The Electrical Installation Certificate (EIC) under BS 7671:2018+A4:2026 has new sections, new earthing-arrangement tick-boxes, an expanded Schedule of Inspections (items 1.0 through 14.0 including the new Prosumer LV installation item) and updated terminology. This guide walks every change visible on the canonical IET form.
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Written and reviewed by Andrew Moore, founder of Elec-Mate, against BS 7671:2018+A4:2026, IET Guidance Note 3 and the IET On-Site Guide.
The A4:2026 EIC adds item 14.0 "Prosumer's low voltage electrical installation(s)" to the Section H Schedule of Inspections (now 1.0 to 14.0), splits the TN-C-S earthing tick-box into PME and PNB, and keeps the three-signatory Design / Construction / Inspection & Testing structure. Item 6.0 now covers the new 30 mA RCD requirement for domestic luminaire final circuits (Regulation 411.3.4).
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An Electrical Installation Certificate (EIC) is issued for new electrical installation work, additions, and alterations to an existing installation. It is the design-construction-inspection record of work being put into service, and it must be issued under BS 7671 before the installation can be safely energised and used.
The EIC certifies new work or alterations meeting BS 7671. The EICR (Electrical Installation Condition Report) records the condition of an existing installation at a point in time. The EIC has design and construction signatures; the EICR has inspection and testing signatures only.
The original EIC is issued to the person ordering the work and a duplicate is retained by the person issuing the certificate (Regulation 644.4). The certificate is only valid once the Schedule of Inspections is completed and the relevant Schedule(s) of Circuit Details and Schedule(s) of Test Results are attached (Regulation 644.3).
Every key change in the 2026 amendment on one page. AFDDs, TN-C-S protection, new schedule columns, model forms. Pinned on your van dash.
A4:2026 retains the three-signatory structure that distinguishes EIC liability. Each role attests to compliance with BS 7671:2018 amended to the relevant date, subject to any documented departures (Regulations 120.3, 133.1.2, 133.1.3 and 133.5):
Section E records full name, address, postcode and telephone number for each signatory in Section C (Designer 1, Designer 2 where applicable, Constructor, Inspector). This makes the chain of responsibility for the installation explicit — critical for warranty, insurance and future investigation.
Section F of the A4:2026 EIC has the same earthing-arrangement tick-box list as the EICR:
Other supply parameters in this section: Number and type of live conductors (AC: 1-, 2-, 3-phase 3-wire or 4-wire, with confirmation of polarity; DC: 2-wire or 3-wire), nominal voltage U/U₀, frequency, prospective fault current Ipf, external earth fault loop impedance Ze, and the supply protective device characteristics (BS EN, type, rated current, breaking capacity).
Section G consolidates the installation's headline characteristics in one block:
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The A4:2026 EIC Schedule of Inspections in Section H lists 14 inspection items, each requiring an "Outcome (✓ / N/A)" entry:
On the EIC each Schedule of Inspections item takes a simple Outcome entry — a tick to confirm the item is satisfactory, or N/A where it does not apply. This is initial verification of new work, so there are no observation classification codes. The C1 / C2 / C3 / FI condition codes belong to the EICR, which assesses an existing installation. See the A4:2026 Schedule of Tests changes for the measurement columns that accompany this inspection.
Item 14.0 is the most distinctive new inspection point on the A4:2026 EIC. A4:2026 introduces an entirely new Chapter 82 covering Prosumer's Electrical Installations (PEIs) — low voltage installations that both consume energy from the supply AND produce or store energy that may be exported. BS 7671 defines a prosumer as an entity that can be both a producer and a consumer of electrical energy, combining functions traditionally separated into "consumer" and "generator" installations.
Prosumer installations have bidirectional power flow, anti-islanding protection requirements (G98/G99 compliance for grid connection), specific earthing considerations, additional disconnection and isolation requirements, and labelling needs that distinguish "switched off" from "isolated from generation". A dedicated inspection item makes these checks visible and traceable on every EIC.
Section D of the EIC records the designer's recommended periodic inspection interval — the time after which the responsible person should commission the next EICR. The interval is expressed in years or months and is influenced by:
Domestic owner-occupied: 10 years. Domestic rented: 5 years (statutory under PRS Regs 2020 in England). Commercial: 5 years. Hospitals: 1 year. Caravan parks / marinas: 1 year. Agricultural / horticultural: 3 years (1 year if particularly harsh).
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