Picture two people instructing solicitors in the same month, for disputes of a similar size. A year later one considers the money well spent and the other feels fleeced, and the difference between them was fixed on day one, when only one of them received a proper letter about costs.
Most contentious work is billed by the hour, at rates that rise with the seniority of the person doing it and vary by region. Much routine work has moved to fixed fees: conveyancing is commonly quoted this way, as are wills and straightforward probate applications. Injury claims mostly run on conditional fee agreements, the no-win-no-fee model, where the firm is paid only on success and takes an agreed success fee, which for personal injury is capped as a share of your compensation. No-win-no-fee does not mean no-cost-ever; ask what you would owe if the claim fails, and whether insurance against that is part of the package.
A legal bill has two layers. The firm's own fees are one. The other is disbursements: money the firm pays out on your behalf to other people, such as court issue fees, property searches, expert reports and a barrister's fees for a hearing. These are passed on at cost, they are not optional, and on some matters they rival the legal fees themselves. An estimate that ignores them is not an estimate.
Back to the two clients. The first received a letter naming the person who would run the file and their hourly rate, describing the scope of work to a defined stage, estimating the fees to reach that stage, listing the likely disbursements with figures, promising a warning before any estimate was exceeded, and enclosing the complaints procedure. The second received a single line offering an estimate of costs plus VAT, with nothing about stages, extras or reviews. Solicitors are expected to give clients the best possible costs information at the outset, and firms must publish prices online for certain services, so a firm that goes quiet about money has made a choice. The letter is not a courtesy. It is the document you will both be held to.
An estimate is not a fixed quote, and honest matters do grow. The letter earns its keep in how growth is handled: ask for a costs update at each stage, ask to be told when the work approaches the estimate, and say at the start if there is a ceiling beyond which you want to stop and take stock. If the final bill still surprises you, ask for a breakdown. Concerns about service or billing go to the firm's own complaints process first and can then go to the Legal Ombudsman.
Among the 2,926 solicitors' firms listed on this site you will find every charging model in this piece. Compare firms near you, or describe your matter once and let several firms quote against each other. Then apply the only rule the two clients' stories support: no letter, no instruction. Wait for the costs letter before you commit to anyone.