Why deferred submittals exist
Some design work literally cannot be finished at permit time because it depends on which contractor wins the job: sprinkler layouts depend on the sprinkler contractor's system design, truss engineering on the fabricator's plates and profiles, curtain wall anchorage on the manufacturer's system. Rather than hold the entire permit for them, the code allows those defined portions to follow — deferred, not skipped. The permit set lists exactly which portions are deferred; adding scopes to that list later requires the building official's blessing.
The double review chain
Deferred submittals run a longer gauntlet than ordinary submittals, and the order matters:
- The specialty contractor's licensed engineer designs and seals the package (delegated design)
- The design professional of record (architect or EOR) reviews it for general conformance with the building design and forwards it with a notation to that effect — the code requires this step before the city sees it
- The building department reviews and approves, sometimes with fire-marshal review in parallel for life-safety scopes
- Only then may the deferred work be installed — inspectors check for the approved deferred package on site
The usual suspects
Scopes that ride the deferred list on most commercial projects:
- Fire sprinkler and fire alarm systems (NFPA 13 / NFPA 72 working drawings and calcs)
- Pre-engineered wood or steel trusses and joists
- Curtain wall, storefront, and window-wall systems
- Prefabricated stairs and railings
- Seismic bracing and anchorage of MEP equipment and distribution
- Storage racks, canopies, PV systems, and signage on many jobs
Managing the schedule risk
Deferred submittals concentrate risk at the worst point in the schedule: they arrive mid-construction, need engineering, EOR review, and city review in series, and their scopes (sprinkler mains, trusses) sit early in the build sequence. Treat each deferred item as a mini-permit with its own timeline — start the specialty engineering at buyout, track the package in the same register as ordinary submittals with the city leg explicitly shown, and never let 'it's deferred' translate into 'it's later.' Deferred means the review moved; the install date didn't.
Budget the review durations realistically: the specialty engineer's design takes weeks, the EOR's conformance review runs on the normal submittal clock, and municipal plan review is whatever your jurisdiction's counter says it is — commonly two to six weeks, longer in busy markets. Chain those in series from the required install date backward and you get the real start date for the engineering, which on truss and sprinkler scopes is frequently the week after contract award.