Greystone construction knowledge
Design and build compared with a traditional tender route.
A practical guide to how two common procurement routes organise design, pricing, responsibility and change for a Phuket construction project.
Neither route is automatically better. The right choice depends on how developed the design is, how responsibility should be organised and when the client needs contractor input or competitive tender comparison.
Choose the delivery route before asking for a final construction price. Otherwise different bidders may be pricing different design duties, risks and assumptions.
Design and build
Bring design coordination and construction responsibility closer together.
Under a design-and-build route, one delivery team takes responsibility for completing or coordinating the design and carrying out the construction. The client still needs a clear brief, quality expectations and approval points.
Early buildability input
The contractor can contribute to systems, sequencing, procurement and practical design decisions before every detail is fixed.
Coordinated responsibility
Design development and construction interfaces sit within a more integrated delivery structure.
Clear client brief
Performance, appearance, materials, exclusions and design approvals must be defined so quality is not left to assumption.
Traditional tender
Develop the design first, then ask contractors to price the same documents.
Under a traditional route, the client’s appointed consultants develop the design and tender information before contractors submit bids. The consultant team normally retains design responsibility while the selected contractor builds the documented work.
- Comparable tender basis: bidders should receive the same drawings, specifications and commercial requirements.
- Independent design control: the client’s consultants remain responsible for the design and can administer the construction contract.
- Mature documents: meaningful comparison depends on coordinated tender information with limited unresolved scope.
- Managed change: later design changes, omissions or client revisions need a clear valuation and approval process.
Route comparison
Compare the responsibilities—not only the headline price.
Exact contractual arrangements vary. This comparison identifies the questions that should be resolved for either route before appointment.
- 01
Design responsibility
Design and build: coordinated within the delivery team. Traditional: retained by the client’s appointed design consultants.
- 02
Pricing point
Design and build: can develop in stages as design is coordinated. Traditional: tender normally follows a developed document package.
- 03
Client design control
Design and build: exercised through the brief, standards and approval gates. Traditional: exercised directly through the client’s consultant team.
- 04
Coordination
Design and build: design and construction interfaces are integrated. Traditional: consultants coordinate the tender design and the contractor coordinates construction delivery.
- 05
Change handling
Both routes need written scope, authority and valuation rules. Unclear late changes can affect cost and programme under either structure.
- 06
Client decisions
Both routes require timely approvals. The decision schedule and the person authorised to approve design, scope and cost should be explicit.
Choosing a route
Match the route to the project’s actual starting point.
The useful question is not which label sounds preferable. It is which structure fits the design information, client resources, risk allocation and decisions required for this project.
How mature is the design?
Concept intent may benefit from early contractor input. A coordinated consultant package may support a more conventional tender.
Who should control design?
Decide whether the client wants independent consultants throughout or a single team coordinating design development and construction.
What must bidders compare?
Confirm the common scope, quality level, exclusions, allowances and commercial conditions before comparing prices.
Who can make decisions?
Identify the client representative, approval gates and response times needed to keep design and construction moving.
See coordinated delivery in real projects.
These Greystone project stories show different design-and-build applications across villa, estate and commercial work.
Villas Aelita
A recorded Phuket villa project connecting design decisions with construction delivery.
Adina Villas
A coordinated scope covering infrastructure, villas, pools and finishes across an estate.
Factory Design & Build
A recorded commercial building system linking component design, production and site assembly.
A practical next step
Choose the route before asking for a final price.
Greystone can review the current design information, intended responsibilities and project priorities, then identify a suitable next step for briefing, coordination or tender preparation.
