Latent conditions and brownfield risk: pricing what you cannot see
A latent condition is a physical condition on or under the site that a competent contractor could not reasonably have anticipated from the information provided and a reasonable site inspection. Standard contracts deal with it in a dedicated clause, and that clause decides whether the cost of the surprise sits with you or with the Principal.
The test almost always turns on two things: what you were given, and what you could reasonably have found out. That makes the site information in the tender pack the boundary of your entitlement, and reading it closely decides whether a later claim has anything to stand on.
Extracting the latent conditions clause, the site information provided and every disclaimer attached to it is reading work Elora Grid returns quoted and cited. What allowance to carry against what remains is your estimator's decision.
How do contracts allocate latent condition risk?
Through a test rather than a list. The common form asks whether the condition differs materially from what a competent contractor would have anticipated, given the information made available and an inspection of the site that a reasonable contractor would have carried out.
Two moves shift that boundary in the client's favour, and both are common. Handing over more site information raises what you should have anticipated. Disclaiming the accuracy of that same information while still requiring you to rely on your own investigations narrows the room for a claim.
Why is brownfield electrical work the hard case?
Because the site is full of things nobody recorded. Cable routes that were changed during a commissioning weekend fifteen years ago. A switchboard whose as-built drawing shows a spare way that is not spare. Services under a slab that appear on no plan because they were added after the plan was drawn.
Then the constraint that makes it expensive: much of the work happens on live plant, so investigating in advance often needs an outage the client will not grant during tender. You are asked to price certainty about conditions you are not permitted to inspect.
How do you price what you cannot see?
Convert the unknown into something with a boundary. Ask for the surveys and the outage access during the question period, because an unanswered request is itself evidence about what information was available to you.
Where the unknown remains, choose a mechanism rather than a guess. A provisional sum for the investigation, a stated allowance with the assumption written next to it, a qualification limiting your position to the information provided, or a rate for the work if it turns out to be needed. Any of the four can be defended later, which a number carried silently cannot.
What kills a valid claim?
Notice. Latent condition clauses almost always carry a notification requirement with a short time limit, and entitlement that was real on the day can be lost by telling the client three weeks later.
The second killer is your own bid. A qualification that says you inspected and satisfied yourself as to all site conditions, signed to get a bid over the line, is the sentence the client's lawyer will read back to you. Check what you are asked to warrant about the site before you sign it.
What to check, and what to do
| In the pack | Why it matters | What to do at tender |
|---|---|---|
| The latent conditions clause | Sets the test, and the notice period | Quote it into the risk list, notice period included |
| Site information provided | Raises what you are taken to have anticipated | List everything provided; it defines your boundary |
| Disclaimers on that information | May shift reliance risk back to you | Read them against what you are asked to warrant |
| Site inspection obligations | A missed inspection weakens a later claim | Attend, record what you saw and could not access |
| Outage and access constraints | Decides what you were able to investigate | Request access in writing; keep the answer |
| As-built documentation | On brownfield sites it is often wrong | Qualify reliance on it, or price verification |
- 01Quote the clause and its notice period early. Both go into the risk list in the first 48 hours, not into the estimator's memory.
- 02Inventory every piece of site information provided. That list is the boundary of what you are taken to have known.
- 03Ask for what is missing, in writing. Surveys, as-builts and outage access, requested during the question period and the response kept.
- 04Attend the site inspection and record it. Photograph what you saw, and note in writing what you were not given access to.
- 05Choose a mechanism for each remaining unknown. Provisional sum, stated allowance, qualification or a rate, never a silent number.
- 06Carry it into delivery. The assumptions and the notice period go into the handover record, so the project team can act in time.
Common questions
What is a latent condition?
A latent condition is a physical condition on or under the site that a competent contractor could not reasonably have anticipated from the information provided and a reasonable site inspection. The contract's latent conditions clause sets the test and allocates the cost of the difference.
Does a site inspection remove your entitlement?
Not by itself, but it defines what you should have seen. The test asks what a reasonable inspection would have revealed, so attending and recording what you could and could not access strengthens a later position. Skipping the inspection weakens it without saving anything.
Why do latent condition claims fail?
Most often on notice: the clause carries a short notification period and the claim is made too late. After that, on the information point, where something in the pack or a warranty in the bid shows the contractor either knew or accepted the risk of not knowing.
How do you price brownfield unknowns?
With a mechanism rather than a guess: a provisional sum for investigation, a stated allowance with its assumption written beside it, a qualification limiting reliance to the information provided, or an agreed rate if the work proves necessary. Whichever you choose, record it so delivery can defend it later.