Hi,
The NICEIC has two Rolls, the Approved Contractor (AC) and the Domestic Installer (DIS). The AC Roll is for anyone carrying out any type of electrical work, the DIS Roll is for domestic work only.
For the AC Roll you require five jobs.
The DIS Roll you require two jobs. For this Roll the very minimum required for one of them is a new circuit, however it cannot be just 1M long as they cannot get an assessment of your capabilities, it must be run across the dwelling and comply with all the latest regulations, for this you will need an Electrical Installation Certificate, the second can be an addition or alteration to an existing circuit and a Minor Works Certificate should have been issued.