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Energy · Co. Dublin

Grange Castle Business Park, Nangor Road, Clondalkin, Dublin 22

Granted 21 Jul 2026

Archived record

This application has left our current planning lists, so this page is no longer updated. We last saw it in the council's register on 19 Aug 2026. The details below are as they were then. The council's register has the current status.

What and where

Demolition of existing single storey vacant house

Demolition of existing single storey vacant house, garage and outhouse (total gross floor area (GFA) c.291.2sq.m) and removal of existing temporary construction car park; Construction of a single 1-4 storey Central Administration Building and 2 2-storey (with mezzanine) data centres (DUB14 & DUB15) all to be located west of data centres DUB9, DUB10, DUB12 & DUB13 within the MS campus; The Central Administration Building (c.6.03m to c.19.85m high) will comprise central office administration, with staff cafeteria, staff gym and reception (GFA c.3,520sq.m), with provision of PV panels on the roof; each data centre (c.15.6m high to parapet height and c.18.65m to top of roof plant) will include data halls, admin blocks (comprising offices, canteen, loading dock, storage and ancillary areas) and a variety of mechanical and electrical plant areas/structures including Modular Electrical Rooms (MERs), battery rooms and transformer areas. GFA of DUB14 is c.28,072sq.m and GFA of DUB15 is c.28,173sq.m (c.56,246sq.m in total); DUB14 will also include 21 diesel generators and associated sub-stations (E-houses) and 11 mechanical flues (each c.30.75m high); Provision of a gas generator compound (to serve DUB15) containing 20 generators, 5 E-houses and 5 flues (c.25m max height); Provision of a Gas Networks Ireland gas skid including 3 kiosk buildings; Expansion of existing electrical sub-station compound (originally granted under SD07A/0632) to provide 3 additional transformer bays. 3 E-houses and 1 control room, 2 auxiliary transformers; 2 sprinkler tank and pump house areas, 1 additional rainwater harvesting plant; Provision of 168 permanent car parking spaces and 40 cycle parking spaces; Provision of additional western access to the MS campus (to serves the Central Administration Building) from the Business Park estate road (including bridge over the Griffeen River) with existing temporary access to be extinguished; Physical integration with the remainder of the existing MS campus (including internal access roads and landscaping) with associated modifications to the western boundary of the DUB09/DUB10/DUB12/DUB13 data centre development as permitted under SD16A/0088; Provision of a new temporary construction car park (with 802 car spaces, shuttle bus stop and shelter) on site north of the main entrance to the business park; Total gross floor area of the development will be c.59,766sq.m; All associated site development works, drainage and services provision, landscaping, boundary treatments (including security fencing) and associated works; An Environmental Impact Assessment Report (EIAR) has been submitted with this application; The application relates to a development which comprises an activity requiring an integrated pollution prevention and control (IE) licence.

Location
Dublin 22, Co. Dublin Map
Planning reference
SD20A/0283/EP

Key facts

Floor area
766 m²
Indicative value
€500k–1mPlanningBrief estimate
Project type
Energy
Received
27 May 2026
Granted
21 Jul 2026

Timeline

  1. Application received
  2. Granted

Outlook

What happens next

Permission was granted on 21 Jul 2026 and no site start has been filed yet. The next step is a commencement notice, filed before building work begins; the start date and who will build it are not known yet.

Work packages named so far

  • Roads and site development worksNamed in the application description
  • Services and drainageNamed in the application description

An outlook from the planning record, not a tender or a confirmed start date.

Documents and evidence

Check the record

  • Council planning fileThe application file SD20A/0283/EP on planning.agileapplications.ie: drawings, reports and the decision.Open the council's file

Reviewed build intelligence

What the documents establish

Government document review

One-year extension granted by order dated 21 July 2026, expiring 23 June 2027. The May applicant report describes most of the parent permission as substantially complete; current site progress is not independently verified.

2 official documents inspected · Checked 2026-09-06 · Official file index

The permission now expires on 23 June 2027

Extension and source-reported progress; completion not independently verified · South Dublin SD20A/0283/EP; extension of the earlier SD20A/0283 permission

What the evidence says
The council decision dated 21 July 2026 grants a one-year extension of the existing permission, with an expiry of 23 June 2027. The notification was signed on 22 July. Its long development description repeats the older campus permission; this extension is not treated as approval for another pair of data-centre buildings or another equipment order.

Why it may matter — interpretation
Interpretation: distinguishes a consent-duration change from additional development scope.

What is not established
Subsequent amendments, completed remaining work and a completion certificate have not been verified.

Inspect the evidence

Microsoft campus: decision granting extension of duration · p.2
shall expire on 23rd June 2027 · Issued 2026-07-21 · Order 0818; notification signed 22 July; one-year extension to 23 June 2027 · Checked 2026-09-06

shall expire on 23rd June 2027

The application says the gas skid is the only remaining work

Extension and source-reported progress; completion not independently verified · Applicant-reported completion boundary for the existing campus permission

What the evidence says
The May extension submission reports the central administration building and DUB14/DUB15 data centres as substantially complete. It identifies the GNI gas skid as the only remaining work and shows that small area separately from the constructed development. This is the applicant’s reported progress at that date, not an independent inspection or evidence that all old generator and transformer quantities are new opportunities now.

Why it may matter — interpretation
Interpretation: prevents the repeated historic building and equipment description from being counted as an entirely new construction package.

What is not established
Current as-built progress, the detailed remaining skid specification and installed equipment are unverified.

Inspect the evidence

Microsoft campus: extension-of-duration application · p.11
The only remaining works are the GNI skid · Issued 2026-05-27 · Reported completion boundary and programme; existing permission and subsequent amendments remain distinct · Checked 2026-09-06

The only remaining works are the GNI skid

The stated 2026 target is separate from the extended expiry

Extension and source-reported progress; completion not independently verified · May reported programme for the remaining skid; later permission expiry is a separate milestone

What the evidence says
The May submission says skid construction had commenced and was due to finish during 2026. It seeks the additional year to allow for delays and anticipates completion by 2027 at the latest. These are source-reported programme expectations. The later council expiry of 23 June 2027 is a permission date, not evidence that commissioning is finished.

Why it may matter — interpretation
Interpretation: keeps planned completion, legal duration and actual completion distinct.

What is not established
A current construction programme, commissioned connection and verified completion date are not established.

Inspect the evidence

Microsoft campus: extension-of-duration application · p.13
construction of the GNI skid has commenced · Issued 2026-05-27 · Reported completion boundary and programme; existing permission and subsequent amendments remain distinct · Checked 2026-09-06

construction of the GNI skid has commenced
Remaining document questions
  • Which later official decision, approved detail or revision changes these source-specific findings?
  • Has a phase-specific official record established the selected equipment or installed specification?

Selected pages of 2 government-published PDFs were visually inspected. Nine literal public council document links were retained. Selected pages of two supporting PDFs were visually inspected. A third assessment PDF was text-screened only; this is not a comprehensive review of the older parent permission. Proposals do not establish procurement or installed work.

How we know this

From the South Dublin County Council planning register, as last seen on 19 Aug 2026. The council's own file is the official record. Facts from the planning documents were read from the documents in that file.

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