Strict rule: Performance must be complete and exact. If one party doesn't exactly fulfil their obligations, the other party doesn't have to fulfil their obligations either - Cutter v Powell
The strict rule can be avoided in 4 ways:
Prevention of full performance
Acceptance of part performance
Divisible contracts
Substantial performance
1. Prevention of full performance
If one party prevents the other from carrying out the contract, the innocent party can claim on a quantum meruit basis - Planche v Colburn
D prevents C from carrying out their obligations
2. Acceptance of part performance
There must be consent for this to apply and it has to be free from pressure
If the parties agree that the other doesn't have to complete the full contract, they must be paid on a quantum meruit basis
It is not considered to be consent if the innocent party has no option but to take the benefit of the work done - Sumpter v Hedges
3. Divisible contracts
If the contract has separate parts, this is a divisible contract
The contract must be clearly divided for this to work
Non-completion of one part doesn't breach the entire contract - Richie v Atkinson
4. Substantial performance
This is where you haven't completed all of your obligations but you have completed enough according to the courts - Darkin and Co v Lee
Payment must be completed for the appropriate work done on a quantum meruit basis - Hoenig v Isaacs
This does not apply if the contract is seen as a single transaction
If the work hasn't been substantially performed, the party who carried out the work will not be entitled to anything - Bolton v Mahadeva
Whether time of performance is important
Some contracts explicitly state time, time is seen as a condition in the following circumstances;
1. The parties expressly stated in the contract that 'time is of the essence' - Union Eagle v Golden Achievement
2. In the circumstances, time of completion is critical for the contract
3. One party hasn't performed on time, so the other party has insisted on another date of completion
Remedies
Quantum meruit - C can claim for the work they have completed
Repudiation - The contract comes to an end
Specific performance - The court will specify what needs to happen for the dispute to be resolved