Lightning protection test and inspection reports explained
A lightning protection test and inspection report records the condition and continuity of a structure’s lightning protection system, assessed against BS EN IEC 62305 with BS 7430 behind the earthing. The standard is the same for every kind of building; the risk assessment decides the level of protection.
Last updated 15 October 2026. Written by the CertSync team and checked against the standards.
The short answer
A lightning protection test and inspection report records the condition and continuity of a structural lightning protection system: the air termination network, the down conductors, the bonding and the earth termination. It is assessed against BS EN IEC 62305, the four-part standard covering lightning protection, with BS 7430:2026 as the earthing code of practice behind the earth arrangement. Unlike most certificate types, the standard applies identically to domestic, commercial and industrial structures — the differentiation comes from the risk assessment and the resulting protection level, not from the building type.
Four parts, and what each one is for
BS EN IEC 62305 is published in four parts. In outline, Part 1 sets out the general principles; Part 2 covers risk management — the assessment that decides whether protection is needed and to what level; Part 3 deals with physical damage to the structure and the hazard to life within it; and Part 4 deals with the electrical and electronic systems inside the structure, which is where surge protection sits.
The series was redesignated at its third edition, and the current designation is BS EN IEC 62305. Older references without IEC name a different published document, so it is worth being precise about which one a report cites — particularly on work that may be reviewed by an insurer years later.
The risk assessment does the work sectors do elsewhere
For most certificate types the domestic/non-domestic split is the first question. Lightning protection does not work that way. BS EN IEC 62305 applies to structures generally, and the Part 2 risk assessment plus the resulting Lightning Protection Level — expressed as LPL I to IV — take the place of a sector field. A domestic structure with an exposed location and a commercial one with a sheltered location are differentiated by that assessment, not by a label.
That has a direct effect on the report. It should show the protection level the system was designed to, because every downstream judgement — what is inspected, how closely, and how often — follows from that level rather than from the kind of premises.
What the inspection and test actually covers
The inspection side is visual and physical: the air termination network and its fixings, the down conductors and their routes, test joints, bonding to metalwork and services, and the general condition of components exposed to weather since the last visit. Corrosion, mechanical damage and later building work that has disturbed a conductor route are the usual findings.
The test side centres on electrical continuity through the system and resistance readings at the earth termination, recorded per test point so that a change between visits is visible. A single reading in isolation says much less than a reading next to its predecessor, which is the main argument for keeping the reports together over the life of a structure.
Periodic inspection: the standard sets no interval
BS EN IEC 62305 does not set a fixed inspection interval. The usual UK routine is a full inspection and test every 12 months, whatever the protection level, as the practical way to meet the duty to maintain under the Electricity at Work Regulations 1989.
Inspect more often where the site is higher-risk, after a suspected strike, or where the insurer asks for it. CertSync pre-fills the next-due date 12 months ahead, and you can change it.
Frequently asked questions
- Which standard covers lightning protection in the UK?
- BS EN IEC 62305, published in four parts, with BS 7430:2026 as the earthing code of practice behind the earth termination arrangement.
- Does lightning protection certification differ for domestic buildings?
- No. BS EN IEC 62305 applies to structures generally. What differentiates one job from another is the Part 2 risk assessment and the resulting protection level, not whether the building is domestic, commercial or industrial.
- What is a Lightning Protection Level?
- It is the classification — LPL I to IV — that comes out of the risk assessment and sets how robust the protection system needs to be. Recording it on the report matters, because the protection the system was designed to deliver follows from it.
- How often should a lightning protection system be inspected?
- BS EN IEC 62305 sets no fixed interval. The usual UK routine is every 12 months, whatever the protection level, with more frequent inspection on higher-risk sites, after a suspected strike, or where the insurer requires it.
- What gets recorded on a lightning protection report?
- The visual condition of the air termination network, down conductors, test joints and bonding, plus continuity through the system and resistance readings at the earth termination, recorded per test point so changes between visits are visible.
- Is a lightning protection report the same as an EICR?
- No. An EICR reports on the condition of a fixed electrical installation under BS 7671. A lightning protection report covers a structural protection system under BS EN IEC 62305 — a different standard, a different system and a different inspection scope.
Disclaimer
This guide is general information, not professional advice, and does not replace professional judgement, training, scheme-body guidance or the current editions of BS EN IEC 62305 and BS 7430. CertSync does not verify the qualifications of the people using it. The contractor named on a certificate is responsible for what it certifies.
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