Yes, ICF is used for houses in Ireland, and systems with appropriate certification can be designed to comply with the building regulations. As with any system-built method, suitability depends on using a certified system, a competent installer and correct detailing, and on the assigned certifier being satisfied with the evidence of compliance.
The building regulations are performance-based, so they do not prescribe a construction method. What matters is that the chosen system can be shown to meet the requirements for structure, fire, moisture, energy and ventilation. Certification such as an NSAI Agrément certificate, or an equivalent European technical assessment, provides that evidence and sets out the conditions of use.
Practical considerations include the availability of experienced installers locally, the need for accurate setting out and bracing during the pour, planning services routes in advance, and confirming that your lender, insurer and warranty provider accept the system.