EV Charger Installation Costs: What Drives the Price — Cable Run, Consumer Unit Upgrade, DNO Works

Summary

EV charger installation pricing varies enormously between a simple job (modern consumer unit, short cable run, no PME issues) and a complex one (long underground run, old fuse board, difficult parking location). Electricians who quote flat rates without surveying risk either losing profitable work or underpricing jobs that cost them money.

This article breaks down the cost components of a domestic EV chargepoint installation, explains what drives each cost, and provides guidance for building accurate quotes for customers.

Key Facts

• Chargepoint hardware — typical 7.4kW smart chargepoints from major brands (Zappi, Ohme, Pod Point, Andersen): £450–£900 supply-only
• Standard installation — 32A RCBO, 6mm² cable to 10m, chargepoint on external wall: £350–£500 labour + materials (excluding chargepoint)
• Cable run distance — the dominant variable cost; 6mm² two-core-and-earth costs approximately £2–£4/m; labour to clip, chase, or duct adds further cost per metre; runs over 20m substantially increase cost
• Consumer unit upgrade — if the existing consumer unit has no spare ways or is an old fuse wire board: £400–£600 for a new dual-RCD consumer unit; an additional £600–£900 if a full consumer unit replacement with RCDs per circuit is required
• PME earthing — where a TT earth electrode is needed (most installs on PME/TN-C-S supplies without PEN detection): additional £200–£400 for electrode, test, and connections
• Underground cable — conduit in ground: £15–£30/m for excavation, duct, cable, and reinstatement (more if through tarmac, concrete, or other hard surfaces)
• Surface reinstatement — cutting concrete, tarmac, or block paving for cable routes; £50–£150/m depending on surface; block paving can be relaid more cheaply than concrete resurfacing
• Post-mounting — where a post/bollard is needed instead of wall mounting (parking space away from wall): post and foundation add £150–£400
• OZEV grant — where applicable, £350 per socket deducted from the customer invoice; installer claims from OZEV

Quick Reference Table: Domestic EV Chargepoint Cost Components

Detailed Guidance

What a Standard Installation Covers

A "standard" EV chargepoint installation assumes:

• Modern consumer unit with a spare way for a 32A RCBO
• Short cable run (up to 10m) in surface-mounted trunking or clipped to wall
• PME supply with PEN detection chargepoint (or TT electrode to be installed)
• Chargepoint on external wall directly behind or adjacent to parking space
• No groundworks, no reinstatement

This scenario allows an experienced electrician to complete the job in 3–5 hours. The EIC, commissioning, and handover are included in the day rate.

Cable Run: The Key Variable

For many domestic installations, the cable run is the single biggest variable in the job cost. Factors that increase cable run cost:

Distance: A 6mm² two-core-and-earth cable at £2.50/m costs only £25 for a 10m run — but labour to clip, chase, or duct it adds £10–£20/m. A 30m run adds £300–£450 in cable and fixing, before any surface work.

Indoor route: If the cable must run through a loft, along a corridor, under floorboards, or through multiple rooms to reach the parking location, this dramatically increases time. Allow additional hours for each room traversal or floor crossing.

External route: Surface-clipped on masonry is fast. Chased into a rendered or painted wall requires filling, and potentially redecoration — flag this to the customer upfront.

Underground: Where the cable must cross a garden, driveway, or path, it goes underground in duct (minimum 600mm deep under pathways; 500mm under non-trafficked garden — see BS 7671 Table 52.2). Excavation, duct laying, cable pulling, backfill, and reinstatement add £15–£30/m for soft ground. Double or triple this for tarmac, concrete, or block paving.

Overhead: An overhead cable run between buildings (e.g., from house to garage) must comply with the minimum height clearances in BS 7671 (not less than 3.5m above driveways; 5.2m above roads). Catenary wire suspension is required for unsupported spans over ~3m. These runs are often neater as underground but can be faster for short distances.

Consumer Unit Assessment

The consumer unit must be assessed during the site survey:

• Modern consumer unit (post-2016, dual RCD or RCBO per circuit): likely has space for a 32A Type B RCBO. Add the RCBO and no other board work required. Minimal cost.
• Older consumer unit (pre-2016, single-RCD or split-load): may have spare ways; assess whether a new Type B RCBO will be protected by the existing RCD. Compliance with the 18th Edition amendment A2 requires checking RCD type (Type AC boards are not ideal for EV chargepoints with potential DC leakage). May be acceptable as-is; may require adding an RCD-protected way or upgrading.
• Old fuse wire board or early MCB board without RCDs: a full consumer unit replacement is required before adding the EV circuit. This is a significant additional cost (£500–£900) and must be included in the quote if the survey identifies it.

Consumer unit location: A consumer unit in a garage adjacent to the parking space is ideal. One at the back of the house, with the parking at the front, means a long cable run. Assess during survey.

PME Earthing Cost

Under BS 7671 Chapter 722, an EV chargepoint on a PME (TN-C-S) supply cannot be earthed directly to the PME earth without additional protection, because a PEN conductor fault could make the EV body live. Options:

1. TT earth electrode — install a driven earth rod at the chargepoint; connect the chargepoint earth to this rod only. Cost: £200–£400 (electrode, clamps, connection, earth resistance test). This is the most common approach on domestic installs.
2. PEN fault detection — a chargepoint with built-in PEN fault detection (some Andersen, Easee, and other brands) detects a PEN fault and disconnects the chargepoint automatically. More expensive chargepoint hardware but no electrode required. Cost difference built into chargepoint price.
3. Isolating transformer — rare for domestic; expensive.

Most OZEV-approved chargepoints specify which PME earthing solution they support. Check the chargepoint spec before specifying.

Building an Accurate Quote

A reliable EV charging quote process:

1. Site survey — do not quote without visiting. Check: consumer unit location and spare ways; cable route from board to parking; PME earthing type; cable run distance; surface types; parking space to wall distance
2. Materials take-off — price the cable, RCBO, earthing components, conduit, fixings, post (if needed), and the chargepoint itself at your supplier cost + margin
3. Labour hours — estimate time for: consumer unit work; cable run installation (per metre, by surface type); chargepoint fixing and connection; earthing; testing and commissioning; handover
4. Fixed items — EIC, OZEV claim administration, travel
5. Contingency — for residential installs with uncertain cable routes, 10–15% contingency is prudent
6. OZEV grant — deduct £350 if the job qualifies; advise the customer of the net price

Worked example:

• Chargepoint: Ohme Home Pro 7.4kW (tethered): £620
• 32A Type B RCBO: £35
• 25m cable run, surface clipped externally: £200
• TT earth electrode: £280
• Labour (6 hours at £60/hr): £360
• EIC, consumables: £50
• Subtotal: £1,545 — less OZEV grant £350 = Net: £1,195

When to Walk Away from a Job

Some EV chargepoint jobs are not profitable at market rates. Be alert to:

• Very long cable runs (>50m) through multiple surfaces: price carefully; consider flagging the consumer unit relocation option
• Listed buildings or conservation area restrictions on external cable routes
• Supply upgrade required (DNO works): costs and timescales are outside the electrician's control; manage customer expectations
• Asbestos (pre-2000 consumer units, artex ceilings): any disturbance may require a licensed contractor — flag this

Frequently Asked Questions

Should I include the OZEV grant offset in my quote automatically?

Yes — present the customer with both the gross cost and the net cost after the OZEV grant. Most customers are unaware of the grant. Telling them about the £350 saving builds trust and differentiates you from less knowledgeable competitors. Note: the grant applies to qualifying residential and commercial premises; confirm eligibility at survey.

Is it worth upgrading a consumer unit for EV charging?

The decision depends on the age and condition of the existing board. A consumer unit already scheduled for replacement (e.g., old rewirable fuse board, failing RCDs) should be upgraded as part of the EV job. If the existing board is a modern, compliant unit with one spare way, adding the RCBO is far cheaper than a full replacement. However, if the customer has other electrical work planned, bundling the consumer unit upgrade makes sense.

How do I price for a job where the cable has to go underground through a concrete driveway?

Core-and-cut through concrete is the most expensive reinstatement: hire of a disc cutter or core drill, cutting the slot, installing duct, backfilling with mortar, and making good the surface. Expect £50–£120/m for the reinstatement alone, plus the cable and duct cost. This is a significant cost — advise the customer upfront and consider whether a surface-mounted run (in steel conduit on the side of the driveway) might be more cost-effective.

Regulations & Standards

• BS 7671:2018+A2:2022 — Chapter 722: EV chargepoint circuit requirements

• Electric Vehicles (Smart Charge Points) Regulations 2021 (SI 2021/1467) — chargepoint specification requirements

• Building Regulations Part P — notifiable electrical work in dwellings

• IET Guidance Note 7 — EV Charging — installation design guidance

• OZEV EV Chargepoint Grant — current grant amounts and eligibility

• NICEIC EV charging guidance — installer requirements and EIC documentation

• ev charger installation types — chargepoint hardware options

• bs 7671 ev wiring requirements — circuit design requirements

• pme earthing ev charging — TT electrode installation and PME treatment

• ozev approved installer — grant eligibility and claim process

• ev charger testing commissioning — commissioning and EIC requirements