CHAS vs SafeContractor vs SMAS UK 2026: which SSIP scheme should you choose?

Every UK construction subcontractor eventually faces the question: which Safety Schemes in Procurement (SSIP) accreditation should we get? CHAS is the biggest. SafeContractor markets aggressively. SMAS Worksafe charges less. The marketing material from each makes them sound essential - and the reality is most main contractors accept any of them, so the right choice depends on cost, audience, and ongoing admin burden. This guide compares all three honestly with current 2026 prices and the actual differences that matter.

What SSIP actually is

SSIP stands for Safety Schemes in Procurement. It is a framework that allows multiple competing accreditation schemes to be mutually recognised, so a contractor that has CHAS does not also need to get SafeContractor (the same paperwork has been verified). SSIP is not itself an accreditation - it is the umbrella that recognises around 25 different schemes including the big three.

The point of SSIP is to reduce duplicate paperwork. A subcontractor who has any one SSIP-recognised scheme should be accepted by any client that requires SSIP. In practice, some clients still demand specific schemes (usually CHAS) regardless of SSIP recognition, but the principle of mutual recognition is well established now.

CHAS

What CHAS is

CHAS (the Contractors Health and Safety Assessment Scheme) is the oldest and largest UK SSIP scheme. It was originally founded by London Boroughs in 1997 and is now owned by the supplier-management software company Veriforce. CHAS verifies a contractor's health and safety competence through a desktop assessment of submitted documentation.

What CHAS verifies

CHAS reviews health and safety policy, risk assessment processes, accident records, training procedures, insurance certificates, and basic operational documentation. The assessment is fundamentally a paperwork exercise - the assessor never visits site or audits operational practice. The result is a digital certificate that can be shared with clients.

CHAS pricing in 2026

CHAS pricing depends on company size and scheme tier:

CHAS Standard: from GBP 425 + VAT per year for sole traders / micro businesses, scaling up to GBP 1,500+ per year for medium businesses (50+ employees)
CHAS Premium: adds environmental and quality management assessment, typically GBP 700-1,800 per year
CHAS Elite: highest tier with additional verifications, typically GBP 1,200-2,500 per year

Note that CHAS pricing has increased significantly in recent years - small contractors who renewed at GBP 250 a few years ago now face GBP 425+ renewals.

Where CHAS is required

CHAS is the most commonly named scheme in UK construction tenders, particularly for local authority work, large commercial developments, and Tier 1 main contractors. If you bid for council, NHS, or major commercial work, CHAS is the safest bet because it is the scheme buyers most often specify by name.

SafeContractor

What SafeContractor is

SafeContractor is the second largest UK SSIP scheme, owned by Alcumus (which also owns Constructionline). It launched in 2003 and has grown rapidly through aggressive sales and marketing. The desktop assessment is similar in scope to CHAS but the customer experience tends to be more sales-led.

What SafeContractor verifies

Like CHAS, SafeContractor reviews health and safety policy, processes, training, insurance and basic operational documentation through desktop review. The technical content is broadly equivalent to CHAS - this is part of why SSIP recognition works. There are minor differences in how each scheme assesses certain areas (e.g. SafeContractor places more weight on environmental management), but the core verification is the same.

SafeContractor pricing in 2026

SafeContractor pricing typically runs:

SafeContractor accreditation: from GBP 425 + VAT per year for small contractors, scaling to GBP 1,500+ for larger businesses
Bundled Alcumus packages: SafeContractor + Constructionline + other Alcumus services often sold as a bundle, typically GBP 1,200-2,500 per year depending on tier

SafeContractor pricing is broadly comparable to CHAS for the equivalent tier. Where SafeContractor differs is in the bundling - if you also need Constructionline, the bundled deal can work out cheaper than buying both separately.

Where SafeContractor is required

SafeContractor is widely accepted in private sector commercial work, facilities management, and large UK retailers. Some public sector clients prefer CHAS but most accept SafeContractor under SSIP. SafeContractor is particularly common with FM services, mechanical and electrical contractors, and specialist trades working in occupied premises.

SMAS Worksafe

What SMAS Worksafe is

SMAS Worksafe (Safety Management Advisory Services) is the third major UK SSIP scheme. It is run as a subscription service rather than a one-off accreditation, and is generally considered the most cost-effective of the big three for small and medium contractors. SMAS includes ongoing support and is positioned as a more affordable, more service-oriented alternative.

What SMAS verifies

SMAS verifies the same fundamental areas as CHAS and SafeContractor: health and safety policy, risk assessment, training, insurance, and operational documentation. The assessment is desktop-based. SMAS includes phone and email advisory support during the year, which the others charge separately for.

SMAS pricing in 2026

SMAS pricing in 2026 typically:

SMAS Worksafe: from GBP 195 + VAT per year for sole traders, scaling to around GBP 800-1,200 for larger businesses

SMAS is consistently the cheapest of the big three at every company size. The price gap is biggest for smaller contractors - a sole trader can save GBP 200+ per year choosing SMAS over CHAS.

Where SMAS is required

SMAS is increasingly accepted by major contractors but is still less commonly named in tenders than CHAS or SafeContractor. Where buyers ask for "SSIP accredited", SMAS works. Where buyers specifically name a scheme, SMAS is occasionally rejected even though it shouldn't be.

Side-by-side comparison

Aspect	CHAS	SafeContractor	SMAS Worksafe
Owner	Veriforce	Alcumus	SMAS Ltd
Year founded	1997	2003	2008
Smallest annual cost	GBP 425+	GBP 425+	GBP 195+
Typical mid-business cost	GBP 700-1,500	GBP 700-1,500	GBP 400-800
SSIP recognised	Yes	Yes	Yes
Most named in UK tenders	Yes (most common)	Common	Less common
Public sector acceptance	Universal	High	Mixed
Ongoing support included	No (paid)	Limited	Yes
Bundle options	Limited	Yes (with Constructionline)	No

How to choose

If you bid for council or NHS work, choose CHAS

Public sector tendering documents most often name CHAS specifically. Even where SSIP is the formal requirement, scoring criteria sometimes favour CHAS-accredited bidders over equivalent-but-different SSIP holders. For UK public sector work, CHAS is the safest bet.

If you mainly work for FM, retail or commercial clients, SafeContractor or CHAS

Private sector clients typically accept either. SafeContractor's bundling with Constructionline can be cost-effective if you also need Constructionline. Otherwise CHAS and SafeContractor are functionally interchangeable for private sector commercial work.

If you are a small business or sole trader on tight margins, SMAS

SMAS at GBP 195 versus CHAS at GBP 425 is a meaningful difference for a sole trader. As long as your buyer accepts SSIP rather than naming CHAS specifically, SMAS gets you the same SSIP recognition at less than half the cost. The included advisory support is genuinely useful for smaller businesses without dedicated H&S staff.

If you bid for a mix of public and private work, CHAS or two schemes

Bigger contractors often hold two schemes (CHAS plus SafeContractor or CHAS plus SMAS) to cover all client requirements. The total annual cost is GBP 800-2,500 but it removes friction at tender stage.

Common mistakes

Paying for multiple schemes when one would do

SSIP recognition means having one accepted scheme is usually enough. Many small contractors pay GBP 1,000+ for both CHAS and SafeContractor when their client base would happily accept either. Audit your actual client requirements before renewing both.

Choosing the cheapest without checking client requirements

SMAS being GBP 200 cheaper is irrelevant if your biggest client specifies CHAS. Check your top 5 clients' procurement requirements before choosing.

Treating accreditation as a one-time event

All three schemes are annual subscriptions. Lapsing accreditation while bidding for work is one of the most common reasons for late tender disqualification.

Submitting weak documentation

The desktop assessment is only as good as what you submit. Generic policy templates downloaded from the internet often fail. Project-specific RAMS, real accident records, and current training matrices are what get assessments approved first time.

Beyond the big three: Constructionline, Achilles, BuildUK

Other major UK accreditations include:

Constructionline: not a safety scheme but the largest UK procurement and prequalification database. Often required alongside SSIP. Owned by Alcumus (same as SafeContractor).
Achilles: sector-specific qualification platform, common in utilities and rail.
BuildUK Common Assessment Standard: simplified standard adopted by major contractors as an alternative to SSIP for smaller subcontractors.
Avetta: US-origin SSIP-recognised scheme used by some multinational clients.
Acclaim Accreditation: SSIP-recognised, less common than the big three.

The number of competing schemes is part of why UK construction has SSIP - to allow mutual recognition without locking contractors into multiple paid memberships.

Tracking it all

Whichever scheme you choose, the operational challenge is keeping the certificate current, having it accessible when a contractor asks, and reminding yourself before it expires. Complys tracks every UK accreditation (CHAS, SafeContractor, SMAS, Constructionline, Achilles, NICEIC, NAPIT, ECS, CISRS, NFRC, Gas Safe, and dozens more) with automatic expiry alerts and one-click sharing with main contractors.

Most contractors who lose work do so because their accreditation lapsed without anyone noticing - not because they failed to renew, but because the renewal date slipped past. Calendar reminders work for one or two certificates; for 10+ accreditations across a growing team, software is more reliable. Start the free trial.

FAQ

Can I switch from one scheme to another?

Yes, with no penalty. You simply do not renew the old scheme and apply to the new one. There is no exit fee.

Do I need to keep the old scheme during the transition?

Recommended yes - keep the old certificate live until the new one is issued, especially if any active tenders specify the old scheme.

Are SSIP schemes worth it for sole traders?

Depends on your work. If your customers are domestic, no - SSIP adds cost without benefit. If you bid for any commercial or public sector work, yes - it is usually a hard tender requirement.

Can I claim back the cost as a business expense?

Yes - SSIP scheme fees are fully tax-deductible as a business expense.

How long does accreditation take?

From submission to certificate, typically 4-8 weeks depending on the scheme and your responsiveness to assessor questions. Plan well ahead of any tender deadline.