Leeds City Council states the crossing route in its own words: "You will need to arrange your own New Roads and Street Works Act (NRSWA) accredited contractor to provide a quote for the construction costs and carry out the works at your own expense", and that contractor "will need to apply for a Section 171 licence to gain permission to excavate on the public highway". An inspector visits first, and the council adds that "if all requirements are met, you will receive a commencement letter giving permission to proceed with construction".
The council publishes its own front garden design guidance, which states that "planning permission is required for traditional paving of an area bigger than 5 square metres that does not provide for the water to run to a permeable area like a lawn or border", and names permeable block paving "shaped with corner notches to aid water runoff" and "porous poured surfaces (asphalt, resin-bound gravel)" among the options.
On heritage the council states that "there are 80 Conservation Areas in the Leeds district" and that 55 of them have appraisals and management plans. It also states that where the crossing will be accessed from an A, B or C classified road, or passes over non-highway land, approval from planning services is needed.
Behind the council guidance sits the national rule on the Planning Portal. Front garden paving on an eligible house with the relevant permitted development rights may use permeable surfacing or drain 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 Section 171 licence and the proposed work before confirming whether permission is needed.