulding Construction Cost Index was first used in April, 2007.

2015=100 based Construction Cost Index was first released in March,2018.

2015=100

Indices and percentage changes.

Reference period is monthly.

Turkish Official Statistics Law No 5429  was accepted on  10 November 2005, is the legal base of all  our statistics.

COUNCIL REGULATION (EC) No 1165/98 of 19 May 1998 concerning short-term statistics.
REGULATION (EC) No 1158/2005 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 6 July 2005 amending Council Regulation (EC) No 1165/98 concerning short-term statistics.
COMMISSION REGULATION (EC) No 1503/2006 of 28 September 2006 implementing and amending Council Regulation (EC) No 1165/98 concerning short-term statistics as regards definitions of variables, list of variables and frequency of data compilation
REGULATION (EC) No 1893/2006 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 20 December 2006 establishing the statistical classification of economic activities NACE Revision 2 and amending Council Regulation (EEC) No 3037/90 as well as certain EC Regulations on specific statistical domains.
- REGULATION (EC) No 223/2009 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 11 March 2009 on European statistics and repealing Regulation (EC, Euratom) No 1101/2008 of the European Parliament and of the Council on the transmission of data subject to statistical confidentiality to the Statistical Office of the European Communities, Council Regulation (EC) No 322/97 on Community Statistics, and Council Decision 89/382/EEC, Euratom establishing a Committee on the Statistical Programmes of the European Communities.

Data are transmitted to Eurostat only.  (for residential buildings construction cost index)

All statistics collected and published by TURKSTAT are governed by the Turkish Statistical Law no. 5429, of 10 November 2005.
Under the terms of the Statistical Law:
1. TURKSTAT has the independence to determine the methodology and release dates of statistics for which it is responsible.
2. Data are collected only for statistical purposes and confidentiality is assured.
3. The confidentiality of individual responses is guaranteed.
4. The TURKSTAT logo is used on all statistics published under the law.
5. The public dissemination of economic statistics is required.

Weights of prices of items are confidential.

At the end of each year TURKSTAT publishes a release calendar providing the release dates for the coming year. This is also disseminated on TURKSTAT’s internet website (www.turkstat.gov.tr).

http://www.turkstat.gov.tr/ingtakvim/tkvim.zul#tb1

The news releases are made available on the Turkish Statistical Institute (TURKSTAT) website http://www.turkstat.gov.tr/

There is no access to the data before the release.

Monthly

No ministerial commentary is attached to the release of data by the statistics office .Under the Statistical Law, any data product prepared under that law must be identified. Technical commentaries prepared by TURKSTAT accompany the press release., http://www.turkstat.gov.tr/PreHaberBultenleri.do?id=27743 is the link for the press release.

Name of national paper and electronic publications: Construction Cost Index

Online database is available. You can access from https://biruni.tuik.gov.tr/medas/?kn=143&locale=en

Not available.

None.

Methodology and sources used in statistical compilation are disseminated on the Turkish Statistical Institute (TURKSTAT) website (http://www.turkstat.gov.tr/).

Not available.

The quality of statistical information and its production process is ensured by the provisions of the European Statistics Code of Practice.

The quality of the data corresponds requirements of accuracy, timeliness and punctuality, comparability and compatibility, statistical reports used to collect statistical data were tested.

The main users of statistical information are Eurostat, state institutions and agencies, international organisations, the media, business and research communities, students, whose needs are satisfied without a breach of the confidentiality principle.

Not available.

The index is broken down into three groups of costs: Labour, Materials, Total

The index is released in 8 division in accordance with CPA 2.1:

• F. Construction        
• 41 Buildings
• 41.00.1 Residential building
• 41.00.2 Non residential buildings
• 42 Civil Engineering
• 42.1 Roads and railways
• 42.2 Utility projects
• 42.9 Other civil engireering projects

Eurostat's requirements in term of time series are fulfilled. Moreover, CCI actually meets the Turkish users needs of information

Received CCI (Construction Cost Index) results are analyzed, looking for errors, which may affect the final results. Outliers are determined by using SAS programme, and some computings are made by using excel and SAS together. Price indices and administrative data provide quality checked data for CCI.

CCI are derived from D-PPI, CPI and administrative data. The size of statistical error is not calculated.

The non-sampling error is not calculated.

Publication is released 51-53 days after the end of the reference month.

The news releases are published according to the announced release calendar.

Turkey CCI  is produced only on the whole country level.

TurkStat calculates CCI since 2018. Time series of BCCI breaks are he following:

• 1991-2006; base 1991
• 2005-2017; base 2005
• 2015- ; base 2015

Coherence is insured for Labour cost since data derived by the administrative data from Social Security Institution; materials costs are collected by PPI and CPI.

CCI is internaly coherent. Lower level price indices are aggregated to the higher level indices and the total CCI.

There is no responder burden. In calculating process, current price indices and administrative data are used.

Data are not subject to revision.

Not avaliable

Type of source Different types of sources are used. Material prices are mainly colleçted from Domestic Producer Price Index and Consumer Price Index. Labour costs are derived from administrative source: Social Security Institution

Frame on which the source is based Weights for types of construction and items used in compilation of 2015 based CCI were calculated evaluating bill of quantities obtained from various public institutions and organizations(eg.Housing Development Administration, The General Directorate of Highways) with 2015 unit prices.

Criteria for stratification  Not applicable

Threshold values and percentages  Not available

Frequency of updating the sample Sample is updated every 5 years.

Data are collected monthly.

Questionnaires are not used in the survey. In the calculation of the new series with 2015 = 100 base year, Domestic Producer Price Index, Consumer Price Index and Social Security Institution data are used.

The experts of the CCI carries out the first verification and editing as well as validation of the data using the SAS programme. Data are compared to the data of previous periods. Reasons of changes in the prices of cost items are analysed. Before computing the index, data are quality-checked by observing both levels and rates of change.

The CCI is computed by applying  Laspeyres formula with fixed base year (2015=100). It is not a chained index. 

Not available

None.