How to Price an EV Charger Installation: Labour, Materials and Margin Guide

Quick Answer: A domestic 7kW EV charger installation in the UK prices at £800-£1,400 supplied and fitted for a straightforward job (charger near the consumer unit, short cable run, spare CU way), rising to £1,500-£2,500 where a long cable run, a CU upgrade, or earthing works are needed. The charger unit is £400-£900; the rest is the dedicated 32A circuit, the earthing arrangement (PEN fault protection on PME supplies), and the cable run. The installer must be competent under BS 7671 Section 722, notify the DNO, and the install is notifiable under Part P.

Summary

Home EV charging has become one of the highest-volume jobs in the domestic electrical trade. Pricing it well means understanding that the charger box is the cheap part — the cost lives in the dedicated circuit, the cable run length, the earthing solution, and any consumer-unit or supply work. A charger mounted next to the consumer unit with a spare way is a half-day job; one at the far end of a drive on a PME supply needing an earth rod and a CU upgrade is a full day with significantly more materials.

The defining technical issue is earthing on PME (TN-C-S) supplies, which most modern UK homes have. A combined neutral-and-earth (PEN) conductor fault could, in the open air at a car, present a dangerous touch voltage. BS 7671 Section 722 requires this to be addressed — historically with an earth rod (TT island), now most commonly with a charger incorporating built-in PEN fault detection (an "O-PEN" device) that disconnects on a PEN fault. Which solution you use changes both the method and the price.

This guide separates the charger, the circuit and cable run, the earthing arrangement, the protective devices, the DNO notification, and the available grants. It covers the load-management angle for homes near supply capacity, and the commercial/workplace variant. For the technical detail behind the pricing see ev charger installation types and pme earthing ev charging; for grants and DNO see dno g98 g99 applications.

Key Facts

Charger and material costs

Labour and ancillary costs

Regulatory and standards

Quick Reference Table

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Scenario Earthing CU Work Typical Total
Charger by CU, PME with O-PEN charger O-PEN device Spare way £800-£1,200
Medium run, PME, O-PEN charger O-PEN device Spare way / Henley £1,000-£1,500
Long run / TT solution (earth rod) Earth rod + RCBO £1,300-£2,000
Install + CU upgrade O-PEN or rod New CU £1,500-£2,500
Buried cable across drive varies varies +£40-£90/m trench

A 7kW charger draws 32A continuous — it must be on a dedicated circuit with appropriate RCD protection (Type A or B per the charger spec).

Detailed Guidance

Survey: the five questions that set the price

  1. Where is the consumer unit relative to the parking spot? Cable run length drives both material and labour, and long runs may need a larger cable for voltage drop.
  2. Is there a spare way and capacity in the CU? A full or old board means a Henley tap-off or a CU upgrade.
  3. What is the earthing system? PME (TN-C-S) — the common case — requires a PEN-fault solution. TT (earth rod already) is simpler in one sense.
  4. What is the main supply rating and existing load? 60/80A mains with electric showers, hobs, and heat pumps may not have headroom for 32A more — load management or a supply upgrade may be needed.
  5. What is the cable route? Surface clip, through walls, or buried (trenching/ducting) — buried runs are far more labour.

Earthing on PME supplies — the core compliance issue

On a TN-C-S (PME) supply, BS 7671 Section 722 requires protection against the hazard of an open-PEN fault at the vehicle. The two mainstream solutions:

  1. O-PEN charger (PEN fault detection built in) — the modern, most common approach. The charger monitors for a PEN fault and disconnects all live conductors (including earth) if it detects one, so no earth rod is needed. Most current smart chargers include this. Simplest and cleanest install.
  2. TT island (earth rod) — disconnect the charge point's earth from the PME earth and provide a dedicated earth electrode (rod) with appropriate RCD protection. Used where the charger has no O-PEN device or where site conditions favour it. Adds £80-£200 and requires testing the rod resistance.

Choosing and pricing the right earthing solution is the single most important judgement on an EV install. See pme earthing ev charging for the full technical treatment.

Protective devices

The circuit needs RCD protection appropriate to the charger. Many chargers require Type A RCD protection and include internal 6mA DC fault detection (RDC-DD), so an external Type A RCBO suffices; others require Type B if they don't have internal DC detection — Type B RCDs are considerably more expensive. Always read the charger manufacturer's installation manual: it specifies the required RCD type, the O-PEN status, and the upstream protection. Getting this wrong is both a safety and a compliance failure.

DNO notification

EV chargers must be notified to the Distribution Network Operator. For a single 7kW (32A, single-phase) charger this is a G98 connect-and-notify (the install can usually proceed and be notified), commonly done through the industry "Connect Direct" portal. Larger or multiple installations, or those near capacity limits, may require a G99 application with the DNO's prior approval — which can add weeks. Factor the DNO process into the timeline (it is usually free but not instant). See dno g98 g99 applications.

Load management — avoiding a supply upgrade

Where the home's main supply can't comfortably take another 32A continuous load, a load-management/CT-clamp system can throttle the charger when the rest of the house demand is high, keeping the total within the main fuse rating. This is far cheaper than a DNO supply upgrade and is increasingly standard. A CT clamp on the main tails feeds the charger's dynamic load balancing. See load management ct clamp.

Grants

The OZEV EV chargepoint grant landscape has narrowed over time — the original homeowner grant for those with off-street parking closed, but grants remain for flat owners/renters, people in rental accommodation, and landlords, plus the Workplace Charging Scheme for businesses. Always check current OZEV eligibility and amounts rather than quoting a figure; the installer must be OZEV-authorised to claim. Treat any grant as a reduction to the customer's net cost, not a change to your install price.

Hidden costs and margin

The five most-missed lines: (1) CU upgrade when the board is full or non-compliant; (2) Type B RCD cost when the charger lacks internal DC detection; (3) trenching/ducting for buried cable across a drive; (4) supply/load issues needing a DNO upgrade or load management; (5) making good brick/render where cable passes through walls. Quote the standard install firm and the variables as clearly stated provisional items.

Frequently Asked Questions

Why do EV charger quotes vary so much?

Because the charger box is a small part of the cost. Two homes with the same charger can differ by £1,000+ depending on cable run length, whether the consumer unit needs upgrading, the earthing solution required on a PME supply, and whether cable must be buried. A proper survey identifies these so the quote reflects the actual install, not a headline "fitted from £X" figure.

Do I need an earth rod for my EV charger?

Not usually with a modern charger. Most current smart chargers include PEN fault detection (an O-PEN device) that satisfies BS 7671 Section 722 on PME supplies without an earth rod. An earth rod (TT solution) is needed where the charger lacks O-PEN protection or where site conditions require it. Your installer determines this from the supply type and the charger's spec.

Is an EV charger installation notifiable?

Yes — it is a new dedicated circuit and is notifiable under Building Regulations Part P, requiring certification by a registered competent person. It must comply with BS 7671 Section 722, and the DNO must be notified (G98 for a standard single charger, G99 for larger installs). The installer should also be OZEV-authorised if a grant is being claimed.

Will my home's supply cope with a charger?

A 7kW charger adds 32A of continuous demand. Combined with electric showers, induction hobs, and heat pumps this can exceed an older 60/80A main fuse's headroom. Options are a load-management system (CT clamp) that throttles the charger when household demand is high, or a DNO supply upgrade to 100A. Load management is usually the cheaper, faster solution.

Regulations & Standards