Choose the model that resolves the project risk.
O'Neill's supports Design & Construct, refurbishment and construct-only delivery. The best pathway is the one that matches design maturity, programme, risk and client objectives.
Explore Design & ConstructStart with design maturity
If the design is fully documented, coordinated and aligned with the client brief, construct-only procurement can create a clear separation between design responsibility and construction delivery.
If the design is still developing, significant buildability questions remain or the programme requires design and procurement to overlap, a Design & Construct pathway may allow construction knowledge to enter the process earlier.
D&C is most useful when coordination still has value
The advantage of D&C is not simply having one contract. Its value comes from connecting design decisions with buildability, cost, procurement and programme while there is still time to influence them.
That can be particularly useful in existing buildings where services, staging, access and retained conditions need to be resolved alongside the design rather than after it is complete.
Construct-only works well when the information is genuinely complete
Construct-only can be efficient when consultants have resolved the design, interfaces are clear and the project can be priced on a stable set of documents. It also preserves a clear client-consultant design relationship.
Problems arise when a project is labelled construct-only but significant design development is still expected during construction without clear responsibility, time or budget allocated to resolve it.
Programme can change the preferred model
A fixed completion date may favour earlier builder involvement if procurement or enabling work needs to begin before every design package is complete. Equally, a generous programme and well-developed documentation may make a traditional tender entirely appropriate.
The delivery model should follow the project conditions, not the other way around.
Accountability still needs clarity
Whichever model is chosen, clients should be clear about who owns design decisions, consultant coordination, approvals, authority interfaces, latent conditions, procurement and changes.
Good delivery is less about the label on the contract and more about whether the responsibilities, information flow and decision-making process are understood before pressure arrives.