Interior window trim typically costs $150-$600 per window installed, with an average near $325 for standard casing, labor, and basic finish work. Interior window trim cost depends on window size, wood or composite material, removal of old trim, painting, and local carpenter rates.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Installed trim per window | $150 | $325 | $600 | Standard opening and profile |
| Trim material per window | $25 | $75 | $180 | Primed MDF to hardwood |
| Labor per window | $100 | $225 | $420 | Fit, attach, caulk, and finish |
| Installed price per linear foot | $6 | $12 | $22 | Varies with material and detail |
| Removal and disposal | $20 | $55 | $120 | Per opening, before wall repairs |
What standard interior window trim costs per opening
For a typical 3-by-5-foot window with straightforward access, expect $150-$400 for basic primed MDF or finger-jointed pine trim installed. The average job is about $325 per window when it includes measuring, cutting, fastening, caulking, and minor touch-up. Larger openings, premium wood, detailed profiles, or full repainting can bring the total to $400-$600 or more.
For several standard windows, a practical starting budget is $250-$400 per opening. Assumptions: standard-size openings, midrange U.S. labor, ordinary access, and no major drywall or framing repairs. Per-linear-foot rates are useful for comparing quotes, but per-window totals better account for cuts, corners, and setup time.
How casing, sill, and labor show up in a trim quote
A quote may price materials and labor together or list each task separately. The ranges below reflect a common single-window replacement with roughly 20-25 linear feet of casing and a standard sill; they are not add-on amounts for every project.
| Quote component | Low | Average | High | Typical scope |
|---|---|---|---|---|
| Casing and head trim | $20 | $55 | $130 | MDF, pine, or hardwood |
| Sill and apron | $10 | $35 | $90 | Simple stool and apron |
| Installation labor | $100 | $225 | $420 | Measure, cut, fit, and fasten |
| Caulk, fasteners, and filler | $8 | $20 | $45 | Consumables per opening |
| Paint or stain finish | $25 | $65 | $160 | One opening; finish quality varies |
Carpenter rates commonly run $50-$100 per hour, with a minimum service charge of about $150-$300 possible for small jobs. Confirm whether painting, old-trim removal, and disposal are included before comparing totals.
How window size and trim material change the estimate
Material is a major price lever. Primed MDF usually costs about $1-$4 per linear foot, finger-jointed pine $2-$6, solid poplar $4-$10, and stain-grade oak or similar hardwood $6-$16. These are material prices; finish-grade lumber can cost more, particularly when the profile is custom.
Window dimensions also affect labor and waste. A window with 20-25 linear feet of casing is usually a simpler job than a large picture window requiring 35-50 feet, heavier stock, or extra joints. Expect roughly 15%-35% higher installed pricing for a large opening or premium hardwood profile. Bay windows and arched openings often require custom cuts and can exceed $600 per opening.
Existing conditions matter as much as dimensions. Uneven walls, out-of-square frames, damaged drywall, or deep jambs may require shimming, scribing, or repair. Ask whether the estimate assumes the window frame is sound and the surrounding wall needs no patching.
Can existing casing be repaired instead of replaced?
When trim is intact and firmly attached, filling nail holes, caulking gaps, and repainting may cost $50-$175 per window if included in a larger painting visit. A standalone service call can cost more because of minimum charges. Replacing one damaged casing piece may run $100-$250, depending on profile matching and paint work.
Full replacement is more likely to make sense when several pieces are split, water-damaged, loose, or difficult to match. Repair can save money when damage is limited to a small area and the existing profile is still available. If moisture caused swelling or rot, the source should be fixed before installing new trim.
What removal and repainting add to installation price
Removing old casing typically adds $20-$120 per window for careful removal and disposal. It may cost more if trim is glued, layered, or likely to damage plaster or drywall. Wall patching and sanding can add $50-$200 per opening; extensive repairs should be priced separately rather than treated as routine trim work.
Painting new trim often adds $25-$160 per window, depending on whether the contractor primes and paints in place, applies multiple coats, or matches a detailed finish. Staining hardwood usually requires more preparation than painting primed stock. Ask whether the finish price covers both the trim and any wall touch-ups.
How long a carpenter needs for each window
A carpenter may spend 1.5-3 hours fitting simple casing and a sill on a standard opening. Removal, difficult corners, custom profiles, or uneven walls can raise labor time to 3-5 hours per window. Painting may be completed by another trade or scheduled as a separate visit, which affects the total calendar time.
For a multi-window project, setup and material staging are shared, so the per-window rate may fall compared with hiring for one opening. Labor estimates should state the number of openings and whether the crew will make on-site cuts and finish work.
Three sample quotes for common window trim jobs
| Job | Scope | Estimated total | Approximate rate |
|---|---|---|---|
| Basic replacement | One 3-by-5-foot window, MDF casing, 2.5 labor hours | $240-$390 | $10-$16 per linear foot |
| Hardwood upgrade | One standard window, poplar casing and sill, stain finish | $400-$650 | $16-$26 per linear foot |
| Multi-window project | Eight standard windows, primed pine, repaint included | $1,800-$3,200 | $225-$400 per window |
These examples assume ordinary access and no structural repairs. Regional labor, paint requirements, and profile selection can shift the quote; a single opening may also carry a higher minimum charge than a whole-home project.
How standard profiles and grouped work lower trim cost
Choosing stock MDF or pine profiles instead of custom millwork limits material expense and cutting time. Keeping existing trim where it is sound, selecting a paint-grade finish, and handling simple room clearing before the crew arrives can also reduce billed labor. For several openings, grouping the work into one visit may avoid repeated minimum charges.
Compare at least two written quotes using the same window count, material, removal scope, and finish standard. Avoid choosing a lower total until it is clear whether disposal, caulk, paint, and wall repair are excluded. A quote with a slightly higher rate may be more complete if it covers those tasks.