Some public-sector tenders ask for a bond and some don't — and the terminology (bid bond, tender bond, performance bond, surety bond) gets used loosely even in official documents. Here's what each one actually means, when you'll meet one, and what it costs.
A bid bond (also called a tender bond) is a guarantee from a surety company that you'll honour your bid if you win — sign the contract on the terms you tendered, at the price you quoted. If you win and then withdraw or refuse to proceed, the buyer can claim against the bond. It exists to stop firms submitting speculative low bids they never intend to honour.
A different guarantee, usually only relevant after you've won: it covers the buyer if you fail to complete the contract to the agreed standard. It's separate from a bid bond and normally only comes up once you're through to being the appointed contractor, not at bid stage.
Usually not. Bid bonds and performance bonds are typically asked for on larger or higher-risk public-sector and infrastructure contracts, not routine small-works or domestic-scale jobs. The only reliable way to know is to read the specific tender document — it will state plainly whether a bond is required and, if so, what percentage. Don't assume either way; don't buy anything speculatively before a live tender asks for it.
Bond values are commonly set at 1–10% of the contract value for bid bonds, and around 10% (sometimes 5–20% on higher-risk work) for performance bonds — but that's the guarantee amount, not what you pay. The premium you're actually charged is typically 1–3% of the contract amount for an established contractor with strong financials, though a smaller firm without a long track record may see quotes nearer 3–5%, and it's priced per-bond by the surety underwriter based on your financial strength and history.
From a surety bond broker or an insurance broker with a surety/bonds desk — not from your bank, and not something to arrange until a live tender specifically asks for it. Several UK brokers specialise in bonding small and mid-sized contractors specifically for public-sector tender work.
No. A surety bond is a three-party guarantee (you, the buyer, the surety) that you'll perform as promised — if you default, the surety can require you to repay what it pays out. It's closer to a form of credit than to insurance, which is why a surety underwriter looks hard at your financial position before quoting.
Next step: check whether today's live opportunities in your trade mention a bond requirement — construction & trades, cleaning, security — or join the waitlist to get matched contracts by email, bond requirements included where the notice states them.
Sources: published UK surety-bond broker guidance (CG Bonds, Nationwide Sureties, Gofeas, JW Surety Bonds), UK bid-writing/procurement guidance, as of July 2026. General information, not legal, financial or insurance advice — always confirm bond requirements against the actual tender document.
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