Guide · Accreditation & compliance
CHAS, Constructionline, SafeContractor or SMAS: which accreditation does your tender actually need?
Published 14 July 2026 · Sources linked throughout · This is a plain-English guide to published industry information, not legal or procurement advice.
1The short answer
You almost certainly don't need all of them. CHAS, Constructionline, SafeContractor, SMAS and several others are all SSIP member schemes — independent assessment bodies that certify the same underlying health-and-safety competence, under an umbrella standard set by Safety Schemes in Procurement (SSIP). Because of SSIP's "Deem to Satisfy" mutual recognition agreement, a valid, in-date certificate from any SSIP member scheme is meant to be accepted by buyers who ask for SSIP accreditation generally, without redoing the assessment elsewhere. Pick one, keep it current, and you're covered for SSIP purposes across most public-sector buyers.
2So why do buyers keep naming specific schemes?
Two reasons, and both matter for how you bid. First, some buyers and principal contractors have a house preference — often Constructionline, because it's tightly integrated with the Common Assessment Standard used across construction procurement, or CHAS, because it's one of the longest-established schemes with broad public-sector recognition. Second, a growing share of buyers ask for accreditation to the Common Assessment Standard (CAS) specifically, not just "an SSIP scheme" — and CAS is a separate, broader pre-qualification standard that CHAS and Constructionline can both assess you against (see our PAS 91 → CAS guide for the full picture). Read the actual SQ/ITT wording: "SSIP accreditation" and "Common Assessment Standard verification" are not the same ask.
3The four names, compared
| Scheme | Where it's strongest | Worth knowing |
|---|---|---|
| CHAS | Long-established; broad public-sector recognition across local authorities and housing | Tiered levels (Standard, Advanced, Elite); can also certify to CAS |
| Constructionline | Construction and works contracts; house preference for many principal contractors | Gold/Silver/Platinum tiers — Gold is increasingly the de facto minimum for main-contractor supply chains; Gold verifies against CAS |
| SafeContractor | Facilities management, building maintenance and cleaning contracts | Known for a streamlined assessment process |
| SMAS Worksafe | Scotland and the north of England | Regionally strong; same SSIP mutual recognition applies |
Scheme positioning summarised from public scheme and industry-guide descriptions — always confirm current tiers, scope and pricing on the scheme's own site before applying, as these details change.
4A practical decision
| If you mostly bid for… | Reasonable starting point |
|---|---|
| Local authority / housing association trade contracts generally | CHAS — broadest general public-sector recognition |
| Construction or works, especially as a subcontractor to a principal contractor | Constructionline Gold — increasingly what supply chains filter on, and verifies you against CAS in one step |
| FM, cleaning or building-maintenance contracts | SafeContractor — sector-recognised, often the named scheme in FM ITTs |
| Work concentrated in Scotland or the north | SMAS Worksafe — strong regional recognition |
| You already hold one and a new ITT names a different scheme | Check the SSIP portal / Deem to Satisfy first — you may not need to reapply at all |
5What our own data found
We analysed 882 live UK public-sector tender notices (Contracts Finder and Find a Tender, May–July 2026) at the metadata level. Not one of CHAS, Constructionline, SafeContractor, SSIP, ISO 9001, ISO 14001 or ISO 45001 appeared in the notice text or title. These requirements exist, but they live inside the attached SQ/ITT documents, not the public notice. In practice this means you cannot tell which accreditation a contract actually needs until you open the documents — a search engine or alert feed will never surface it. That's precisely the gap BidCrier Studio's document analysis is built to close: every mandatory accreditation requirement, extracted from the actual tender pack and checked against what you hold.
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Sources: SSIP, "What is SSIP?"; SSIP, "Deem to Satisfy to Mutual Recognition"; Constructionline, sub-contractor membership levels; CHAS, "PAS 91 vs SSIP vs CAS". Notice-level statistics are BidCrier Studio's own analysis of 882 public UK tender notices, methodology in docs/research/tender-landscape.md. This guide is general information, not legal or procurement advice — always check the specific SQ/ITT wording of your own tender, and verify current scheme tiers, scope and cost directly with the scheme before applying.