BS 7671 Compliance Checklist for Electrical Work

Electrical work should not be judged by whether the lights come on. A proper BS 7671 compliance checklist looks at the condition of the installation, the way it is designed, the protective measures in place and the evidence that it has been tested correctly. For homeowners, landlords and businesses, that process provides confidence that work is safe, traceable and suited to the property.

BS 7671, commonly called the IET Wiring Regulations, sets the technical standard for electrical installations in the UK. It applies to new installations, alterations and additions, from a replacement consumer unit or new circuit to solar PV, battery storage and EV charging equipment. The requirements are detailed because electrical safety depends on many connected decisions, not one component in isolation.

What BS 7671 compliance means in practice

Compliance is not simply fitting recognised equipment. The equipment must be selected for the environment, installed in the right way, protected appropriately and verified through inspection and testing. The work must also take account of the existing installation, particularly where a new circuit is being connected to an older consumer unit or earthing arrangement.

A qualified electrician will assess the job before installation starts. This may include the supply characteristics, earthing and bonding, cable routes, likely loads, external influences such as damp or heat, and the condition of existing circuits. For larger commercial or industrial sites, it can also include continuity of operations, isolation arrangements and the effect of additional demand on the building supply.

There is an important distinction here. BS 7671 sets out requirements for electrical installations, but other legal and technical duties may also apply. Building Regulations notification requirements, landlord obligations, fire safety considerations, planning restrictions and manufacturer instructions can all affect a project. A compliant result is based on the whole job, not a single certificate issued at the end.

BS 7671 compliance checklist before work begins

The following checks help ensure electrical work is planned properly rather than adapted as problems appear on site.

• Confirm the scope of work. Establish whether the project is a repair, an addition, an alteration or a full replacement. Adding a socket, fitting a new consumer unit and installing an EV charger carry very different design and certification requirements.
• Assess the existing installation. Check the condition of the consumer unit, earthing arrangement, main protective bonding and accessible wiring. New work cannot make an unsafe existing situation worse.
• Calculate the demand. Consider current and future electrical loads. This is particularly relevant where electric heating, induction cooking, solar batteries or EV charging are being added to a property.
• Choose suitable equipment. Consumer units, protective devices, cables, isolators and accessories must be appropriate for their location and use. Outdoor, bathroom, workshop and plant-room installations need particular care.
• Plan isolation and safe access. There must be a practical way to isolate equipment for maintenance and emergency action. Equipment should not be placed where it is difficult or unsafe to reach.

For domestic work, the survey often identifies whether an older fuse board, inadequate bonding or deteriorated cable insulation needs attention before a new circuit can be added. It may be more cost-effective and safer to address these issues as part of the wider project rather than return to them later.

Design checks for circuits and protection

Good design is where much of the safety is determined. Circuits need to carry their intended load without overheating, while protective devices need to operate quickly enough if a fault develops. Cable size alone is not the answer: installation method, grouping, insulation, ambient temperature and route all affect the cable’s current-carrying capacity.

Earthing and bonding

Earthing provides a route for fault current and helps protective devices disconnect the supply when needed. Main protective bonding connects key metal services, such as water and gas pipes where applicable, to the earthing terminal. The exact arrangement depends on the supply type and property layout, so this should be verified rather than assumed.

Where solar PV, battery storage or EV charging are involved, the earthing design requires additional consideration. Some equipment can introduce alternative supply modes or specific manufacturer requirements. A suitable contractor should consider the complete installation, not treat low-carbon technology as separate from the property’s electrical safety system.

RCD and RCBO protection

Residual current devices, including RCDs and RCBOs, provide additional protection against electric shock and certain fault conditions. Their selection must suit the circuit and connected equipment. For example, modern electronic loads may require a particular RCD type, and splitting circuits across devices can reduce the loss of supply if one circuit develops a fault.

There is a trade-off between retaining an existing consumer unit and upgrading it. In some cases, an addition can be completed safely using compatible protective equipment. In others, an older board, poor circuit identification or lack of suitable protection makes an upgrade the more responsible recommendation.

Cable routes and external influences

Cables need protection from damage, heat and unsuitable conditions. Concealed cables must be routed in recognised safe zones or otherwise protected, while external cables require suitable containment and weather resistance. Garages, gardens, commercial kitchens, agricultural settings and industrial areas all present different risks.

It is also worth considering future access. A neat installation with clear routes and labelled circuits is easier to test, maintain and alter safely. This matters when a property later receives solar panels, a battery or another EV charge point.

Inspection and testing checklist

Testing is not an optional final formality. It verifies that the installation performs as designed and that protective measures operate correctly. Testing should be carried out by a competent person with suitable calibrated equipment, normally during the work and before the installation is put into service.

A typical inspection and test programme will include the following:

• continuity of protective conductors and, where required, ring final circuit conductors;
• insulation resistance to identify damage or unwanted connections;
• polarity checks to confirm switches and protective devices are connected correctly;
• earth fault loop impedance and prospective fault current measurements;
• RCD or RCBO testing, including operating times; and
• functional testing of switches, isolators, controls and installed equipment.

The exact tests depend on the nature of the work. A small addition may be covered by a Minor Electrical Installation Works Certificate if the existing circuit has been verified as suitable. A new circuit, consumer-unit replacement or significant alteration will normally require an Electrical Installation Certificate with schedules of inspections and test results.

Visual inspection is equally important. The electrician should check for secure terminations, correct enclosure ratings, appropriate labelling, adequate blanking plates, cable support and signs of overheating or damage. Test readings are valuable, but they do not replace careful workmanship.

Certification, notification and records

Once the work is complete, keep the paperwork with other property records. Certificates provide evidence of what was installed, what was tested and any observations that need attention. They are useful when selling a property, arranging insurance, managing a rental home or planning future electrical work.

Depending on the project, you may receive an Electrical Installation Certificate, a Minor Works Certificate, an Electrical Installation Condition Report or a Building Regulations compliance document. These documents are not interchangeable. An EICR reports on the condition of an existing installation at the time of inspection; it does not certify new installation work in the same way as an installation certificate.

For landlords and duty holders, records also support ongoing maintenance responsibilities. Commercial premises may need planned periodic inspection based on the installation type, use and environment. A busy workshop or industrial unit may need more frequent attention than a well-maintained domestic property. There is no one interval that suits every building.

When remedial work is needed

An inspection may identify issues that prevent new work from proceeding safely, such as inadequate earthing, damaged accessories, overheating connections, missing circuit identification or unsuitable protective devices. This is not necessarily a sign that every part of the installation must be replaced. The sensible approach is to explain the risk, prioritise essential remedial work and set out any optional improvements clearly.

For an EICR, observations are commonly coded according to their seriousness. A dangerous defect or a condition requiring urgent improvement needs action before the report can be satisfactory. An observation about improvement may not stop the installation being used, but it should still be considered in the context of the property and its occupants.

Clear communication matters here. A contractor should be able to explain what has been found in plain English, why it matters and what work is required, without using technical language to create unnecessary uncertainty.

A checklist supports safer decisions

BS 7671 compliance is best viewed as a disciplined process: survey the property, design for the actual conditions, install carefully, test thoroughly and provide meaningful records. Whether you are arranging an EICR, upgrading a consumer unit, adding solar and battery storage or preparing commercial premises for EV charging, asking the right questions early helps prevent avoidable cost and disruption later.

If you are unsure whether an existing installation can support your plans, arrange an assessment before equipment is ordered. A careful survey and clear recommendations give you a safer starting point and a result that is easier to maintain for years to come.

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