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Commercial
We work alongside architects, designers, builders and business owners on commercial projects of every scale - from warehouses, sheds and offices through to retail spaces, specialised facilities and larger multi-use developments.
We design across structural steel, reinforced concrete and timber, developing most jobs in 3D analysis and Revit models so the design is well resolved before it reaches site.
Practical structural design that is clear, coordinated and buildable - with straightforward advice, clear drawings and cost-effective solutions that move smoothly from concept to consent and construction.
Commercial projects
A selection of commercial, office and institutional buildings we've helped deliver across New Zealand.
Office / Retail
Institutional
MAPU/EDOA building Palmerston North Hospital
Wesley Broadway Methodist Church
Lindisfarne College, Hastings
Pasifika Community Centre
Feilding High School Classrooms
Freyberg High School Weathertightness Remediation - Various Buildings
Terrace End School Classroom/Admin Remediation
Palmerston North Intermediate Normal - ILE Alterations
WSP Building
Westpac Terrace End
Humphries Construction Head Office
Max Tarr Electrical & Mechanical
Big Barrel Retail Building, Feilding
ACC Palmerston North Office
Commercial structural engineering FAQs
Answers to some of the questions we are most often asked about commercial structural engineering.
A commercial building generally needs full specific engineering design – it's rarely covered by the prescriptive residential standard NZS 3604. A structural engineer would normally design the structure of the building and prepare CAD drawings then issue a PS1 for building consent. The structural engineer then usually undertakes construction monitoring and issues a PS4 construction review for the Code Compliance Certificate. The design must reflect the building's importance level and its wind and seismic actions. Larger or higher-consequence buildings may also require independent peer review (PS2). Vert-X provides commercial structural design nationwide.
Importance level rates the consequences of a building failing, and it directly scales the wind and earthquake loads it must be designed for, under AS/NZS 1170.0. There are five Importance Levels: IL1 (minor structures – farm sheds, small outbuildings etc); IL2 (normal buildings – most houses, offices, warehouses, retail etc); IL3 (crowds or high community value – buildings holding large numbers of people, conference centres, larger schools); IL4 (post-disaster critical – hospitals with emergency facilities, fire/police stations, key lifelines); and IL5 (catastrophic-consequence – major dams, hazardous facilities). Most commercial and industrial buildings are IL2. Higher IL buildings must be designed for larger, rarer earthquakes and wind loads with often stricter performance requirements, which increases cost. Getting the IL right early is critical as it can change the whole design basis.
A portal frame is a steel (or timber ) frame of columns and rafters joined by rigid, moment-resisting connections, giving a clear, unobstructed span – which is why it's the workhorse of warehouses, factories, farm buildings and retail sheds. It resists wind and earthquake through the stiffness of those connections rather than internal bracing. This can provide maximum usable floor area and headroom. A structural engineer sizes the members and connections, designs the footings for uplift and lateral loads, and specifies roof and wall bracing. Spans commonly range up to 30–40m but can be much greater.
It may, if it's an older building, of unreinforced masonry or pre-1976 construction, or your council has flagged it as potentially earthquake-prone (i.e. an Earthquake Prone Building or EPB). Under the Building Act 2004, councils identify potentially earthquake-prone buildings and require the owner to provide an engineering (seismic) assessment, generally within 12 months of notice. A building rated below 34%NBS is legally earthquake-prone and must be strengthened or demolished within set timeframes. Assessments are also commonly triggered by purchase, lease, insurance or refinancing. Note the EPB system is under reform (Bill introduced December 2025) – if enacted, Auckland, Northland and the Chatham Islands leave the system and the focus narrows to pre-1976 concrete 3+ storey and unreinforced masonry buildings. Vert-X can provide ISA and DSA assessments plus practical seismic strengthening designs where required.
Peer review is an independent check of the structural design by a second qualified engineer, recorded as a PS2 (Design Review). Councils commonly require it for larger, taller, higher-importance-level or unusual buildings or where an alternative solution or complex analysis is used, to give reasonable grounds that the design complies before consent. Getting a Peer Review can also sometimes speed up the processing through building consent. Whether your project needs it depends on the council, the building's scale, Importance Level, its complexity and also on the general design and building consent programme. Vert-X can provide advice on a project by project basis.
Commercial structural engineering fees vary widely with scale, complexity, importance level and ground conditions – so a figure should come from a project-specific fee proposal rather than a rule of thumb. Simpler industrial buildings (a standard portal-frame shed on good ground) sit at the lower end; multi-storey, irregular, high Importance Level or difficult-ground buildings cost considerably more, and any required peer review adds to it. The most reliable way to control cost is to engage the engineer early in the design process so the general layout and structural system is efficient from the start.
Structural engineering design of a warehouse or large format retail space means designing the portal frames, roof and wall bracing, purlins and girts, the concrete floor slab, and the foundations – plus the cladding support and any precast or blockwork wall panels – to carry gravity, wind and seismic loads. The engineer confirms the importance level and allows for items that affect the design such as gantry cranes, mezzanines or racking. The structural engineer issues a PS1 for consent and a PS4 for construction review. Floor slabs for heavy loads or poor ground need specific design. Vert-X handles these designs nationwide.
Commercial and industrial structures are designed to specific engineering design using the loadings and materials standards, not the residential NZS 3604. The key ones: AS/NZS 1170 for loads (including NZS 1170.5 for earthquake actions), NZS 3404 for steel structures, NZS 3101 for concrete, and NZS 4230 for masonry. The overarching requirements are Building Code clause B1 (Structure) and B2 (Durability). The engineer selects the Importance Level, determines wind and seismic demands for the site, designs each element and connection, provides CAD structural drawings and issues PS1.
A multi-storey building needs full specific engineering design of its lateral load-resisting system – how it resists earthquake and wind sideways forces – as well as gravity design of floors, columns and foundations. The engineer analyses the whole building's response to seismic shaking under NZS 1170.5, designs the frames, walls or braced systems to NZS 3404 or NZS 3101, confirms the importance level, and coordinates with a geotechnical engineer on foundations. Peer review (PS2) is common for taller buildings. Fire, floor vibration and inter-storey drift also feed the design. This is complex, consequence-heavy work where early engineering involvement and coordination with the architect pays off most. Vert-X specializes in buildings 1-3 storeys and brings in specialist engineers as part of our design team for taller buildings when needed.