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The main JCT contracts you’ll see on real projects are: Standard Building Contract, Design and Build, Intermediate Building Contract and Minor Works. There are others (like Management and Major Project forms), but those four cover most day-to-day work.
Start with four questions: How big and complex is the project? Who should carry design responsibility? How much contractual structure do you need around valuation and payment? And how experienced are the parties with JCT admin? Those answers usually narrow you down to one or two obvious forms.
Design and Build fits when the contractor is best placed to coordinate design and construction and the client wants a single point of responsibility. Standard Building is better when the employer wants tighter control of design through their own consultant team and is comfortable with more detailed admin.
Minor Works is fine for genuinely small, simple jobs with limited design and few trades. It becomes risky when people try to squeeze more complex or high-value projects into it just to “keep it simple” – the missing structure comes back as disputes later.
Yes. Heavier forms like Standard Building and Design and Build justify more detailed cost structures, variation logs and formal payment workflows. Simpler forms like Minor Works still need good records, but you can keep the process lighter. The key is that your internal system matches the complexity and risk profile of the form you’re using.
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