Similar issues will crop up for equipment hire, e.g. cranes for lifting windows or large wall sections depending on your building method. Skip hire could be an issue as well, as it is preferable not to leave them on the side of the road.
Cement mixers will also need access and if not, will park at the roadside (providing there is room and they are allowed to do so; this can require a permit from the local authority in some instances) and you will need to organise a pump to get the material to site.
If your site requires piled foundations, the piling rig will need sufficient hard-standing to operate safely.
Rules for access and parking requirements are controlled by the respective roads authorities in NI and ROI and additionally, the building regulations in both areas stipulate minimum widths of access and turning circles for fire brigade vehicles, etc.
It may therefore be more cost effective to get the as-approved access construction carried out first and it will provide sufficient access and a safe base for construction plant and equipment, with the added benefit of becoming well compacted during building works.