Should I sign a full and final settlement agreement?

Only once you know exactly what it covers, because a properly drafted settlement usually ends every claim inside its scope for good, including your right to take those claims to adjudication or court later. A full and final settlement agreement draws a line under the dispute: in exchange for an agreed figure you give up the claims it releases, permanently. Before signing, check three things. First, the scope: does it settle just this final account, or all claims arising from the project, including ones you do not even know about yet? The wider the wording, the more you are giving away. Second, the carve outs, the things you deliberately keep alive: retention still to be released, any outstanding VAT, interest, and liability for latent defects (defects that only surface later) should each be dealt with expressly, not left to silence, because anything the release covers is gone. Third, the arithmetic: work out the settlement against your own reconciled account, the figure you can actually prove, not the other side's assessment, so you know the true size of what you are conceding. Taking a discount in return for certainty and cash now is often a sensible deal; signing one under time pressure without reading the release clause is how good deals quietly turn into bad ones.

Say a demolition contractor is offered £150,000 to settle its final account, with a draft agreement to sign by the end of the week. The figure feels close enough, but before signing it reads the release clause and works through three things. On scope, the draft settles all claims arising from the project, not just this account, which would wipe out a separate £20,000 disruption claim it has not yet quantified, so it narrows the wording to this account only. On carve outs, the draft is silent on the £12,000 of retention still to fall due and on latent defects, so it adds express words keeping the retention payable and preserving each side's defects position. On the arithmetic, it settles against its own reconciled account of £175,000, not the payer's £150,000, so it knows it is giving up £25,000 for certainty and quick cash, which it decides is a fair trade. Read properly, it is a good deal; signed blind on the Friday, it would have surrendered the retention and the disruption claim as well.