42 - CIVIL ENGINEERING Companies in Ireland
Approximately 1,683 real businesses classified under 42 - Civil engineering in Ireland, with officer, shareholder and beneficial ownership records sourced directly from official government registries.
Approximately 1,683 real businesses classified under 42 - Civil engineering operate in Ireland. Covers companies officially classified under SIC 2007 code 42 (Civil engineering), part of Ireland's SIC 2007 classification of economic activities. This division is one of the sub-sectors making up the broader Construction sector. Ownership, beneficial-ownership disclosure and company-registration rules for businesses under this specific activity code follow the same general framework that applies across Construction in Ireland.
Beneficial-ownership and registration rules for Construction companies in Ireland follow the same national framework as every other sector there.
Full Ireland beneficial ownership overviewTop 42 - Civil engineering Companies in Ireland
Live from the register. Every row opens the full record — officers, shareholders and resolved group structure.
Data Coverage
Record counts for SIC Code F in Ireland, as of the last reconciliation.
Section F is 13% of the Ireland register by entity count and its 3rd largest sector — see all sectors.
Analysis
What this data actually tells you
Construction in Ireland runs on a withholding-tax system, Relevant Contracts Tax (RCT), that acts as a live, ongoing compliance signal rather than a one-time registration check. Principal contractors must deduct RCT from payments to subcontractors in construction, forestry and meat-processing at one of three rates — 0%, 20% or 35% — with the applicable rate reflecting the subcontractor’s own tax-compliance standing with Revenue. Subcontractors must supply their name as registered with Revenue and their Tax Reference Number before a contract can be properly registered.
RCT compliance, filing and payment now runs entirely through Revenue Online Service (ROS), with Revenue applying increased scrutiny through 2025-2026. The obligation extends to non-resident subcontractors doing work in Ireland, with the principal contractor still required to withhold RCT from the gross payment regardless of the subcontractor’s home jurisdiction. For verification, a subcontractor’s current RCT rate is a real, checkable, and dynamic signal of its Revenue standing — not something a company filing shows on its own.
Ireland Construction, by the register
Charts render from live counts. Modules are suppressed where coverage is too thin to be meaningful.
Active vs. inactive
Section F entities currently on the register as active, vs. struck off or dormant.
Company size, by disclosed headcount
By number of employees on file, Section F, Ireland. 27 entities with no disclosed headcount are not counted in any band.
Who uses Ireland construction ownership data
The three checks this sector's data is most often run for.
RCT (Relevant Contracts Tax) registration check
Principal contractors must deduct Relevant Contracts Tax from payments to subcontractors in construction, forestry and meat-processing at rates of 0%, 20% or 35% — the rate applied depends on the subcontractor’s own Revenue compliance record, making it a real, checkable signal of a subcontractor’s tax standing.
Fully digital RCT compliance tracking
All RCT compliance, filing and payments run online through Revenue Online Service (ROS), with increased Revenue scrutiny in 2025-2026 — a subcontractor’s RCT rate (0/20/35%) is a live, checkable Revenue record, not a static classification.
Non-resident subcontractor exposure
RCT applies even to non-resident subcontractors carrying out work in Ireland, with the principal contractor required to deduct it from the gross payment — a real, checkable withholding obligation that follows the work location, not the subcontractor’s home jurisdiction.
Get complete shareholder and officer records, ultimate beneficial owner resolution, and ongoing ownership monitoring for Ireland companies — via API or a bulk data feed.
Frequently Asked Questions
How many companies are classified under 42 - Civil engineering in Ireland?
Approximately 1,683 businesses are classified under 42 - Civil engineering in Ireland.
What does SIC 2007 code 42 cover?
42 - Civil engineering is the official name for this activity under Ireland's SIC 2007 classification of economic activities. It is a sub-category within the broader Construction sector.
How is this different from the broader Construction category?
Construction is the top-level sector; SIC 2007 code 42 identifies one specific activity within it, letting you narrow a search to exactly this business type rather than the whole sector.
What ownership information is available for these companies?
The same beneficial-ownership, shareholder and officer disclosure framework applies as for any other company in Ireland, regardless of its specific activity classification. See the individual company profile for the full ownership picture, or the Construction sector overview for the general national framework.
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