Substantial Completion, Retainage, and the HVAC Failure

Substantial completion turns on whether the owner can use the property for its intended purpose, not on a clean punch list. Twenty occupied units, furniture moving in, and a temporary certificate of occupancy are strong evidence the building was usable on May 1. Missing balcony door hardware and an unfinished water heater make the work incomplete in part but do not defeat substantial completion of the whole.

Why the date matters:

• The lien clock. A subcontractor's lien must be recorded by the earlier of 90 days after completion (July 30 here) or 30 days after a Notice of Completion is recorded. No NOC was recorded, so the 90-day date controls.
• The mechanical sub's lien. Recorded August 30, it is probably late by about a month, so the sub's remedy collapses to a contract claim against Dovetail, where the sub will argue that the 140 open items mean the work of improvement was not complete until later. That is a fact question, and occupancy cuts against the sub.
• Dovetail's own position. Dovetail is exposed to the sub's contract claim regardless of the lien outcome.

Protect the record now: send a written notice of substantial completion with the punch list and a stated date, and demand the owner's written acceptance or rejection so the completion date is fixed by contemporaneous documents rather than by later litigation.

Retainage is not a lever the owner can hold indefinitely. Under California retention law the owner may withhold retainage only up to the statutory percentage and may not use it as security for general dissatisfaction; the legitimate hold is limited to the reasonable cost to complete or correct the remaining items, commonly capped at roughly 150% of the estimated cost to finish.

Apply that arithmetic. Have Dovetail price the open items, for example $22,000 for door hardware, the water heater, and the balance of the punch list plus a reasonable contingency. The owner's defensible hold is in that range, not $186,000.

Steps:

• Deliver a written demand for final payment with a line-item cost-to-complete and a conditional release limited to the amount actually due.
• Offer the owner a defined holdback, an escrow, or a surety bond covering the punch list, so the owner's risk is secured without freezing the entire retention.
• Check the contract's final payment and retention clauses and the statutory interest and attorney fee provisions for improper withholding, and confirm the current Civil Code retention sections before citing a figure in correspondence.
• Do not sign an unconditional release just to get paid, and do not let the owner set off the disputed $44,000 water damage against retention without documentation.

Acceptance does not waive latent defects, and a warranty does not require the owner to give up a claim. The controlling question is causation, and it determines who pays:

• If the failure came from installation by Dovetail or the mechanical sub, the workmanship warranty and Dovetail's responsibility to the owner control.
• If the failure is an equipment defect, the manufacturer's warranty and the supplier enter the chain, but Dovetail remains the owner's single point of responsibility.

First week actions:

1. Preserve the failed unit, photographs, and the maintenance log. Do not let the sub remove the equipment.
2. Retain a cause-and-origin consultant. The claim is large enough to justify the fee and small enough that the owner may net it against retention unilaterally.
3. Tender to the mechanical sub for defense and indemnity and to its carrier.
4. Repair the damage promptly and document the cost, since delay inflates the claim.
5. Present the damage claim and the retention demand in one written package, so the owner cannot quietly set off an undocumented loss against money that is otherwise due. From a closeout standpoint, the punch list, the retention release, and the warranty claim should be closed in a single final payment and release package, not three separate fights.