Commercial Lease Handover EICR London: Electrical Checks Before Taking or Returning Premises
17 August 2026
A three-phase commercial electrical installation is not simply a larger version of the system found in a flat. It may distribute substantial electrical loads across several boards, floors, kitchens, workshops, plant rooms or tenant areas. It can also support equipment that a business cannot casually switch off. That makes the quality of the inspection and the planning behind it especially important.
If you are looking for a reliable three phase EICR London service, the first questions are usually practical: How much will it cost? How long will it take? Does every circuit need testing? Will the power have to be switched off? Can the work be completed while the building remains occupied?
The honest answer is that a reliable quotation cannot be based on floor area alone. A compact restaurant with three distribution boards and numerous high-load circuits may require more planning than a much larger open-plan office. A workshop may contain machinery that needs controlled isolation. A managed building may include landlord supplies, tenant supplies and common services that must be clearly separated before testing begins.
This guide explains how a professional commercial EICR should be scoped, priced and delivered. It is designed for business owners, facilities managers, managing agents, landlords and responsible persons who need meaningful evidence about the condition of an electrical installation—not merely a document for a compliance folder.
For a direct overview of our inspection service, visit our commercial EICR certificates in London page.
An Electrical Installation Condition Report, commonly called an EICR, records the condition of a fixed electrical installation at the time of inspection and testing. Its purpose is to determine whether the installation is satisfactory for continued use and to identify damage, deterioration, defects or conditions that may create danger.
The inspection concerns the fixed installation: distribution equipment, protective devices, wiring systems, earthing and bonding arrangements, circuits, accessories and permanently connected equipment within the agreed extent of the report. It is different from PAT testing, which concerns electrical equipment rather than the complete fixed installation.
In a three-phase system, electrical power is distributed using three alternating phases. This arrangement is common where a property has higher power requirements or must serve substantial commercial equipment. It can improve load distribution and support equipment that would be unsuitable for a typical single-phase supply.
Three-phase installations are routinely found in:
Offices and multi-floor commercial buildings
Restaurants, cafés and commercial kitchens
Retail units, salons and supermarkets
Warehouses, workshops and industrial units
Schools, academies and education facilities
Hotels and serviced buildings
Healthcare and specialist premises
Landlord and communal areas in managed blocks
Properties containing lifts, pumps, HVAC plant or commercial machinery
The presence of a three-phase intake does not automatically make an installation unsafe or unusually complicated. It does mean the inspection must be planned by someone who understands three-phase distribution, protective devices, phase balance, isolation requirements and the operational risks of interrupting commercial loads.
The Health and Safety Executive’s guidance on the Electricity at Work Regulations 1989 is relevant to work activities and premises and explains the duties placed on those responsible for electrical safety. An EICR is one recognised way of producing structured evidence about the condition of a fixed installation, but the report must reflect the actual property and the agreed inspection not a generic template.
Floor area matters, but it is rarely the strongest cost driver. The number of distribution boards, final circuits, operational restrictions and unknowns usually have a greater effect on the work required.
A credible commercial quotation should consider:
Each board must be located, identified and associated with the correct area or equipment. A property may have a main switchboard plus sub-distribution boards in kitchens, plant rooms, workshops, upper floors or tenant spaces. Old alterations can make this hierarchy difficult to follow.
A board with 12 straightforward lighting and socket circuits is different from a board with numerous three-phase ways, motor circuits, mechanical plant, data equipment and sensitive electronic loads. Circuit count affects inspection time, testing time, documentation and the amount of operational coordination required.
Clear, accurate labels save time and reduce uncertainty. Missing, duplicated or incorrect circuit identification means the engineer may need additional tracing before safe isolation and meaningful testing can proceed. Our guide to incorrect circuit labelling on an EICR explains why poor identification is more than an administrative inconvenience.
Boards may be inside locked cupboards, ceiling voids, stock rooms or tenant-controlled areas. Equipment may be obstructed or inaccessible during trading hours. If keys, permits or authorised personnel are unavailable, the inspection may be delayed or recorded with limitations.
Some tests require circuits or equipment to be safely isolated. That can affect computers, refrigeration, cooking equipment, alarms, access controls, lifts, production machinery, servers or building services. The inspection plan should identify essential systems before anyone starts switching circuits off.
An installation with clear records, modern boards and controlled access is generally easier to inspect than one that has been altered repeatedly without updated schedules or certification. Mixed-use buildings can also require careful separation between landlord, tenant and specialist systems.
This is why a very low quotation based only on the words “commercial unit” can be misleading. The price may later change when the number of boards and circuits becomes clear, or the inspection may be rushed to fit an unrealistic allowance. Our broader commercial EICR cost guide explains the main pricing principles in more detail.
The fastest way to receive a realistic quotation is to provide useful information at the beginning. For a three-phase commercial EICR, we recommend sending:
The full property address
The type and use of the premises
Approximate floor area and number of floors
Number of distribution boards
Approximate number of circuits on each board
Clear photographs of every distribution board and its circuit schedule
A copy of the previous EICR, if available
Normal operating hours
Any circuits that cannot be interrupted during those hours
Parking, loading, security or permit requirements
Details of recent electrical alterations
Any known faults or recurring tripping
Whether out-of-hours testing may be required
Photographs are particularly valuable. A clear image of the board with its cover closed, another of the labels or schedule, and a wider image showing access around it can reveal far more than a brief description.
Where a site is large or the records are incomplete, a pre-inspection survey may be the most efficient route. This allows the scope, access plan and likely shutdown requirements to be agreed before the main inspection team arrives.
You can also review the information covered by our wider EICR services before requesting a quotation.
There is no responsible universal answer. Duration depends on the extent of the installation and the conditions under which the engineer can work.
A small commercial unit with one accessible board and a modest number of correctly labelled circuits may be completed within part of a working day. A larger office, restaurant, school or workshop can require a full day, several engineers, phased attendance or multiple visits. A complex building with 100 to 150 circuits should not be treated as though it were a standard residential inspection.
The following are planning examples, not fixed promises:
| Installation profile | Likely planning approach |
|---|---|
| One board, limited circuits, good access | Single planned attendance may be suitable |
| Several boards across an occupied property | Zoned or phased inspection likely |
| Numerous circuits with incomplete schedules | Additional tracing and verification allowance |
| 100–150+ circuits | Detailed pre-planning, potentially multiple engineers or visits |
| Critical loads or restricted shutdowns | Out-of-hours or agreed isolation windows |
| Multi-tenant or managed building | Access coordination and clear definition of inspection boundaries |
The goal is not to keep the engineer on site for as long as possible. It is to provide enough competent time to inspect, test, record and assess the agreed installation without creating avoidable disruption or false confidence.
For additional context, see our article on how long an EICR takes in London.
Some interruption should usually be expected. The precise extent depends on the installation, the tests required and the agreed limitations.
An EICR combines visual inspection with electrical testing. Certain tests require safe isolation, and some involve disconnecting or separating conductors. It is not sensible to promise a complete commercial inspection with no effect whatsoever on the electrical supply before the installation has been assessed.
However, good planning can reduce disruption significantly. Options may include:
Testing one board or area at a time
Agreeing short isolation windows with the site manager
Completing disruptive work before opening or after closing
Coordinating with IT, kitchen, maintenance or production teams
Identifying critical loads in advance
Using a multi-visit plan for a continuously occupied site
Recording agreed operational limitations clearly
The person responsible for the premises should identify equipment that must not be isolated without a controlled procedure. Examples include refrigeration containing stock, server equipment, medical or care systems, security controls, fire-related interfaces, lifts and production lines.
An inspection should never proceed by casually switching unidentified circuits. Accurate schedules, responsible site contacts and a planned method make the work safer and more efficient.
This question needs a precise answer because “tested” can mean different things to different people.
The report should define its extent and any limitations. The engineer must gather sufficient inspection and test evidence to reach a competent conclusion about the installation within that scope. The approach may include agreed sampling where appropriate, but sampling must be reasoned, representative and recorded. It must not be used as an excuse to conduct a superficial inspection.
For an existing commercial installation, access, operational restrictions, inaccessible wiring and sensitive connected equipment may prevent every possible inspection or test. Where a limitation exists, it should be agreed where appropriate and documented—not hidden.
Property managers should therefore ask four questions before accepting a quotation:
What parts of the installation are included?
What level of inspection and testing is proposed?
Are any operational limitations anticipated?
How will those limitations be recorded on the report?
A suspiciously short appointment for a large installation often signals a mismatch between the building and the proposed scope. The right question is not “Can this be done fastest?” but “Will the agreed inspection produce reliable evidence about continued use?”
The exact work depends on the installation, but a properly scoped inspection commonly considers:
Supply characteristics and earthing arrangements
Main protective bonding
Main switchgear and means of isolation
Distribution boards and protective devices
Identification, notices and circuit schedules
Signs of overheating, damage or deterioration
Suitability of enclosures and barriers
Cable condition and installation methods where accessible
Protective conductor continuity
Insulation resistance
Polarity
Earth fault loop impedance and protective-device performance
RCD operation where applicable
Suitability of equipment for the environment
Evidence of unauthorised or poorly coordinated alterations
Recorded test results for circuits within the agreed scope
The inspector is assessing safety and suitability for continued use, not simply whether equipment looks modern. An older installation does not automatically fail because it does not match every feature of a new installation. Equally, a relatively new board does not guarantee that circuit design, labelling, earthing or workmanship is satisfactory.
If you manage specialist premises, our dedicated guides cover office EICRs in London, restaurants and commercial kitchens, warehouses and workshops and schools and academies.
Commercial installations often evolve as businesses change. New equipment is installed, rooms are repurposed, tenant areas are divided, contractors add circuits and old equipment is removed. If records do not keep pace, the installation becomes harder to operate and inspect safely.
Common observations can include:
A protective device should correspond clearly with the circuit it controls. Incorrect labels can make isolation unsafe and extend testing time.
High-load equipment and sustained demand can expose weak terminations or unsuitable connections. Visible thermal damage, discolouration or deterioration requires careful assessment.
Protective measures depend on effective earthing and bonding arrangements. Missing, inadequate or poorly connected conductors may present a serious concern.
Protective devices must be appropriate for the circuit, conductors, fault conditions and connected equipment. Mixed or incompatible components may require further assessment rather than assumptions based on appearance alone.
Deteriorated cables, moisture, damaged equipment or connected electronic loads can affect results. The engineer must understand what is connected and interpret measurements correctly.
An EICR is not the same as an Electrical Installation Certificate or Minor Electrical Installation Works Certificate. Our guide comparing EICRs, Electrical Installation Certificates and Minor Works Certificates explains the difference.
Stock, fixed furniture or locked areas can prevent safe inspection. Access problems should be resolved before the visit wherever possible.
Commercial loads change over time. Additional appliances, equipment or workstations may be added without a full review of the original arrangement.
These issues are not proof that every commercial property will fail. They show why a condition report must examine the real installation instead of relying on age, appearance or assumptions.
An EICR records observations using classification codes. The overall result depends on the applicable reporting requirements and the codes attributed by the competent inspector.
As of August 2026, the industry is in a transition period. The IET confirms that BS 7671:2018+A4:2026 has been published, while the previous Brown Book incorporating Amendment 3 remains valid until 15 October 2026. During the transition, work may be carried out to either valid edition. You can read the IET’s current BS 7671 edition guidance.
This transition matters because Amendment 4 changes the presentation and effect of the FI classification. The IET explains that under the new form, C1 and C2 observations lead to an unsatisfactory outcome, while C3 and FI are advisory rather than automatically making the report unsatisfactory. The report should make clear which standard and form have been used.
In practical terms:
C1 indicates danger present and requires immediate attention.
C2 indicates a potentially dangerous condition and requires remedial action.
C3 is a recommendation for improvement.
FI concerns further investigation, with its treatment depending on the valid edition and reporting form used during the transition.
The wording of an observation should be specific enough for the client to understand the location, the issue and the next action. A list of vague codes without meaningful descriptions is not an elite commercial report.
An unsatisfactory report is not automatically a demand to rewire the entire building. The appropriate response depends on the observations.
The sensible process is:
Review every observation and its location.
Identify any immediate safety action.
Obtain a properly itemised remedial quotation.
Coordinate access and shutdown requirements.
Complete the necessary work using suitable certification.
Retest or verify the affected parts as required.
Retain the original report and all completion evidence together.
Some properties need targeted repairs, improved labelling, replacement accessories or corrective work at individual boards. Others contain widespread deterioration or historical alterations that make a larger upgrade more economical. The decision should follow evidence, not a sales script.
Our failed-EICR remedial work service explains how corrective work can be assessed and documented.
The following is a realistic planning scenario based on the type of enquiries commercial inspection companies receive. It is illustrative and does not claim to describe a named customer or completed Codeex project.
A facilities manager requests a quotation for an occupied London property with a three-phase supply and approximately 150 circuits. The initial request asks whether one engineer can complete the inspection in two to four hours.
At first glance, that duration is unlikely to be credible. The correct response is not to guess a larger number immediately, but to collect the information needed to build a safe scope.
The facilities manager is asked to provide:
Photographs of the main switchboard and all distribution boards
Circuit schedules and previous test results
The number of floors and operational areas
Details of plant, kitchens, IT systems and tenant equipment
Opening hours and permitted isolation windows
Information about recent alterations
This reveals that the 150 circuits are spread across several boards serving office floors, mechanical plant, a catering area and common services.
General office circuits may be scheduled by zone. Catering circuits require coordination outside service periods. Mechanical equipment needs input from the building-maintenance team. Server and access-control supplies must not be interrupted without approval.
Instead of treating the building as a single uninterrupted job, the inspection is divided into controlled work packages.
The client and inspection provider agree which boards, circuits and areas are included, what access will be available and which operational limitations are unavoidable. Any excluded specialist system is identified clearly rather than silently omitted.
The likely solution is a multi-engineer or multi-visit programme with defined isolation windows. This may cost more than a rushed single attendance, but it reduces business risk and produces a report that can be defended and acted upon.
The final deliverable should include clear board references, test schedules, observations, classification codes, agreed limitations and the recommended date for the next inspection. If remedial work is required, the facilities manager can prioritise it by risk and location rather than trying to decode a vague certificate.
The central lesson is simple: 150 circuits are not a two-hour paperwork exercise. Proper scoping protects the client, the occupants, the engineer and the reliability of the final report.
The cheapest way to manage a commercial EICR is not necessarily to choose the lowest headline quotation. It is to remove avoidable uncertainty and prevent failed access, repeated visits and uncontrolled shutdowns.
Before the inspection:
Confirm every board location and obtain keys.
Clear safe working space around electrical equipment.
Provide accurate schedules and previous reports.
Nominate an authorised site contact.
Tell occupants when local interruptions may occur.
Back up sensitive IT systems.
Identify refrigeration, servers, alarms and specialist plant.
Agree any permit-to-work procedure.
Arrange out-of-hours access where necessary.
Confirm parking, loading and security arrangements.
During the inspection, the site contact should be reachable and authorised to make operational decisions. After the inspection, store the report with previous certificates, remedial evidence and updated schedules. Good records make the next inspection faster and support maintenance decisions between formal reports.
For businesses in the City, West End and surrounding commercial districts, our Central London commercial EICR guide covers additional access and scheduling considerations.
Three-phase inspection requires more than the ability to produce an EICR form. Before appointing a provider, confirm that they can demonstrate appropriate competence, calibrated test equipment, suitable insurance and experience with the scale and type of installation involved.
Ask how they will:
Scope the number of boards and circuits
Manage isolation and occupied areas
Record limitations
Identify circuits and board references
Deal with critical loads
Provide test schedules and observations
Explain unsatisfactory findings
Quote and certify remedial work
Protect business continuity
Be cautious if a provider offers a fixed price and extremely short duration without asking about board count, circuit count or access. Speed is valuable only when it comes from organisation and experience—not from reducing the inspection below a credible level.
You can learn more about our company and approach on the About Codeex Maintenance page and view examples of our wider work in recent projects.
A commercial EICR should give you a clear, evidence-based view of the fixed electrical installation and a practical route forward. For three-phase premises, that begins with correct scoping.
Send us the property address, building use, number of distribution boards, approximate circuit count, operating hours and clear board photographs. If available, include the previous EICR and details of any critical equipment or restricted shutdown periods.
We can then assess the likely inspection plan, attendance requirements and quotation on the facts of the property—not on a generic price that may change later.
If you are responsible for an office, restaurant, school, warehouse, retail unit or multi-board commercial building, book your commercial EICR assessment or call 0203 811 8331 to discuss the site.
A proper EICR is not just a certificate. It is a controlled technical assessment of whether an electrical installation is suitable for continued use and the larger the installation, the more important that control becomes.
Clear answers for London business owners, landlords, facilities managers and managing agents planning an EICR for a three-phase commercial electrical installation.
A three-phase commercial EICR is an Electrical Installation Condition Report for a property supplied by a three-phase electrical system. It assesses whether the fixed electrical installation is satisfactory for continued use within the agreed scope of the inspection.
The work can include inspection and testing of switchgear, distribution boards, protective devices, earthing and bonding, wiring systems, final circuits and permanently connected equipment. It is not simply a visual check and it is different from PAT testing.
Learn more about our commercial EICR certificates in London.
The cost depends mainly on the number of distribution boards, circuit count, access, operational restrictions and agreed extent of testing. Floor area alone is not enough to price a commercial installation accurately.
A small unit with one clearly labelled board will normally require less work than a restaurant, office or workshop containing several boards, critical equipment and 100 or more circuits. Out-of-hours attendance, incomplete schedules and circuit tracing can also affect the quotation.
For accurate pricing, send clear board photographs, circuit schedules, the previous EICR and details of any shutdown restrictions. You can also review our commercial EICR cost guide.
There is no reliable universal duration. A modest, accessible installation may be suitable for one planned attendance, while a multi-board property can require a full day, several engineers, multiple visits or phased testing outside normal operating hours.
A property with approximately 100–150 circuits should not be treated like a residential inspection. The provider must allow time to identify boards, coordinate isolations, inspect and test the agreed circuits, record results and assess observations properly.
Our guide explaining how long an EICR takes provides additional planning information.
Some interruption should usually be expected because certain inspection and testing procedures require safe isolation. The exact disruption depends on the design of the installation, the tests required and the equipment connected to each circuit.
Good planning can reduce the impact by testing one area or board at a time, agreeing short isolation windows and scheduling disruptive work before opening or after closing. Servers, refrigeration, security systems, lifts, machinery and other critical loads must be identified before testing begins.
A responsible provider should discuss isolation with the authorised site contact rather than switching unidentified circuits without a controlled plan.
The report must state the extent of the inspection and any limitations. The engineer must obtain sufficient inspection and test evidence to reach a competent conclusion about the installation within that agreed scope.
Representative sampling may be agreed where appropriate, particularly in larger installations, but it must be reasoned and recorded. Sampling should never become an excuse for a superficial inspection. Access restrictions, sensitive connected equipment and operational constraints must also be documented honestly.
Before accepting a quotation, ask what boards and circuits are included, what testing is proposed and how any limitations will appear on the final report.
The exact inspection depends on the property, but it commonly considers:
The purpose is to assess safety and suitability for continued use—not simply to judge whether the equipment looks modern.
Three-phase systems are common in premises with higher electrical demand or substantial plant and equipment. Examples include offices, restaurants, commercial kitchens, retail units, hotels, schools, warehouses, workshops, managed buildings and properties containing lifts, pumps, HVAC equipment or machinery.
The recommended inspection interval should be determined from the previous report, the installation, its use, maintenance history and the level of risk. A commercial property owner should not assume that every installation automatically has the same interval.
See our specialist guides for office EICRs and warehouse and workshop EICRs.
Common findings include incorrect circuit schedules, damaged accessories, signs of overheating, earthing or bonding deficiencies, unsuitable protective devices, poor insulation-resistance results and alterations that are not supported by clear certification.
Commercial installations often change as businesses expand, rooms are repurposed or new equipment is installed. If the electrical records are not updated, safe isolation and future maintenance become more difficult.
An unsatisfactory result does not automatically mean the entire property needs rewiring. The response should be based on the actual observations. Where repairs are required, see our failed-EICR remedial work service.
BS 7671:2018+A4:2026 has been published. The previous Brown Book incorporating Amendment 3 remains a valid standard only until 15 October 2026, so both editions can be encountered during the transition period.
Amendment 4 changes the presentation and effect of the FI classification. Under the new reporting form, C1 and C2 observations make the outcome unsatisfactory, while C3 and FI are advisory. During the transition, the report should make clear which valid edition and form have been used.
Read our guide to BS 7671 Amendment 4 and EICRs.
Provide the full address, building use, floor count, number of distribution boards and approximate circuits on each board. Include clear photographs of every board and schedule, a previous EICR if available, normal operating hours and details of any equipment that cannot be interrupted.
Also identify recent alterations, known faults, access restrictions, parking or permit requirements and whether out-of-hours testing is possible. Large or poorly documented installations may benefit from a short pre-inspection survey before the main work is scheduled.
Accurate information produces a more reliable quotation and reduces the risk of additional visits, failed access and unexpected disruption.
Send us your property address, distribution-board photographs, approximate circuit count and operating hours. We will assess the scope and provide a tailored inspection quotation based on the actual installation.
Find answers to common questions about EICR certificates and electrical safety inspections in London. Visit our FAQ page on EICRcertificates.com for more information.
