More Surrey homeowners are buying an EV charger before speaking to an electrician. It may be bundled with the car, advertised by an online retailer, recommended by a friend or available as a cheap import. The plan is simple: buy the wallbox yourself, then find someone to fit it.
Sometimes that is perfectly reasonable. Sometimes it creates problems with compliance, grants, warranties or the electrical supply.
That is why some installers say yes to customer-supplied chargers while others refuse them. The important question is not simply who bought the box. It is whether the charger is suitable, properly documented and compatible with the property.
The short answer: both routes can work
A competent electrician can install a customer-supplied charger if the unit is suitable and the installation can be designed to comply with the current requirements of BS 7671, including Section 722 for electric vehicle charging.
However, when the installer supplies the charger, you usually receive:
- One point of responsibility for the equipment and installation
- A charger selected for your earthing system and electrical supply
- Better access to manufacturer support
- A clearer warranty position
- A better chance of qualifying for an available OZEV grant
- Less risk of needing a second visit because parts or documentation are missing
For most customers, supplying and fitting the charger as one package is the simpler option. Customer supply can still make sense where the vehicle came with a charger or you already own a particular model.
What must be checked before fitting a charger?
Before installing any wallbox, an electrician should check more than its appearance and power rating.
1. Product markings and standards
The unit should have appropriate UKCA or CE marking, a manufacturer’s declaration of conformity and clear technical documentation. Look for evidence that the equipment is designed to the relevant EV charging standards, including:
- BS EN 61851 for conductive electric vehicle charging systems
- BS EN 62196 for plugs, socket-outlets, vehicle connectors and inlets
- A suitable outdoor IP rating
- Rated voltage and current
- Earthing and protection requirements
- Installation and commissioning instructions
IP54 may be adequate in some protected locations, but IP65 or IP66 generally provides greater protection where a charger is fully exposed to rain and dust. The correct rating depends on the charger’s position and the manufacturer’s instructions.
2. RCD and DC leakage protection
Under BS 7671 Section 722, the installation needs suitable protection against electric shock and fault currents. Many modern chargers have built-in 6mA DC leakage detection and are designed to work with Type A RCD protection.
That still needs to be confirmed from the manufacturer’s documentation. If the charger does not provide the required DC protection, a different protective arrangement may be needed. A cheap unit with vague instructions can therefore create additional cost, or be unsuitable for installation.
3. Open-PEN protection
Many UK homes have a PME or TN-C-S earthing arrangement. Where an EV charger is located outdoors, special consideration is needed because of the risk associated with an open-PEN fault.
In practical terms, the installer may need to use one of the recognised approaches under Section 722.411.4.1, such as:
- A charger or separate device with verified open-PEN protection
- An installation earth electrode designed to keep the voltage within the required 70V limit
- A suitable TT earthing arrangement
The right solution depends on the property, supply and charger design. A customer-supplied unit must have reliable documentation confirming what protection it supports.
4. Smart charge point requirements
The Electric Vehicles (Smart Charge Points) Regulations 2021 apply to most private domestic and workplace charge points sold in Great Britain. Relevant units generally need smart functionality, a default off-peak schedule, a randomised delay, commonly up to 10 minutes, to avoid simultaneous switching, and specified cyber-security features.
This means not every cheap unit can legally be sold as a new smart charge point for use in Great Britain. If a marketplace listing does not clearly identify the manufacturer, compliance information, software support or warranty arrangements, proceed carefully.
You can read the official Smart Charge Points Regulations guidance before buying.
Grants: the charger and installer both matter
Grant eligibility is another reason to decide before ordering equipment.
For schemes administered through the Office for Zero Emission Vehicles, eligibility generally depends on both:
- The chargepoint being on the relevant OZEV-approved model list
- The work being completed by an OZEV-authorised installer
Buying a charger yourself does not automatically disqualify it. However, if the exact model is not on the approved list, or the installer cannot claim under the relevant scheme, the grant may not be available.
Grant rules, eligible property types and approved model lists can change, so check the current GOV.UK EV chargepoint grant guidance before buying. Ask the installer to confirm grant eligibility in writing rather than relying only on a retailer’s advertising.
Warranty, insurance and responsibility
When an installer supplies the charger, there is normally a clear division of responsibility:
- The manufacturer warrants the charger hardware
- The electrical contractor warrants the installation and workmanship
- The installer deals with commissioning, settings and certification
With a customer-supplied unit, the electrician can certify the installation but may not be willing to warrant the hardware. If the charger fails, is recalled or cannot connect to its app, you may need to deal directly with the online seller or manufacturer.
Some installers will also charge for a second visit if the unit is faulty, incomplete or missing a required accessory. A full invoice covering supply, installation, testing and certification is useful for your records and may be important if you need to make an insurance claim.
ADS Electrical provides a 24-month workmanship warranty. Where we supply the charger, the hardware is also covered by the relevant manufacturer’s terms.
What should you receive after installation?
Whether you bought the charger or the installer supplied it, a compliant installation should be fully tested and documented. Ask for:
- An Electrical Installation Certificate
- Building Regulations Part P notification or evidence of how compliance has been notified
- DNO notification, where required for the charger and local network arrangements
- A handover record showing the charger model, settings, protection and commissioning information
- Manufacturer instructions and warranty details
- Confirmation of how smart scheduling, load management and app controls work
A professional electrician must certify the electrical installation as a whole. Customer supply does not remove the need for proper design, testing or certification.
What does it cost?
ADS Electrical’s supplied-and-fitted price for a standard domestic installation is typically £895–£1,250. If the consumer unit needs upgrading, allow approximately £200–£500 extra. In our experience, roughly 40% of Surrey properties need some form of board work or additional consumer-unit solution before a charger can be installed safely.
Here is an illustrative self-supply example:
| Item | Example cost |
|---|---|
| Customer-bought charger | £550 |
| Labour-only installation | £300 |
| Consumer unit work | £350 |
| Possible second visit or missing accessories | £100 |
| Illustrative total | £1,300 |
That route could be cheaper if the charger is genuinely suitable and no board work is required. It may also become more expensive than a supplied-and-fitted package once labour, accessories, certification and the loss of a grant are included.
A self-supplied charger can be the right decision when it was bundled with your vehicle, you already own a specific approved model or you have independently confirmed that it is compatible with the proposed installation.
Local issues around Redhill and Surrey
A survey is particularly valuable in this area.
Older 1930s semis and Victorian terraces around Earlswood, St John’s, Linkfield and Meadvale may have 60–100A supplies, older fuse boards and no spare ways. Some terraces may also have looped supplies, which can require coordination with the DNO.
Detached garages and long driveway runs around Nutfield, Salfords, Bletchingley and Whitebushes can require substantial cable routes, additional protection or trenching. The cheapest online charger does not account for those installation conditions.
For a business with two charging bays, such as an office, gym, workshop or small commercial premises, the design may involve load management, a larger supply, three-phase equipment or DNO review. Three-phase and multi-bay schemes are more common around Holmethorpe, Salfords and the A23/A25 corridor.
Ordering first and hoping the unit will fit later is rarely the best approach.
Supply it yourself if…
Customer supply may be suitable when:
- Your car dealer supplied the charger as part of the purchase
- You already own a named, documented charger
- You have checked the model against the relevant OZEV list
- The manufacturer provides UK support and installation instructions
- The installer has agreed in advance to fit that exact model
- You accept that hardware warranty responsibility may remain with the seller
Let the installer supply it if…
Installer supply is usually preferable when:
- You want one company responsible for the complete installation
- You may qualify for a grant
- You are unsure which charger suits your car, driveway or tariff
- The property has an older consumer unit or uncertain earthing
- You want load management, solar integration or a two-car solution
- You want straightforward warranty and aftercare support
Questions to ask before buying
Ask any installer:
- Are you NICEIC registered or approved under another recognised competent person scheme?
- Will you test, certify and notify the complete installation?
- Do you accept customer-supplied chargers, and what documentation do you require?
- Which models do you fit, and why are they suitable for my supply?
- Is load management included if I have more than one charger or limited supply capacity?
- Does the charger have built-in 6mA DC detection and open-PEN protection?
- What is covered by your workmanship warranty, and who handles hardware faults?
- Will the installation remain grant-eligible if I buy the charger myself?
Common mistakes include buying before checking supply capacity, assuming a bundled charger is smart-compliant, importing a unit with no UK support, choosing a tethered charger when an untethered model would suit the drive better, and forgetting to budget for consumer-unit work.
If you are comparing EV charging solutions Redhill, ADS Electrical can survey the property, advise on the charger and provide a clear supplied-and-fitted quote. We also install customer-owned units where they are suitable and properly documented.
Frequently asked questions
Can I supply my own EV charger?
Usually, yes, provided the charger is suitable, documented and compatible with the electrical installation. The installer should approve the exact model before you buy it.
Will ADS Electrical fit a charger I bought online?
We can consider customer-supplied equipment, subject to its condition, compliance information, protection requirements and suitability for the property. Contact us before ordering.
Does customer supply affect the charger warranty?
It can. The manufacturer’s warranty normally remains with the seller or manufacturer, while the electrician’s warranty covers their workmanship. Ask for the division of responsibility in writing.
Does buying my own charger affect a grant?
It may. Grant eligibility generally requires both an approved charger model and an authorised installer. A customer-bought unit can remove grant eligibility if either condition is not met.
What if the charger is second-hand?
A second-hand charger may be difficult to verify. It could have outdated software, missing accessories, no transferable warranty or unknown damage. An installer may refuse it if its compliance and safety cannot be established.
Can I buy a cheaper charger online?
You can, but compare the complete installed cost. Check UKCA or CE marking, relevant standards, IP rating, smart-charge compliance, open-PEN protection, manufacturer support and warranty before buying.
Do I need a consumer-unit upgrade?
Not always, but older boards may have no spare capacity, inadequate RCD protection or other issues. ADS Electrical checks this during the survey and can price any necessary work separately.
Can you install two chargers for a small business?
Yes. Two-bay installations need an assessment of supply capacity, cable routes, protection and load management. Three-phase supplies may be appropriate for some commercial sites, but the vehicle and network capacity must also be checked.
Get the right charger and installation first time
ADS Electrical is a NICEIC Approved Contractor providing domestic, commercial and industrial electrical services across Surrey. We offer free surveys and free quotes within 24 hours, full project management, coordination with other trades and a 24-month workmanship warranty.
For a reliable home charging point Surrey homeowners can depend on, call 07870 554498 or email [email protected].
We serve Redhill, Reigate, Merstham, Earlswood, Nutfield, Salfords, Whitebushes, Linkfield, Meadvale, St John’s, Bletchingley, Holmethorpe and surrounding Surrey areas. Our 24-hour emergency line is also available when urgent electrical support is needed.