“My employer says I need EN ISO 20345 boots” is one of the most common searches from new tradesworkers before their first day on an Irish site. EN ISO 20345 is the European safety standard for protective footwear, and understanding what it actually covers makes it far easier to buy the right boot the first time, rather than guessing.

What EN ISO 20345 Actually Certifies

At its baseline, the standard requires toe protection that can withstand a defined impact and compression force, along with slip-resistant soles and antistatic properties. Every certified boot has passed independent testing against these thresholds before it can carry the certification mark.

The Safety Classes Explained

Certification is graded into classes, each adding requirements on top of the last:

• SB: toe protection only, the baseline level
• S1: SB plus antistatic properties, heel energy absorption and a closed heel area
• S1P: S1 plus a penetration-resistant midsole
• S2: S1 plus water penetration and absorption resistance
• S3: S2 plus a penetration-resistant midsole and a cleated outsole
• S5: the same protections as S3, built into a full boot rather than a low shoe
• S7: S5 plus a fully waterproof leather upper for prolonged wet exposure

Most Irish construction roles are specified at S1P or S3, with S5 and S7 reserved for groundworks, farm work or roles with prolonged water exposure.

Toe Protection Within the Standard

Steel and composite toe caps are tested against the exact same impact and compression thresholds under EN ISO 20345: certification doesn’t favour one material over the other. The choice between them comes down to weight, temperature comfort and whether the role involves metal detectors, not safety level.

Why Certification Matters Beyond Compliance

Certification isn’t just a box to tick for a site induction. The National Standards Authority of Ireland oversees how these standards are applied nationally, and genuinely certified footwear is one of the most effective, low-cost ways to prevent the foot and ankle injuries that make up a large share of site incidents each year.

Wearing uncertified footwear on a site that requires EN ISO 20345 boots can also affect insurance cover and site access, since most main contractors check for the certification mark as part of a standard induction, not just as a formality.

Certification vs General Marketing Claims

Terms like “heavy duty,” “industrial grade” or “work boot” carry no certification meaning on their own: they’re marketing language, not a tested standard. Only a specific class code (SB, S1, S1P, S3, S5 or S7) alongside a CE mark confirms a boot has actually passed EN ISO 20345 testing.

If a listing describes a boot as suitable for construction but doesn’t name a class, it’s worth treating that as a gap to ask about rather than assuming the strongest possible protection.

How to Check a Boot Is Genuinely Certified

A certified boot carries a CE mark along with the specific class code (S1P, S3, and so on) printed on the tongue or inside the boot. That same class code should match exactly what’s stated on the product page: if a listing only says “safety certified” without naming a class, it’s worth asking the retailer to confirm before buying.

EN ISO 20345 vs Other Safety Footwear Standards

EN ISO 20345 is the standard used across the EU and Ireland, but it’s not the only one in circulation. Boots imported from outside Europe are sometimes tested to different national standards, such as ASTM in the US, which use different testing methods and aren’t automatically equivalent. A boot certified under a non-EU standard shouldn’t be assumed to meet Irish site requirements without checking.

What to Buy Once You Know Your Class

Once you know the class your role requires, choosing a boot becomes far simpler. Most general site roles are covered by S1P or S3 boots, while roles involving standing water or wet ground are better matched to a dedicated waterproof S3 or S7 boot.

Frequently Asked Questions

What does EN ISO 20345 mean for safety boots?

It’s the European certification standard for protective footwear, testing toe protection, slip resistance and other safety features before a boot can be sold as certified.

What is the difference between S1, S1P, S3 and S5 boots?

Each class builds on the last: S1 adds antistatic and heel protection, S1P adds midsole penetration resistance, S3 adds a cleated sole, and S5 applies the same protections to a full boot, normally safety wellingtons.

Do steel toe and composite toe boots both meet EN ISO 20345?

Yes. Both materials are tested against the same impact and compression thresholds, so certification level doesn’t depend on which one you choose.

How do I check if a boot is genuinely EN ISO 20345 certified?

Look for a CE mark and a specific class code such as S1P or S3 printed on the boot, and make sure it matches the certification stated on the product page.

What safety class do I need for general construction work?

Most general construction roles are specified at S1P or S3, though your employer or site induction should confirm the exact class required for your role.