When do you need a construction contract?

The need for a construction contract arises when a client engages a contractor for new build, major renovation or infrastructure works and the parties need clear terms on scope, time frames, responsibilities and payment.

What should a construction contract include?

A construction contract should typically cover scope of works, timetable and milestones, pricing and payment terms, variation works, responsibility allocation, delay remedies, warranty and defects liability, and dispute resolution forum, for example arbitration or court litigation.

Construction contract

Q: What is a construction contract?

A construction contract is a civil law agreement between a client and a contractor that sets the conditions for carrying out building or civil engineering works, including responsibility, performance and remuneration.

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Glossary
Construction contract

Explained – what is a construction contract?

A construction contract is a civil law contract between a client and a contractor that sets the conditions for carrying out building or civil engineering works. The contract may cover new build, refurbishment or renovation and can be drafted by a construction contract lawyer. Across Europe, standard form construction contracts such as AB 04 or ABT 06—developed by the Swedish Construction Contracts Committee (Byggandets Kontraktskommitté, BKK)—are frequently used to create clear rules on risk allocation and the allocation of responsibilities. Construction agreements are used primarily in the building and real estate sectors.

When does the issue of a construction contract arise?

The need for a construction contract arises when a client engages a contractor to perform building or civil engineering works and there is a need to define responsibilities, time frames and remuneration with clarity. This typically occurs for a new building, major renovation or infrastructure project. Where several parties are involved, a well-structured construction agreement is central to dispute prevention.

Illustration of a construction contract document with cranes in the background, representing building project agreements, contractor obligations, and construction law compliance.

Key points to consider in a construction agreement

When preparing a construction contract there are several critical points to ensure legal certainty and avoid ambiguity.

Clearly define the scope of works (for example, design and construction/total contract or build only/execution contract).
Set a time schedule and project timetable, including interim milestones and the completion date.
Specify the pricing model and payment terms, for example fixed price/lump sum or time and materials/cost reimbursement.
Include rules for variation works: change orders, additional works and contract variations.
Specify the allocation of responsibilities for materials, subcontractors and authority/permit requirements (responsibility matrix).
Include provisions on delay and remedies, such as liquidated damages (penalty clause).
Regulate the warranty period and defects liability, including the defect liability period and warranty terms after completion.
Set out the dispute resolution mechanism and forum clause, for example arbitration or court proceedings/court litigation.

Addressing these points reduces the risk of uncertainty and disputes between the parties, creating contractual certainty and a more secure contractual relationship.

Construction contract

Why is a construction contract important?

A construction contract creates clarity around responsibility, project timeline and compensation terms in construction projects. Without a well-drafted agreement, the parties risk conflict over contract scope or costs.

A robust construction agreement protects both sides. The client can ensure that the contractor performs the works in line with the agreed terms, while the contractor gains a clear framework for its obligations and rights, including design responsibility where relevant. Standard forms AB 04 and ABT 06 are designed to reduce uncertainty, support a balance of interests and allocate liability and risk fairly.

From a business perspective, a clear, enforceable construction contract builds trust and long-term relationships in the sector. A well-drafted document strengthens efficiency and legal certainty, which in turn supports successful delivery, timely handover and acceptance, and satisfied stakeholders.

AB 04 governs execution contracts (traditional procurement/build only contract) where the client is responsible for design, while ABT 06 governs design and construction (design build contract/total contract) where the contractor is responsible for both design and execution.

A construction contract should always be concluded before works commence, to clearly regulate scope, time frames and remuneration, including the project timetable and completion arrangements.

Ensure clear provisions on contract scope, project timeline and pricing model, and regulate variation works and change orders. A transparent dispute resolution clause—arbitration or court—also helps. Early involvement of a construction contract lawyer can further strengthen dispute prevention.

Scope definition and type of procurement (design and execution vs build only)
Time schedule, milestones and completion date
Remuneration and pricing model (for example lump sum or time and materials)
Allocation of responsibilities and risk distribution
Variation works: change orders and additional works
Defects liability, warranty period and final inspection/acceptance
Dispute resolution mechanism and forum clause

Risk allocation depends on the procurement model and the agreed terms. In a design and construction/total contract, the contractor bears greater responsibility for design and execution; in an execution contract the client carries more design-related risk.

Standard form construction contracts such as AB 04 and ABT 06 provide a uniform structure that reduces misunderstandings. Widely used across Europe, they promote balanced liability allocation, clear payment terms and predictable outcomes. Organisations often benefit from legal support to ensure the agreement meets all requirements from tender to completion and handover.