When Do I Need An Electrical Installation Certificate (EIC)?
If you've just had electrical work done, or you're about to, you've probably asked yourself: when do I need an electrical installation certificate? It's a fair question, and the answer matters more than most people realise. An Electrical Installation Certificate (EIC) is a legal document that confirms new electrical work meets the requirements of BS 7671 (the IEE Wiring Regulations). Without one, you could face problems with building control, insurance claims, or future property sales.
The scenarios that trigger the need for an EIC are specific. Whether it's a new circuit installation, a full rewire, a consumer unit replacement, or work carried out as part of a renovation, the electrician completing the job is legally required to issue one. For landlords, the certificate also plays a role in demonstrating compliance alongside your EICR. Missing or incomplete certification can create real headaches down the line, particularly when selling a property or responding to a local authority inspection.
At Electrical Testing London, we carry out electrical installations and testing across London, Greater London, and the South East, and we deal with EIC-related questions daily. This article breaks down exactly when an EIC is required, who's responsible for issuing one, how it differs from other electrical certificates, and what to do if yours is missing. Everything here reflects current UK regulations so you can make informed decisions about your property.
What an EIC is and what it covers
An Electrical Installation Certificate is a formal document that a qualified electrician must produce whenever they carry out notifiable electrical work in a property. Its legal basis comes from Part P of the Building Regulations 2010, which covers electrical safety in dwellings in England and Wales. In Scotland and Northern Ireland, equivalent regulations apply under their own separate building standards frameworks. The EIC confirms that the work has been designed, installed, inspected, and tested in accordance with BS 7671, the national wiring standard that governs electrical installations throughout the UK.
An EIC is not optional. If notifiable work has been completed without one, that installation has not been properly signed off under building regulations, and that gap creates real problems for you as a property owner.
The certificate itself is not a single-page form. It comes with a Schedule of Inspections and a Schedule of Test Results, both of which form part of the complete document package. The Schedule of Inspections records a checklist of everything the electrician verified visually during the installation process. The Schedule of Test Results records the actual measurements taken during testing, such as insulation resistance values, earth fault loop impedance, and prospective fault current. Together, these documents give a complete technical picture of the installation's condition at the point of completion.
The three signatories on an EIC
One of the most important features of an EIC is that it requires up to three separate signatures. These represent the designer, the installer, and the inspector or tester. In practice, all three roles are often carried out by the same qualified electrician, but the certificate still requires each role to be declared and signed off individually. This separation of duties is intentional, because it creates a structured check on the quality of the work at every stage, from the initial design through to final testing and verification.
Each signatory takes direct responsibility for their specific part of the process. The designer confirms the circuit design meets BS 7671 requirements. The installer confirms the work was carried out according to that design. The inspector and tester confirms the finished installation has been checked and measured to the required standard. If you are ever asked when do I need an electrical installation certificate, part of the answer lies in understanding that whoever carries out the work must be competent to fulfil all three of these declared roles, or must involve someone who is.
What information the certificate records
The EIC captures specific technical details about the installation itself, not just a general declaration of approval. It records the address of the property, a description of the work carried out, the method used to protect against electric shock, and the earthing and bonding arrangements in place. This level of detail matters because it gives future electricians, surveyors, and building control officers a clear reference point for the state of the installation at the moment it was completed.
Your EIC also records the maximum demand of the installation, the supply characteristics including voltage and frequency, and the type of earthing system used. These details are essential for any future electrical work, because any electrician taking on subsequent jobs needs to understand what they are working with before they start. Keeping your certificate safe and accessible is therefore important not just for meeting compliance requirements now, but for the long-term safety and proper maintenance of your property's entire electrical system.
When you need an EIC under UK rules
The question of when do I need an electrical installation certificate comes down to one key concept: notifiable work. Under Part P of the Building Regulations, any new circuit installation in a dwelling triggers the requirement for an EIC. This covers full rewires, consumer unit replacements, and adding circuits to supply additional power outlets, lighting, or fixed appliances. If a qualified electrician carries out any of these jobs, they must issue an EIC upon completion, and the work must be notified to building control.
New circuits and consumer unit replacements
Installing a new circuit is the most common trigger for an EIC, regardless of the circuit's purpose. Common examples include:
- A new ring main
- A dedicated circuit for an electric cooker
- A circuit for an EV charger
- Additional lighting circuits added during a renovation
Consumer unit replacements also require an EIC because replacing the unit involves working on the main incoming supply arrangement, which building control treats as a full installation rather than a minor repair.
If your electrician completes a consumer unit replacement and does not provide an EIC, ask for one immediately. Work without certification creates real problems when you come to sell the property.
Work in special locations
Special locations carry an additional layer of regulation under BS 7671, and any electrical work carried out in them is automatically notifiable. Kitchens and bathrooms fall into this category because water and electricity in close proximity create a heightened risk of electric shock. Work in garden buildings, swimming pools, and outdoor areas also qualifies.
Adding a socket in a bathroom or installing a new lighting circuit in a kitchen both trigger the EIC requirement even if the existing circuit is already in place. Any alteration or addition to wiring within a special location counts as notifiable work, so confirm with your electrician whether your planned job requires certification before the work begins.
When you sell or remortgage a property
Buyers and mortgage lenders routinely ask for certificates covering electrical work carried out since the property was built or last rewired. Without an EIC for work that required one, you may need to commission a retrospective inspection, which adds cost and delay to the transaction.
Having your EIC filed and accessible removes that risk entirely. Conveyancers regularly flag missing electrical certificates as a legal issue during the exchange process, and some lenders will decline to proceed until the certification gap is resolved.
EIC vs EICR vs minor works certificates
Knowing when do I need an electrical installation certificate becomes clearer once you understand how an EIC fits alongside the other two certificates you'll encounter most often. Each document covers a different scenario, and mixing them up leads to real gaps in your compliance records.
What an EICR covers
An Electrical Installation Condition Report (EICR) is not a completion certificate. It is a periodic inspection report that a qualified electrician produces to assess the condition of an existing electrical installation. An EICR doesn't confirm that new work was carried out correctly; it tells you whether the current state of the wiring, earthing, and protective devices meets the standard required for continued safe use.
Landlords in England need a valid EICR every five years, or at the start of each new tenancy, under the Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020. An EIC does not replace this requirement.
Homeowners and commercial property managers use EICRs to identify deterioration, damage, or non-compliance in installations that may be decades old. The report grades every fault it finds using a coded classification system (C1 for danger present, C2 for potentially dangerous, C3 for improvement recommended), giving you a clear priority list for any remedial work that follows.
When a minor works certificate applies instead
A Minor Works Certificate covers small, non-notifiable additions or alterations to an existing circuit. If your electrician adds a single socket outlet to an existing ring main or replaces a damaged switch, neither of those jobs triggers the notifiable work threshold under Part P. In that case, a minor works certificate is the appropriate document, not a full EIC.
The distinction matters because issuing a full EIC for minor work is unnecessary, and issuing only a minor works certificate for notifiable work leaves you without proper building control sign-off. Your electrician should confirm which applies before starting. A straightforward way to check is to ask whether the job involves creating a new circuit or working within a special location, because either of those conditions pushes the work firmly into EIC territory.
| Certificate | Trigger | Who issues it |
|---|---|---|
| EIC | New circuit or notifiable work | Qualified electrician or registered contractor |
| EICR | Periodic inspection of existing installation | Qualified electrician |
| Minor Works Certificate | Small alteration to existing circuit | Qualified electrician |
How to get an EIC and Part P sign-off
Getting an EIC starts with hiring a qualified electrician who is registered with a government-approved competent person scheme. In England and Wales, Part P of the Building Regulations requires that anyone carrying out notifiable electrical work either holds registration with an approved scheme such as NICEIC or NAPIT, or notifies the local authority building control department before the work begins. Registration is by far the most common route because it removes the administrative burden of dealing with building control and keeps the process simple for you.
Once a registered electrician completes the work and issues your EIC, they notify building control on your behalf, so you receive the certificate without needing to take any additional steps.
Use a registered competent person scheme
Registered competent person schemes operate under government authorisation and allow member electricians to self-certify their work. When you hire an electrician who belongs to one of these schemes, they carry out the installation, conduct the inspection and testing, issue your EIC, and notify building control that the work is complete. You then receive a certificate of building regulations compliance confirming the job has been properly signed off.
Verifying scheme membership takes only a few minutes using the relevant scheme's online register, and it is worth doing before any work begins. This step matters most when the question of when do I need an electrical installation certificate is tied to a deadline, such as a property sale, where missing or invalid certification causes immediate problems with conveyancers and mortgage lenders.
What happens if you use a non-registered electrician
If your electrician is not registered with a competent person scheme, they cannot self-certify the work. Instead, you must notify your local authority building control department before the work begins, and a building control officer will inspect the completed installation. If it meets the required standard, they issue a completion certificate. This route adds both cost and time to the process, and the inspection fee falls on you rather than the electrician.
Some non-registered electricians are fully qualified and technically competent, but the absence of scheme registration makes the certification process more involved for everyone. Wherever possible, confirm scheme membership before agreeing to any notifiable electrical work on your property.
What to do if you cannot find your EIC
Losing or misplacing your EIC is more common than you might expect, particularly in older properties that have changed hands several times. If you're in the middle of a property sale or you've just received a request from a building control officer or conveyancer, the first step is to stay calm and work through a logical process rather than immediately assuming the worst. Missing certification does not automatically mean the work was unsafe, but it does mean you need to address the gap before it causes delays to your transaction or compliance checks.
Contact the electrician or contractor who carried out the work
Your first action should be to contact the electrician or company that originally completed the installation. Registered contractors are required to keep records of the work they certify, and many hold copies of EICs for a number of years after completion. If you know roughly when the work was done and who carried it out, this step often resolves the problem quickly. Ask for a duplicate copy of the original certificate in writing.
If the contractor has since closed or you cannot identify who did the work, contact the competent person scheme the electrician was registered with at the time. Schemes such as NICEIC and NAPIT hold records of registered members and, in some cases, can help you trace certified work tied to a specific address. This route is worth exploring before commissioning a full reinspection.
Arrange a further inspection if no record exists
When the question of when do I need an electrical installation certificate arises because a certificate is missing for work that required one, a further inspection is usually the most practical solution. A qualified electrician can inspect the installation and, if the work meets the current standard, produce documentation that reflects its condition. This will not recreate the original EIC, but it gives you a formal record you can present to building control, conveyancers, or lenders.
In some cases, particularly where the installation is older or shows signs of degradation, the inspector may recommend remedial work before any new documentation can be issued.
The cost of a further inspection is almost always lower than the delays caused by proceeding without certification during a property transaction. Sorting this out early, rather than at the point of exchange, keeps the process moving and protects your position as a seller or landlord.
Next steps
Understanding when do I need an electrical installation certificate puts you in a much stronger position, whether you're planning new electrical work, managing a rental property, or preparing for a sale. The key points to carry forward are straightforward: any new circuit or notifiable work requires an EIC, the electrician completing the job is responsible for issuing it, and missing certification needs to be addressed before it causes delays or compliance failures.
Your next practical step depends on where you currently stand. If you have upcoming electrical work on your property in London or the South East, make sure the contractor you hire is registered with an approved competent person scheme. If you're unsure about existing certification or need a qualified team to carry out installation work properly, request a quote from Electrical Testing London and we'll confirm exactly what you need before any work begins.
