Existing conditions risk is the defining commercial question on any renovation, and it is decided by a short paragraph stating what the contractor is deemed to have satisfied itself about. On a new building the unknowns are in the ground. On a renovation they are in every wall, ceiling and riser.
Why as built drawings are not evidence
Most renovation projects start with a set of as built drawings, and most owners treat them as a description of the building.
They are a description of the building as somebody recorded it, usually at completion, frequently from the design drawings rather than from measurement, and then not updated through twenty or thirty years of tenant fit outs, system replacements and repairs that nobody documented.
The commonest errors are not small. Structural members that are not where they are shown. Risers that were abandoned and re routed. Slab thicknesses different from the record. Services running through walls that the drawings show as solid. Fire separations that were breached and never repaired.
A contractor pricing from as built drawings prices what is drawn. When the reality differs, the question is who carries it, and that is answered by the contract rather than by the drawing.
Which is why the clause is more important than the drawing set, and why a renovation contract needs reading differently from a new build one.
The clause that decides existing conditions risk
The language appears in most renovation contracts and reads approximately as follows: the contractor has examined the site and satisfied itself as to the existing conditions, and no claim will be allowed for conditions that could have been observed.
Three words carry the weight. Examined, satisfied, observed.
Observed is the one that matters. A pre bid walkthrough establishes what is visible. It does not establish what is behind a finished wall, above a hard ceiling or inside a chase, because opening those up is not available to a bidder.
So the clause, read fairly, transfers the visible and leaves the concealed with the owner. Read aggressively by an owner, it purports to transfer everything, and that reading tends not to survive.
The honest position is to say so in the contract. List what the contractor is deemed to have observed. State that concealed conditions differing from the documents are treated as a change. Then price the concealed exposure rather than pretending it has been transferred.
What a pre bid investigation actually buys
Opening up selected locations before tender is the single highest return activity on a renovation project, and it is routinely skipped because it costs money before the project is approved.
A typical exercise opens perhaps fifteen to twenty five locations: representative wall types, ceiling voids, risers, slab penetrations, structural connections and the areas around any planned major intervention.
What it produces is not certainty. It produces a sample, and a sample turns an unknown into a probability with a range attached.
The commercial effect is larger than the information. A bidder pricing a building with fifteen documented openings prices what it can see. A bidder pricing the same building with no investigation prices the risk, and the risk premium is invariably larger than the cost of the investigation.
On a $20 million renovation, an investigation costing $60,000 to $120,000 routinely removes more than that from the bid spread, before it removes anything from the change orders.
It also produces something less tangible and equally valuable: it tells the design team what it is designing into, which reduces the coordination changes that arrive later as the drawings meet the building.
A worked example
Illustrative figures. Not taken from any client project and not a quotation.
A 118,000 square foot office renovation in a building from the late 1970s, converted to a mixed tenancy. Contract value $23 million.
No pre bid investigation is carried out. The contract carries the standard satisfied itself clause and the as built drawings are attached for information only.
Over fourteen months the project produces existing condition changes of $2.6 million across four categories. Structural framing differing from the record at eleven locations, requiring redesign of the new openings. Abandoned services in walls shown as clear. Fire separations breached historically and requiring remediation to obtain approval. And slab conditions preventing the planned floor build up over roughly a third of the area.
All four were concealed, none was observable at a walkthrough, and the owner carried all four.
An investigation program of roughly $90,000 would have found three of the four, priced them into the competitive tender, and removed the design rework that followed each discovery.
The fourth, the fire separations, would have been found by a different exercise: a code review of the existing building, which is its own item and is frequently the larger one.
The code trap on renovation work
The second large exposure on a renovation is not physical at all. It is regulatory.
Work above a certain threshold frequently triggers upgrade requirements for parts of the building that were not in the project scope: accessibility, fire alarm coverage, sprinkler extension, egress widths, structural review for seismic conditions in some jurisdictions.
Those requirements are not discovered by opening walls. They are discovered by a code review, and they are discovered by the authority having jurisdiction if nobody does one first.
The commercial problem is timing. A sprinkler upgrade requirement identified at permit review, after the price is fixed, is a change order priced without competition. The same requirement identified before tender is scope in the documents.
A code review of the existing building against the planned work costs a fraction of one percent of a renovation budget and is the closest thing to a free option available on this building type.
It also interacts with phasing, because upgrades required in occupied areas produce the access and disruption problems described in phasing a working building.
How to price what remains
After investigation and code review, some exposure remains and it should be carried deliberately rather than hidden in a percentage.
Three instruments work better than a general contingency.
Unit rates for the predictable discoveries: removal of abandoned services per linear foot, structural remediation per connection, slab repair per square foot. Agreed at signature, competitive, and they convert a discovery into arithmetic.
A named allowance for concealed conditions, with a scope description and a reconciliation mechanism, which is a different instrument from contingency and behaves differently at closeout.
And an owner contingency sized against the specific categories the investigation could not reach, rather than as a percentage of contract value.
The difference between these and a single contingency line is that each one is attached to something identifiable, which means it can be tracked, questioned and released. A percentage cannot. The same argument applies to contingency generally, as in how much contingency is enough.
There is a sequencing point as well. Discoveries on a renovation arrive in the demolition phase, which is early, and they arrive all at once. An owner that has its unit rates agreed and its allowance defined before demolition starts can absorb thirty findings in six weeks without a negotiation for each one.
An owner without them spends the same six weeks pricing thirty change orders while the trades wait, and the schedule consequence is usually worse than the cost.
What we do
We read the existing conditions clause for what it actually transfers, specify the investigation program against where the exposure is concentrated, and price the concealed risk that remains. The code review is run in parallel, because on most renovations the regulatory exposure is larger than the physical one. That work is part of the constructability and interface review. Where an owner’s representative carries this reading, support for owner’s representatives does the reading while they keep the relationship.
Questions people ask
Can existing conditions risk be transferred to the contractor?
Partly, and at a price that is usually poor value. A contractor asked to carry concealed conditions in a fifty year old building will either price a large allowance or qualify the transfer away. Where a genuine transfer is achieved, the premium is generally higher than the expected cost of the risk.
How many openings are enough?
Enough to sample each condition type rather than to survey the building. Fifteen to twenty five locations covering representative wall types, ceilings, risers and the areas of major intervention is typical. What matters more than the count is whether the locations were chosen against the planned work.
Is a laser scan a substitute for opening up?
No, although it is valuable for what it does. A scan records visible geometry accurately, which resolves dimensional questions and helps coordination. It cannot see inside a wall or above a hard ceiling, which is where the expensive discoveries live on almost every renovation.
This is general information about construction contracts and is not legal advice.