TL;DR: Achilles accreditation is a supplier assurance scheme that verifies your health and safety, quality, environmental and financial standing before major buyers will add you to their approved supplier list or let you tender for work. Construction, infrastructure, transport and energy suppliers use Achilles BuildingConfidence, while utilities suppliers use the separate Achilles UVDB (Utilities Vendor Database) scheme. Membership is tiered: a lower tier covers SSIP compliance alone, while higher tiers add the Common Assessment Standard (CAS) and either a desktop or full on-site audit. Achilles does not publish a fixed price list — cost is bespoke, shaped by which scheme you need, the tier your client requires and your company’s turnover, so the right figure comes from a tailored quote rather than a headline price. Registration, questionnaire evidence and, for higher tiers, an audit, are all part of the route to qualification.
If a main contractor, utility company or public sector buyer has told you that you need to be “Achilles accredited” before they will work with you, you are not alone in finding the scheme confusing. Achilles runs several different products under one brand, the terminology has changed more than once in recent years, and pricing is rarely published anywhere obvious because it is quoted to suit each supplier. This guide sets out what Achilles accreditation actually involves, how pricing works in 2026, which level applies to your business, and how the application process works, based on what we see contractors and consultancies across Kent and the UK actually go through.
What Is Achilles Accreditation?
Achilles is a supplier qualification and pre-assessment scheme, founded in 1990, used by large buyers across construction, infrastructure, utilities, transport and energy to check that suppliers meet a recognised standard before they are allowed to tender or work on site. Rather than each buyer running its own supplier vetting from scratch, they rely on Achilles to have already verified your health and safety management, quality systems, environmental practices, financial stability, insurance and, increasingly, your data protection and modern slavery policies.
“Accreditation” is the term most people search for, but Achilles itself tends to describe the outcome as membership or qualification against a specific scheme. In practice it works the same way as SafeContractor or CHAS: you complete an assessment, evidence your policies and procedures, and once approved you appear on a buyer-facing database that your prospective clients can search before inviting you to bid.
BuildingConfidence vs UVDB: Which One Do You Need?
This is where most of the confusion starts, because Achilles runs two distinct schemes depending on your sector, and they are not interchangeable.
Achilles BuildingConfidence is aimed at construction, infrastructure, transport and energy suppliers. It incorporates Safety Schemes in Procurement (SSIP) compliance and, at higher tiers, the Common Assessment Standard (CAS), the same shared pre-qualification standard used by Constructionline and CHAS. If your work is on building sites, roads, rail or energy infrastructure projects, this is almost always the relevant scheme.
Achilles UVDB (Utilities Vendor Database), sometimes still called “UVDB Powered by Achilles,” is used by roughly 70 UK utility companies, including major names in electricity, gas and water, to qualify suppliers before they can bid for utilities contracts. UVDB assessment runs on its own set of verification categories rather than the BuildingConfidence tiers.
Check exactly which scheme your client or tender document names before you register. Applying to the wrong one is a common and avoidable way to waste both time and membership fees.
How Much Does Achilles Accreditation Cost in 2026?
Achilles does not publish a single, fixed price list the way some other schemes do. Pricing is bespoke — it depends on which scheme you need, the tier your client requires, and in some cases your company’s annual turnover — so the only reliable figure is one quoted against your specific circumstances. What you can map out in advance is which tier applies to you and what it covers:
| Tier type | What it covers |
|---|---|
| Entry-level (SSIP-only) | Core SSIP-recognised health and safety compliance, with no Common Assessment Standard requirement |
| Mid-tier (CAS, desktop audit) | Common Assessment Standard evidence review plus a remote desktop audit |
| Top-tier (CAS, on-site audit) | Full Common Assessment Standard assessment with a physical on-site audit |
Two things are worth flagging before you budget. First, Achilles scales some tiers to turnover, so a smaller business may sit in a different band to a larger supplier applying for the same tier. Second, membership renews annually rather than being a one-off cost, and reassessment happens at renewal, not just at first application. Because the figure is bespoke, it is always worth confirming your exact cost directly with Achilles, or with a consultant who has your specific scheme, tier and turnover to hand. If you would like a clear picture of what your accreditation would realistically involve, get in touch for a tailored quote and we can scope it with you.
What Do the Verification Levels Actually Mean?
The tier names matter less than what each level actually checks, because Achilles has adjusted its naming more than once. What stays consistent is the underlying structure: your evidence is reviewed either as a desktop exercise, where an assessor checks your documentation and questionnaire responses remotely, or with a site audit, where an assessor visits your premises or a live project to verify that what is documented matches what actually happens.
As a rule of thumb, lower tiers rely on documentation and self-declared evidence, while higher tiers, particularly anything including the Common Assessment Standard, add either a desktop audit or a full site visit. Buyers who work in higher-risk environments, or who are procuring higher-value contracts, tend to specify the audited tiers rather than accepting SSIP compliance alone. If your tender documentation simply says “Achilles” or “BuildingConfidence” without naming a tier, it is worth asking your client’s procurement contact exactly which level they expect, since paying for an audited tier you do not need is a common way businesses overspend on accreditation.
What Documents Do You Need to Apply?
Gathering your evidence before you start the online application saves weeks of back-and-forth with an assessor. You will typically need:
- A written health and safety policy, along with risk assessments and method statements specific to the work you actually carry out
- Evidence of competent health and safety advice, either in-house or from a retained health and safety advisor
- Employers’ and public liability insurance certificates
- Quality management evidence, including ISO 9001 certification if you hold it
- Environmental policy and, where relevant, ISO 14001 certification
- Financial information to demonstrate stability, particularly for higher tiers
- Training and competency records, plus modern slavery and data protection policies for the more detailed tiers
Businesses that already hold ISO 9001, ISO 14001 or ISO 45001 certification generally move through Achilles faster, because the underlying management system evidence overlaps significantly with what Achilles assesses. If you are weighing up whether to pursue ISO certification alongside Achilles, our guide to ISO 9001 vs 14001 vs 45001 explains where the standards overlap.
How to Apply for Achilles Accreditation: Step by Step
- Confirm exactly which scheme (BuildingConfidence or UVDB) and which tier your client or target buyer requires.
- Register with Achilles and select the correct service code for your sector.
- Gather the documentation and evidence listed above before you start the online questionnaire.
- Complete the questionnaire, matching every answer to a piece of uploaded evidence rather than a general statement.
- Submit for assessment. Lower tiers are reviewed as a desktop exercise, higher tiers add a further desktop or on-site audit.
- Respond promptly to any assessor queries. Delays at this stage are one of the most common reasons applications drag on.
- Once approved, you become visible to buyers searching the relevant Achilles database, and your membership renews annually with reassessment against the same standard.
The most common reason we see applications stall is generic health and safety documentation that was not written for the specific work being carried out. Assessors can tell quickly when a risk assessment or method statement has been copied from a template rather than reflecting your actual site operations, and it is the single biggest cause of delay in first-time applications.
How Does Achilles Compare to SafeContractor and CHAS?
Achilles, SafeContractor and CHAS are all recognised under the Safety Schemes in Procurement (SSIP) umbrella at their core SSIP-only tiers, meaning mutual recognition can, in principle, let one satisfy a client asking for another. In practice, which one you need comes down to your sector and who your clients are.
| Feature | Achilles | SafeContractor | CHAS |
|---|---|---|---|
| Strongest presence in | Construction, utilities, infrastructure, transport, energy | Facilities management, private sector | Public sector, local authority, housing |
| Sector-specific schemes | Yes (BuildingConfidence, UVDB) | No, single scheme | No, single scheme |
| SSIP member | Yes | Yes | Yes |
| Typical entry cost | Bespoke, quote-based | Quote-based | Quote-based |
If your work spans several sectors, it is common to end up holding more than one accreditation regardless of mutual recognition, simply because different buyers name different schemes in their tender documents. We cover the equivalent detail for the other major schemes in our guide to what SafeContractor accreditation involves, which is worth reading alongside this one if you are weighing up which schemes to hold.
Frequently Asked Questions
What is Achilles accreditation?
Achilles accreditation is a supplier qualification and pre-assessment scheme that verifies a business’s health and safety, quality, environmental, financial and compliance standing, so buyers in construction, utilities, infrastructure, transport and energy can confirm a supplier meets a recognised standard before allowing them to tender or work on site.
What is the difference between Achilles BuildingConfidence and UVDB?
BuildingConfidence serves construction, infrastructure, transport and energy suppliers and incorporates SSIP and the Common Assessment Standard. UVDB (Utilities Vendor Database) is a separate scheme used by around 70 UK utility companies to qualify suppliers for utilities contracts. They run on different assessment structures, so check which one your client actually requires.
How much does Achilles accreditation cost?
Achilles does not publish one fixed price — cost is bespoke. It depends on which scheme you need, the tier your client requires and, in part, your turnover, so the accurate figure comes from a quote against your specific circumstances rather than a headline price. The best way to budget is to confirm your exact cost with Achilles directly, or with a consultant who can scope your scheme, tier and turnover with you.
Do I need a site audit for Achilles accreditation?
Not always. Lower and mid-tier memberships are typically assessed on documentation and, in some cases, a remote desktop audit. A physical site audit is generally reserved for the top tier, most often required by buyers procuring higher-risk or higher-value work.
Is Achilles the same as SSIP?
No. SSIP (Safety Schemes in Procurement) is the umbrella body that allows schemes including Achilles, SafeContractor, CHAS and Constructionline to recognise each other’s core assessments. Achilles is one of several SSIP member schemes, not SSIP itself.
Do I need both Achilles and SafeContractor or CHAS?
Not necessarily, but it is common. SSIP mutual recognition can allow one accreditation to satisfy a client asking for another, but if your buyers work across different sectors and name different schemes in their tenders, you may need to hold more than one regardless of mutual recognition.
Get Expert Support With Your Achilles Accreditation
Working out which Achilles scheme, tier and level of evidence your business actually needs, rather than the one that looks safest to pay for, is where most of the wasted time and money happens. Our Achilles accreditation support service is delivered by a Chartered Member of IOSH (CMIOSH) and OSHCR-registered advisor, starting with a clear-eyed review of what your target buyers actually require and finishing with your evidence, questionnaire and, where needed, audit preparation handled from start to finish. Get in touch for a no-obligation conversation about what Achilles accreditation would realistically involve, and cost, for your business.