Construction Procurement Routes Explained: Which Is Best?

Every construction project starts with a decision that shapes everything else that follows: which of the construction procurement routes will the client use to get the building designed, priced and built? Choose traditional design-bid-build and the client gets strong price certainty but a longer programme. Choose design and build and the client gets speed and a single point of responsibility but less day-to-day control over design. Get the choice wrong and even a well-conceived scheme can end up over budget, over programme, or in dispute long before practical completion.

This guide walks through the six procurement routes every UK quantity surveyor and commercial manager needs to understand: traditional procurement, design and build, management contracting, construction management, two-stage tendering and framework agreements. RICS guidance is clear that procurement route selection is fundamentally a question of risk allocation - deciding which party carries design risk, cost risk and programme risk, and at what point in the project each of those risks transfers.

Whether you're advising a client at the outset of a project, preparing for the RICS APC Procurement and Tendering competency, or simply need a plain-English refresher before a client meeting, this article sets out how each route actually works, who carries the risk under each one, and when each route earns its place on a project.

Read on for a full breakdown of each route, a side-by-side comparison table covering risk allocation, speed and cost certainty, a risk-transfer graphic, and a practical checklist for choosing the right route for your next project.

• Traditional (Design-Bid-Build) - the design is completed before tender, giving the highest cost certainty and the most employer control, but the longest overall programme.
• Design and Build - a single contractor takes on both design and construction, giving one point of responsibility and a faster programme, in exchange for less employer control over design detail.
• Management Contracting - a management contractor coordinates a series of trade packages for a fee, allowing an early start and design flexibility, but the final cost isn't fixed until late in the project.
• Construction Management - the employer holds direct contracts with every trade contractor, giving the fastest possible start and maximum flexibility, but the employer carries the most risk.
• Two-Stage Tendering / Early Contractor Involvement (ECI) - a contractor is appointed early to advise on buildability before the price is fixed, balancing collaboration with reasonable cost certainty.
• Framework Agreements - a pre-agreed panel of contractors or consultants is used for a programme of repeat work, speeding up procurement without a fresh tender each time.

The comparison table and risk-transfer graphic further down this article set these six routes side by side across risk allocation, speed and cost certainty, so you can see at a glance which route best matches a given project's priorities.

What Is a Construction Procurement Route (and Why the Choice Matters)?

Procurement strategy vs procurement route

RICS guidance draws a useful distinction between procurement strategy and procurement route. The strategy covers the broader decisions about how the client wants the project team assembled and how the parties relate to one another - for example, whether to prioritise cost, quality, speed or sustainability, and how much risk the client is prepared to hold itself. The procurement route is the practical mechanism that implements that strategy: it determines who is responsible for design, who carries which risks, and how the contract is structured to reflect that allocation. Get the strategy right first, and the route selection becomes a much more straightforward exercise.

The factors that should drive your decision

In practice, five factors tend to dominate the procurement route conversation on any real project. None of them exist in isolation - a client that wants both absolute cost certainty and a six-month programme on a complex scheme is asking for something that no procurement route can fully deliver, and part of the QS's job is helping the client understand that trade-off early.

• Cost certainty required - how important is a fixed, guaranteed price versus flexibility to adjust scope as the design develops?
• Programme urgency - does the client need to start on site as soon as possible, or is there time for a full design to be completed first?
• Design complexity and client design input - does the client (or its architect) need to retain tight control over design decisions, or is a contractor-led design acceptable?
• Client risk appetite and experience - is this an experienced, well-resourced client comfortable managing multiple direct contracts, or a first-time developer who wants risk transferred to a single contractor?
• Market conditions and contractor capacity - in a busy market, some routes attract stronger competition and pricing than others.

With those factors in mind, the rest of this article works through each of the six main routes in turn, covering how each one works in practice, its principal advantages and drawbacks, and the type of project it tends to suit best.

Traditional Procurement (Design-Bid-Build)

How it works

Under traditional procurement, the client first appoints a design team - typically an architect, structural engineer and building services engineer, often led by the quantity surveyor from a cost-planning perspective - to develop the design through to a substantially complete stage. Only once the design (and usually a full bill of quantities or specification) is finished does the project go out to tender, where contractors compete on price to build exactly what has been designed. The successful contractor then constructs the works against that fixed design, typically under a JCT Standard Building Contract or an NEC4 Engineering and Construction Contract with a lump sum or activity schedule pricing option.

RICS guidance describes traditional procurement as the 'least risk' route for the employer, in the sense that there is a high level of certainty about design, cost and duration once the contract is signed, provided the design was genuinely complete at tender stage. That certainty, however, is bought at the cost of programme length: because design must be finished before construction starts, traditional procurement almost always takes longer overall than routes that allow design and construction to overlap.

Advantages and drawbacks

• Strong price and cost certainty once tenders are returned against a complete design
• Client (via its design team) retains full control over design decisions throughout
• Clear, well-understood roles - architect designs, contractor builds, QS costs and administers
• Competitive tendering on a like-for-like basis makes bid comparison straightforward
• Downside: sequential process means a longer overall programme than overlapping routes
• Downside: limited contractor input on buildability until after the design is fixed
• Downside: variations to a fixed-price contract can be a common source of cost overrun and dispute

Design and Build

Single-stage vs two-stage design and build

In design and build, a single contractor is appointed to both design and construct the works described in the employer's brief, most commonly under a JCT Design and Build Contract. This can be run as single-stage design and build, where the contractor tenders a fixed price against a reasonably developed brief, or as two-stage design and build, where the contractor is appointed early on a preliminary basis and works with the employer to develop the design and firm up the price before a second-stage contract sum is agreed. Two-stage design and build has become increasingly common because it captures much of design and build's speed while still giving the employer some influence over design development before the price is locked in.

Novation and single-point responsibility

Design and build is frequently described as giving the employer 'single point responsibility': if something goes wrong, there is one party - the contractor - to hold accountable for both the design and the construction, rather than trying to establish whether a defect originated with the architect or the builder. On many schemes, the employer's own consultants develop a concept design and are then novated to the contractor, who takes over responsibility for developing that design to completion. Industry procurement trends surveys consistently identify design and build as the most commonly used procurement route in the UK market, reflecting how strongly employers value the combination of speed and cost certainty it offers.

Advantages and drawbacks

• Faster overall delivery because design development and construction can overlap
• Single point of responsibility simplifies accountability if defects or delays occur
• Cost certainty from an early lump sum, particularly valuable to funders and investors
• Downside: employer has less day-to-day control over detailed design decisions
• Downside: quality of outcome depends heavily on how precisely the Employer's Requirements are drafted
• Downside: ambiguities in the brief are generally interpreted in the contractor's favour once signed

Management Contracting vs Construction Management

Management contracting

Under management contracting, the design is still carried out by a professional team appointed directly by the employer, much as it would be under traditional procurement. The employer separately appoints a management contractor whose job is to manage and coordinate the construction works - but the management contractor does not carry out any of the physical work itself. Instead, it lets and manages a series of works packages with specialist subcontractors, and is paid an agreed management fee plus reimbursement of the costs it incurs running those packages. Because packages can be let and started before the full design is finished, management contracting allows an earlier start on site than traditional procurement, while still keeping design and cost input close to the employer.

Construction management

Construction management takes that logic a step further. Rather than the management contractor holding the trade contracts, the employer contracts directly with each trade contractor, and appoints a construction manager purely as an agent, for a fee, to plan, coordinate and administer those packages on the employer's behalf. Because the construction manager is not at financial risk on the trade packages, and the employer holds every contract directly, this route places the greatest cost and programme risk squarely with the employer - but it also gives the greatest scope for fast-track delivery and design flexibility, since packages can be designed, tendered and started in a rolling sequence rather than all at once.

Where the two routes differ

• Contractual structure - management contractor holds the trade contracts; construction manager does not, the employer does
• Risk position - the employer carries materially more cost and programme risk under construction management than under management contracting
• Suitability - both suit complex, fast-track or phased projects, but construction management is generally reserved for experienced, well-resourced clients able to manage that additional risk
• Fee basis - both roles are typically paid a management fee rather than taking a margin on the works themselves

Two-Stage Tendering, Early Contractor Involvement and Frameworks

Two-stage tendering and ECI

Two-stage tendering appoints a contractor early, at the first stage, based on an initial competitive tender against outline design information, preliminaries, overheads, profit and key rates rather than a full firm price. In the second stage, that same contractor works openly with the employer and the design team - often under a pre-construction services agreement - to advise on buildability, refine the design, procure work packages and develop the detailed price on an open-book basis, before a contract sum is finally agreed and the main construction contract is executed. This structure gives the employer earlier access to the contractor's practical experience of programming, sequencing and buildability than a single-stage tender would allow, while still working towards a fixed price before construction gets fully underway. According to the RIBA Construction Contracts and Law Report, over a third of respondents (37%) had used two-stage procurement on a project in the preceding 12 months, and it has become particularly prevalent on complex or refurbishment-heavy schemes where early contractor input materially reduces risk.

Framework agreements

A framework agreement is not itself a procurement route in the same sense as the others - it is a mechanism for appointing contractors, consultants or specialists from a pre-vetted panel for a programme of repeat work, without running a fresh full tender for every individual project. Once a framework is in place (commonly used by public sector bodies, housing associations and repeat private developers), individual projects can be allocated to framework members via a lighter-touch mini-competition or direct call-off, and the underlying works are then usually delivered under whichever procurement route the framework specifies - frequently two-stage or design and build. Frameworks trade a small amount of open-market competition on each individual project for significant time savings and continuity of relationships across a programme of work.

• Two-stage tendering suits complex or refurbishment projects where buildability advice materially reduces risk before pricing
• ECI is often used interchangeably with two-stage tendering, though ECI can also apply within design and build or NEC Option C/E contracts
• Frameworks reduce procurement lead time significantly across a programme of similar projects
• Both approaches depend heavily on trust and open-book cost transparency between employer and contractor to work well

Comparing the Routes: Risk, Speed and Cost Certainty

With all six routes explained individually, it helps to see them side by side. The table below summarises where risk sits, how quickly each route typically gets a project on site, and how much cost certainty the employer can expect at the point construction begins.

The pattern running through this comparison is a straightforward trade-off: routes that give the employer the fastest start and the greatest design flexibility (construction management, management contracting) also require the employer to carry the most cost and programme risk, because the final price isn't locked in until much later in the project. Routes that give the employer the highest cost certainty (traditional procurement) require the design to be completed first, which lengthens the programme. Design and build, two-stage tendering and framework-based routes sit somewhere between these two extremes, which is precisely why they have become so widely used across the UK market.

How to Choose the Right Procurement Route for Your Project

Questions to ask before choosing

There is no formula that spits out the 'correct' procurement route - but working through a structured set of questions early, ideally before the design team is even appointed, will narrow the field quickly and give the client a defensible rationale for the route eventually selected.

• How much cost certainty does the client need, and at what stage does that certainty need to be locked in - at tender, or can it wait until later in the design process?
• How urgent is the programme? Is an earlier start on site worth accepting less cost certainty in exchange?
• How much design control does the client (or its funder, or planning conditions) require the employer's own team to retain?
• How experienced is the client at managing construction risk directly - does it have an in-house team capable of running a construction management project, or does it need risk transferred to a single contractor?
• What does the current contractor market look like - is there strong competition and capacity for the routes under consideration?
• Is this a one-off project or part of a repeat programme where a framework agreement could save time on future schemes?

In practice, many UK QSs find that a small number of routes dominate real-world project selection: traditional procurement for well-defined, design-led schemes (particularly in the public and heritage sectors); design and build for time-critical commercial and residential developments; and two-stage tendering for complex or refurbishment-heavy projects where early contractor input reduces risk before the price is fixed. Management contracting and construction management remain important but more specialist tools, generally reserved for large, fast-track or highly complex projects delivered by experienced clients with the resources to manage the additional risk those routes carry.

Whichever route is chosen, the decision should be documented and justified against the client's actual priorities, not defaulted to out of habit. A route that worked well on the last project won't automatically be right for the next one if the risk appetite, programme or design complexity has changed.

Frequently Asked Questions

What are the main construction procurement routes in the UK?

The main routes are traditional procurement (Design-Bid-Build), design and build, management contracting, construction management, two-stage tendering (including early contractor involvement) and framework agreements. Each allocates design, cost and programme risk between employer and contractor differently.

Which procurement route gives the most cost certainty?

Traditional procurement generally gives the highest cost certainty, because tenders are returned against a substantially complete design. RICS guidance describes it as the 'least risk' route for the employer once the contract is signed, though it typically takes longer overall than routes where design and construction overlap.

Is design and build faster than traditional procurement?

Yes, in most cases. Because the contractor can begin construction work and detailed design development in parallel rather than waiting for a fully complete design before tender, design and build typically delivers a shorter overall programme than traditional Design-Bid-Build procurement.

What is the difference between management contracting and construction management?

Under management contracting, the management contractor holds the trade contracts and manages subcontractors for a fee. Under construction management, the employer holds the trade contracts directly and the construction manager acts purely as a fee-paid agent, which places significantly more cost and programme risk on the employer.

When should two-stage tendering be used instead of a single-stage tender?

Two-stage tendering suits complex, refurbishment-heavy or fast-track projects where early contractor input on buildability, sequencing and cost planning reduces risk before the price is fixed. It appoints a contractor earlier than a single-stage tender, then develops the price collaboratively on an open-book basis.

What is a construction procurement strategy, and how is it different from a procurement route?

A procurement strategy covers the broader decisions about how a client wants its project team assembled and how much risk it is prepared to hold itself. The procurement route is the practical mechanism - such as traditional, design and build or construction management - that implements that strategy on a specific project.

How do framework agreements fit into procurement route selection?

A framework agreement is a mechanism for appointing pre-vetted contractors or consultants for a programme of repeat work without a fresh full tender each time. Individual projects delivered through a framework are still typically run under an underlying procurement route, most commonly design and build or two-stage tendering.

Final Thoughts

Choosing between construction procurement routes ultimately comes down to a single question repeated at every decision point: who should carry which risk, and at what point in the project should that risk transfer? Traditional procurement transfers risk latest but most completely, once a fixed price is agreed against a finished design. Construction management transfers almost no risk away from the employer at all, in exchange for the fastest possible start and the greatest flexibility. Design and build, two-stage tendering and framework agreements each occupy their own position along that spectrum, which is exactly why they have become the default choices for so much of the UK's commercial and residential construction output.

For quantity surveyors and commercial managers, the value in understanding these routes deeply isn't academic - it directly shapes the advice given to clients at the earliest, most consequential stage of a project, long before a design is finalised or a contract signed. Getting that advice right, backed by a clear-eyed comparison of risk, speed and cost certainty, is one of the most valuable contributions a QS can make to a project's eventual success.

Want the full picture? Want to go deeper on procurement and contract selection?

Read our companion guides on JCT Design and Build Contract Explained and NEC vs JCT Contracts Explained to see how your chosen procurement route translates into the standard form contract that will actually run the project.