Adding EV charging to a single-family home is simple. Adding it to an apartment or multi-tenant building is a different problem: many drivers share one electrical supply and one parking area, billing has to be split fairly, and the garage is often underground with no signal. This guide covers what property managers, asset managers, and building owners need to get right — the four challenges that decide whether a building’s charging works quietly for a decade or becomes a standing complaint.
It’s also no longer a question you can park indefinitely. Charging overnight at home is typically the cheapest and most convenient way to run an EV — and for residents of multi-tenant buildings, “home” means the shared garage. Buildings that can’t answer the charging question start losing exactly the tenants who ask it.
Who this is for
- Asset managers rolling charging across a residential or mixed-use portfolio. The priority is a repeatable standard with per-site economics that hold up — not a bespoke engineering project for every building.
- Property managers adding it to individual buildings on behalf of owners. The priority is fair cost allocation with zero added operational workload: no meter-reading rounds, no invoicing spreadsheets, no becoming first-line charging support.
- Building owners who want charging as a tenant amenity that raises the building’s attractiveness — without becoming a charging operator themselves.
The common thread: you’re providing charging to many drivers on shared infrastructure — not installing one box for one car. That changes every decision that follows: hardware, billing, power, and who runs the system day to day. (Homeowners’ associations face the same four challenges, with an extra layer of governance on top.)
Challenge 1: the garage has no signal
Most apartment parking is underground, where reinforced concrete blocks cellular reception and the building’s WiFi was never planned to reach. Conventional connected chargers need a network at every bay, so deployments end up paying for data cabling, repeaters, or a dedicated garage WiFi network — at larger sites commonly €500–€2,000 per parking space of infrastructure before the chargers themselves — and the whole garage still depends on that one link staying up.
An offline-first approach removes the dependency instead of paying to work around it: drivers authorise directly at the charger via Bluetooth, chargers coordinate power among themselves over a local wireless mesh, and session data syncs to the cloud in the background whenever a connection is available. Charging and billing keep working with zero signal in the garage. See EV charging without internet for how the architecture works, and the dedicated underground parking use case.
Challenge 2: billing each tenant fairly
If the building pays one electricity bill, you need to attribute energy to the right driver — accurately enough that nobody argues. Buildings typically end up with one of three models:
| Billing model | How it works | Where it breaks |
|---|---|---|
| Flat monthly fee | Every participant pays the same amount | Light users subsidise heavy users; disputes are built in |
| Submeter per bay | Each charger is wired to the tenant’s own meter | Costly electrical work per bay; awkward for shared spots and tenant changes |
| Per-kWh platform billing | Each session is metered per user; software issues the invoices | Needs calibration-compliant metering and a billing backend |
Beyond a handful of chargers, per-kWh platform billing is the only model that stays fair and scales. That means per-user, calibration-compliant metering — in Germany, Eichrecht-conform — so each tenant is billed for exactly what they used, and the building isn’t subsidising anyone. Automated monthly billing removes the spreadsheet work from the property manager. The software layer that does this — access control, metering, invoicing — is a charge point management system (CPMS); for apartment garages, choose one that still captures billable records when the garage has no connection. HeyCharge’s SecureCharge platform stores session records on the charger and syncs them for invoicing later.
Challenge 3: sharing limited power
A building’s supply usually can’t deliver full power to every charger at once: twenty 11 kW chargers add up to 220 kW of nominal demand, typically far beyond a residential building’s spare capacity. The two naive answers are both bad — permanently throttling every charger to a trickle, or paying for a grid-connection upgrade that’s often the single most expensive item in the whole project.
Dynamic load management is the third way: chargers share whatever capacity is actually free from moment to moment, so every vehicle is served overnight and the main fuse never trips. Two things to check when comparing systems: the management must be dynamic (static per-charger allocations waste most of the capacity most of the time), and it shouldn’t depend on cloud connectivity or per-bay network cabling to function. On HeyCharge’s SecureCharge platform, chargers coordinate over a local Zigbee mesh — buildings with 50+ chargers run on a single grid connection this way — and grid-operator demand-response signals (§14a EnWG in Germany) are handled as well. More on static vs. dynamic balancing, and what a grid upgrade actually costs, in how to cut EV charging infrastructure costs.
Challenge 4: cost and existing hardware
Cabling, grid work, and downtime — not the chargers — drive most of the budget at multi-bay sites; see how to cut EV charging infrastructure costs for the line-by-line breakdown. An offline-first architecture attacks the biggest lines directly — no network cabling per bay, no SIM contracts or connectivity fees, load management instead of a grid upgrade — which is where the 40–70% total-cost advantage over conventional connected systems comes from.
Two decisions worth making early:
- Pre-wire now, add chargers later. Laying the electrical backbone for the whole garage once, while the crew is on site, is typically far cheaper than returning bay by bay as residents buy EVs. Chargers then snap onto pre-wired bays with minimal effort.
- Retrofit instead of replacing. If some chargers are already installed and speak OCPP, an OCPP retrofit brings them onto one platform — one app, one billing flow — instead of writing off working hardware.
Rolling it out
- Survey the building: parking layout, available supply capacity, cable routes from the electrical room, and how many residents want charging now versus in two years. This determines phasing and how much load-management headroom you need.
- Choose an operating model — full-service (the operator handles power, billing, support) or self-managed. This is the decision that most shapes the property manager’s daily life; see the comparison below.
- Install with load management designed in from the start — and pre-wire spare bays while the electricians are on site — so the site scales as more residents go electric instead of hitting a wall at charger number six.
- Onboard residents with an app and per-user billing. On a platform that authorises locally over Bluetooth, onboarding works the same in a basement with zero bars as it does anywhere else.
The operating-model choice in detail:
| Full-service operator | Self-managed | |
|---|---|---|
| Upfront investment | Typically carried by the operator | Owner / building |
| Billing, support, operations | The operator’s job | The property manager’s job |
| Control over pricing & terms | Set by contract | Stays with the owner |
| Effort for the building | Near zero | Ongoing |
The honest deciding question: does anyone on site actually want to run a small charging business? If not, full-service wins.
HeyCharge delivers this end-to-end for residential portfolios — 700+ chargers across 130+ sites, with 2,000+ parking spaces pre-wired for the residents who go electric next — see solutions for building owners.
FAQ
Who pays for chargers in an apartment building? It varies: the owner, the operator, or the residents who use them. A full-service operator model can remove the upfront investment for the building.
Can tenants be billed individually? Yes — with per-user, calibration-compliant metering, each driver is billed for their own energy automatically.
Do I need internet in the garage? No. Offline-first charging authorises locally and syncs in the background, so it works in underground garages with no signal.
Do all residents have to participate? No. Most sites start with the residents who drive EVs today and pre-wire for the rest. With per-user billing, non-participants pay nothing.
How many chargers can one building support? Usually far more than the raw supply figure suggests. With dynamic load management, chargers share the available capacity in real time — buildings with 50+ chargers can run on a single ordinary grid connection.
What about wallboxes some tenants already installed privately? If they’re OCPP-capable, they can usually be brought onto the shared platform with a retrofit gateway, so the building ends up with one system and one billing flow instead of a patchwork.
Related guides
- EV charging without internet: a complete guide — offline-first architecture, and retrofitting chargers you already own
- How to cut EV charging infrastructure costs — where the budget goes, and the load management that avoids a grid upgrade
Planning a building or portfolio? Talk to our team or see solutions for building owners.