What the CIDB says about joint-venture grading
The CIDB publishes a joint venture grading designation calculator on its register site. According to the CIDB’s page, the calculator sums the capacity of all the joint venture partners to produce a grading for the joint venture.
Two further points from the same page are worth noting:
- Lead partner
- The lead partner must hold a registration not lower than one level below the advertised grade, in the relevant class of work. The CIDB’s example is that for an advertised 7GB, the lead partner must be registered at 6GB or higher.
- Deemed-to-satisfy combinations
- The page includes a table of partner combinations that are treated as meeting a grade, even if the summed capacity calculation falls short. The combinations vary by grade and by which partners hold the relevant class of work.
CIDB guidance generally expects each joint-venture partner to be registered in its own right. Confirm the current position in the CIDB’s guidance before you rely on it for a tender.
Practical points before tendering as a joint venture
- Read the tender notice to see whether joint ventures are allowed, how they must be documented and what evidence of each partner’s registration is required.
- Agree the lead partner early. It affects eligibility and which partner’s details appear first on the documents.
- Check each partner’s class of works, not only the grade.
- Agree who signs, who is responsible for what, and how profit, losses and liabilities are shared.
- Prepare the joint venture agreement and any documents the tender asks for at the time of tender, not after the award.
Insurance questions for joint ventures
A joint venture is a way of sharing a contract, and it also shares insurance questions that a single contractor does not face. These are issues to discuss with an insurer and your own legal adviser.
- Who is the insured?
- The policy may need to name the joint venture and each of its partners, so that each is covered for the project.
- Liability between partners
- Joint-venture partners may be jointly and severally liable under the contract or the agreement. Understand how that interacts with each partner’s own policies.
- Existing policies
- Each partner’s annual policies may not extend to the joint venture project. Check before assuming they do.
- Sums insured and limits
- Contract works and liability limits are set by reference to the whole project, not by a partner’s share.
- Who arranges what
- Agree in the joint venture agreement who places insurance and who bears the cost.
Guarantees for joint ventures
If the tender requires a bid bond or the contract requires a performance guarantee, the guarantee provider will normally assess each partner’s financial position, and may require security or indemnities from each of them. Joint ventures can involve more parties and more documents, so start early. A guarantee is never assured and is subject to the provider’s assessment.
Joint venture checklist
Before you submit a joint-venture tender
- The tender allows joint ventures and I have read the conditions.
- Each partner’s CIDB registration and class of works has been checked.
- The lead partner meets the CIDB’s lead-partner requirement for the advertised grade.
- I have used the CIDB’s joint venture calculator, and I have the output.
- The joint venture agreement is signed or ready to sign.
- I have a plan for the insurance the contract will require, and for any guarantee.
Common questions
Does a joint venture need its own CIDB registration?
CIDB guidance generally expects each partner to be registered in its own right, and the CIDB’s calculator then assesses the combination. Confirm the current position in the CIDB’s guidance and in the tender notice before you rely on it.
Can two smaller contractors always combine to tender for a larger contract?
No. Whether a combination qualifies depends on the CIDB’s joint venture calculator, its lead-partner requirement and its deemed-to-satisfy combinations, as well as the tender notice. Use the CIDB’s tool instead of a rule of thumb.
Who should be the lead partner?
The lead partner must meet the CIDB’s lead-partner requirement for the advertised grade and class. Beyond eligibility, it is sensible for it to be the partner best placed to manage the contract, and the joint venture agreement should say so.
How are guarantees and insurance handled for a joint venture?
Guarantee providers normally assess each partner, and insurers will want to know who is insured and how the partners’ liabilities relate. Agree who arranges each cover, and plan for both early. See the guarantees overview.
Tendering as a joint venture?
Share the tender requirements and the structure you are considering. We will review the insurance and security questions with you.
Get a QuoteAn enquiry does not put cover in place. Cover is subject to underwriting and policy terms.
Sources and further reading
- CIDB: Joint venture grading designation calculator (opens in a new tab) — the CIDB’s own tool and its notes on lead partners and deemed-to-satisfy combinations (checked 12 October 2026)
- CIDB: Construction Industry Development Board (opens in a new tab) — official site, with links to the Register of Contractors and the public contractor search (checked 12 October 2026)
- CIDB: Requirements for grading (opens in a new tab) — grading criteria and the grading designation table (checked 12 October 2026)
Related reading
- What is the CIDB? Grading, grades and grading tableWhat the CIDB is, what CIDB grades 1 to 9 mean, how a grading designation such as 6CE is written, and the CIDB grading table, with sources checked against the CIDB website.
- CIDB registration documents: preparing your informationA practical guide to preparing information for CIDB contractor registration or an upgrade: track record, financial statements and supporting documents, with sources.
- Bid bondsWhat bid security is, when tenders ask for it and what to check before you submit.
- Insurance after winning a tender: what to prepareWhat to do about insurance after a contract award: reading the contract’s insurance clauses, listing required covers and evidence, timing, and what to send your broker.