When you are planning a commercial or industrial build, the tender stage can feel like the point where everything becomes clear.
You have drawings. You have a scope. You have prices from different contractors. It can be tempting to line the numbers up and choose the lowest one.
That is where many projects get into trouble.
Two tenders can look like they are pricing the same building, but they may not be carrying the same scope, assumptions, allowances, programme risk, or level of detail.
One contractor may have allowed properly for ground conditions, services coordination, council timeframes, site establishment, and a realistic construction programme.
Another may have priced sharply to win the job, with more exclusions, softer allowances, or optimistic assumptions sitting behind the number.
Both prices sit on the same page. They look comparable. Often, they are not.
For a commercial or industrial project, choosing the wrong contractor is not just a procurement issue. It can affect funding, lease commitments, tenant confidence, operational start dates, cashflow, and the return you expect from the project.
The tender price is not always the final project cost. It is the contractor’s offer based on the information available at the time.
If the design is not de-risked, the geotech has not been fully interpreted, services are unclear, or tenant requirements are still moving, the price will be built on assumptions.
The better question is not “which tender is lowest?” But is “which tender has the most inclusions, least risk and gives us the clearest and most realistic view of what this project will actually cost to deliver?”
What has been excluded?
Every tender has exclusions. That is not automatically a problem.
Contractors use exclusions to manage risk around things they cannot price with confidence. This may include unknown ground conditions, existing underground services, contamination, council timeframes, utility upgrades, tenant changes, weather events, or design items that have not been fully resolved.
The issue is that excluded risk does not disappear. It usually moves back to you as the client.
Before comparing prices, line up the exclusions side by side and ask:
- What has each contractor chosen not to include?
- Are any exclusions linked to major cost or programme risks?
- Has one contractor excluded something another has included?
- If the excluded item becomes real, who pays?
- What happens to the programme if that risk appears?
This is where a cheaper tender can start to look less attractive.
A low number with a long exclusions list may simply mean you are accepting more risk upfront and discovering the cost later.
What assumptions sit behind the price?
Commercial and industrial tenders are often built on assumptions that can materially affect the final cost.
A contractor may have assumed standard ground conditions, no major service diversions, a straightforward consent pathway, standard working hours, limited tenant fit-out, no staging around an operating business, or no major fire design complications.
For a warehouse, depot, showroom, manufacturing facility, bulk storage building, or aviation facility, those assumptions matter.
Vehicle movement, yard layout, clear height, racking, fire design, floor loads, canopy cover, office layout, drainage, power capacity, and future expansion can all affect the real cost and performance of the building.
If those requirements are not understood and priced properly, they usually reappear later as redesign, delay, or variation.
Before signing, ask the contractor to talk you through the key assumptions in plain English.
A strong contractor should be able to explain what they have allowed for, what they have not allowed for, and where the main risks sit.
Are the allowances realistic?
A tender can look fixed while still carrying a lot of uncertainty.
Provisional sums and prime cost allowances are common examples. They are useful when parts of the project are not fully resolved, but they need to be treated carefully.
If the allowance is too low, the tender looks better than it really is. Once the actual cost is known, the difference comes back to the client.
Common areas where this can happen include:
- groundworks
- drainage
- retaining
- power upgrades
- fire protection
- access roading
- landscaping
- office fit-out
- mechanical services
- specialist doors
- tenant-specific requirements
The presence of allowances is not the problem. On many projects, they are unavoidable.
What matters is whether those allowances are realistic for the type of building you are delivering.
Ask how each allowance was calculated. Is it based on supplier quotes, recent project data, or a rough estimate? Which allowances are most likely to move? What happens if the final cost is higher?
A tender with realistic allowances may look more expensive at the start, but it can give you far more control over the final outcome.
Has the programme been properly tested?
Every tender comes with a programme. It may look detailed and reassuring, but a tender programme is often prepared to support the bid. It is not always a fully tested, buildable sequence of work.
That matters because time carries a real commercial cost.
For a business owner, delays can affect production, storage, staff planning, lease exit dates, machinery installation, customer commitments, and the point where the building starts generating value.
For a developer, delays can affect funding, tenant agreements, holding costs, pre-lease conditions, and market timing.
Before relying on a programme, ask:
- Has the contractor allowed realistic council timeframes?
- Does the programme account for long-lead materials?
- Has procurement been properly sequenced?
- Is there enough time for design coordination before construction starts?
- Is there any float, or is every task sitting on the critical path?
- Has the contractor delivered similar projects in this region before?
Two contractors may both show a 30-week build. One may have a practical plan to achieve it. The other may have a more optimistic spreadsheet.
Where could variations come from?
Variations are common in construction and some are genuinely unavoidable. Ground conditions can differ from what was expected. Council requirements can change. A tenant may alter their requirements. A business owner may decide to upgrade part of the building.
But not all variations are equal.
There is a big difference between a genuine unforeseen issue and a variation that appears because the tender was thin, rushed, unclear, or based on incomplete scope.
Ask the contractor:
- Where do you see the biggest variation risks?
- What have you included to reduce those risks?
- What have you not included?
- How will variations be priced and approved?
- What information do you still need to firm up the price?
A good contractor will not pretend there is no risk. They will explain where the uncertainty sits and how they plan to manage it.
The contractor who says everything is covered but cannot explain the detail is the one to be careful with.
Does the building support the business case?
For commercial and industrial projects, the building needs to support a business, tenant, or investment outcome.
A cheaper tender may solve the basic construction brief but miss operational details that affect long-term performance.
Ask whether the yard works for truck movements. Whether the warehouse clear height supports racking. Whether the office is positioned well for staff, customers, and operations. Whether floor loads, access points, canopies, roller doors, services, fire design, and future expansion have been properly considered.
For a business owner, getting this wrong can create inefficiency for years.
For a developer, it can affect tenant appeal, rental return, and how adaptable the building is for future occupants.
If you are also weighing up how the project should be structured, it is worth reading our article on fragmented projects and what happens when nobody owns the whole job.
The bottom line
Tendering is not just a pricing exercise. It is where a lot of project risk gets allocated.
The contractor you choose, the scope you accept, the exclusions you agree to, and the assumptions you leave untested can shape the entire project.
For a commercial or industrial build, the cheapest tender can easily become the most expensive decision if it creates delays, variations, redesign, or a building that does not properly support the business case.
