Multifamily construction schedules are consistently optimistic, a pattern so reliable that experienced construction lenders apply an automatic mental adjustment when reviewing schedules submitted as part of loan applications. The GC who prepared the schedule estimated durations based on ideal conditions; the developer who reviewed it didn’t have the construction management experience to challenge the optimistic assumptions; and the lender who underwrote the loan sized the interest reserve based on a timeline that would have been aggressive even if everything had gone right.
This is not a criticism of anyone’s intentions. Construction scheduling involves genuine uncertainty, and the pressure of a loan application creates incentives to present the most favorable timeline that can be defended. Understanding where schedules are systematically optimistic, and what a realistic schedule looks like for different project types in different markets, gives developers and lenders the tools to underwrite with appropriate conservatism.
The Permitting Phase: The Most Underestimated Variable
The most commonly underestimated phase in a multifamily development timeline is permitting, the time between submitting the building permit application and receiving the permit that allows construction to begin. Developers who have not built in a specific city before routinely underestimate this phase by 30% to 100%, producing financial models that assume construction begins two to four months before it actually can.
The realistic current permitting timelines for multifamily projects vary dramatically by market. Austin’s building department review for commercial multifamily runs 6 to 12 months in current conditions. Seattle’s runs 9 to 15 months for mid-rise projects. Dallas and Phoenix review in 3 to 6 months for well-prepared applications. El Paso and most secondary markets review in 2 to 4 months. These are realistic medians, not worst cases.
Adding the pre-permitting entitlement timeline, SEPA in Washington, design review in Seattle and Scottsdale, PD rezoning in Dallas, extends the total pre-construction timeline further. A Seattle mid-rise project that requires design review (12 to 18 months) plus building permit review (9 to 15 months) can have 24 to 33 months of pre-construction entitlement and permitting before a shovel breaks ground. A Dallas project that is by-right and requires only building permit review can begin construction 4 to 6 months after design is complete.
The Construction Phase: Trade-by-Trade Duration Realities
Within the construction phase, specific trade sequences are most commonly underestimated:
Subcontractor mobilization lag. The time between executing subcontracts and having subcontractor crews actively working is consistently longer than schedules assume, typically two to four weeks per subcontractor, sometimes longer for specialty trades whose crews are deployed on other projects. A schedule that shows the framing subcontractor beginning work the week after the subcontract is executed has not accounted for the mobilization period that precedes productive framing work.
MEP rough-in duration. The mechanical, electrical, and plumbing rough-in phase, the period when MEP systems are installed in the framing before drywall, is consistently underestimated because it involves three separate trades working in a confined space with sequencing dependencies between them. A schedule that shows MEP rough-in completing in six weeks on a 100-unit building when the typical duration for that scope is ten to fourteen weeks will require a revision when the MEP rough-in is still ongoing at week eight.
Inspection hold points. In markets with constrained building department inspection capacity, Austin, Seattle, Denver, waiting for inspection appointments at each phase of construction (framing, MEP rough-in, insulation, drywall) can add two to four weeks per inspection hold point. A project that progresses through four major inspection phases in Austin, each requiring a two-week wait for an inspection appointment, has eight weeks of unavoidable schedule that a schedule prepared without Austin inspection experience will not reflect.
Elevator delivery. Elevators are long-lead equipment, typically 14 to 20 weeks from submittal approval to delivery. Projects that do not submit elevator shop drawings during the design phase, before permits are issued, will receive elevator equipment after the installation window has passed, delaying certificate of occupancy.
Market-Specific Schedule Variables
Pacific Northwest (Seattle, Bellevue, Tacoma). Sound Transit coordination requirements for projects near the light rail alignment add schedule uncertainty that is specific to the Puget Sound. Building department inspection delays in Seattle add 6 to 10 weeks of inspection hold point time to a typical mid-rise schedule. The maritime climate allows year-round exterior work, which is a genuine schedule advantage relative to continental climate markets.
Texas. Summer heat (June through September) reduces exterior work productivity on all Texas projects. The reduction is not dramatic for most trades but is real, a 10% to 15% productivity reduction on exterior work during peak summer months should be reflected in summer schedule durations. Houston’s Gulf Coast location adds hurricane season risk to projects active between June and November.
Arizona. Monsoon season (mid-June through mid-September) creates flash flood risk and occasional work stoppages. Summer heat creates concrete management requirements that affect pour scheduling. Projects with August delivery deadlines, student housing near the University of Arizona, have a hard constraint that the schedule must be built backwards from rather than estimated forward.
Colorado. The winter construction season (November through March) creates real constraints on exterior work at Front Range elevations. A Denver or Colorado Springs project whose schedule assumes winter exterior production at the same rate as summer production will need revision after the first winter.
Stress-Testing the Schedule
Before the construction loan closes, the schedule should be stress-tested against two scenarios: a three-month extension and a six-month extension. The stress test should calculate the additional interest reserve consumed by each extension, compare the extended completion date to the project’s permanent financing requirements, and assess whether the borrower has the financial capacity to manage the carrying cost of the extended timeline.
If a three-month schedule extension would deprive the project of adequate interest reserve, the reserve was sized too tightly for a project of this complexity in this market.
For a complete treatment of this topic, see our guide to construction management: the complete guide for developers and owners. Innergy Integral provides these services in Seattle, WA and across our six-state footprint.
Related: Multifamily Development Services · Construction Loan Interest Reserve · Construction Schedule Management · Development Advisory Guide
Markets: Multifamily Development Seattle WA · Multifamily Development Austin TX · Multifamily Development Denver CO