Design and build or traditional procurement: how to buy a building in Oman
One contract or two? The procurement route decides how much control you keep, how fast you start and where the risk sits. A plain comparison for owners in Oman.
The two routes compared
| Traditional (design-bid-build) | Design and build | |
|---|---|---|
| Contracts the owner signs | Consultants, then a contractor | One design-and-build contractor |
| Design control | Owner's design team, full control | Contractor's designers, to the owner's brief |
| Price certainty at contract | High: priced against a complete design and bill | Depends on how complete the brief and employer's requirements are |
| Speed to start on site | Slower: design must be complete first | Faster: design and construction overlap |
| Comparability of tenders | High: all bidders price the same documents | Lower: each bidder proposes a different design |
| Who carries design risk | Owner | Contractor |
| Quality control | Independent design team and QS check the contractor | Owner needs an independent monitor to check the contractor's own design |
| Variations | Owner changes priced at bill rates | Any change to the brief is priced by the sole contractor, with little competition |
| Typical Oman use | Villas, hotels, schools, clinics, offices, public buildings | Warehouses, factories, standard housing, fast commercial fit-outs |
What traditional procurement gives you
Control and comparability. Because the design is finished and measured before tender, four contractors price exactly the same building and the owner can see where the prices differ. Quality is checked by a design team that does not work for the contractor. The cost is time: the design stage runs before construction rather than alongside it.
What design and build gives you
Speed and one accountable party. The contractor starts on site while later stages are still being designed, and if something does not work there is nobody else to blame. The cost is control: the contractor's designer works for the contractor, and every detail that is not fixed in the employer's requirements will be resolved in the contractor's favour. The employer's requirements and a strong independent monitor are where the owner's protection sits.
Where the cost consultant fits in each
In the traditional route the cost consultant sets the budget, measures the bill, evaluates the tenders and certifies payments through to the final account. In design and build the role shifts earlier and later: pricing the brief so the owner knows what a fair design-and-build price is, auditing the contractor's proposal and priced schedule before signing, and then monitoring cost, certifying payments and valuing changes to the brief. Both routes need one; only the emphasis moves.
Common questions
- Is design and build cheaper?
- Usually faster, not usually cheaper. The single contractor prices design risk and holds the only pen on changes. A well-run traditional tender on a complete design normally produces the keener price.
- Can I keep my own architect in design and build?
- Yes, for the concept and the employer's requirements. The contractor's team then develops the design, or your architect is novated to the contractor.
- Which route do Oman government projects use?
- Most public building projects are procured traditionally through the Projects, Tenders and Local Content Authority, with design and build used for some industrial and infrastructure work.
- How does OGB help on a design-and-build project?
- We price the brief, audit the contractor's priced proposal before you sign, then monitor cost and certify payments through to the final account.
Sources
- FIDIC — Conditions of Contract for Plant and Design-Build (Yellow Book)
- Projects, Tenders and Local Content Authority — Oman
- RICS — New Rules of Measurement
This guide is general information based on the sources above and our experience in Oman. Rules and fees change; confirm the current position with the relevant authority before acting.
More guides