Construction cost (or producer prices), new residential buildings

National Reference Metadata in Euro SDMX Metadata Structure (ESMS)

Compiling agency: Statistics Norway


Eurostat metadata
Reference metadata
1. Contact
2. Metadata update
3. Statistical presentation
4. Unit of measure
5. Reference Period
6. Institutional Mandate
7. Confidentiality
8. Release policy
9. Frequency of dissemination
10. Accessibility and clarity
11. Quality management
12. Relevance
13. Accuracy
14. Timeliness and punctuality
15. Coherence and comparability
16. Cost and Burden
17. Data revision
18. Statistical processing
19. Comment
Related Metadata
Annexes (including footnotes)
 



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1. Contact Top
1.1. Contact organisation

Statistics Norway
1.2. Contact organisation unit

Division for Construction and Service Statistics
1.5. Contact mail address

Statistics Norway, Box 1400 Rasta,2225 Kongsvinger, Norway


2. Metadata update Top
2.1. Metadata last certified 28/08/2015
2.2. Metadata last posted 28/08/2015
2.3. Metadata last update 28/08/2015


3. Statistical presentation Top
3.1. Data description
Name of indicator/source Construction cost index for residential buildings.
Construction cost index for residential buildings, material.
Construction cost index for residential buildings, labour cost.
3.2. Classification system

NACE Rev. 2.
3.3. Coverage - sector
Activities covered The index covers residential buildings and is based on two types of buildings, namely detached houses and blocks of flats.
Size classes covered Not relevant.
3.4. Statistical concepts and definitions
List and definition of variables The CCI measures the changes in the costs of input factors to the construction process of residential buildings. CCI ignores gains in productivity and changes in profit margins. The cost elements are, material costs, labour cost, machinery costs, transportation costs and other costs.
Material prices are actual prices to the construction activity, excluding VAT.
Labour costs are divided into two main components, which are calculated separately: wages and salaries for actual worked hours, and other labour costs. Other labour costs include wages and salaries for hours not worked and social security charges.
Planned changes in information collected None
Accounting conventions The data refers to the 15th of the month.
3.5. Statistical unit
Reporting unit The reporting unit is the local KAU.
Observation unit(s) Not relevant.
3.6. Statistical population

A sample of 420 suppliers to the construction industry (mainly wholesale companies provides about 3 450 price observations every month.
3.7. Reference area
Geographical area covered All regions of Norway are covered.
3.8. Coverage - Time
Date of first use as a source The index has been published since 1978.
3.9. Base period
Base (reference) year 2010


4. Unit of measure Top

The material prices are collected by means of questionnaires, which are sent to the suppliers to the construction industry (mainly wholesale companies. The labour cost are based on Statictics Norway's quarterly wage statistics and a percentage of social security charges according to wages. Machinery costs indices calculated by NTNU. Transpot costs indices compiled by Statistics Norway.


5. Reference Period Top
Reference year of this report 2015


6. Institutional Mandate Top
6.1. Institutional Mandate - legal acts and other agreements
Legal basis The Statistics Act, Sections 2-2 and 2-3.
Obligation on units to provide data Mandatory according to the Statistics Act.
Planned changes in legal basis, obligation to respond and frame used None.
6.2. Institutional Mandate - data sharing

Not relevant.


7. Confidentiality Top
7.1. Confidentiality - policy
Dissemination of terms and conditions under which official statistics are produced, including confidentiality of individual responses Information about how the statistics are produced is given as About the statistics at the website. This applies to - among other things - information about collection methods, explanation of terms and information about sources of errors.
7.2. Confidentiality - data treatment
Treatment of confidential data Not relevant.


8. Release policy Top
8.1. Release calendar
Advance dissemination of release calendar The publication schedule is pre-released in Statistics Norway's Advance Release Calendar.
8.2. Release calendar access

See planned releases at: http://www.ssb.no/en/kalender
8.3. Release policy - user access
Simultaneous release to all interested parties Statistics Norway releases statistics at its website, www.ssb.no. The statistics are released at 10.00 in Norwegian and English.
Identification of internal government access to data before release No other governmental or non-governmental bodies have prior access to data before its release.
Transmission to Eurostat and further use of the statistics Data are transmitted electronically to Eurostat within minutes after publication on the Internet.


9. Frequency of dissemination Top

Monthly


10. Accessibility and clarity Top
10.1. Dissemination format - News release
Identification of ministerial commentary on the occasion of statistical releases None
10.2. Dissemination format - Publications
Name of national paper publications In 2006 a paper publication containing results and methodology on Construction Price Indices and House Property Price Indices were published, see
http://www.ssb.no/english/subjects/08/02/30/nos_d372_en/nos_d372_en.pdf
Name of national electronic dissemination Data are published on the Internet at http://www.ssb.no/bkibol_en/
10.3. Dissemination format - online database

On the home page to the article connected to the statistical release there is also a link to statbank. http://www.ssb.no/en/table/08651

10.4. Dissemination format - microdata access

Not relevant.
10.5. Dissemination format - other
Planned changes in national dissemination methods None.
10.6. Documentation on methodology
Dissemination of documentation on methodology and sources used in preparing statistics Documentation on methodology and sources used in preparing statistics are published on the Internet at http://www.ssb.no/bkibol_en/ ("About the Statistics"). The methodology is also described in an own publication about Construction Price Indices and House Property Price Indices, see
http://www.ssb.no/english/subjects/08/02/30/nos_d372_en/nos_d372_en.pdf
Description of standard tables produced There are two standard tables published:
— construction cost index for detached houses of wood;
— construction cost index for multi-dwelling houses.
These tables present a total of 7 types of building works, each divided by two indices, one for total costs and one for materials.

The overall index for residential buildings is divided in labour costs and material costs. No regional breakdown is available.
10.7. Quality management - documentation

The prices are put through tests, which identify observations with large price changes from the previous month. Price are also checked when sorted by item and when items are aggregated into groups. Sub-indices and item-indices are checked against timeseries that are published earlier and comparisons with other statistics.


11. Quality management Top
11.1. Quality assurance
Summary description of quality criteria calculated for national purposes The prices are put through tests, which identify observations with large price changes from the previous month. Prices are also checked when sorted by item and when items are aggregated into groups. Sub-indices and item-indices are checked against time-series that have been previously published.
11.2. Quality management - assessment

Not available


12. Relevance Top
12.1. Relevance - User Needs

The CCI is used to regulate the cost of construction works. At Statistics Norway the CCI is used as ddeflator in the National Accounts. There are 2 910 subscribers to a monthly card. The subscribers are developers, contractors, builders, technical installation firms, manufacturers of prefabricated houses etc.
12.2. Relevance - User Satisfaction

Consulting choice for building and construction
12.3. Completeness

To be filled in.


13. Accuracy Top
13.1. Accuracy - overall

The outlets might, for the sake of convenience, copy the previous month's prices instead of the correct prices whwn filling out the questionnaires. The most obvious cases of this kind are revealed in a manual check carried out whwn receiving the questionnaires. When a product or service is no longer sold the outlets are instructed to find a replacement and mark it in the questionnaire. If they fail to do so, the difference in price between the old product and the replacement will incorrectly be registered as a price change of the old product. 

Skewness: the sample of goods and services is updated every fifteenth year. In addition products are replaced if an outlet no longer deliver this particular product.

Non-responce: Each month about 1 pr cent off all questionnaires are missing. Missing prices are imputed. The imputatuons are based on the average changes in prices from the previous month of the same product.
13.2. Sampling error

Sampling errors are not calculated.
13.3. Non-sampling error
Response rate Response rate is 99%.
Actions to speed up or increase the rate of response

For some goods prices measurements are based on price lists, and changes in discounts given to building contractors are not taken into account.

Price effects due to changes in relative prices. The price ratio between different goods and services has been changed over time.

Unsatifactory handling of quality changes. Statistics Norway has not initiated separate calculations of the impact of these measuring errors in the building cost indices. 


14. Timeliness and punctuality Top
14.1. Timeliness
Timeliness The construction costs index for residential buildings is published approximately 10 days after the end of the reference month.
Timetable of data collection The prices are measured monthly. The questionnaires are sent to the units on the 12th of each month, and returned to Statistics Norway 10 days later.
14.2. Punctuality

No time lag between the actual delivery of the data and the target date.


15. Coherence and comparability Top
15.1. Comparability - geographical

The index is published at national level only.
15.2. Comparability - over time

The index goes back to 1978.
15.3. Coherence - cross domain
Dissemination of information that support statistical cross-checks and provide assurance of reasonableness None
Confrontation with other data sets None.
15.4. Coherence - internal

Some data are collected from the Consumer Price Index, Wage Statistics, Cost Index for Road Goods Transport and NTNU's Cost Index for Machinery.


16. Cost and Burden Top

An outlet uses an average of 17.5 minutes every month to fill out the questionnaires, which means that the sample of outlets use a total of 1 050 hours or 131 days of work each year.


17. Data revision Top
17.1. Data revision - policy

We produce no prelimenary data.
17.2. Data revision - practice
Provision of information about revision and advance notice of major changes in methodology Revisions are announced simultaneously with the release of the indices.


18. Statistical processing Top
18.1. Source data
Type of source The material costs are collected by a statistical survey. Other sources are Statistics Norway's quarterly wage statistics adjusted for the social security charges, and further machinery costs indices calculated by NTNU and transport costs indices compiled by Statistics Norway.
Frame on which the source is based Central Register of Establishments and Enterprises.
Sample or census A sample of 420 suppliers of the construction activity (mainly wholesale companies) provide about 3 450 price observations every month.
Criteria for stratification Stratification by activity, turnover, geography and judicious selections.
Threshold values and percentages Not available.
Frequency of updating the sample Every second year.
18.2. Frequency of data collection
Periodicity of data collection Monthly.
18.3. Data collection
Questionnaires used in the survey A single standardied electronically questionnaires are used to collect material costs.
Planned changes in national questionnaires None
Data collection media Electronically
Planned changes in data collection methodology None.
18.4. Data validation

The prices are put through tests, which identify observations with large price changes from the previous month. Prices are also checked when sorted by item and when items are aggregated into groups. Sub-indices and item-indices are checked against time-series that are published earlier and comparisons with other statistics.
18.5. Data compilation
Estimates for non-response Not relevant.
Estimates for grossing-up to population levels No grossing-up is done.
Type of index The indices are calculated according to a Laspeyres formula within a fixed base.
Method of weighting and chaining The weights are based on calculations and accounting data from 7 apartment building projects and 4 detached house projects using projects which in size and standard were close to the average from Statistics Norway's surveys of detached houses and multi-dwelling units completed in 1997 and 1998. The weight basis was prepared in accordance with the Norwegian Standard for specification of costs in building projects and adopted in January 2000.

The overall building cost index for houses comprises the two indices for detached houses and apartment buildings. The weights used are square metres of useful floor space for dwellings under construction multiplied by the average price (in Kroner) per square metre.
Planned changes in production methods None.
18.6. Adjustment
WDA, SA and other calculations No seasonal adjustments are made.


19. Comment Top

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Related metadata Top


Annexes Top