
What Does a Structural Engineer Do?
Ever wondered how buildings stay safe during earthquakes or why bridges handle heavy loads? Structural engineers ensure buildings and structures are stable, safe, and meet building codes. This guide explains their role, when to hire them, and how they contribute to construction in New Zealand. If you’re planning a project or renovation, understanding their work can help avoid problems.
31 Mar 2025 | 4 min read
What is a Structural Engineer?
A structural engineer is a professional engineer who focuses on the structural design and integrity of buildings and other structures. They use mathematical calculations to design safe and stable structures. Structural engineers ensure that every construction project, from bridges to commercial buildings, meets safety standards. A structural engineer may also draw detailed construction plans and advise on building materials.
Those pursuing a career as a structural engineer typically hold a Bachelor of Engineering. A Chartered Professional Engineer (CPEng) is an experienced engineer who has been assessed as meeting a quality mark of competence. It shows the engineer can deal with complex engineering problems requiring expert technical knowledge. They must be reassessed at least every six years to maintain their CPEng status.
At Eliot Sinclair, we focus on creating robust and reliable structures that meet high standards of safety and durability. Our team collaborates across disciplines to deliver tailored solutions for each project, whether it's a large commercial building or a small home renovation. By integrating our expertise across our services, we collaborate to ensure a seamless and efficient design process. Want to know more? Have a look at our recent project with Village Health.

Key Responsibilities of Structural Engineers
Structural engineers play a vital role in every phase of construction. They design structures to be functional and stable, advise on suitable materials, and monitor construction to ensure quality. From foundation design to seismic retrofits, their work addresses safety, durability, and regulatory compliance, ensuring every structure meets the highest standards.
Their role may include:
1. Structural Design
- New Construction: Engineers design buildings and other structures, ensuring they are functional and safe.
- Foundation Design: Structural engineers use advanced methods to design stable foundations.
- Materials and Design: Advising on structural steel, concrete, and other building materials.
2. Building Assessments
- Assessing the structural condition of existing building and damage caused by seismic activity and weather events such as flooding.
- Assessing earthquake risks and structural integrity for existing buildings.
- Developing retrofit plans to strengthen structures.
3. Construction Monitoring
- Visiting the construction site to ensure work aligns with construction plans.
- Collaborating with construction companies and project managers to address on-site challenges.
4. Solving Complex Problems
- Identifying potential structural issues and offering solutions to maintain the stability of a building.
- Ensuring the structural support of a new structure meets all safety requirements.
5. Building Renovations
- Evaluating structural work for renovations or extensions.
- Creating plans to modify existing building structures without compromising safety.

When Should You Hire a Structural Engineer?
Structural engineers ensure that building work complies with Clauses B1 and B2 of the New Zealand Building Code. While some low-risk simple design work can be undertaken by suitably experienced architects and architectural designers, structural engineers are typically required for new builds, renovations, or seismic retrofits. Whether designing earthquake-resistant homes or evaluating existing buildings for structural damage, they ensure projects meet safety standards. For tasks like wall removals, foundation repairs, or assessments of earthquake-prone properties, consulting a structural engineer can save time, money, and ensure peace of mind.
You’ll need to hire a structural engineer for tasks such as:
1. Planning New Construction
Structural engineers design and build safe and durable structures. Their expertise ensures your construction project complies with the building codes.
2. Renovating or Modifying a Building
When removing walls or making changes to structural elements, a structural engineer ensures the building remains stable. A great example is our recent project with Hokitika Airport. The original building, constructed over 50 years ago, required a significant extension that greatly increased its size. Our high-performing team of structural engineers delivered a consented structural design that met all requirements, stayed within budget, and was completed within a short timeframe.
3. Earthquake-Prone Properties
Structural engineers ensure your building or structure is ready to withstand seismic activity.
4. Evaluating Structural Integrity
If you notice issues like cracks or uneven floors, a structural engineer analyses the building to recommend the necessary repairs. Evaluating the structural integrity of a structure takes into consideration many factors with the ultimate goal of ensuring it is strong and durable throughout it’s intended lifespan. For a more detailed explanation, read the very insightful description from the University of Auckland.

Structural Engineering Services in New Zealand
In New Zealand, structural engineers address unique challenges such as earthquake preparedness and compliance with the New Zealand Building Code. Services often include seismic assessments, foundation designs, and retrofitting for older buildings. Collaborating with architects and contractors, structural engineers ensure projects are both efficient and resilient. Find more insights here at our Structural Engineering Services page.
How to Choose the Right Structural Engineer
When selecting a structural engineer, consider these factors:
- Qualifications: A degree in structural engineering or civil and structural engineering is essential.
- Skills and Experience: Review their portfolio to assess their ability to design buildings and structural work similar to your project.
- Communication: A structural engineer works closely with architects, project managers, and construction companies, so clear communication is key.
- Reputation: Look for reviews or recommendations from past clients.

Why Structural Engineers are Essential
Structural engineers actually solve some of the most complex challenges in the construction industry. From designing earthquake-resistant buildings to ensuring the structural integrity of bridges, their work safeguards lives and investments. Engineers advise on building materials, draw construction plans, and ensure the stability of building structures throughout the construction process.
If you’re planning a new construction project or renovation, need a structural engineer’s assessment, or want to ensure compliance with building codes, contact us today. Our experienced structural engineers are passionate about delivering tailored solutions for homes, offices, and infrastructure across New Zealand.