Speculative build or pre-commitment: how the decision gets made

By Brenscot Builders | Last reviewed September 2026

Every industrial development is built either for a known occupier or for an unknown one. That single choice changes the specification, the funding, the programme and the risk profile of the whole project. It is worth understanding whichever side of the transaction you are on — as a landowner deciding what to do with a site, as an occupier deciding how to get premises, or as an investor deciding what to buy.

The short answer

A speculative build starts construction without a committed occupier, carries leasing and market risk, and must therefore be built to a specification that suits the widest plausible range of tenants. A pre-commitment starts with a signed lease or contract, removes the leasing risk, and can be built to one occupier's actual requirements. Pre-commitment is lower risk and lower return; speculative is the reverse. Most sites suit one or the other for reasons that are obvious once the site is properly assessed.

Speculative development

How it works

The developer acquires the land, obtains the approvals, designs a building to a general-purpose specification and builds it, marketing it for lease or sale during construction or after completion.

What it requires

A specification that does not exclude anyone. The building has to work for occupiers you have not met. That means generous clear height, a sensible column grid, a slab rated for real racking loads, adequate power, door configuration that suits both container and van traffic, and yard depth that a semi-trailer can use. Every one of those is a cost, and cutting any of them narrows the market. See what occupiers actually look for.

Flexibility in the things that can be changed later. Office fitout, racking, line marking, security and internal partitioning are all better left to the eventual occupier. Building a speculative office to a particular business's layout wastes money twice. See warehouse office fitout.

A location with depth of demand. Speculative development works where there is a genuine pool of occupiers, which in the northern Brisbane and Moreton Bay corridor means the established industrial precincts with good arterial access. See the precinct guides for Brendale and Narangba.

Capital that can wait. A speculative building may be vacant on completion. The holding cost through that period — rates, land tax, insurance, finance — is part of the feasibility, not a surprise. See outgoings and running costs.

Where it goes wrong

Building to the wrong size is the most common failure. A developer who builds one very large building on a site that would have supported three medium ones has halved the number of occupiers who can take it. Multi-unit development, with the units sized to the demand actually present in that precinct, is usually the lower-risk read of a speculative site.

The second failure is under-specifying to protect a margin. A building with marginal clear height, a light-duty slab and an undersized supply will be compared directly against better buildings, and the discount required to let it usually exceeds what was saved.

Pre-commitment

How it works

An occupier agrees, in advance of construction, to lease or buy a building that will be built to an agreed specification. The developer proceeds on the strength of that commitment. The arrangement is documented before anything is built: an agreement for lease with the specification, programme and rent attached, or a contract of sale.

What it gives each side

For the occupier: a building designed around the operation, without funding the asset. Clear height, door positions, power, slab capacity and office location all set by how the business actually works. The occupier commits to a term and usually to a longer one than a speculative lease would attract.

For the developer: certainty. A signed commitment makes the project financeable on better terms, removes the leasing risk, and means the specification is being built for a real occupier rather than a guessed one.

What it requires

A specification locked down early and properly. This is the part occupiers underestimate. Once the agreement for lease attaches a specification, changing it is a variation with a cost and usually a time consequence. The time to think hard about clear height, power, door count, slab loads, fire services and expansion is before signing, not during construction. Get the occupier's operations people — not only the property people — into that conversation.

Realistic timing on both sides. The occupier's lease expiry, the approval programme and the construction programme have to line up. Where a development approval, operational works approval and building approval are all still to come, the timing risk sits mostly in the approvals, and an occupier working to a hard lease expiry needs that explained plainly. See how long it takes.

Clear allocation of risk. Who carries the approval risk, the ground condition risk, the cost of variations, and the consequences of delay, is set by the contract. Both parties need their own legal advice on it.

Where it goes wrong

Over-specialisation is the risk for the developer. A building configured tightly around one occupier's process may be difficult to relet at the end of the term. A good pre-commitment building satisfies the occupier and is still a general-purpose industrial building underneath.

For the occupier, the failure mode is a specification agreed too quickly. A pre-commitment is the one opportunity to shape the building, and an occupier who delegates the specification entirely to the developer has given up the main benefit of the arrangement.

How a site points to one or the other

Sites are not neutral. A few characteristics push a project decisively one way:

Precinct and access — a site in an established precinct with arterial and motorway access supports speculative development because the occupier pool is deep. An outlying site with constrained access needs a committed occupier.

Size and configuration — a site that naturally yields several mid-sized tenancies suits speculative multi-unit development. A site that only works as one very large building needs a pre-commitment, because the occupier pool for a single large building is thin.

Services capacity — a site where a high-capacity power supply requires substantial network work is difficult to build speculatively, because the cost has to be committed without knowing whether the eventual occupier needed it. A pre-commitment resolves that. See power supply and Energex connection.

Approval complexity — a site with referral agency triggers, significant earthworks, or an operational works approval with a long lead time is a longer programme, and a longer programme is harder to carry speculatively.

Holding capacity — the plainest test. If the project can absorb twelve months of vacancy on completion, speculative is on the table. If it cannot, it is not.

The hybrid most developments actually use

In practice a large proportion of industrial development is neither purely speculative nor fully pre-committed. A multi-unit estate is commonly started with one or two units pre-committed and the balance built speculatively. The committed units support the funding and de-risk the project; the speculative units capture the demand that appears once there is a real building to look at, which is consistently stronger than demand for a drawing.

That is usually the right structure for a site with depth. It is also why a landowner sitting on industrial land is often better served by talking to a developer-builder who will take a view on the whole project than by selling the land and watching someone else do it. See developer-builder versus construct-only builder.

Frequently asked questions

What is a speculative industrial building?

One built without a committed tenant or buyer, on the expectation that an occupier will be found during or after construction. It is built to a general-purpose specification for that reason.

What is a pre-commitment or pre-lease?

An agreement by an occupier, made before construction, to lease or buy a building that will be built to an agreed specification. The developer proceeds on the strength of it.

Is a pre-commitment cheaper for the occupier than building it themselves?

It is different rather than simply cheaper. The occupier avoids the capital outlay, the development risk and the approval risk, and pays for that through the rent over the term. Whether that is the better outcome depends on the business's cost of capital and how long it intends to stay.

How far in advance does a pre-commitment need to be signed?

Far enough for the remaining approvals and construction to run before the occupier needs to move. Where a development approval and an operational works approval are still to be obtained, that lead time can be substantial, and it is the first thing to test against the occupier's lease expiry.

Can a building be part pre-committed and part speculative?

Yes, and in multi-unit estates that is the common structure.

Sources

General information only

This article is general information, current as at September 2026. It is not legal, financial or valuation advice. Agreements for lease and development contracts should be reviewed by your own solicitor before signing.

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