Microsoft says it operates a data centre at Grange Castle in Dublin and is planning another in County Kildare. Separately, a planning-register entry records an extension of permission for two proposed Grange Castle facilities, DUB14 and DUB15, granted on 21 July 2026. The available records do not establish that the Kildare plan and the DUB14/DUB15 proposal are the same project.
What Microsoft has confirmed about Ireland
Microsoft’s Ireland community page identifies Grange Castle, Dublin, as a location where the company operates a datacentre and says: “We are planning a datacentre in County Kildare.” The page does not provide application details or a project schedule for the Kildare plan.
That statement is distinct from the Grange Castle proposal recorded in a planning-register summary. Without a link between the records, it would be inaccurate to describe DUB14 and DUB15 as the Kildare project, or to apply the planning-register status to the Kildare plan.
What the Grange Castle planning record says
The planning-register entry describes two proposed two-storey data centres with mezzanines, DUB14 and DUB15, alongside a central administration building of one to four storeys. It locates the proposal at Grange Castle Business Park, Nangor Road, Clondalkin, Dublin 22. The summary reports that an extension of permission was granted on 21 July 2026. This is a register summary; the full council application file is needed for the underlying application documents and conditions. Planning-register entry
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The register also records a separate application for 13 temporary replacement generators for DUB15, refused on 26 November 2024. Its summary says the generators were proposed to operate the data hall until a permitted Gas Networks Ireland skid was constructed and operational. That refusal alone does not establish the site’s current power arrangements or what infrastructure was ultimately built. Planning-register entry
What is known about jobs and construction
Microsoft’s October 2025 Ireland fact sheet says its Grange Castle facilities employed approximately 400 people as of 2025. The same fact sheet estimates that a typical new datacentre build would require 350 construction roles and approximately 2.2 million work hours. Those are company-wide typical-build estimates, not confirmed staffing or work-hour forecasts for the Kildare plan or DUB14/DUB15. Microsoft Ireland fact sheet, October 2025
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- Keep critical network equipment secure: glass door and side panels are lockable to prevent unauthorized access; Front door can be installed on either side of the front of the cabinet to satisfy your door swing orientation preference
- Easy equipment configuration: Fully adjustable mounting rails and numbered U positions, with square holes for easy equipment mounting with top and bottom punchout panels for easy cable access
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- PCI & HIPPA and EIA/ECA-310-E compliant
How to read the two project references
| Reference | Location | What the source establishes |
|---|---|---|
| Microsoft’s Ireland community page | County Kildare | Microsoft says it is planning a datacentre; application particulars and schedule are not stated on the page. |
| Planning-register summary | Grange Castle Business Park, Dublin 22 | Describes DUB14 and DUB15 with an administration building; reports an extension of permission granted on 21 July 2026. |
The distinction matters for anyone tracking the project’s local effects, construction timing, or approvals: the records establish different locations and different levels of project detail. Neither source, as cited here, connects the two references.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What remains unclear
The exact project meant by the broad phrase “Microsoft Dublin data center plans” cannot be identified from these records alone. Microsoft’s page confirms a Kildare plan but gives no application particulars; the planning summary provides a dated permission-extension status for the Grange Castle proposal. A definitive connection or current project-specific status would require the relevant announcement or full council file.
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