A punch list is the itemized record of work that remains incomplete, defective, or damaged when a construction project reaches substantial completion. Known as a snag list in the UK, it names each item, its location, and the party responsible for putting it right before the final payment is released.
The document looks humble. A spreadsheet, a few hundred rows, a column of room numbers. Yet it sits where a building stops being a construction site and starts being a property, and that handover carries money, insurance, and warranty consequences that studio never covers.
When Is a Punch List Prepared?
It is prepared when the contractor believes the work has reached the point where the owner can occupy and use it for its intended purpose. On larger jobs this rarely happens once. Teams run rolling lists zone by zone, closing out finished areas while other trades still work, which keeps the final walk from becoming a thousand-line pile-up.
Sequence matters. The contractor normally runs an internal sweep first, a pre-punch, pushing each subcontractor to correct obvious defects before the design team arrives. Only then does the architect walk the building.
💡 Pro Tip
Do not accept a request for a walk until the contractor has cleaned, powered, and lit every space on the route. Inspecting a dark mechanical room by flashlight guarantees a second visit, and second visits turn a two-week closeout into a two-month one.
What Substantial Completion Means in the Contract
Substantial completion is not a compliment about progress. It is a contractual date with consequences, and the list is the attachment that makes that date defensible. The US General Services Administration frames it plainly in its guidance on project completion and closeout: the customer agency may take beneficial occupancy of the space, and items may still remain, provided the space can be used for its intended purpose.
Several things move on that date. Warranty periods begin running, and the contractor's builder's risk policy typically ends while the owner's property insurance has to pick up. AIA Contract Documents flags that gap in its note on the overlooked realities of substantial completion, along with the release of most retainage and the transfer of security and utility costs.
📐 Technical Note
On US projects the date is usually recorded on AIA Document G704–2017, the Certificate of Substantial Completion. The contractor prepares the list of items to be completed or corrected, the architect verifies and amends it, and that list is attached to the certificate. The form also fixes the time allowed for finishing those items and states that warranties commence on the date of substantial completion unless the parties agree otherwise.
Punch List vs Snag List: What Changes Across the Atlantic
The two terms describe the same activity, but the contracts around them behave differently. In the UK the equivalent milestone is practical completion, and the snag list occupies a stranger position. The Joint Contracts Tribunal notes in its guidance on practical completion that snagging lists are not a contractual requirement under its SBC and DB forms, and that they are often, and sometimes inappropriately, produced to establish what must be done to reach it.
The practical difference is what happens next. A US punch list is cleared before final completion and final payment. A UK snag list feeds into a rectification period, commonly twelve months, during which the contractor returns to make good defects that appear after handover.
At a Glance: Punch List vs Snag List
| Aspect | Punch list (US practice) | Snag list (UK practice) |
|---|---|---|
| Milestone it attaches to | Substantial completion | Practical completion |
| Contractual status | Attached to the certificate | Not required by JCT forms |
| Who drafts it first | Contractor, verified by architect | Contract administrator or client surveyor |
| Correction window | Time agreed on the certificate | Rectification period, often 12 months |
| Money it releases | Most retainage, then final payment | Part of retention, balance after rectification |
Who Prepares the Punch List?
Three parties touch it. The contractor drafts the first version and carries responsibility for the work, since every line traces back to a subcontract. The architect inspects, verifies, and amends, the role the AIA certificate assigns, and that review keeps the list from being a self-graded exam. The owner adds observations, usually about finishes and equipment they will live with daily.
A fourth voice appears on complex buildings. Commissioning agents and the reviewers who checked coordination during design, including anyone who ran clash detection in BIM, produce their own findings for systems that only reveal themselves once everything runs.
⚠️ Common Mistake to Avoid
Owners and junior architects often use the walk to request work that was never in the contract, then wonder why the contractor stalls. A punch list corrects work against the contract documents. Anything beyond that scope is a change order with its own price and time, and mixing the two destroys the credibility of the list.
How Punch List Items Are Classified
Sorting items by type decides who pays, so classify before the list is issued rather than after it is disputed.
- Incomplete work: contracted scope that was never finished, such as a missing door closer or an unpainted soffit.
- Defective work: work that exists but does not meet the drawings or specifications. Judge it against the detail drawings, not personal taste.
- Damage: work that was correct and was then harmed by a following trade, a delivery, or early occupancy. These are the items that turn into arguments about responsibility.
- Life safety items: unsealed penetrations through a fire-rated wall, blocked egress hardware, missing signage. Track these separately, because occupancy can depend on them.
How Many Punch Items Are Acceptable?
There is no published threshold, and anyone quoting a fixed number per square metre is inventing it. What matters is the ratio of minor to substantive items. A long list of paint touch-ups on a large fit-out is normal and often shows a thorough inspector. A short list holding three mechanical systems that will not balance is a far worse position.
Read the list as a comment on supervision. If one defect repeats across forty rooms, the problem is not the rooms.
How to Run a Punch Walk
A punch walk is the physical inspection that produces the list. Work through the building on a fixed route, room by room, in the same direction every time so nothing is skipped. Record each item with four pieces of information: the location, a description precise enough to act on, the responsible party, and the date raised.
Description quality decides whether an item gets fixed on the first attempt. "Damaged wall" tells a subcontractor nothing. "Gypsum board dented at 1.2 m above floor, left of door 3-114, north wall" sends a worker to the right spot with the right material. Back-checking is the other half: every closed item needs verification by whoever raised it, not a tick from whoever repaired it.
💡 Pro Tip
Photograph every item with something identifiable in frame: a door tag, a room number, a column line. Cropped close-ups of damaged plaster all look alike three weeks later, and an unlocatable photo becomes an item nobody closes.
Digital Punch List Tools and Photo Records
Field software has largely replaced the clipboard. The useful feature is not the checklist, it is the pin: each item is dropped on a floor plan or model view so its location is unambiguous, then carries its photos, assigned subcontractor, and status history with it. Items sync when the device reaches signal, which matters in cores and basements.
Two habits keep the software honest: assign every item to a named company, never to "GC", and require a verification photo at closure. If you build your own tracking sheets instead, the essentials for architects collection covers the documentation side of practice that studio courses skip.
Final Completion, Retainage, and the Last Payment
Final completion arrives when every item is closed and verified, and it is a separate event from substantial completion. AIA Contract Documents publishes certificates for substantial completion but no equivalent final completion form, so the closeout package is assembled from the contract's own requirements.
That package normally includes the final application for payment, lien waivers, warranties, as-built drawings, operation and maintenance manuals, and training records. The remaining retainage is released against it, which is why a vague list is expensive: money sits unpaid while people argue over whether an item was closed.
What This Means for Your Next Project
Your Next Step: before your next site visit, fix the four fields you will capture for every item, location, description, responsible party, date raised, and refuse to record anything missing one of them. A list whose lines can be acted on without a phone call beats one three times its length.
Procedures for substantial completion, retainage, and defect correction vary by contract form and jurisdiction. Verify the terms of your own agreement with a qualified professional.
Frequently Asked Questions
Is a Punch List Legally Binding?
The list itself is a record, not a contract. It becomes enforceable through the document it attaches to, such as a certificate of substantial completion that fixes the time allowed for correcting the listed items.
What Is the Difference Between a Punch List and a Snag List?
They describe the same inspection in US and UK terminology. The difference is the surrounding contract: a punch list is cleared before final payment, while a UK snag list feeds into a rectification period after practical completion.
Who Pays for Punch List Work?
The contractor absorbs incomplete and defective work, since both sit inside the contract sum. Damage caused by a specific trade is charged back to that subcontractor. Anything the owner adds beyond the contracted scope is a change order, paid separately.
How Long Does a Contractor Have to Finish the Punch List?
There is no universal period. The time allowed is written into the completion certificate or agreed by the parties. If the deadline passes, the owner's remedy is usually to withhold a sum tied to the value of the outstanding work.
Does Substantial Completion Mean the Building Is Finished?
No. It means the owner can occupy and use the space for its intended purpose while listed items are still outstanding. Warranty periods and insurance responsibilities shift on that date even though work continues, which is why the attached list has to be accurate.
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