Ipswich Borough Council names 15 conservation areas and six Article 4 directions, and two of those directions reach the paving. At The Walk and Thoroughfare the direction removes permitted development for "proposals to alter the colour of the timber shopfronts and to change the current yorkstone paving", and at The Walk (Courtyard) for "alterations to the Yorkstone paving".
The council's Article 4 guidance states that "proposals for vehicle hard standings should be refused unless they could be located or screened to minimise the impact on the surrounding area", and that permission to erect a fence, wall or railing on the front curtilage boundary "would normally be approved if it was of a type which prevailed in the area". It sets the scope plainly: "In all cases apart from alterations to chimney stacks, permission would be required where the proposed development fronts onto a relevant location", a relevant location being "a highway (including footpaths), or open space".
Highways is Suffolk County Council, not the borough. Its dropped kerb criteria require the work to be "undertaken by a contractor accredited in accordance with the requirements of the New Roads and Street Works Act 1991" holding "at least 5 million pounds public liability insurance", state that "a sustainable drainage system must be used to prevent water from spilling onto the highway" and that "surface water run-off from the property on to the highway will not be permitted", and set a standard parking space of 2.5 metres wide by 5 metres deep, rising to 3 metres wide between solid boundaries and 6.2 metres deep in front of a forward projecting garage door. The criteria also note that an impermeable drive or hardstanding over five square metres in a front garden needs planning consent.
The Planning Portal states the national rule behind that note. An eligible house with the relevant permitted development rights may be paved with permeable surfacing or drained to a lawn or border without an application, and impermeable paving over five square metres needs permission where it does not drain to a permeable area.
We would explain how you check the conservation boundary, any Article 4 direction, the county's crossing criteria and the proposed work before confirming whether permission is needed.