Background Notes and Methodology

Scope and Background

The New Dwelling Completions series is produced by the CSO on a quarterly basis. A Housing Analytics Group (HAG) was established in 2017 by the Department of Housing, Planning and Local Government (DHPLG). This group, which met for the first time in May 2017, consists of representatives of bodies with a significant interest and role in housing, housing policy and related policy areas. 

The HAG focused on a review of housing related data published nationally and in particular on the number of dwellings built every year. Arising from the work of this group and other direct discussions between the CSO and DHPLG, a significant outcome was to assess the suitability of current housing indicators for estimating the number of new dwelling completions in Ireland.

Historically, the number of new dwellings built in Ireland, as published by the DHPLG, was based on the number of connections to the ESB Network. However, in recent years it became apparent that this series was overestimating the levels of new dwelling construction in Ireland. The New Dwelling Completions series will look to replace this and other available indicators of housing activity in Ireland. This series will include information on dwelling type, urban/rural location, activity by Local Authority and by Eircode Routing Key. It will continue to be based on domestic ESB connections but will correct for over-coverage by using additional information from ESB Networks and incorporating data from other sources. It also includes data on the number of reconnections and on houses from unfinished housing developments that are coming back into use. This will provide policy-makers with a valuable insight into the number of new dwellings available for occupation in the quarterly period concerned and also show data on the numbers of dwellings being constructed.

Geographic Split

The New Dwelling Completions data series is based on the number of new dwellings connected by the ESB Network to the electricity supply and may not accord precisely with Local Authority or Eircode Routing Key boundaries. The NDC series is split into counties and Eircode Routing Keys based on the information of the substation rather than the exact location of the dwelling. As Eircode becomes available as the unique identifier, it will replace the source of identifying the location of a new dwelling. 

The breakdown of ESB connections by type of connection and dwelling is based on NUTS3 regions as described below:

• Border: Cavan, Donegal, Leitrim, Monaghan, Sligo
• Dublin: all four local authorities within Dublin
• Mid-East: Kildare, Louth, Meath, Wicklow
• Midlands: Laois, Longford, Offaly, Westmeath
• Mid-West: Clare, Limerick, Tipperary
• South-East: Kilkenny, Waterford, Wexford
• South-West: Cork City and County, Kerry
• West: Galway City and County, Mayo, Roscommon

Classification

ESB connections are classified into four categories:

• New dwelling completion: Recently constructed dwelling, where a dwelling is a self-contained unit of living accommodation.
• Reconnection: A dwelling that has been reconnected to the ESB Network after a period of two years of disconnection.
• UFHD: Connection to the ESB Network of previously completed dwellings in Unfinished/Ghost estates. A methodology was developed to identify houses which were complete in 2011 and were subsequently connected to the ESB Network. Although these dwellings may have required finishing to become available for use they are not new dwelling completions for the purposes of this publication. However, dwellings in Unfinished/Ghost estates which were not in a complete state in 2011 are included as new dwelling completions on connection to the ESB Network.
• Non-dwelling: A building connected to the ESB Network through a domestic connection that is not constructed for residential use. 

The dwelling type is defined by the ESB Network and classified into three categories:

• Single: If a single domestic dwelling or farm premises is to be connected to the ESB Network, Form NC2¹ must completed and the dwelling is defined as 'single'.
• Scheme: If a new multi-unit development with two or more houses is to be connected to the ESB Network, Form NC1² must be completed and each dwelling is defined as 'scheme'. 
• Apartment: If a new multi-unit development with two or more apartments is to be connected to the ESB Network, Form NC1² must be completed and each dwelling is defined as 'apartment'.

The classification of urban and rural dwellings is also defined by the ESB Network and based on the Distribution Use of System (DUoS) tariff, which is a fee that ESB Networks charge Electricity Suppliers for use of the Electricity Distribution System³. 

• Urban: DUoS Group = DG1, urban domestic.
• Rural: DUoS Group = DG2, rural domestic.

Coverage

Only domestic connections where a dwelling is a self-contained unit of living accommodation is included in the New Dwelling Completions series. Commercial properties, shared and communal living arrangements are excluded.

Data sources

The primary data source used for the New Dwellings Completions series is the ESB domestic connections dataset where the date that the connection is energised determines the date of completion. It is accepted that the ESB domestic connections dataset overestimates new dwellings and the CSO has adjusted for this overcount by using additional information from the ESB and other data sources. The ESB domestic connections dataset is matched by the CSO to Building Energy Rating (BER) data, compiled by the Sustainable Energy Authority Ireland (SEAI). Under Statutory Instrument (S.I.) No. 243 of 2012, all residential property for sale must disclose their BER assessment (with some very minor exceptions). The BER includes detailed information on the type of dwelling, the type of certificate (Provisional, Final, Existing) as well as the date of assessment and construction. As the collection, storage and maintenance of Eircode improves, other data sources can be further consulted to improve on the accuracy of the series.

Revisions

The New Dwelling Completions series is a new statistical product compiled from third party data sources. The series will be revised on an ongoing basis as more timely and accurate data sources become available and these data sources can be matched to the ESB new connections data set.

¹ Form NC2: https://www.esbnetworks.ie/docs/default-source/publications/connection-to-a-single-domestic-dwelling-or-farm-premises-application-(nc2)-05-06-18.pdf?sfvrsn=a75c33f0_16

² Form NC1: https://www.esbnetworks.ie/docs/default-source/publications/multi-unit-development-application-(nc1)-05-06-18.pdf?sfvrsn=7e4433f0_14

³ Rules for Application of DUoS Tariff Group: https://www.esbnetworks.ie/docs/default-source/publications/rules-for-application-of-duos-tariff-group.pdf?sfvrsn=a44b33f0_4

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