RISINGBEIS / Build UK / RICS / SECGMarch 24, 2026🇬🇧 UKHousing
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UK Construction Retentions Ban 2026: Calculate Your Cash Flow Impact

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The UK Government is legislating to ban cash retentions in construction — a practice where 3-5% of contract payments are withheld, locking up £6-10 billion across the UK supply chain. Over £700 million is lost annually when main contractors become insolvent. The ban is expected to take effect in 2027 after Royal Assent and a transition period. This calculator helps contractors and subcontractors quantify exactly what the ban means for their working capital.

Concept Fundamentals
£6-10B
Industry Retentions
£700M/yr
Lost to Insolvency
5% then 2.5%
Standard Rate
4,000+
Insolvencies 2024

Ready to run the numbers?

Why: The UK construction retentions ban is a major regulatory change affecting every subcontractor — high professional intent searchers needing a cash flow model.

How: Enter your annual turnover, retention rate, project duration, DLP length, and bad debt rate to see the full financial picture of retentions and the ban impact.

You see total retention locked, annual bad debt and overdraft cost, and the working capital freed when the ban takes effect.
Sources:BEISBuild UK

Run the calculator when you are ready.

Calculate Retention ImpactUse the calculator below to see how this story affects you personally

For educational and informational purposes only. Verify with a qualified professional.

🏗️ UK Construction Retentions Ban 2026 — What it Means

The UK Government is legislating to ban cash retentions in construction contracts — a practice that has seen £6-10 billion locked up across the supply chain at any given time. Over £700 million is lost annually when main contractors become insolvent and retention funds disappear. The ban, expected to take effect in 2027 after a transition period, will either ring-fence retentions in deposit schemes or abolish them entirely. This is the most significant cash flow reform in construction in a generation.

📊 Full Cost of Retentions for Your Business

Total retention locked vs annual costs from bad debt and overdraft financing

📊 Revenue Earned vs Cash Received

How retention creates a gap between earned revenue and cash actually received

📈 Projected Retention Release Timeline

How retention unlocks over the project lifecycle from start to end of DLP

📋 Typical JCT Retention Clause

Construction Phase: 5% withheld from each payment
At Practical Completion: Rate reduces to 2.5%
First Moiety: 2.5% released at PC
Second Moiety: 2.5% released at end of DLP
DLP Duration: Typically 6-12 months
Total withheld: 5% of contract value during works

⚠️ UK Industry Insolvency Risk

£6-10B in retentions outstanding (industry-wide)
£700M+ lost annually to contractor insolvencies
4,000+ construction insolvencies in 2024-25
Unsecured creditors recover 0-10p in the pound
Specialist subcontractors most vulnerable

✅ Preparing for the Retentions Ban

Review all existing contracts: Identify current retention clauses and outstanding balances owed to you and held by you.

Model your cash flow: Use this calculator to quantify exactly how much working capital you will unlock when retention reform takes effect.

Transition to performance bonds: Clients will need alternative security. Familiarise yourself with performance bond and insurance market options as a replacement.

Update standard terms: Work with your solicitor to update contract templates for the post-ban regime — new retention deposit scheme provisions will need incorporating.

Engage your supply chain: If you are a main contractor, communicate transparently with subcontractors about the transition timeline and new payment processes.

❓ Frequently Asked Questions

What is the UK construction retentions ban and when does it take effect?
The UK Government announced a ban on cash retentions in construction contracts as part of broader payment reform legislation. Retentions are sums (typically 3-5% of contract value) withheld by main contractors from subcontractors as security against defective work. Under the ban, retentions must either be placed in a retention deposit scheme (ring-fenced from insolvency) or abolished entirely. The legislation was introduced to Parliament in 2026 and is expected to be phased in with a 12-24 month transition period after Royal Assent.
How much money is tied up in construction retentions in the UK?
Industry estimates suggest £6-10 billion in construction retentions are outstanding across the UK supply chain at any given time, per Build UK and RICS research. Approximately 50,000+ construction businesses hold or are owed retentions. The average subcontractor has 3-8% of annual turnover tied up in unpaid retentions. Smaller specialist subcontractors (M&E, cladding, groundworks) are disproportionately affected as they work in high volumes across many main contractors simultaneously.
What is the bad debt risk from retentions?
According to the Specialist Engineering Contractors Group (SECG), over £700 million in retention money is lost every year to construction insolvencies. When a main contractor goes into administration, retention funds are treated as unsecured creditor claims — typically recovering 0-10p in the pound. The construction industry has the highest insolvency rate of any UK sector (over 4,000 insolvencies in 2024-25). Subcontractors routinely write off 1-3% of retention owed each year as irrecoverable bad debt.
How are retentions typically structured in a construction contract?
Standard UK retention clauses (JCT and NEC contracts) withhold 5% of each interim payment during the construction phase, reducing to 2.5% once practical completion is certified. Half the total retention (the first moiety) is released at practical completion; the remaining half at the end of the defects liability period (typically 6-12 months later). On a £1M contract at 5%, this means £25,000 tied up for the defects period — potentially 18-30 months from the start of work.
What does the retentions ban mean for cash flow?
For subcontractors, the retentions ban is significantly positive. A company with £5M annual turnover and 5% retention has approximately £250,000 locked up. When released, this improves working capital, reduces overdraft costs, and funds growth. For main contractors, it reduces leverage over subcontractors but also removes the administrative burden of tracking and releasing retentions. Clients (employers) benefit from a more solvent supply chain that can deliver quality work without financial pressure.
What is the difference between a retention deposit scheme and abolition?
Under the retention deposit scheme model (similar to residential tenancy deposit schemes), retentions are held in a government-regulated third-party account — not accessible to the holding party in case of insolvency. This preserves the security function for clients while protecting subcontractors. Full abolition would require alternative security mechanisms like insurance bonds or performance guarantees. Industry consultation in 2025-26 is debating which model delivers the best balance between security and cash flow.

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