The Joint Contracts Tribunal (JCT) publishes a family of standard form construction contracts designed for different project types, procurement strategies and levels of complexity. Selecting the right form is critical to how risk, cost and design responsibility are allocated on a project.

This guide explains the main types of JCT contract, when each is typically used, how they differ in terms of design responsibility and payment basis, and the practical considerations for choosing between them. For a broader overview of how JCT contracts work, see our main guide on JCT contracts.

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Summary of JCT Contract Types

At a high level, the main JCT contract types are typically used as follows:

  • Minor Works: Small, simple projects with limited specialist content.
  • Intermediate: Moderately complex projects with developed design and some specialist sub-contract content.
  • Standard Building Contract: Larger or more complex projects with completed employer-led design.
  • Design and Build: Projects where the contractor takes responsibility for design as well as construction.
  • Management Contract / Construction Management: Larger projects delivered through multiple trade packages, often fast-track.
  • Major Project Construction Contract: Major schemes for experienced clients with sophisticated procurement.
  • Constructing Excellence: Collaborative and partnering arrangements with integrated team delivery.
  • Measured Term: Ongoing programmes of maintenance or minor works over an agreed period.
  • Home Owner: Simplified forms for residential homeowners.

Value bands are guidance rather than strict rules - complexity, programme and risk profile usually matter more than headline contract value.

JCT Standard Building Contract (SBC)

The JCT Standard Building Contract is the most detailed of the main JCT forms and is widely used on larger or more complex building projects where the design is substantially complete before construction begins.

Typical Use

  • Larger commercial, residential, education, healthcare or leisure projects.
  • Schemes procured through traditional single-stage tendering with a fully designed scheme at tender.
  • Projects where the employer retains control of design and quality through an appointed design team.

Design Responsibility

The contractor is responsible only for construction. The employer's design team is responsible for design. A Contractor's Designed Portion can be incorporated for specific elements (such as mechanical and electrical design or specialist sub-contractor design) where some design responsibility transfers to the contractor.

Variants

  • With Quantities (SBC/Q): Used where a Bill of Quantities is prepared by a quantity surveyor and forms part of the contract documents.
  • Without Quantities (SBC/XQ): Used where there is no Bill of Quantities and the contractor prices from drawings and specifications.
  • With Approximate Quantities (SBC/AQ): Used where quantities are estimated and the final contract sum is adjusted by remeasurement.

Key Features

  • Comprehensive provisions for variations, extensions of time, loss and expense and certification.
  • Detailed payment provisions compliant with the Construction Act.
  • Provision for named or domestic sub-contractors and listed sub-contractors for specified work packages.
  • Robust dispute resolution provisions including adjudication, mediation, arbitration and litigation options.

When to Avoid

  • Smaller, straightforward projects - the level of administration is disproportionate.
  • Projects where significant contractor-led design is needed - a Design and Build form is more appropriate.

JCT Design and Build Contract (DB)

The JCT Design and Build Contract transfers responsibility for completing the design to the contractor alongside the construction works. It provides a single point of contractual responsibility and is widely used across the UK construction industry.

Typical Use

  • Residential developments, particularly housing led by housing associations and private developers.
  • Commercial schemes where a Developer's Brief is converted into an Employer's Requirements document.
  • Projects where fast-track delivery is needed, allowing some overlap between design and construction.
  • Procurement routes where the contractor's expertise in buildability is intended to lead design development.

Design Responsibility

The contractor is responsible for completing the design and for the integration and coordination of the design. The employer issues Employer's Requirements setting out the project brief and key constraints, against which the contractor submits Contractor's Proposals.

Design risk transfers to the contractor, but the quality of the Employer's Requirements is critical. Weak Employer's Requirements often lead to contractor design decisions that do not meet the employer's expectations.

Key Features

  • Single point of responsibility for design and construction.
  • Typically procured on a lump sum basis with payment by stages or interim valuation.
  • Administered by an Employer's Agent rather than an architect - see our Employer's Agent service.
  • Professional indemnity insurance is required to cover the contractor's design liability.

When to Avoid

  • Projects where the client requires close control over design quality and detail.
  • Heritage or highly specified schemes where design intent must be preserved through delivery.
  • Projects with an incomplete or weakly developed brief - the design risk transferred to the contractor will likely be reflected in price or quality.

JCT Intermediate Building Contract (IC / ICD)

The JCT Intermediate Building Contract sits between the Minor Works and Standard Building Contract in scope and complexity. It is widely used for moderately complex projects that need more contractual sophistication than the Minor Works form provides but do not require the full machinery of the Standard Building Contract.

Typical Use

  • Mid-sized commercial, residential, education or community projects.
  • Schemes with developed design at tender and some specialist sub-contract content.
  • Refurbishment and extension projects of moderate complexity.

Design Responsibility

The standard Intermediate Building Contract (IC) is used where the contractor has no design responsibility. The Intermediate Building Contract with Contractor's Design (ICD) is used where the contractor takes responsibility for a defined portion of the design.

Key Features

  • Named sub-contractor provisions allowing the employer to specify named sub-contractors for particular work packages.
  • Developed payment, variation, extension of time and loss and expense provisions.
  • Less administrative overhead than the Standard Building Contract.
  • Compatible with traditional single-stage or two-stage tendering.

When to Avoid

  • Very small, simple works - the Minor Works form is usually more proportionate.
  • Major or highly complex projects - the Standard Building Contract provides more comprehensive protections.

JCT Minor Works Building Contract (MW / MWD)

The JCT Minor Works Building Contract is the shortest and simplest of the main JCT contracts. It is designed for smaller, lower-value projects with straightforward requirements and limited specialist content.

Typical Use

  • Small extensions, refurbishments and alteration projects.
  • Light commercial fit-out works of limited scope.
  • Projects with a fully developed design that can be tendered on a lump sum basis without significant variation.

Design Responsibility

The standard Minor Works Contract (MW) is used where the contractor has no design responsibility. The Minor Works Contract with Contractor's Design (MWD) is used where the contractor takes responsibility for a defined portion of the design.

Key Features

  • Short, simple document with limited administrative overhead.
  • Lump sum contract with stage payments or interim valuations.
  • Basic variation, payment and extension of time provisions.
  • No named sub-contractor provisions.

When to Avoid

  • Projects with significant change anticipated during construction - the variation mechanisms are less developed.
  • Projects involving specialist sub-contractors that require named sub-contractor provisions.
  • Complex projects where stronger contractual protections are needed - the Intermediate or Standard Building Contract is usually more appropriate.

JCT Management Contract (MC)

The JCT Management Contract is used on more complex projects where the works are divided into multiple trade packages, each let to a works contractor under sub-contracts managed by a management contractor.

Typical Use

  • Large, complex commercial or institutional projects.
  • Fast-track schemes where work can start on early packages before all design is complete.
  • Projects where the employer benefits from the management contractor's expertise during the design and procurement stages.

Design Responsibility

The employer retains responsibility for design through the design team. The management contractor is responsible for procurement, programme management and coordination of the works contractors.

Key Features

  • Management contractor is paid a fee plus the cost of the works contractor packages.
  • Allows early start on enabling and foundation works before later packages are designed.
  • Pricing risk is spread across multiple packages and only confirmed as packages are tendered.
  • Requires sophisticated client-side management to control overall cost and programme.

When to Avoid

  • Smaller or simpler projects - the administrative overhead is disproportionate.
  • Clients with limited construction experience and no strong client-side advisory team.
  • Projects where cost certainty at the outset is essential.

JCT Construction Management Agreement (CM)

The JCT Construction Management Agreement is similar in concept to the Management Contract but with a key structural difference: under construction management, the employer contracts directly with each trade contractor rather than through a management contractor.

Typical Use

  • Large, complex projects led by experienced clients with strong in-house or advisory teams.
  • Fast-track delivery where early packages can start while later design progresses.
  • Projects where the client wants direct control of each trade contractor's appointment and performance.

Design Responsibility

The design team retains responsibility for design. The construction manager provides programme, coordination and procurement advice but does not contract for the works.

Key Features

  • Direct contracts between the employer and each trade contractor.
  • Construction manager is paid a fee for advisory and management services.
  • Maximum flexibility but maximum client-side risk - the employer carries trade contractor coordination risk directly.

When to Avoid

  • Clients without experienced project leadership and strong advisory support.
  • Smaller projects where direct contracting with multiple trade contractors adds disproportionate complexity.

JCT Major Project Construction Contract (MP)

The JCT Major Project Construction Contract is designed for major projects procured by experienced clients with sophisticated commercial requirements. It is intended to be amended significantly by the parties to fit specific commercial arrangements.

Typical Use

  • Large-scale commercial, residential or institutional schemes.
  • Projects led by experienced employers with developed procurement strategies.
  • Schemes where bespoke commercial terms are typically required.

Key Features

  • Single-stage or two-stage procurement.
  • Contractor design responsibility is built in, similar to the Design and Build contract.
  • Designed to be tailored by amendment for the specific project.
  • Less prescriptive than the Standard Building Contract or Design and Build form.

When to Avoid

  • Less experienced clients who need a more prescriptive standard form.
  • Smaller projects where the level of bespoke amendment is unwarranted.

JCT Constructing Excellence Contract (CE)

The JCT Constructing Excellence Contract is a more collaborative form designed for partnering arrangements and integrated team delivery. It places greater emphasis on collaboration, risk sharing and proactive management than the traditional JCT forms.

Typical Use

  • Projects delivered under partnering or framework arrangements.
  • Schemes where collaboration and shared decision-making are central to delivery.
  • Repeat or framework relationships where parties want a contractual framework that supports collaborative working.

Key Features

  • Collaborative working obligations and joint decision-making mechanisms.
  • Risk-sharing and incentive arrangements such as target cost or pain-gain mechanisms.
  • Less common than the other JCT forms - parties should consider whether existing teams are familiar with the approach.

JCT Measured Term Contract (MTC)

The JCT Measured Term Contract is used for ongoing programmes of maintenance, minor works or planned repairs carried out over an agreed period rather than as discrete projects.

Typical Use

  • Planned and reactive maintenance programmes for housing portfolios, schools, healthcare or commercial estates.
  • Minor works programmes carried out across multiple properties under a single contractual framework.

Key Features

  • Works are instructed as individual orders against an agreed schedule of rates.
  • Contract runs for an agreed term, with provisions for extension or termination.
  • Suitable for repeat or framework arrangements with a known contractor.

JCT Home Owner Contracts (HOC)

The JCT Home Owner Contracts are simplified forms designed for residential homeowners commissioning small building works directly from a contractor. They are not generally used by professional clients or developers.

Typical Use

  • Domestic extensions, refurbishments and alteration projects commissioned by individual homeowners.
  • Smaller residential works where the homeowner deals directly with the contractor.

Key Features

  • Written in straightforward language for consumer use.
  • Variants for use with or without a consultant.
  • Includes a simplified payment and variation procedure.

How to Choose Between JCT Contract Types

Selecting the right JCT contract type is rarely a binary decision. The form must align with several project characteristics that are best considered together:

  • Project complexity: Simpler projects suit Minor Works or Home Owner forms; moderately complex projects suit the Intermediate Building Contract; complex projects suit the Standard Building Contract, Design and Build, Management Contract or Major Project Contract.
  • Design responsibility: If the design will be largely complete at tender, a lump sum form such as the Standard Building Contract is well suited. If the contractor will lead on design, the Design and Build form is more appropriate.
  • Procurement route: Traditional single-stage tendering, two-stage tendering, management contracting and construction management each suit different JCT forms.
  • Programme requirements: Fast-track projects often suit Design and Build, Management Contract or Construction Management approaches that allow early packages to start before later design is complete.
  • Cost certainty needs: Lump sum contracts (SBC, DB, IC, MW) provide the greatest cost certainty at the outset; management and construction management arrangements give less.
  • Client experience: Less experienced clients are often better served by forms that allocate more responsibility to the contractor and reduce client-side administrative burden.
  • Risk profile: The right form depends on which party is best placed to manage particular risks - design risk, programme risk, cost risk and contractor coordination risk.

BuildAlliance recommends that contract selection is considered alongside procurement strategy as part of early feasibility - not left until tender stage.

Frequently Asked Questions

What are the main types of JCT contract?
The main JCT contract forms are the Standard Building Contract, Design and Build Contract, Intermediate Building Contract, Minor Works Building Contract and Management Contract. The full suite also includes the Construction Management, Major Project, Constructing Excellence, Measured Term and Home Owner contracts.

How many types of JCT contract are there?
There are around ten main contract families in the JCT suite, each with variants. These cover projects ranging from small home repairs through to major commercial and infrastructure schemes.

What is the difference between JCT Minor Works and Intermediate Building Contracts?
Minor Works is designed for small, simple projects with limited specialist content. Intermediate is more detailed and suited to moderately complex works, including named sub-contractor provisions, more developed payment mechanisms and stronger contractual protections.

When should I use a JCT Design and Build contract?
A Design and Build contract is appropriate where the contractor will take responsibility for both design and construction - typically used for residential developments, fast-track schemes or where the contractor's expertise will lead the design.

Which JCT contract is best for a small project?
The Minor Works Building Contract is usually the most appropriate form for smaller, simpler projects. The Home Owner Contracts are an alternative for residential homeowners commissioning building works directly.

What is the JCT Standard Building Contract used for?
The Standard Building Contract is used for larger or more complex projects where the design is substantially complete before construction begins, procured through traditional single-stage tendering.

What is the JCT Management Contract used for?
The Management Contract is used on more complex projects where construction works are divided into multiple trade packages let by a management contractor - well suited to fast-track delivery and projects where scope is not fully defined at the outset.

What is the difference between JCT Management Contract and Construction Management?
Under a Management Contract, the management contractor holds the sub-contracts with the trade contractors. Under Construction Management, the employer contracts directly with each trade contractor and the construction manager acts as advisor only.

Can JCT contracts be amended?
Yes - amendments are common, particularly to align the contract with the project's specific procurement strategy, insurance arrangements or commercial requirements. Care should be taken to ensure amendments do not create unintended consequences or contradict other contract provisions.

Need Help Selecting the Right JCT Contract?

Choosing the right JCT contract is a critical decision that affects how risk, cost and design responsibility are allocated. BuildAlliance provides structured advice on procurement and contract selection through our Employer's Agent & Contract Administration and Project Management services. Early conversations save time and money.

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Reviewed by Scott Edwards, Director, BuildAlliance - last updated June 2026.