Retention in Construction, Explained: How to Protect Your Cash

What retention is

Retention is a portion of each payment that a customer holds back from a contractor (or a contractor holds back from a subcontractor) as security. The idea is simple: it gives the paying party something to fall back on if defects appear and aren't put right. Once the work has proven itself over time, the retained money is released.

It's a normal, long-standing part of construction contracts — and also one of the biggest silent drains on contractor cash flow, because retention money is easy to lose track of and, too often, never chased.

How much is held, and when it's released

Retention is usually a percentage of the value of each payment — commonly around 3% to 5%, though it varies by contract. It's typically released in two stages:

Half at practical completion — when the works are finished and usable, the first slice of retention is released.

The remaining half at the end of the defects liability period — a defined window (often 6 or 12 months) after completion, during which the contractor fixes any defects that emerge. Once it ends and outstanding issues are resolved, the balance is due.

So on a project finished in spring, you might not see the final retention until the following spring — a long time to have your money sitting on someone else's balance sheet.

Why retention causes so much pain

Retention money is money you've earned but haven't been paid. For a small or growing contractor, the amounts add up fast across multiple jobs, and the problems compound:

• It's easy to forget. Once a job is finished, attention moves to the next one and the retention quietly ages.
• Release isn't automatic. In practice you usually have to ask — and prove the defects period has passed and issues are closed.
• It's exposed if the paying party fails. If a customer or main contractor becomes insolvent, retention held by them can be lost, because it often isn't ring-fenced.
• The defects window can drift. Disputes about whether something is a "defect" can delay release.

This is why retention reform — including proposals to protect retention money in a separate account or scheme — has been debated in the UK for years. Until anything changes, protecting yourself is down to process.

Practical steps to actually get it back

You can't usually avoid retention, but you can stop losing it:

• Record every retention on every job — amount held, the date practical completion was reached, and the date the defects period ends. If it isn't written down, it will be forgotten.
• Diarise the release dates — both the practical-completion release and the end-of-defects release, with a reminder a couple of weeks before each.
• Close out defects promptly and in writing — the faster you resolve snags and evidence it, the harder it is to justify holding your money.
• Chase release actively — send a clear request when each stage falls due, referencing the contract and the dates.
• Check the contract terms before you sign — the retention percentage, the defects period length, and how release is triggered are all negotiable on some jobs.
• Track your total retention exposure — knowing how much is outstanding across all jobs changes how you think about cash flow and pricing.

The bigger picture: price it in

Because retention delays a slice of your money by months, it has a real cost — that's cash you can't use to buy materials, pay your team, or take on the next job. Sensible contractors factor the cost of that delay into how they price and which contracts they take on, rather than treating retention as "free" security they'll worry about later.

How ScopeKit helps

ScopeKit keeps retention visible instead of buried in a spreadsheet: retention held is tracked per project alongside the rest of your financials, with the completion and defects-period dates recorded so release dates don't slip past unnoticed. When you can see your total retention exposure across every job in one place, it stops being money you quietly write off and becomes money you actually collect.

Retention will always be part of construction contracts. The contractors who get it back reliably aren't the ones with better luck — they're the ones with a system that never forgets.

This guide is general information, not legal or financial advice. Retention terms vary by contract — check yours and take professional advice where needed.