Waikato Gable & Circular Building Experts

O’Neill Engineering builds weatherproof space where you need it most!

Experienced Team

With over 50 years of expertise, O’Neill Engineering has been a trusted name in building gable and circular structures across the Waikato region.

Quality Solutions

We deliver durable and innovative building solutions tailored to meet your unique needs.

Professional Service

From first contact to completion, our team ensures clear communication, reliability, and exceptional workmanship every step of the way. 

Welcome to O’Neill Engineering

50 Years+ Experience

O'Neill Engineering boasts a long-standing reputation for manufacturing and constructing circular and gable steel farm buildings across the Waikato for more than 50 years, providing both construction and kitset options. Throughout this time, O'Neill Engineering has built thousands of durable sheds that continue to serve their purpose today. Designed with farmers in mind, an O'Neill shed can be used for a range of purposes, from calving and farm storage to serving as a workshop, boat storage, or car garage.

Our Gable & Circular Buildings

A green and red building with a fence in front of it

Gable Buildings

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A large empty building with a curved roof

Bin Covers

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A large white building is sitting in the middle of a field.

Half-Round

Stark beauty of desolate dunes
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A truck is parked in front of a green building

Lean-to

Visual odyssey across continents
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A large building with a clear roof sits in a gravel area

Customer Testimonials

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    ★★★★★


    "I am very pleased with the barn and the crew that erected the building leaving the site clear of rubbish. Please pass on my thanks for a great job." – Gary (Half Round Barn)

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    ★★★★★


    "Thanks for erecting the Bin Cover so quickly. I have used the 4 wheel motorbike to pull the roof off and it works well." – Neville (Bin Cover)

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    ★★★★★


    "We were very impressed with the roofers - they worked all day on a Sunday, never stopped." – Peter and Bo (New Roof)

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    ★★★★★


    "We would like to acknowledge the awesome work the guys did with the shed. The workmanship is wonderful and the guys worked well together. We will have no hesitation in recommending your sheds to friends and family. Please pass on our gratitude to the team of guys." – Sharon and Vaughn (Bay Round Barn)

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New Shed Quotes & Enquiries

Please get in contact or visit our warehouse to discuss your new gable or circular building needs!