At Inside Systems Limited (ISL), we provide complete commercial plumbing, HVAC, and certified welding services for businesses across Invercargill, Southland, and Central Otago. With over 30 years of industry experience, our team is trusted by schools, manufacturers, restaurants, offices, and more to deliver reliable, compliant, and cost-effective solutions. From large-scale installations to routine servicing, we understand the unique demands of commercial and industrial sites.
We combine technical expertise with a strong focus on safety and compliance, ensuring every system is built and maintained to meet strict industry standards. Whether you need HVAC servicing, pipe welding, or backflow prevention, our skilled technicians are here to provide practical, long-lasting solutions.
Heating and Air Conditioning Services for Businesses
Inside Systems Limited offers a full range of heating and cooling services to keep commercial buildings comfortable and compliant. From supplying and installing systems to ongoing maintenance, our HVAC solutions are tailored to your specific needs. With regular testing and servicing, you’ll enjoy consistent performance, better energy efficiency, and improved indoor air quality.
Our team also provides full certification services to help you meet Building Act requirements. Whether you operate a small retail shop or a large industrial facility, we’ll ensure your systems are safe, efficient, and legally compliant.
HVAC Supply and Installations
We supply and install heating, ventilation, and air conditioning systems designed for commercial use. From small split systems to large-scale solutions, we can recommend and install the right system for your building.
Testing and Servicing – SS9 and SS11
We carry out testing and servicing of mechanical ventilation systems (SS9) and fume cupboards (SS11). Regular checks help maintain air quality and ensure compliance with regulations.
Building WOF and IQP Testing
We provide Building Warrant of Fitness (BWOF) and Independent Qualified Person (IQP) testing for commercial HVAC systems. This ensures your systems remain safe, healthy, and compliant under the Building Act 2004.
Commercial Plumbing Services
Our commercial plumbing team works with businesses of all sizes, offering a wide range of services from general maintenance to complex installations. Whether you need urgent repairs or a complete plumbing fit-out for a new facility, we have the experience to handle it. We also provide backflow testing and prevention services to ensure your water supply remains safe and compliant.
We know downtime costs businesses money, which is why we deliver prompt, efficient service without cutting corners. From offices and cafes to manufacturing plants, we’ll keep your plumbing systems performing as they should.
General Plumbing for Businesses
We handle all types of general plumbing work, including repairs, blockages, installations, and maintenance for commercial properties.
Hot Water Systems
Our team installs and maintains hot water cylinders and heat pumps designed for commercial use. We’ll help you choose the right system for your needs.
Backflow Testing and Prevention
We provide certified backflow testing, installation, and maintenance to protect your water supply from contamination.
Certified Welding and Engineering Services
In addition to plumbing and HVAC, Inside Systems Limited offers expert welding and engineering services for commercial and industrial clients. From stainless steel piping systems to boiler welding, our certified welders can take on projects of any size. We work both on-site and in our workshop, delivering high-quality welding solutions to meet industry standards.
With certifications including
ASME IX and EN 287, we’re qualified to carry out welding on air, water, steam, and oil lines. Our team also specialises in repairing cracks, tube plates, and large pipe systems. Whether it’s TIG or arc welding, we bring precision and reliability to every project.
Pipe Welding for Industrial Systems
We weld all types of stainless steel and carbon steel piping systems for commercial and industrial use.
Certified Pipe Welding – ASME IX and EN 287
Our welders are certified to work on air, water, steam, and oil lines, meeting strict international standards.
Screwed and Victaulic Piping Systems
We install and maintain galvanised and Victaulic piping systems for commercial projects.
Boiler Welding and Repairs
Our team repairs cracks and tube plates and carries out other essential boiler welding services.
Onsite and Workshop Welding Services
We offer both TIG and arc welding for projects large and small, completed onsite or at our fully equipped workshop.
Industries and Businesses We Work With
Over the years, Inside Systems Limited has worked with a wide range of businesses and organisations. Our clients include retail stores, offices, daycares, manufacturers, hospitality venues, schools, apartments, restaurants, and cafes. Whatever your industry, our team provides professional solutions tailored to your needs.
By choosing ISL, you’ll gain a trusted partner who understands the importance of compliance, reliability, and minimal disruption to your operations. No matter the size or scope of your project, we’ll work with you to achieve the best outcome.
Frequently Asked Questions
Do you provide HVAC installations for commercial buildings?
Yes, we install and maintain heating, ventilation, and air conditioning systems for businesses of all sizes.
What types of welding services do you offer?
We offer certified pipe welding, boiler welding, Victaulic piping, and both TIG and arc welding for large and small projects.
Is backflow testing a legal requirement for businesses?
Yes, many commercial properties require backflow testing to comply with health and safety regulations. Our team is certified to carry out testing and prevention.
For expert commercial plumbing, HVAC, and welding services in Invercargill, Southland, and Central Otago, trust the experienced team at Inside Systems Limited. Contact us today to request a free quote or schedule a service.
