You hit your numbers, deliver the project on schedule, and hand over the site. But then the main contractor applies a standard 5% JCT cash retention.
That 5% retention isn’t just “paperwork.” That is your net profit sitting in someone else’s bank account for 12 to 24 months. If you don’t factor held retentions into your cash flow, your actual take-home day rate drops significantly.
The Real Numbers: What a 5% Retention Costs You
Consider an £85,000 commercial subcontract under standard JCT terms:
Total Cash Withheld (5%): £4,250.00
Tranche 1 Payout (50%): £2,125.00 due immediately on Practical Completion (PC).
Tranche 2 Payout (50%): £2,125.00 held until the Defects Liability Period (DLP) ends (typically 12 months later).
Financial Holding Cost Risk (at 5% interest/opportunity cost) £212.50 in pure financing drag over 12 months.
Having £4,250.00 locked away for a year means you are effectively financing the main contractor’s cash flow using your own profit margin. Every month Tranche 2 sits unpaid past its legal release date, your daily return on that project degrades further.
Extended Defects Liability Periods: Pushing Tranche 2 release out to 18 or 24 months
“Pay-When-Paid” Traps: Trying to make your retention release dependent on the client paying the main contractor (which is illegal under UK construction law, yet frequently slipped into subcontracts).
Unreasonable Sign-off Delays: Refusing to issue Practical Completion certificates on time, which prevents the 12-month DLP countdown from starting.
How to Protect Your Cash Flow & Day Rate
You don’t have to accept cash flow delays as an inevitable cost of commercial site work. Take these three steps on every commercial tender:
Calculate Your Release Dates Before Signing: Do not rely on messy site diaries or verbal promises. Know the exact calendar dates when your Tranche 1 and Tranche 2 money is legally due.
Scan the Subcontract Fine Print: Check for modified clauses that allow the main contractor to hold your retention indefinitely.
Verify Your Commercial Tender Credibility: Main contractors inspect your business credentials and web presence before awarding £50k+ tenders. Ensure your business passes commercial supplier checks so you never suffer competitor loss on major bids.
Calculate Your Retention Release Dates Free
Stop guessing how much profit is locked up in your subcontracts. Try the free JCT Retention Risk Estimator built by Steve Dean at Your Tech Neighbour:
💡 FREE JCT RETENTION RISK ESTIMATOR
Plug in your gross contract value and dates to calculate your exact Tranche 1 & 2 release dates, total cash withheld, and holding risk in under 10 seconds. No sales calls, no sign-ups, no corporate fluff.
Stop Losing Commercial Tenders to Competitors
Main contractors inspect your paperwork, safety credentials, and digital presence before awarding major subcontracts. Don’t let competitor loss ruin your pipeline because of an outdated web presence or missing compliance details.
GET YOUR FREE TRADE WEB AUDIT AT YOUR TECH NEIGHBOUR
SCAN YOUR SUB-CONTRACT FOR HIDDEN TRAPS AT TRADE CONTRACTS SIMPLIFIED