When should you use a shed builder?

If you have land and are thinking about self storage, you’ve probably already got a quote from a shed builder. It probably came in cheaper – at least on paper – and now you're trying to work out what you'll actually save versus what you stand to lose.

It’s a fair question. A shed builder may be the right choice if you need a simple structure, if your goals are modest, and your main priority is keeping the upfront build cost down.

But if you're building a facility you plan to run as a business or sell as a commercial asset, the decision needs a closer look.

Do you want to maximise your investment?

The gap between gross floor area and net lettable area is the difference between what you pay to build and what you can charge for.

The Australasian self storage sector spans 3,380 facilities and $20 billion in value. The development pipeline is at record levels, with more developers entering the market every year. And, with land and construction costs sitting where they are, any gain in construction efficiency is worth examining carefully.

The real question, however, is what those gains cost you in rentable space.

Start with how the site is laid out. Ranch-style buildings – back-to-back units with driveways between them – may be simple to build, but they hand over a large part of the site to access lanes instead of rentable units. Once the facility is built, that space is gone.

The same principle applies inside the building. Framed walls typically sit at around 90mm thick. Multiply that across every internal wall in the facility and you are losing meaningful space that you can't charge for. The gross floor area stays the same - the amount you can actually rent out doesn’t.

The Early-stage design decisions compound this further. Land and development costs are making single-level builds increasingly unlikely to offer long-term value. Shed builders often use an over-spec'd portal frame that's heavier and more expensive to build – if they build above single level at all. 

The structure-first approach also limits unit mix. Planning the unit mix first and the building structure after means you have a wider range of unit sizes. This means serving more customers and a more efficient use of floor area. When the building frame dictates the layout, that layout approach is usually the first thing that’s lost.

In self storage, lost space is lost income. Once the site is built, you can’t easily reclaim the metres handed over to thicker walls, awkward access, or a layout that was never designed to earn at its full potential.

Do you want a facility that customers can trust?

A shed builder starts with the structure. Standard framing, standard engineering, standard materials – and the storage layout gets worked out around whatever fits inside the building.

What this doesn't give you is a facility designed around how it needs to perform. The unit mix – the sizes, the balance of internal and external units, how corridors are configured – is what drives revenue. If that gets determined by the structure rather than by what your customers actually need, the layout is already working against you.

Take columns, for example. Facility corridors are generally 1.5 metres wide. If a column ends up inside that corridor – even partially – customers have to navigate around it. This isn’t the kind of problem that shows up easily on a layout plan, but for a customer wheeling in a trolley full of gear or moving a fridge, it’s an unnecessary obstacle.

The problem compounds when a shed builder over-specifies the structure. Fewer but heavier columns have a larger footprint, and that footprint tends to land exactly where customers need to move.

A facility designed specifically for self storage handles this differently. More columns, but narrower – 75×75mm is a common specification – positioned at the backs of units where they stay out of the way during move-ins and don't reduce the usable space customers are paying for.

Customers won’t ask about column placement, corridor width, or unit configuration, but they notice when a site is hard to use – and their reviews of your facility will show it. A facility designed specifically for self storage removes these challenges before it becomes part of the customer experience.

If you want a facility that stands up

Not every product used in a shed is right for self storage.

Internal partition walls are a good example. Shed-style facilities often use adapted zinc sheet or fencing products as dividers, but those sheets are not designed to lock together as a secure storage wall. With a bit of lateral pressure, a wall panel can be forced apart – exposing the unit next door. In a basic ranch-style layout, that means one thief can give access to an entire row of units.

Internal walls are not just there to divide the space. They need to help protect what is being stored and support the security of the facility as a whole.

Photo: broken fence panels

Roller doors are another area where the difference shows up. Storco roller and swing doors are manufactured to work with a standard stainless steel latch or an electronic lock – meaning security installers don't need to do any messy door cutting on site. They simply wire it up.

These may seem like small details in the build, but they directly impact the duration and quality of your build– and shape how the facility operates day to day.

Shed builders often run internal walls to the ceiling, leaving units effectively sealed. A customer who stores anything damp creates moisture that has nowhere to go, especially if the unit sits closed for months without proper airflow. The result is mould buildup and a lingering damp smell in stored belongings.

Cleaning and maintenance need the same attention. Standard corrugated sheeting installed horizontally can collect dust and cobwebs in every groove – and you're not just sweeping, you have to dust along every corrugated ridge, in every unit. Over time, the facility starts to look unkempt.

Vertically-installed corridor panels are easier to clean, and a clean facility tells customers the site is regularly checked by a person, not just monitored by cameras. That kind of visible upkeep is its own form of security – and it is often the first thing a prospective customer notices when deciding whether to trust a facility with their belongings.

A quick checklist before you decide

A shed builder may be the right choice if:

• The facility is small and a simple, ranch style back-to-back layout is sufficient
• Upfront build cost is the main priority.
• You are comfortable with standard shed materials and methods.
• Long-term operational performance is not the primary concern.
• You are not depending on the facility for maximum return over time.

A self storage specialist is worth the investment if:

• You want the layout designed around rental return.
• You need to make the most of the land available.
• You care about long-term presentation and customer experience.
• You want unit mix, ventilation, access, and products built specifically for self storage.
• You are building a facility you plan to operate, grow, or sell as a serious commercial asset.

The honest truth

Use a shed builder when the brief is genuinely simple and the expectations are realistic. If you need a basic structure and long-term performance is not the priority, a shed builder may well be enough.

But if you are building a self storage business – something you plan to operate, hold, and grow – the cheapest quote is only one part of the decision. The layout, the products, the ventilation, and the ongoing maintenance all affect how the facility performs once the doors open.

A good self storage facility isn’t just a shed with some dividing walls. It’s purpose-built to rent well, run well, and keep delivering value - long after the build is finished.