A hundred-bay residential car park will not need a hundred charge points for years, and it will need them eventually. Designing for either extreme produces the two common failures: infrastructure that must be redone, or capital sitting idle.
The workable middle is infrastructure sized for the end state with charge points populated as residents ask.
Size the infrastructure once
Containment, cable capacity and distribution should be installed for a plausible full-build position. That work is disruptive and expensive to repeat, and it is the part that benefits most from being done once.
Charge points themselves are comparatively cheap and quick to add. Populating them incrementally is the right way to phase the spend.
The supply will bind before the parking does
Residential buildings rarely have spare capacity sized for vehicle charging. Managed charging is therefore not an optimisation in this setting; it is what makes any meaningful number of points possible without a supply upgrade the building would have to fund.
With long overnight dwell, a shared allowance delivers a full charge to nearly everyone regardless of how it was divided during the night.
Assigned or unassigned bays changes everything
Where bays belong to apartments, points can be private, billed to that resident, and the fairness conversation is about who funds shared infrastructure.
Where parking is unassigned, points are shared resources needing authorisation and per-session billing, and the conversation becomes about access rules and occupancy after charging completes. Establish which applies before designing anything.
Cost allocation decides approval
Energy attribution is where these schemes fail politically rather than technically. Residents who suspect they are subsidising a neighbour's driving withdraw support regardless of how good the engineering is.
- Shared infrastructure, usually funded collectively as a building asset.
- Individual charge points, usually funded by the resident requesting one.
- Energy consumed, which must be attributed accurately per point.
- Ongoing maintenance, which needs a named owner before installation.
Phasing the rollout
Install containment and distribution for the full build, populate the first tranche of points, and define the process by which a resident requests and funds an additional one.
That process matters as much as the electrical design. A scheme where adding a point requires a committee decision each time will stall, and residents will install unofficial arrangements instead, which is the outcome the scheme existed to prevent.
The maintenance question
A charge point with no maintenance owner becomes a disused charge point after its first fault. Whether that is the building, a contractor or the resident should be settled and written down before installation.
At a hundred bays this becomes an estate rather than an amenity, and it needs the corresponding operational thought.