2Nigeria’s construction industry continues to expand as demand for infrastructure, commercial buildings, and residential developments grows. However, many projects still face delays, budget overruns, and coordination problems between designers and contractors. Studies in construction project delivery show that the design and build procurement method can significantly reduce project timelines and improve collaboration when compared with traditional procurement models, where design and construction teams operate separately. Research published by the Designing Buildings Construction Wiki highlights that integrated design-build delivery improves communication and helps minimize costly variations during construction. Stronger coordination means fewer disputes, faster decision-making, and better control of project costs, which remain common pain points for developers across Nigeria’s construction sector.
Project owners often struggle when multiple contractors, architects, and consultants operate independently without a unified project strategy. Miscommunication between design teams and builders can lead to design errors discovered only during construction. Unexpected changes, budget increases, and missed deadlines can quickly disrupt even well-planned projects. Developers also face accountability challenges when responsibility for design and construction is divided among several contractors. Efficient project delivery requires a structured system where design expertise and construction execution operate together under one coordinated team.
This guide explains the design and build procurement method, how it works, and why it has become a preferred project delivery model for many modern infrastructure and building developments. You will discover how integrated procurement simplifies project management, improves efficiency, and reduces risk across the construction lifecycle. The page also highlights how experienced engineering firms like us at Dutum Company Limited deliver reliable design-build solutions that help clients move projects from concept to completion with confidence.
Also See: Best Design and Build Construction Company in Nigeria
What Is the Design and Build Procurement Method?
The design and build procurement method is a project delivery approach where a single contractor handles both the design and construction of a project under one contract. A client signs one agreement with a design-build contractor who manages architects, engineers, and construction teams to deliver the project from concept to completion. This structure creates a single point of responsibility, meaning the contractor is accountable for both the building design and the execution of the works.
Traditional procurement works differently. Separate consultants such as architects, engineers, and quantity surveyors complete the design first, after which a contractor is hired to build the project. Design and build simplifies this process since the same company oversees design decisions, budgeting, and construction delivery.
Developers often prefer this approach because it can reduce project delays and improve cost control. Industry research from Rider Levett Bucknall (RLB) indicates that design and build has become one of the most widely used procurement routes in construction globally.
In Nigeria, construction projects using the design and build approach must still comply with national building regulations and professional standards. Key regulatory bodies include:
- Council for the Regulation of Engineering in Nigeria (COREN) – regulates engineering practice and licensing.
- Nigerian Institute of Architects (NIA) – sets professional standards for architects.
- Lagos State Building Control Agency (LASBCA) – oversees building approvals, compliance, and safety in Lagos.
- Standards Organisation of Nigeria (SON) – Ensures building materials and construction products meet national quality standards.
Companies experienced in design-build delivery, such as us at Dutum Construction Company, integrate design coordination, project management, and construction expertise to simplify the process for clients while ensuring regulatory compliance.
How the Design and Build Procurement Method Works
The design and build procurement method follows a structured process where the client communicates project needs, and the contractor develops the design and construction plan to meet those requirements.
#1. Employer’s Requirements
Employer’s requirements describe what the client expects from the project. This document guides contractors when preparing their proposals.
Typical elements include:
- Project scope and functional requirements
- Design preferences or concept ideas
- Budget expectations
- Project timeline and delivery targets
- Compliance with building regulations and safety standards
Clear requirements reduce misunderstandings and help contractors provide accurate pricing and design solutions. Nigerian projects must also comply with relevant development control regulations and approvals issued by agencies such as Federal Ministry of Housing and Urban Development.
#2. Contractor’s Proposals
Contractors respond with detailed proposals explaining how the project will be delivered. A proposal usually includes:
- Architectural and engineering design concept
- Construction methodology and scheduling
- Cost estimate for project delivery
- Materials and technology to be used
- Risk management and compliance strategy
Large design-build contractors may use in-house designers or collaborate with registered consultants approved by regulatory bodies such as COREN or NIA.
#3. Contract Agreement
Once the client selects a proposal, both parties sign a design-and-build contract. The contract defines responsibilities, project scope, and payment terms.
Common contract features include:
- Lump sum or fixed price arrangement
- Defined construction timeline
- Design development responsibilities
- Performance and quality standards
- Risk allocation between client and contractor
Compliance with Nigerian procurement and building regulations is required, especially for public sector projects governed under the Public Procurement Act 2007.
Types of Design and Build Procurement Method
Construction clients adopt different variations of the design and build procurement method depending on project complexity, time constraints, and design maturity.
#1. Single-Stage Design and Build
Single-stage design and build involves appointing a contractor through a competitive tender where the contractor takes responsibility for completing both the design and construction under one contract.
This approach works best when:
- Project requirements are already well defined
- Design information is sufficiently developed
- The client wants a clear price early in the process
Key features include:
- One tender process
- Contractor responsible for completing the design
- Faster transition from design to construction
Many commercial developments, warehouses, and industrial facilities use this model due to its efficiency.
#2. Two-Stage Design and Build
Two-stage design and build allows the contractor to participate earlier in the project development process.
The process normally follows these steps:
Stage One
- Contractor selected based on experience, capability, and preliminary pricing.
- Design development begins collaboratively with the project team.
Stage Two
- Final project cost is negotiated once design details become clearer.
- Construction begins after agreement on price and scope.
This approach is suitable for:
- Large or technically complex projects
- Developments requiring early contractor expertise
- Projects where design innovation is important
Early collaboration between engineers, architects, and builders often leads to better constructability and cost efficiency.
When to Use the Design and Build Procurement Method
The design and build procurement method works best when a project requires speed, coordination, and clear responsibility. A single contractor manages both design and construction, which helps reduce delays and communication gaps between consultants and builders.
Developers, government agencies, and private organisations often choose this procurement route when project efficiency is a top priority. Construction teams can start certain site activities while the design process continues, allowing projects to move faster.
Situations Where the Design and Build Procurement Method Is Most Effective
- Fast-track construction projects: Early site mobilisation allows design and construction to overlap. This approach shortens the overall project timeline.
- Technically complex developments: Contractor involvement during the design stage improves constructability and engineering coordination.
- Projects requiring strong cost control: A fixed project scope and single contractor reduce unexpected cost escalations.
- Developments requiring a single point of responsibility: One contractor manages the entire process, which simplifies decision-making for the client.
- Projects where the client has limited construction management expertise
The contractor handles coordination between architects, engineers, and subcontractors.
Contracts Used in the Design and Build Procurement Method
Contracts play an important role in the design and build procurement method because they clearly define the responsibilities of the contractor and the client. A well-structured contract outlines project scope, payment terms, performance standards, and risk allocation.
Several contract forms are commonly used internationally in design-build projects.
| Contract Type | Description | Key Advantage |
| JCT Design and Build Contract (JCT DB) | Widely used in building projects where a contractor undertakes both design and construction responsibilities. | Clear allocation of design responsibility. |
| NEC Engineering and Construction Contract (NEC3 / NEC4) | Flexible contract designed for collaboration and effective project management. | Encourages teamwork and proactive risk management. |
| ACA Design and Build Contract | Developed for projects where contractors take full responsibility for design and delivery. | Strong contractual framework for design liability. |
Construction contracts often include the following key elements:
- Scope of work and project specifications
- Design responsibility and professional liability
- Project timeline and completion milestones
- Cost structure and payment schedule
- Risk allocation and dispute resolution process
Transparent contract management also supports compliance with procurement regulations enforced by the Bureau of Public Procurement, the Nigerian agency responsible for monitoring government procurement processes.
Regulations and Compliance in Construction Procurement
Every project delivered through the design and build procurement method must comply with construction regulations, professional standards, and building approval processes. Compliance ensures that buildings are safe, legally approved, and constructed according to national standards.
Key Areas of Regulatory Compliance
- Building design approvals and development permits
- Professional licensing for engineers and architects
- Procurement transparency and contract governance
- Site safety standards and construction inspections
Importance of Regulatory Compliance
Proper regulatory compliance ensures:
- Safe and structurally sound buildings
- Legal development approvals
- Protection of client investments
- Reduced construction disputes and delays
Professional construction firms like us at Dutum Construction Company integrate regulatory compliance into project planning, design coordination, and construction management to ensure projects meet both client expectations and Nigerian building standards.
Frequently Asked Questions About Design and Build Procurement Method
The main difference is structure. In design and build, one contractor handles both design and construction. In traditional procurement, the client appoints separate consultants for design and then hires a contractor to build. Design and build usually delivers faster completion and earlier cost certainty, while traditional procurement gives the client more direct control over design.
The design and build procurement method is suitable for most commercial, residential, and industrial projects. It works best where speed, cost control, and simplified management are important. However, highly complex or design-sensitive projects may require more direct client involvement in the design stage.
The main risk is reduced client control over detailed design decisions after the contract is signed. Any major changes later can increase cost and time. Poorly defined project requirements can also lead to outcomes that do not fully match client expectations.
The design and build procurement method commonly uses contracts such as the JCT Design and Build Contract and NEC4 Engineering and Construction Contract. These agreements define responsibilities, payment terms, and risk allocation. In Nigeria, public projects must also comply with the Public Procurement Act 2007, which ensures transparency and accountability in project delivery.
The contractor is responsible for both design and construction. If design errors occur, the contractor is expected to correct them, provided the client did not change the original requirements after agreement.
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