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Introduction #
Stock trim material means one casing profile and one baseboard profile, run the same way through every unit in an apartment or multifamily building, instead of the room-by-room custom selections you would see on a single-family house. The carpentry itself is the same skill as any other trim job: the same reveal, the same fastening, the same joints, the same trim and moulding fundamentals either way. What changes is the scale and the repetition, and the habits that make repetition fast are the difference between a profitable multifamily job and a slow one.
This guide covers installing stock trim material across an apartment unit, or a run of identical units, building on the sequence in How to Trim a House. If you have not read that guide, start there; this one only covers what is different about production, stock-material work in a multifamily setting.
Before You Begin #
Prerequisites #
- Drywall is complete and primed in the unit or units you are trimming
- You have confirmed the single stock casing and baseboard profile for the whole building, not just the unit in front of you
- You know whether the unit entry door was already hung before drywall. Apartment unit entry doors are the one interior door type that sometimes goes in before drywall, unlike standard interior doors on a single-family house, so confirm its status before you plan your casing work at that opening
- Material is staged by unit or by floor, sorted and ready, not just delivered in one undifferentiated pile
What You Need To Know #
- One profile, every unit. Confirm the casing and baseboard profile before you cut the first piece, and flag any mismatch in a delivery immediately; a wrong profile that gets installed in even one unit before you catch it means redoing that unit's work
- Set up your jigs once, use them everywhere. Build your story pole and set your miter saw stop block from the first unit's dimensions, then reuse that same setup across every identical unit rather than re-measuring from scratch each time
- Work each unit in the same order you would a house: doors first, then casing, then baseboard last, per the sequence in How to Trim a House. Do not skip around within a unit just because the units themselves are repetitive
- Not every unit is identical. Corner units, ADA units, and end units often have a different floor plan even in a building that looks uniform from the outside. Confirm floor plan type before you assume your jig settings carry over
- Track production by unit, not just by the job as a whole. Knowing how long one unit takes lets you flag a shortage or a schedule problem while there is still time to fix it, instead of finding out on the last unit
Tools Required #
Power Tools #
- Miter saw: your main saw, set up centrally to serve a cluster of nearby units
- 15-gauge finish nailer: for door jambs and main fastening
- 18-gauge brad nailer: for casing and baseboard, 1-3/4" brads
- Compressor, plus a battery backup for units where hose reach is a problem
Hand Tools #
- Tape measure
- 6-foot level: for checking door jambs plumb
- Combination square: for setting the casing reveal
- Coping saw: for baseboard inside corners
Supplies #
- Wood glue: for every miter
- 15-gauge finish nails and 18-gauge brads, matched to the stock profile's thickness
- Shims
Materials #
- The building's single stock casing profile, per unit and per door schedule
- The building's single stock baseboard profile, per linear footage across the unit
- Base shoe, if the plans call for it, staged the same as on any other job
How to Install Stock Trim Material Step by Step #
Step 1: Confirm the Profile for the Whole Building #
Before cutting anything, confirm the delivered material matches the plans for the whole building, not just the unit you are standing in. Catching a wrong profile on day one, while the supplier can still correct the order, saves you from redoing finished units later.
Step 2: Set Up a Central Cut Station #
Set your miter saw up to serve a cluster of nearby units rather than carrying material long distances. On a multi-unit floor, this usually means one saw setup per hallway or per few units, moved as you finish a cluster and start the next.
Step 3: Build Your Jigs from the First Unit #
Trim the first unit of a given floor plan carefully, and use it to set your story pole for casing reveals and your stop block for repeat baseboard and casing lengths. Confirm the fit is correct in that first unit before you carry the same settings into every other identical unit.
Step 4: Hang Doors, Confirming Entry Door Status #
Hang the interior doors in the unit first, same as any other trim job. If the unit entry door was already installed before drywall, as apartment entry doors sometimes are, confirm its jamb and reveal are still good rather than assuming it needs the same work as an interior door hung fresh during this trim phase.
Step 5: Case the Openings #
Case every door and window opening using the reveal you set with your story pole in Step 3. Batch your cuts: measure and cut all the legs and headers for the unit in one pass at the saw rather than making one trip per opening.
Step 6: Install Baseboard Last #
Baseboard goes in last in the unit, the same order as a single-family house. Cope inside corners, miter and glue outside corners, and butt square into door casing at every opening.
Step 7: Move to the Next Unit #
Once a unit passes its own quality check, move to the next identical unit and reuse the jigs and settings from Step 3. Track each completed unit on your production log before moving on.
Close-Out #
Sweep every unit before you move to the next one; do not shop vac. Stage any leftover stock centrally where it is easy to find for the next unit rather than leaving partial bundles scattered through the building. Log each finished unit on your production tracker so the crew knows what is left.
Quality Check #
- Casing profile and baseboard profile match the building standard in every unit
- Reveal is consistent at 3/16" throughout the unit
- All doors operate smoothly with no rubbing or bound hinges
- All miter joints are tight and glued
- Baseboard sits flat against the wall with no bowing
- Entry door status (pre-drywall vs. hung this phase) was confirmed, not assumed
- Unit is swept clean and logged as complete
Troubleshooting #
Profile runs out partway through the building #
Order more immediately and keep working on units that do not need the short material: closets, other rooms, or units with a different floor plan. Never substitute a close-but-different profile; it will be visible once units are compared side by side.
A unit does not match the floor plan you jigged for #
Stop and re-measure that unit before assuming your story pole and stop block settings apply. Corner units, ADA units, and end units often differ even in a building that looks uniform.
Falling behind pace on later units #
Compare your per-unit time against your early units using your production log. A slowdown usually traces back to a broken batching habit: walking too far to the saw, or mixing task types instead of finishing one task across several units before moving to the next.
