Passing main contract terms down to subcontractors protects a main contractor only where the terms actually work at that level. Six assumptions worth testing.
A back to back subcontract passes the main contract obligations and risks down the chain so that the main contractor is not left carrying a liability it cannot recover. The logic is sound and the execution is often poor, because a clause written for a large contractor on a large contract does not always function when applied to a small specialist on one package.
How to test a claim like this
Test any flowed down clause with three questions. Does the subcontractor have the information and the control needed to comply with it? Would a tribunal regard the obligation as workable at that level? And if the subcontractor breaches it, does the remedy actually put the main contractor back in the position the main contract requires? A clause that fails any of these is decoration: it creates resentment without creating protection.
Myth 1: Attaching the main contract to the subcontract makes it back to back.
Reality: Incorporating a document by reference is not the same as creating workable obligations. A subcontractor handed a main contract and told that its terms apply so far as relevant will not know which obligations bite on its package, and neither will anybody else when the question arises. The result is an argument about what was incorporated rather than a clear allocation.
How to check it yourself: Write the obligations into the subcontract in their own words, specific to that package, rather than relying on a general incorporation clause.
Myth 2: A pay when paid arrangement protects the main contractor cash flow.
Reality: Making subcontractor payment conditional on receipt of payment from above is attractive and legally sensitive, because the enforceability of such provisions varies between jurisdictions and depends on the governing law and the drafting. It also damages the relationship with the subcontractors you most need. Whether a particular provision is effective is a question for a licensed legal adviser.
How to check it yourself: Ask your adviser whether the provision is enforceable under your governing law, and consider instead aligning payment cycles so the timing gap is small by design.
Myth 3: Flowing down the programme obligation makes the subcontractor responsible for the completion date.
Reality: A subcontractor can only be responsible for its own package within the window it was given. It does not control the preceding trades, the access, the information flow or the other packages. An obligation to complete the whole works on time is unenforceable in substance, whereas an obligation to achieve defined package dates with defined resources is both fair and useful.
How to check it yourself: Replace a general completion obligation with specific package start and finish dates, a resource commitment and a notice duty when either is at risk.
Myth 4: Flowing down the notice provisions is enough to protect the main contract position.
Reality: It is necessary but not sufficient. If the subcontract gives the subcontractor the same notice period as the main contract gives the main contractor, the main contractor has no time left to review the notice and pass it up. The periods have to be stepped so that each level has time to act.
How to check it yourself: Set subcontract notice periods materially shorter than the equivalent main contract periods, and state the recipient and the required content.
Myth 5: A back to back subcontract transfers the design risk cleanly.
Reality: Design risk transfers only if the subcontractor has a designer, carries appropriate professional cover and has been given performance requirements it can actually design to. A subcontract that imposes design liability on a company with no designer and no cover leaves the main contractor holding the risk with an extra argument attached.
How to check it yourself: For every design package, confirm the named designer and the professional cover in place, and check the cover responds to the obligation you have imposed.
Myth 6: Identical dispute resolution clauses keep everything in one forum.
Reality: Mirroring the dispute clause helps, but it does not by itself allow a main contractor to bring a subcontractor into a dispute with the employer. Joining parties across contracts depends on the governing law, the institutional rules and the drafting, and getting it wrong means defending the same facts twice in two forums.
How to check it yourself: Ask a licensed legal adviser how your dispute clauses interact across the chain, and whether the drafting permits related disputes to be dealt with together.
Myth 7: A back to back subcontract means the main contractor carries no residual risk.
Reality: Some risk never flows down. Subcontractor insolvency, the time it takes to find a replacement, the cost of the gap in the programme and the main contractor own management failures all remain. The purpose of back to back drafting is to reduce residual exposure, not to eliminate it, and the residual is what the main contractor margin exists to cover.
How to check it yourself: List the risks that remain with you after the subcontracts are let, and make sure your own pricing and contingency reflect them.
What this changes in your decision
- Write package specific obligations into each subcontract instead of relying on general incorporation of the main contract.
- Step the notice periods down the chain so each level has time to review and pass up.
- Replace general completion obligations with defined package dates, resources and notice duties.
- Confirm the designer and the professional cover for every package carrying design responsibility.
- Take legal advice once on the standard subcontract terms, particularly payment conditionality and dispute resolution, and reuse the settled wording.
Domira builds and supervises projects across Saudi Arabia, and the commercial discipline above is how its projects stay inside their budget and their programme. Send the drawings, the contract or the site and Domira will tell you where the risk actually sits.
Frequently Asked Questions
What does a back to back subcontract mean?
It means the subcontract is drafted so that the obligations and risks the main contractor owes upward are passed down to the subcontractor for the part of the works it performs. In practice this covers programme, quality, notices, insurance, safety, defects and payment mechanics. The aim is that the main contractor is not left with a liability it cannot recover from the party that caused it.
Is a pay when paid clause enforceable in a construction subcontract?
It depends on the governing law and on how the provision is drafted, and the treatment of conditional payment provisions differs between jurisdictions and changes over time. Because the answer turns on both, it has to come from a licensed legal adviser for your specific contract. A practical alternative is to align the payment cycles so that the timing gap between receipt and payment down the chain is small.
Should subcontract notice periods match the main contract?
No. If they match, the main contractor receives a subcontractor notice on the last day of its own period and has no time to review or pass it up. Set the subcontract periods materially shorter, so each level in the chain has working time. State the recipient, the method and the required content, and keep a notice register for each package.
Can a main contractor pass all risk down to subcontractors?
No. Subcontractor insolvency, the time and cost of replacing a failed package, programme gaps and the main contractor own management performance stay where they are. Back to back drafting reduces the residual exposure rather than removing it, and a subcontract that tries to transfer risks a small specialist cannot carry tends to produce an unenforceable obligation and a difficult relationship.
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