Source: https://www.quantsurv.com/library/glossary/cdp
Content format: Markdown version of the public page.
Content reviewed: 2026-10-10

# CDP (contractor's designed portion)

The part of a JCT building contract that the contractor designs.

by [Jack Butler-Kettle](<https://www.quantsurv.com/about#jack-butler-kettle>) · About 1 min readShare

## Further detail

Read this alongside [JCT Design and Build Contract 2016: Simply Fair](<https://corporate.jctltd.co.uk/jct-design-and-build-contract-2016-simply-fair/>).

A contractor's designed portion identifies design work allocated to the contractor within the relevant JCT arrangement. A subcontractor's duties depend on what its own appointment passes down. Design development, coordination and responsibility for specified performance may involve different obligations.

Compare the design scope with qualifications and insurance requirements. A [Construction contract review before signing](<https://www.quantsurv.com/quantity-surveying?service=%2Fcontract-review%2Fservices%2Fpre-signing-contract-review#client-types>) can highlight obligations needing agreement before design starts.

## Sources

1.  [JCT Design and Build Contract 2016: Simply Fair (12 July 2017)](<https://corporate.jctltd.co.uk/jct-design-and-build-contract-2016-simply-fair/>). The Joint Contracts Tribunal.

[Browse the Library](<https://www.quantsurv.com/library>)