Types of Project Delivery Methods in Construction — and How to Choose the Right One
A practical guide to construction project delivery methods — Design–Bid–Build, Design & Build, EPC, Construction Management, Management Contracting, ECI, IPD, Alliancing and PPP. Who carries which risk, which projects each method suits, and real examples from Sydney to Heathrow to Auckland.
Project names, parties and commercially sensitive figures referenced in this article have been anonymised or generalised. Examples reflect real situations encountered across multiple projects; they are not attributed to any specific client, contractor or contract.
Two owners can build the same hospital, with the same design team and the same budget, and end up with completely different projects.
One tenders a finished design, signs a lump sum, and spends the next three years administering variations. The other brings the builder in at concept, shares the cost risk, and spends those years solving problems in the same room. Same building. Different money, different programme, different relationships — and very often a different outcome.
The difference is the project delivery method. It is usually decided early, often by habit, and it quietly determines who designs, who carries which risk, how fast you can start, and how much certainty you have when you sign.
This guide sets out the delivery methods you will meet on real projects, what each one allocates to the owner and the contractor, and which types of project each one genuinely suits.
A note on terms: people use "delivery method", "procurement route" and "contract type" interchangeably. They are related but not the same. The delivery method decides who designs and who builds, and in what sequence. The contract form (FIDIC, NZS 3910, NEC4, JCT, AIA) documents it. The pricing mechanism (lump sum, remeasurement, cost-plus, target cost, GMP) decides how the money moves. You can combine them in many ways — which is exactly why the choice deserves more thought than it usually gets. Practice varies by jurisdiction; this is practical guidance, not legal advice.
The One Idea That Explains Every Method
Every delivery method is a position on a spectrum between two things an owner wants and can never fully have at the same time: control and certainty.
- Keep control of the design and the trade packages, and you keep the risk that comes with them.
- Transfer the risk to a contractor, and you pay a premium for it — and give up control over how the problem gets solved.
- Share the risk, and you need a relationship, a governance structure and an owner team mature enough to run it.
There is no method with low cost, high certainty, fast start and full owner control. Anyone selling you one is selling a contract, not a project.
1. Design–Bid–Build (Traditional)
How it works: the owner appoints a design team, completes the design, tenders it, and awards a construction contract to the successful bidder — usually a lump sum or a remeasured bill of quantities. The contractor builds what is drawn.
Typical forms: FIDIC Red Book, NZS 3910, JCT Standard Building Contract, AIA A101.
Owner carries: design errors and omissions, design coordination, late information, and most unforeseen ground conditions. Every gap in the drawings becomes a variation.
Contractor carries: price, productivity, method, programme and workmanship — for the work as drawn.
Suits: schools, council buildings, standard commercial and residential work, and public projects where transparent competitive tendering is a requirement.
Watch: the method only delivers price certainty if the design is genuinely complete at tender. Tendering a 60% design as if it were 100% converts your lump sum into a remeasurement contract with worse paperwork.
Real example: the Sydney Opera House is the classic cautionary tale. Construction began in 1959 before the design — particularly the roof shells — had been resolved. The original estimate of around A$7 million became a final cost of roughly A$102 million, and completion slipped from 1963 to 1973. It is a magnificent building. It is also what happens when you start building a design that doesn't yet exist.
2. Design & Build (and EPC / Turnkey)
How it works: the owner prepares a set of requirements — the Employer's Requirements or Principal's Requirements — and a single contractor takes responsibility for both design and construction under one contract.
Typical forms: FIDIC Yellow Book, NZS 3916, JCT Design and Build, NEC4 with contractor design.
Owner carries: the adequacy of its own requirements, site information it provides, and the risk of changing its mind. Once awarded, changes are expensive.
Contractor carries: design development, design coordination, buildability, price and programme. One point of responsibility — which is the whole point.
Suits: warehouses, logistics centres, industrial buildings, repeatable residential product, car parks, and any project where performance can be specified more easily than it can be drawn.
Variants you will meet:
- Novated Design & Build — common in Australia and New Zealand. The owner develops the design to a set stage, then novates the design consultants to the contractor. The owner gets the design it wanted; the contractor inherits designers it didn't choose. Scope gaps at the novation point are a frequent source of dispute.
- EPC / Turnkey — the contractor delivers a complete, operating facility, typically under FIDIC Silver Book. Common for power plants, desalination, and oil and gas facilities across the Gulf. Risk transfer is heavy and deliberate — including much of the ground and design-requirement risk — so tender prices carry significant risk premiums.
Watch: poorly written Employer's Requirements. If the owner says "office building, Grade A" without defining it, the contractor will deliver the cheapest thing that can honestly be called Grade A.
3. Construction Management (CM at-fee / Agency CM)
How it works: the owner engages a construction manager for a fee to manage the construction process — programme, packaging, procurement, coordination, site management. The owner signs each trade contract directly.
Typical forms: JCT Construction Management suite, AIA C132, bespoke CM appointments.
Owner carries: almost everything — cost overruns, trade contractor default, interface gaps between packages, and delay. The owner holds dozens of contracts.
Construction manager carries: its own professional performance. It is an adviser and manager, not a risk-taker.
Suits: fast-track commercial projects, complex fit-outs, and experienced, well-resourced owners who want maximum control and visibility and can absorb the risk.
Watch: an owner without a strong in-house commercial team. Twenty-five trade contracts means twenty-five sets of claims, and the construction manager is not the one paying them.
4. Management Contracting
How it works: similar in spirit to Construction Management, with one crucial difference — the management contractor holds the trade (works) contracts, not the owner. It is paid a fee plus the cost of the packages.
Typical forms: JCT Management Building Contract, NEC4 ECC Option F.
Owner carries: most of the cost risk. The management contractor is usually only liable for trade contractor defaults to the extent it can recover from them — so the owner still funds most of the overrun.
Management contractor carries: management performance, coordination and procurement, with limited financial exposure.
Suits: large, complex, fast-track building projects where design will develop alongside construction and the owner wants one contractual counterparty on site.
Watch: owners who believe a single contract means risk transfer. It doesn't. Management contracting was popular in UK city-centre development in the 1980s and has faded in part because owners discovered how much risk had stayed with them.
5. Early Contractor Involvement, Two-Stage and CM at Risk
How it works: the contractor is appointed early — at concept or developed design — on a pre-construction services agreement. It advises on buildability, programme, cost and packaging, and prices work packages as the design matures. At an agreed point, the parties convert to a construction contract, often lump sum or with a Guaranteed Maximum Price (GMP). In the US this is known as Construction Manager at Risk (CMAR).
Owner carries: design risk during development, and the risk that the stage two price is higher than hoped — with reduced competitive tension to bring it down.
Contractor carries: under a GMP, cost overruns above the ceiling. Before conversion, very little.
Suits: complex buildings with a hard programme — hospitals, laboratories, education campuses, heritage refurbishments — and markets where contractors are reluctant to price unresolved risk.
Watch: the conversion point. If stage two negotiations fail, the owner has spent months building a relationship it may need to walk away from. Always keep a credible fallback.
6. Integrated Project Delivery (IPD)
How it works: the owner, designer and builder — and often key trades — sign a single multi-party agreement. Profit is placed at risk and tied to shared project outcomes. Decisions are made jointly, usually by consensus, and liability between the parties is largely waived.
Typical forms: AIA C191, ConsensusDocs 300, bespoke integrated forms of agreement.
Owner carries: actual cost of the work (reimbursed), and a large share of the governance effort.
Team carries: its profit, which moves up or down with target cost and quality outcomes.
Suits: highly complex, technology-heavy buildings where design and construction must be solved together — healthcare in particular — and owners committed to lean methods, co-location and BIM.
Real example: Sutter Health in California became one of the best-known early adopters, using an integrated form of agreement on its hospital programme and embedding Lean practices such as Target Value Design and the Last Planner System.
Watch: IPD is a culture before it is a contract. Signing an IPD agreement with a team that still behaves transactionally gives you the costs of collaboration without the benefits.
7. Alliance Contracting
How it works: owner and non-owner participants (designers, contractors) form an alliance under one agreement. Work is paid on actual cost, plus a fee for corporate overhead and profit, plus a painshare / gainshare mechanism against a Target Outturn Cost. The defining features are "no blame, no dispute" and unanimous decision-making by an alliance leadership team.
Typical forms: bespoke alliance agreements (common in Australia and New Zealand), NEC4 Alliance Contract.
Owner carries: the actual cost of the project — ultimately, the owner pays for what it costs. The gainshare model aligns incentives; it does not transfer risk.
Non-owner participants carry: their fee and profit, which is at risk against the target.
Suits: large infrastructure with genuinely uncertain scope or risk that cannot be sensibly priced — tunnels, rail, water networks, and post-disaster recovery.
Real examples:
- Auckland's Waterview Connection — twin motorway tunnels delivered by the Well-Connected Alliance, opened in 2017. Tunnelling risk under a live urban area is exactly the kind of risk no contractor can price cheaply.
- SCIRT (Stronger Christchurch Infrastructure Rebuild Team) — an alliance of public owners and five contractors that rebuilt Christchurch's roads, water and wastewater networks after the 2011 earthquakes, where the scope was unknown at the start and had to be discovered as work proceeded.
Watch: alliances need a capable owner at the leadership table and a robust Target Outturn Cost. A soft target turns gainshare into a bonus for ordinary performance.
8. Other Methods You Will Meet
| Method | In one line | Typical use |
|---|---|---|
| PPP / PFI / BOT | A private consortium finances, designs, builds and often operates the asset for 20–30 years, paid through availability payments or user charges | Roads, hospitals, prisons, schools |
| Design-Build-Operate-Maintain (DBOM) | D&B plus long-term operation, without private finance | Water and wastewater treatment |
| Progressive Design-Build | Builder appointed early; design and price develop together before a lump sum or GMP is agreed | Complex water and transport projects (US) |
| Framework agreements | A panel of pre-selected contractors call-off work over several years | Programmes of repeat work, maintenance |
| Partnering | A collaborative overlay on another method, often under PPC2000 or NEC4 Option X12 | Long-term client–contractor relationships |
| Target cost | A pricing mechanism rather than a method — actual cost with pain/gain against a target (NEC4 Options C and D) | Uncertain scope with shared risk |
Real example — PPP: Heathrow Terminal 5 is often cited as a case where the client deliberately kept the risk. BAA's T5 Agreement held the main risks with the client and paid suppliers on a cost-reimbursable basis with incentives, so the team could focus on solving problems rather than protecting positions. Construction was delivered broadly to time and budget in 2008 — although the opening-day baggage system problems are a reminder that commissioning and operational readiness are part of delivery too. By contrast, New Zealand's Transmission Gully motorway PPP opened in 2022 well behind its original programme, with substantial additional costs and settlements — a reminder that a long-term PPP moves risk on paper but cannot move it out of the public eye.
The Comparison at a Glance
| Method | Design by | Price certainty at award | Speed to start | Owner risk | Contractor risk | Owner effort |
|---|---|---|---|---|---|---|
| Design–Bid–Build | Owner's consultants | High (if design complete) | Slow | Medium | Medium | Medium |
| Design & Build | Contractor | High | Medium | Low–Medium | High | Low–Medium |
| EPC / Turnkey | Contractor | Very high | Medium | Low | Very high | Low |
| Construction Management | Owner's consultants | Low | Fast | Very high | Low | Very high |
| Management Contracting | Owner's consultants | Low | Fast | High | Low–Medium | High |
| ECI / Two-stage / CMAR | Owner's consultants, with builder input | Medium (at GMP) | Medium–Fast | Medium | Medium | Medium–High |
| IPD | Integrated team | Medium (target) | Medium | Shared | Shared (profit at risk) | High |
| Alliance | Integrated team | Low–Medium (target) | Medium | High (pays actual cost) | Fee at risk | Very high |
| PPP | Consortium | High (long-term) | Slow | Low (on paper) | High | High (procurement) |
Who Carries Which Risk
| Risk | DBB | D&B | EPC | CM | MC | ECI/GMP | IPD | Alliance |
|---|---|---|---|---|---|---|---|---|
| Design errors | Owner | Contractor | Contractor | Owner | Owner | Owner (pre-GMP) | Shared | Shared |
| Ground conditions | Owner (usually) | Negotiated | Contractor (often) | Owner | Owner | Negotiated | Shared | Shared |
| Price escalation | Contractor (lump sum) | Contractor | Contractor | Owner | Owner | Contractor (post-GMP) | Shared | Shared |
| Trade contractor default | Contractor | Contractor | Contractor | Owner | Mostly owner | Contractor | Shared | Shared |
| Package interfaces | Contractor | Contractor | Contractor | Owner | Contractor (limited) | Contractor | Shared | Shared |
| Owner scope change | Owner | Owner (at a premium) | Owner (at a premium) | Owner | Owner | Owner | Owner | Owner |
The last row is the one owners forget. No delivery method transfers the cost of changing your mind. Some just make it more expensive.
How to Choose: Six Questions
Before choosing a method, answer these honestly — ideally in a documented procurement strategy that the whole governance team signs.
- How complete is the design? A complete design points to Design–Bid–Build. A performance brief points to Design & Build. A concept on a napkin points to ECI, IPD or alliancing.
- How much price certainty do you need at approval? Funders and boards that need a fixed number push you toward DBB, D&B or EPC — and away from methods that reimburse actual cost.
- How hard is the deadline? Fast-track programmes favour CM, management contracting or ECI, where design and construction overlap.
- How capable is your own team? CM, IPD and alliancing demand a strong, present, decisive owner. If you can't staff it, don't choose it.
- How uncertain is the risk? If nobody can price the risk sensibly — tunnelling, brownfield, post-disaster — forcing a lump sum simply buys a large contingency and a future claim.
- What will the market accept? In a busy market, contractors decline heavy risk transfer or price it punitively. A method that attracts two bidders instead of six has already cost you.
Matching Method to Project
| Project type | Usually suits | Why |
|---|---|---|
| School, council building, standard housing | Design–Bid–Build | Mature design, public accountability, competitive price |
| Warehouse, logistics, industrial shed | Design & Build | Performance is easy to specify; contractor innovation saves cost |
| Power, desalination, process plant | EPC / Turnkey | Single-point responsibility for a performing facility |
| Fast-track commercial fit-out | Construction Management | Speed and owner control; experienced owner |
| Hospital, laboratory, complex campus | ECI / Two-stage or IPD | Design and buildability must be solved together |
| Tunnels, rail, uncertain civil works | Alliance | Risk too uncertain to price; collaboration reduces outturn |
| Toll road, social infrastructure with long life | PPP | Whole-of-life cost and private finance |
| Programme of repeat projects | Framework / Partnering | Continuity, learning and lower tendering cost |
Common Mistakes
| Mistake | Do this instead |
|---|---|
| Choosing the method your organisation always uses | Write a procurement strategy for each project and test it against the six questions |
| Tendering an incomplete design as a lump sum | Finish the design, or choose a method that shares design development risk |
| Vague Employer's Requirements under D&B | Specify performance, standards, finishes and acceptance tests clearly |
| Assuming a single contract means risk transfer | Read who pays for trade default and interfaces — especially under management contracting |
| Choosing IPD or alliancing without the people to run it | Resource the owner's team before you sign, not after |
| Heavy risk transfer in a hot market | Test market appetite early; a two-bidder tender has already failed |
| Mixing collaborative language with adversarial clauses | Align the contract terms, incentives and behaviours with the method you chose |
| Ignoring the delivery method in the risk register | Map each major risk to its owner under the chosen method and track it |
Conclusion: Choose the Method, Then Live It
The delivery method is not an administrative box ticked at procurement. It is the single biggest decision an owner makes about risk — bigger than the contract form, and often bigger than the price.
Design–Bid–Build rewards a finished design. Design & Build rewards a clear brief. Construction Management rewards a strong owner. IPD and alliancing reward teams willing to share both problems and money. PPP rewards long-term thinking and punishes weak contract management for decades.
Choose deliberately, document why, and then run the project the way the method assumes you will. A collaborative contract administered adversarially, or a lump sum managed as if the design were still open, gives you the worst of both worlds.
Get the method right, and the contract administration, the bonds and the risk register all have a clear allocation to work from. Get it wrong, and every one of them will spend the project arguing about it.
Take It Further with Triangle PM
If you are setting up procurement on your next project, Triangle PM has the tools ready to go:
- Construction Contract Administration Handbook — FIDIC and NZS 3910 contract administration, clause by clause, with ready-to-use registers, forms and checklists.
- Contract & Procurement Templates — prequalification, scope matrix, RFI and submittal registers in editable Excel and Word.
- The Risk Register Blueprint — map every major risk to the party your delivery method says should carry it.
- Full Library Bundle — all 31 production templates across 16 disciplines, FIDIC and NZS 3910 aligned.
- Podcast Episode 02: Contract Types and Delivery Methods — the short-form audio version of this topic.
👉 Explore the Triangle PM resource library and set up your next project on the right footing.
Ahmed Albasry is a Project Manager, Construction Manager and Building Surveyor with over 20 years of construction experience across UAE and New Zealand, and the creator of the Construction Management Excellence (CME™) Framework. Delivery methods, contract forms and risk allocation vary by jurisdiction and by the specific amendments to each contract — this article is general guidance only. Always obtain professional legal and commercial advice before selecting a procurement strategy or executing a contract.
Construction project manager (PMP, MCIOB) with 20+ years on infrastructure, commercial and industrial builds across the GCC and NZ. Writes about the controls, contracts and field practices that actually move projects.
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