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Finishes

Trim

In Plain English

All the decorative and functional wood pieces that frame doors, windows, and wall transitions.

Definition

Trim is the collective term for all finish carpentry moldings and boards used to complete interior and exterior surfaces, including baseboards, casings, crown molding, chair rails, and door and window surrounds. Trim conceals gaps between building components, protects edges from damage, and adds architectural detail. It is specified by profile, material, size, and finish on the construction drawings.

Why It Matters in Bidding

Trim is one of the most labor-intensive line items in finish carpentry, and quantities are easy to underestimate because they follow every door, window, and wall transition rather than gross square footage. Bidders must price by linear foot of each profile, account for miter waste and material grade, and confirm whether painting or staining is in their scope or the painter's.

Example

An estimator doing a takeoff on a 40-unit apartment building counts 1,200 linear feet of base, casing, and crown per floor, applies a 10% waste factor, and prices it as a separate finish-carpentry line so the GC can compare against the millwork sub's quote.

Related Terms

BaseboardCrown MoldingMillworkCaulk

Related Tools & Templates

Interior Finish Schedule

Frequently Asked Questions

Measure linear footage of each profile separately—base along wall perimeters, casing around door and window openings, crown around ceiling perimeters—then add a waste factor, typically 10 to 15 percent for miter cuts and defects. Group by material and finish so labor and material rates can be applied accurately to each type.
Scope language determines this. Finish carpenters usually install bare or primed trim, while the painting subcontractor handles fill, caulk, and finish coats. Estimators should read the spec division and scope letters carefully, because an unclear handoff often leaves caulking or touch-up unpriced and creates a gap discovered during punch list.
Profile complexity, material, and finish drive cost more than length alone. Paint-grade MDF runs cheaper than stain-grade hardwood, intricate built-up crown takes far more labor than simple base, and prefinished pieces shift cost between trades. Job conditions like high ceilings or curved walls also raise installation labor significantly.

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