'Vicarious performance' refers to the carrying out of contractual obligations by a person that is not party to a contract, usually by sub-contract or assignment. So, for example, performance by a sub-contractor constitutes vicarious performance on behalf of the main contractor, who remains fully responsible for the work, except where the main contract provides otherwise.
Whether the contractor is allowed to delegate vicarious performance of either all or some of their obligations to a third party will depend on the terms of the contract.
Vicarious performance of the work and whether it is permitted is usually decided based upon whether it either:
- Does not matter who does the work.
- Or, the contract expressly prohibits it.
'British Waggon Co. v Lea' (1880), is often viewed as being the authoritative case. The original contractor contracted to keep railway carriages in repair over a number of years. On liquidation, the benefit and burden of the contract was assigned to British Waggon. Lea could not refuse performance despite the assignment. Cockburn CJ stated:
'All that the hirers, the defendants, cared for in this stipulation was the wagons should be kept in repair; it was indifferent to them by whom the repairs should be done. Thus if, without going into liquidation, or assigning these contracts, the company entered into a contract with a competent party to do the repairs, and so procured them to be done, we cannot think that this would have been a departure from the terms of the contract to keep the wagons in repair.'
The British Waggon ruling may not apply where the contractor has been chosen for its specialist skills, reputation and ability to perform complex operations efficiently.
 Related articles on Designing Buildings Wiki
- Back-to-back provisions in construction contracts.
- Common law.
- Construction contracts.
- Contractor vs supplier.
- Domestic sub-contractor.
- Named specialist work.
- Named sub-contractor.
- Nominated sub-contractor.
 External references
- 'Construction Contract Law: The Essentials', ADRIAANSE, A., Palgrave MacMillan (2005)
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