A delayed concrete delivery, an unexpected ground condition, or a late design decision can turn a well-planned construction project into a dispute within days. Knowing how to manage AB04 claims is therefore not just a contract-administration task. It is a way to protect the project schedule, preserve commercial relationships, and secure the evidence needed if the matter cannot be resolved at the project level.
AB 04 is widely used in Swedish building and civil engineering projects, but it does not operate automatically. The parties must have incorporated it into their agreement, often alongside project-specific administrative provisions, technical specifications, and tender documents. Those documents must always be read together. A claim that appears straightforward under AB 04 may be affected by a special contract provision, an agreed notice procedure, or the allocation of responsibility in the project documents.
Start with the Contract and the Actual Event
Effective claims management begins before anyone sends a claim letter. First, identify exactly what has happened and why it matters. Is the contractor seeking additional time, additional payment, or both? Is the client asserting delay damages, a defective performance claim, or a right to require corrective work? The answer determines which contractual provisions, facts, and records will be most relevant.
Under AB 04, many claims arise from changes and additional works, commonly referred to as ÄTA works, as well as disruptions, delays, variations in quantities, unforeseen conditions, and issues caused by the other party. The contractual label matters less than the underlying facts. A contractor should be able to explain the event in a clear sequence: what changed, when it became known, how it affected the work, what measures were taken, and what compensation or time impact is requested.
For the client, the same discipline is essential. Before rejecting a claim, establish whether the instruction was actually given, whether it altered the agreed scope, and whether the contractor had a contractual duty to investigate or absorb the relevant risk. Quick assumptions can become expensive if they are inconsistent with site records or the project correspondence.
Read the Contract Documents in the Correct Order
Disputes often begin with two parties relying on different documents. The administrative provisions may regulate notice requirements, authorized representatives, pricing methods, or deviations from AB 04. Drawings, specifications, meeting minutes, schedules, and written instructions can also affect the result.
Create a contract matrix early in the project. It should identify the order of precedence between documents, the persons authorized to issue instructions, the agreed payment model, the completion date, and any special provisions on ÄTA work, delay, or dispute resolution. This gives the project team a practical reference point when events arise under time pressure.
Give Notice Promptly and in Writing
A common mistake is treating notice as a formality that can be dealt with when the final account is prepared. Under AB 04, prompt communication is central. Depending on the type of claim and the agreed contract terms, delayed notice may weaken a party’s position or create an argument that the other party was deprived of the opportunity to assess, prevent, or reduce the claimed effect.
A useful notice does not need to resolve every pricing issue at once. It should, however, clearly identify the event, the relevant work, the anticipated consequence, and the party’s position that it may seek additional time or compensation. Avoid vague language such as “we reserve all rights” without explaining what has occurred. A reservation without facts rarely helps the project move forward.
Send notices through the channels specified in the agreement and keep proof of delivery. If the project uses a document-management platform, make sure that the contractual representatives receive the notice and that the system record is preserved. A discussion at a site meeting may be valuable, but it should be confirmed in writing afterward.
For clients, prompt responses are equally important. If a claim is unclear, request the missing particulars. If an instruction is disputed, state the client’s position while ensuring that the project is not unnecessarily brought to a halt. Silence can create avoidable uncertainty and make later negotiations more difficult.
Build the Record While the Work Is Ongoing
Claims are usually won or lost through contemporaneous evidence, not reconstructed accounts created months after completion. The most persuasive record is one that was made as the work occurred and can be tied to the contractual issue in question.
Daily site logs should record labor, equipment, deliveries, weather conditions where relevant, work areas, disruptions, instructions, and the activities affected. Meeting minutes should accurately reflect decisions, objections, and agreed next steps. Photographs should be dated and connected to a specific location or event. Updated schedules should show both the original plan and the claimed impact.
Cost records need the same care. If a contractor seeks payment for additional work, it should be possible to trace labor hours, materials, subcontractor costs, equipment, and site overhead to that work. Generic cost summaries are difficult to verify and invite disagreement. The stronger approach is to maintain a separate cost code or claim file from the start of the event.
There is a practical trade-off here. Excessive administration can slow a project down, particularly on smaller jobs. But the solution is not to abandon documentation. Use proportionate routines: a concise daily log for routine matters, and a more detailed event file when a change, delay, or disruption has a meaningful financial or schedule effect.
Separate Entitlement, Time, and Money
Parties often try to negotiate every part of a claim at once. That can make a manageable issue seem impossible. A more effective approach is to separate three questions.
First, is there contractual entitlement? In other words, does the event give the claiming party a right under the agreement? Second, did the event affect the completion date or another contractual milestone? Third, what is the financial consequence? These questions are connected, but they require different evidence.
A contractor may have a valid right to additional payment for a change but still need to show that the change affected the critical path before receiving an extension of time. Conversely, a delay event may justify a time extension without supporting every cost item claimed. Clients should assess each part independently rather than adopting an all-or-nothing position.
This structure also improves negotiations. The parties may be able to agree that an event was outside the contractor’s original scope, while reserving the pricing method for later review. That can allow the work to continue without either party giving up a legal position.
Control ÄTA Work Before It Becomes a Final Account Dispute
ÄTA work is one of the most frequent sources of conflict in AB 04 projects. The risk increases when site personnel give informal instructions, the scope is not described clearly, or pricing is postponed until the end of the job.
Establish a simple written workflow. An instruction should state what work is requested, who requested it, why it is needed, whether it is treated as ÄTA work, and how time and compensation will be handled. If immediate action is necessary for safety or to avoid greater damage, document the urgency and confirm the instruction as soon as possible.
Not every disagreement must stop the work. In many cases, the contractor should proceed under protest or with an express reservation, provided that the contractual situation supports that approach and the instruction is sufficiently clear. The key is to avoid allowing disputed work to become invisible in the project records.
Clients should ensure that only authorized representatives can order changes. Contractors should verify that authority before relying on a site-level request. A technically sensible instruction may still create a payment dispute if it came from someone without the contractual power to alter the scope.
Use Meetings to Solve the Claim, Not Merely Report It
Regular claim reviews can prevent a small issue from becoming a formal dispute. The meeting should focus on specific event files, not general frustration about the project. For each open claim, identify the event, current documentation, requested action, responsible person, and next decision date.
A constructive process does not mean accepting unsupported claims. It means addressing the real issue early enough to limit the consequences. The client may ask for updated calculations, alternative mitigation measures, or schedule analysis. The contractor may propose a practical solution that reduces disruption in exchange for a timely decision. Both sides benefit from knowing which issues are agreed, which remain disputed, and what must happen next.
Where the stakes are significant, legal counsel should be involved before communications become entrenched. Early legal input can help preserve contractual rights, assess the strength of a claim, and frame correspondence in a way that supports a commercial solution rather than escalating the conflict by accident.
Prepare for Resolution Without Assuming Litigation
Most construction claims are resolved through negotiation, adjustment of the final account, or a focused settlement. Even so, manage every material claim as though an independent decision-maker may later need to understand it. Preserve the original records, avoid altering logs after the fact, and ensure that internal assessments are handled appropriately.
Before entering settlement discussions, define the business objective. A party may prioritize completing the project, recovering a specific cost, avoiding delay damages, preserving a key commercial relationship, or obtaining finality. The best legal argument is not always the best commercial outcome. That assessment depends on the evidence, the amount at stake, the project stage, and the consequences of a prolonged dispute.
At Advantage Advokatbyrå, we help clients assess AB 04 claims with both the contract and the project reality in view. A disciplined claims process gives you more than a stronger position in a dispute. It gives the project a better chance to reach completion with clear decisions, controlled risk, and fewer surprises.
