Residential
Homes & renovations
New builds, extensions, decks, retaining walls, pools and additions — designed to protect your investment and pass consent.
Kiwi-owned · Botany, Auckland
Strong solutions for your vision.
Stable Structure Limited is a premier structural & civil engineering consultancy. From your first sketch to final sign-off, we turn complex engineering challenges into practical, cost-effective, fully compliant designs — right across New Zealand.
NZ Building Code compliant
Consent-ready documentation
Fast, responsive turnaround
Code-compliantNZS & NZ Building Code
Concept → CompletionEnd-to-end engineering
100%
Compliance-focused design
5.0★
Average client rating
12+
Engineering service lines
NZ
Wide project coverage
What we do
Full-service structural & civil engineering
One consultancy for the whole journey — design, documentation, consent and construction. Explore our services below.
Structural Design
Robust, efficient structural systems for new builds, additions and alterations — foundations, framing, beams, bracing and load paths.
Learn moreCivil Design
Site development, earthworks, drainage, stormwater and access design that works with your land and satisfies council requirements.
Learn moreBuilding Consent Documentation
Detailed drawings, calculations and PS1 documentation prepared to give your consent application the best chance of a smooth approval.
Learn moreSite Inspections
On-site verification at key construction stages to confirm work is being built to the approved design and standards.
Learn moreConstruction Supervision
Ongoing engineering oversight from groundwork to hand-over, so issues are solved early and quality is maintained throughout.
Learn moreRetaining Walls
Engineered timber, block and concrete retaining wall design that manages loads, drainage and slope safely and economically.
Learn moreSwimming Pools
Structural design for in-ground and above-ground pools, pool surrounds and associated retaining and fencing compliance.
Learn moreDecks & Outdoor Living
Safe, durable decks, pergolas and outdoor structures — including high or cantilevered decks that need proper engineering.
Learn moreCarports, Sheds & Portals
Portal-frame and light-structure design for carports, sheds and outbuildings — practical spans built to last.
Learn moreWho we work with
Engineering across every sector
From a homeowner's first deck to a developer's commercial build, we bring the same rigour, clarity and compliance to every project.
Commercial
Commercial & retail
Fit-outs, mixed-use and commercial buildings engineered for developers and investors — efficient, buildable and code-compliant.
Industrial
Industrial & warehousing
Portal frames, warehouses, sheds and industrial structures with the load capacity and durability your operation demands.
Why Stable Structure
Complex engineering, made simple and certain
Our job is to remove the risk and guesswork from your build. We translate ambitious ideas into designs that are practical to build, kind to your budget, and confidently compliant with New Zealand standards.
Practical, cost-effective solutions
We value-engineer every design so it is economical to build without compromising safety or performance.
Compliance you can rely on
Every project is designed to the NZ Building Code and relevant standards, with clear documentation for council.
Expert guidance at every stage
Clear communication and hands-on advice from concept to completion — you are never left guessing.
Responsive, on-time delivery
We keep your project moving with fast turnaround and proactive engineering support.
Our promise
“Every design leaves our desk buildable, compliant and clear — engineered to give you technical confidence from concept to completion.”
SS
Stable Structure LimitedStructural & Civil Engineering · Auckland
Client reviews
Rated 5.0 on Google
Our clients rate Stable Structure 5 stars for technical expertise, communication and attention to detail.
Google review
“We have worked with Gajanthan Vethanathan and Stable Structure on multiple residential development projects, and the level of service has been exceptional every time.
Gajanthan is an outstanding Structural and Civil Engineer with exceptional technical knowledge, professionalism, and attention to detail. He is always responsive, provides practical engineering solutions, and works closely with the entire project team to ensure everything runs smoothly. His advice has been invaluable throughout our developments, from the design stage through to construction.
As the engineering partner for A-Frame Builders, Gajanthan has consistently delivered high-quality work, met tight deadlines, and gone above and beyond to support our projects. His commitment, integrity, and problem-solving skills give us complete confidence on every job.”
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Haran / KashA-Frame Builders Ltd · 2 months ago · via Google
“Gajan and team are very efficient the designs are very thorough. They provide the details which are clear and easy to understand. They respond to site clarifications and council queries efficiently and resolve issues. I highly recommend them.”
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Prutvi Kumar2 months ago · via Google
“The team at Stable Structure as ‘solid’ to deal with. They are efficient and have superior knowledge in their field. We send lot of work their way as they get the jobs done fast and at a fair price point.”
A
Aleki BonLocal Guide · 2 months ago · via Google
“Gajan is a pleasure to work with. Professional, calm and considered. Looking forward to the next project.”
J
Jedd Forbes2 months ago · via Google
Let's talk
Ready to build with confidence?
Tell us about your project and we will get back to you with practical engineering advice and a free, no-obligation quote.