Switchboard upgrade and replacement projects need more upfront information than equivalent new-build work. The more clearly a project is defined at enquiry stage, the more accurate the pricing, the tighter the programme, and fewer surprises on site.
Quick answer
A switchboard upgrade or replacement enquiry needs ten information areas to be priced accurately: existing board details, the reason for the work, electrical ratings and fault level, outgoing circuits, dimensions and physical constraints, site access and environmental conditions, shutdown and changeover requirements, drawings and photos, compliance and documentation expectations, and programme. The more of these defined at enquiry stage, the more reliable the quotation and the lower the risk of later redesign.
In this article
If you are planning a switchboard upgrade or replacement, the most useful starting point is not the price. It is the information.
Existing site switchboard work is usually more complex than a comparable new build board because the project has to deal with the realities of what is already installed. That can include restricted access, limited shutdown windows, ageing equipment, incomplete drawings, unknown cable conditions, and physical constraints that are only obvious once the site is reviewed properly.
At a practical level, a good enquiry needs enough detail to answer six questions clearly:
The clearer those answers are, the easier it is to define scope, compare quotations properly, and reduce avoidable redesign later.
A new switchboard for a new building is usually designed around known parameters. A replacement or upgrade board often has to fit within existing conditions that may be only partly documented. That changes the risk profile.
Common complications in replacement projects include:
That is why a brief enquiry such as “please quote a replacement switchboard” is rarely enough on its own. The project may still be quotable, but the response will rely on assumptions, exclusions, or later clarification.
These terms are often used loosely, but they are not always the same thing.
This distinction matters because the information needed can differ. A full replacement often places heavier emphasis on removal, access, dimensional fit, and cutover sequencing. An upgrade may place more emphasis on compatibility, retained equipment, and how the new work interfaces with the existing installation. For boards no longer supportable, see our notes on switchboard maintenance and end-of-life indicators.
The easiest way to approach this topic is as a project-definition checklist. These are the ten areas that determine whether a replacement or upgrade can be priced, designed, and planned with confidence.
Start with the board that is already in service. Useful information includes:
The project should define why the work is being done. Typical drivers include:
The reason helps shape the scope. A board being replaced because it is physically deteriorated may need a different solution from one being upgraded to support new loads or a building alteration.
This is one of the most important technical sections. The project should include, where available:
If the fault level is known, it should be stated clearly. If it is still being confirmed, that uncertainty should be identified rather than left hidden. In upgrade and replacement work it is especially important not to assume that the new board can mirror the old one without checking whether site loads, protection requirements, or system conditions have changed. See our guide on what fault rating a switchboard needs.
A replacement board is not defined only by its main rating. It also needs to be defined by what it has to distribute, protect, or control. Useful information here includes:
This is where replacement work often becomes more complicated than people expect. Helpful inputs include:
A board that works electrically may still be impractical if it cannot be delivered into the room, positioned safely, or aligned with the available cable approach.
Quoting and planning both improve when real site conditions are known early. Examples include:
These details may influence enclosure design, IP requirements, installation planning, and commercial allowances.
This is often the most commercially important part of a replacement project. Questions worth clarifying early include:
For many existing-site projects, the shutdown strategy is not a minor operational note. It is central to how the board is designed, priced, delivered, and installed.
Documentation quality strongly affects quote quality. Useful source material may include:
Not every project will have a complete package. But the more reference material available, the less the scope has to rely on guesswork. Where design input is needed, our electrical consulting and design team can work alongside the project engineer to complete missing information.
The enquiry should also define what the finished project needs to deliver beyond the physical board itself. Depending on the project, that may include:
It is better to identify these requirements early rather than introduce them once the quotation or build is already underway.
If the project has a delivery date, outage milestone, staged installation sequence, or procurement deadline, that should be included in the initial scope. Programme information helps clarify:
A technically detailed enquiry can still be incomplete if it says nothing about time.
A replacement project is not just a new board. It is a new board that has to fit a site, a shutdown window, and an installation reality that already exists. Every one of those shapes the design.
In practice, replacement and upgrade projects often slow down because one or more of the following is missing:
These gaps do not always stop a quotation. But they often lead to clarifications, assumptions, or a broader qualification basis.
Pre-enquiry checklist
If several of those are missing, the project may still proceed, but the quoting basis is likely to be less certain.
Clive Wilson Switchboards handles switchboard upgrade, replacement, and retrofit projects nationwide from our Invercargill workshop. Current and recent replacement projects span from Auckland and Northland in the north, through Hamilton, Tauranga, Rotorua, New Plymouth, Napier-Hastings, Palmerston North, Wellington, Nelson, and Queenstown, to regional infrastructure across Southland and the West Coast.
Replacement and upgrade work crosses every sector we serve: meat works in Auckland, dairy and food processing plants in Taranaki, Waikato, and Southland, water and wastewater upgrades in Wellington and New Plymouth, aluminium and metals processing facilities in Southland, and commercial and light industrial boards in Hamilton and Tauranga. The same ten information areas in this guide apply regardless of location or sector.
We build on four proven platforms: Schneider Prisma Plus G (accredited builder), Simotrol, Logstrup, and Quantum. Platform selection is driven by your specification, fault level, IP requirement, footprint, and operational environment. Manufactured under our ISO 9001-certified quality management system, with assemblies designed and verified to AS/NZS 61439. Avetta registered and SiteSafe registered for procurement on major infrastructure projects. See our case studies for examples of recent upgrade and replacement work.
What information is needed for a switchboard upgrade or replacement? More than just the board size or a rough scope note.
A good enquiry should describe the existing installation, the new technical requirement, and the practical realities of the site. That combination is what allows the project to be reviewed properly.
The main goal is not to create paperwork for its own sake. It is to reduce ambiguity early so the replacement or upgrade can be priced, designed, and planned on a realistic basis.
Circuit identification labels and directories should be reviewed and updated as part of any switchboard replacement or upgrade. For engraved identification plates and circuit labels, see our engraving service.
A switchboard upgrade involves modifying an existing board, adding circuits, replacing protective devices, or improving capacity, without a full removal. A replacement involves taking out the existing board entirely and installing a new assembly. Each approach has different scoping, shutdown, and compliance implications and the distinction should be established early.
Useful information includes the existing board name and location, what loads and circuits it currently serves, the incoming supply details, the physical dimensions and footprint of the existing board, available shutdown windows, and any known condition or capacity issues. Photographs, existing drawings, and cable schedules are also valuable if available.
Manufacture of a new switchboard typically takes 6 to 12 weeks once design is finalised and order confirmed, depending on complexity. The physical changeover (disconnection, removal, installation, and recommissioning) can range from several hours for simple boards to multiple days for complex main switchboards requiring planned shutdown windows.
Some upgrade tasks can be performed live under appropriate safety procedures, but most structural changes, new circuit additions, and device replacements require a de-energised board. The scope of live versus shut-down work should be agreed and documented at the planning stage before any work begins.
Post-completion documentation should include updated wiring and schematic drawings, a circuit schedule reflecting the new installation, test and verification records under AS/NZS 61439, Factory Acceptance Testing records, component data sheets, and a final schedule signed off by the responsible electrical engineer or certifier where required.
A full replacement is usually the right call when the existing board is more than 25 to 30 years old, when the supporting switchgear is obsolete or unavailable, when the fault level has outgrown the original assembly, when compliance documentation to current AS/NZS 61439 cannot be established, or when repeated modifications have left the assembly hard to maintain safely. An upgrade is appropriate where the base assembly is sound and only specific sections or ratings need to change.
Yes. For projects where drawings are incomplete, where site conditions carry meaningful uncertainty, or where shutdown planning will drive the build strategy, a pre-enquiry site visit is the most reliable way to scope the work. We travel for site visits nationwide from our Invercargill workshop.
Reviewed by Chris Wilson, Co-Director, Clive Wilson Switchboards. Registered electrician, 15+ years in LV switchboards. Updated April 2026.
