Day Rate vs Price Work: Which Is Right for Your AC Project?

One of the most common questions we get from contractors and project managers is whether they should be engaging AC labour on a day-rate or price-work basis. The honest answer is that both models have their place, and the right choice depends on the nature of your project, your programme certainty, and how well-defined the scope of work is.

Day-rate labour is straightforward. You pay a fixed daily or hourly rate for an engineer's time, and they work on whatever you direct them to do that day. The advantage is flexibility — if the programme shifts, priorities change, or additional work emerges, the engineer adapts without renegotiation. The disadvantage is uncertainty. If the work takes longer than expected, your cost increases proportionally. There is no incentive for the engineer to work faster.

Price work — also known as lump sum or fixed price — is the opposite. You agree a price for a defined scope of work before it starts. If the engineer completes it faster, they profit. If it takes longer, they absorb the extra time. The advantage for the client is cost certainty. The disadvantage is scope rigidity. If the scope changes after the price is agreed, you are into variation territory, which can get complicated.

The right choice depends primarily on programme certainty and scope definition. If you have detailed drawings, clear specifications, and a realistic programme, price work is usually the better choice. The contractor can plan efficiently, the client gets cost certainty, and everyone knows what success looks like. We use price work for the majority of our installation contracts because it aligns incentives — we are motivated to finish efficiently, and the client knows exactly what they are paying.

Day rate is better when the scope is uncertain or the programme is volatile. Maintenance work, remedial work, and second-fix labour on complex projects where the programme is driven by other trades often suit day rate better. In these situations, trying to agree a price upfront leads to either inflated contingency pricing or disputes when scope inevitably changes.

At Aboveboard Group, we offer both models. For installation contracts with clear drawings and specifications, we price the work. For labour supply on contractor sites where flexibility is more important than certainty, we supply day-rate engineers. In some cases, we use a hybrid — a price for the main scope with day-rate provisions for defined variation types.

The most important thing, regardless of the model, is clarity at the start. Agree exactly what is included, how variations will be handled, and what the programme looks like. The disputes we see are almost always the result of ambiguity at the outset, not the choice of pricing model. If you are not sure which model suits your project, give us a call and we will talk it through honestly.