A pre-wiring contract between a builder and an EV installer splits one job at the wall: the builder’s side provides the route, the circuit provision and the panel space during construction, and the installer’s side mounts, connects and commissions the charger after the finishes. The contract’s real work is fixing in writing who supplies the charger, who checks the hidden work before it is covered, and how changes are priced. Without that split on paper, every gap lands on whichever firm is on site last.
Key Takeaways
- A pre-wiring contract splits the job at the wall: builder’s provision during construction, installer’s fit-off after finishes.
- Name one charger buyer, one rough-in checker and one inspection booker — in writing.
- Variations are agreed and priced before the work, because the sized circuit caps every later change.
- The contract records the provision; codes and inspections check it.
What the Pre-Wire Has to Provide
Pre-wiring is a scope, not a charger. On the electrical plan it appears as a conduit or cable route from the panel to the parking position, a circuit provision sized for the planned charger class, and space reserved in the panel. EV charging is a continuous load under the U.S. National Electrical Code, so the circuit is sized at 125% of the charger’s draw — 48 A means a 60 A breaker. Which readiness tier a site must meet is a code question, covered in our guide to EV-ready new construction and building codes; what a finished job looks like is set out in what a standard installation includes. Local codes and the builder’s licensed electrician decide what applies; the contract records the agreed provision.
The Scope Split, Stage by Stage
| Stage | Builder’s side | Installer’s side | Pin down in the contract |
|---|---|---|---|
| Specification | House plans, panel schedule, parking layout | The charger class the pre-wire must serve | The agreed circuit size and charger class, named on the plan |
| Rough-in | Route and circuit provision by the builder’s electrician | A position check before anything is covered | Who verifies the rough-in, and when |
| Fit-off | Access and finished surfaces ready | Mounting, connection and commissioning | Programme dates, and who books the final inspection |
| Supply | Buys the charger, if the house sale includes it | Buys the charger, if priced into the install | One named buyer, the warranty paperwork route, the substitution rule |
| Handover | The buyer’s document pack | Commissioning record and settings as left | The document list each side hands over |
Read the table as a checklist, not as standard terms: there is no standard version of this contract.
Variations Are Where the Contract Earns Its Keep
Buyers change their minds after rough-in: a larger charger, a second bay, a moved position. Every change meets the sized provision first — a circuit roughed in for one charger class caps what a later unit can draw, which is why the variation clause matters most. The contract should require variations agreed in writing before the work, with price and programme effect settled at the same time. The cost drivers a variation disturbs are those in what affects installation cost.
Two cautions belong in every version. This is not legal advice: on a multi-home development, the sums justify counsel reviewing your template once, before the first plot is sold. And the electrical work stays with licensed electricians — an installer’s own licence position should be confirmed under local rules before contracting, as what qualifications installers need sets out.
Supplying the Charger Side
The fit-off is simplest when the charger class was named at specification stage. The EV-ACT5006T — up to 48 A, hard-wired or NEMA 14-50P, NACS, IP65/IP66, ETL/FCC/CE — is the full-size endpoint a 60 A pre-wire is built for; the EV-ACS3210T portable adjusts from 10 A to 32 A in six steps, suiting a smaller provision. EVDANCE is a Shenzhen manufacturer founded in 2011, exporting to more than 30 countries with a 3-year standard warranty. Shortlist from the product range; open supply terms through the distributor program or contact us.
Frequently Asked Questions
Who buys the charger on a new-build job?
Either firm can. What matters is that the contract names one buyer, states who holds the warranty paperwork, and fixes what happens if a different model is substituted after rough-in — a substitution can change the circuit the pre-wire was sized for.
Is pre-wiring the same as a rough-in inspection?
No. Pre-wiring is the work itself: route, circuit provision and panel space. An inspection is a mid-job check of that hidden work, where local rules require one. The contract decides whose work it is; the inspector only checks it.
The buyer wants a second charger after handover. Is that covered?
Only if the contract said so. A second bay is a variation: it needs its own check against panel capacity, agreed and priced in writing before work starts.
Related Reading
- EV-Ready New Construction: 2026 Building Codes and the Real Cost of Waiting
- What Is a Standard EV Charger Installation?
- What Qualifications Do You Need to Install EV Chargers?
- What Affects EV Charger Installation Cost? 8 Factors to Check
