Window Trim Replacement Cost in 2026 (Per Window + Rot)

The pry bar went behind the casing on the second-floor bedroom window and the whole bottom corner came away in my hand like wet cake. I had budgeted a Saturday and one trip to the lumberyard. I got three weekends and a carpenter named Ray who did not laugh at me, which I appreciated.

Window trim replacement cost in 2026 runs about $6 to $14 per linear foot installed on the inside and $9 to $25 per linear foot on the outside, which lands most single windows between $110 and $400. What moves that number is rot, and rot stays invisible until the first piece comes off.

Jump to what you need:

What it costs in 2026
Inside and outside are two different jobs
Wood, PVC, composite, or clad
The rot you find after the first piece comes off
If your house predates 1978
Can you cut the cost yourself?
What belongs on the estimate
What eight windows actually cost me
FAQ

Table of Contents

What does window trim replacement cost in 2026?

A standard double-hung window, call it 3 feet by 5 feet, needs roughly 16 linear feet of casing to go around it. That is the unit everybody quotes in, and it is why two windows in the same house can be priced $200 apart.

Inside the house, budget $110 to $230 per window installed. It is finish carpentry in a conditioned room with no ladder and no weather, so it is the cheap half.

Outside, budget $150 to $400 per window installed. Same 16 feet, more than double the money. You are paying for ladders or staging, for flashing and caulk that has to actually keep water out, and for the fact that nobody can do exterior trim in the rain.

Add paint if the trim is not pre-finished. Two coats on trim runs $2 to $6 per linear foot, so figure another $35 to $95 per window. My exterior house painting cost breakdown has the per-square-foot version if you are doing the whole house at once, which costs less per foot than doing the trim on its own.

One thing that surprised me: the window itself barely matters to this price. A $1,200 window and a $300 window take the same 16 feet of casing. If you are pricing the glass too, that lives in the window replacement cost guide, and it is a much bigger number.

Interior casing and exterior trim are two different jobs

Contractors know this. Homeowners calling for quotes usually do not, and it is where half the confusion in the estimates comes from.

Interior casing is the flat or molded boards around the opening on the room side, plus the stool (the little shelf you set a candle on) and the apron under it. Pine, poplar, or MDF. It gets nailed, caulked, and painted. Nothing about it is structural and nothing about it keeps water out.

Exterior trim is the brickmould or flat casing, the head trim on top, and the sill. That assembly is part of how the wall sheds water. Get that assembly wrong and the water goes into the sheathing behind it.

So when a bid says “replace window trim, $180,” ask which side. I got two quotes that were $220 apart and spent an evening annoyed about it before I realized one was interior only and the other was both. That was my fault, not theirs.

Pulling interior casing also tends to take a strip of drywall paper with it, especially if the last person caulked the casing to the wall. Budget a tube of compound and an hour of sanding per window, or see drywall repair cost if it goes worse than that. Mine went worse than that on two windows.

Wood, PVC, composite, or clad, and what each one costs

Material moves the exterior window trim replacement cost more than window size does, and it is the part you control.

Trim material	Material only, per linear ft	Installed per window (16 lf)	Realistic life outside	Worth it when
Pine or finger-joint, primed	$2 to $5	$150 to $260	10 to 20 yrs, if painted	Interior, or a covered elevation
Cedar	$4 to $9	$190 to $320	20 to 30 yrs	You want real wood outside and will paint it
Composite (engineered wood)	$3 to $7	$180 to $300	25 to 30 yrs	Best all-round value on a painted house
Cellular PVC	$5 to $11	$230 to $400	30+ yrs, will not rot	Ground-floor, sprinklers, shade, any wet spot
Aluminum capping over existing	$60 to $150 per window	$60 to $150	20 to 30 yrs	Wood underneath is sound and you hate painting
MDF (interior only)	$1.50 to $4	$120 to $210	Indefinite, if it never gets wet	Interior casing on a budget

2026 estimates for a 3 by 5 window needing about 16 linear feet of casing. Ranges move with region, elevation height, paint grade and how much prep the opening needs. Confirm against local bids.

My opinion, and Ray agreed on this one: cellular PVC on the bottom floor and on any elevation that gets sprinkler spray, composite everywhere else. Paying PVC money for a second-story window under a three-foot soffit overhang is buying insurance on a house that will not flood.

Aluminum capping is the sleeper option nobody offers you. If the wood under it is sound, a crew wraps it in coil stock and you never paint that window again. It is also the option that hides rot beautifully for six years, so only do it on trim you have probed.

The rot you find after you pry off the first piece

Rot is why two trim quotes on the same house land $300 apart. No honest carpenter can price the repair until the trim is off, so they either pad the bid or write it as an allowance.

Moisture is the whole story. The National Park Service brief on repairing historic wood windows names moisture as the primary contributing factor in wooden window decay, and notes that deterioration starts on horizontal surfaces and at joints where water can collect. Which is exactly the sill. Every time.

That brief also gives the test I now run before I get a single quote, and it costs nothing. Wet the wood, jab an awl or an ice pick in at an angle, and pry up a sliver. Sound wood lifts in long fibrous splinters. Decayed wood breaks off in short irregular pieces. Then push the pick straight in, perpendicular to the surface, especially on the underside of the sill where you cannot see. A skin of good paint over a punky core will let the probe sink right through, and that is the failure that turns a $250 window into a $900 one.

What the repairs run in 2026:

Consolidation and filling. A semi-rigid epoxy that saturates the decayed wood and hardens, then epoxy patching compound to rebuild the missing edge, sanded and painted. The Park Service documents this exact method for a weathered sill. Figure $80 to $200 per window in labor and product.
Sill replacement. $250 to $600 per window. The sill is pitched and let into the jambs, so this is real carpentry, not a board swap.
Rot into the sheathing or framing. $600 to $1,800. At this point the trim is the last thing anyone is worried about.

Probe every sill before you accept a bid. Ten minutes with an awl turns a surprise into a line item, and a line item is something you can negotiate.

On the exterior, what happens under that trim matters more than the trim itself. Where the casing meets the wall cladding is a joint that has to be flashed and sealed, the same detail my siding replacement cost guide gets into. If a bid never mentions flashing at the head, ask.

If your house predates 1978, stop before you sand

Mine is a 1962, so I looked this up properly rather than guessing, and I am glad I did.

The EPA’s Renovation, Repair and Painting rule says roughly three-quarters of US homes built before 1978 still contain some lead-based paint, and it specifically names window sills as a friction surface where old paint produces chips and dust. Anyone you pay to disturb painted surfaces in a pre-1978 home has to be certified and trained in lead-safe work practices.

Two things worth knowing. First, the rule generally does not apply to a homeowner doing the work in their own pre-1978 home, though it does apply if you rent out any part of it, run a childcare center there, or buy and renovate homes to sell. Second, “does not apply to you” is not the same as “is safe.” Sanding a painted 1962 sill with kids in the house is a bad idea, and I did not do it.

What it does to the bill: expect certified crews to price 10% to 30% higher on older homes, or to add a flat containment setup of $150 to $400 for plastic, tack pads and HEPA cleanup. That gap between two of your bids might not be one contractor gouging you. It might be one contractor being certified and the other one not bringing it up.

Can you cut the window trim replacement cost yourself?

Interior casing, yes, and I would encourage it. It is the friendliest carpentry in the house. You need a miter saw, a brad nailer, caulk and patience with 45-degree cuts that never quite close on an out-of-square opening. Materials for one window run $30 to $70. My first one took two hours and looked fine from six feet, which is where people stand.

If you have ever cased an interior door, this is the same skill set and the same tools. The interior door installation numbers give you a sense of the labor side if you would rather hand it off.

Exterior trim is where I would think hard. The cuts are no harder. A bad joint just stays invisible for four years and then gets expensive. Add a ladder and second-story work and my honest answer is that I did the first floor myself and paid Ray for everything above it.

Carpenter labor runs $60 to $110 an hour in 2026. Budget one to two hours per interior window and two to four per exterior one, which is how you get to the installed ranges above. Those rates swing hard by metro, and my window replacement cost by region breakdown shows how far apart two states can be on an identical job.

What belongs on a window trim replacement cost estimate

Most of the spread between two window trim replacement cost bids comes down to the lines below. A bid you can compare has all of them on it. If yours does not, ask in writing before you sign.

Interior, exterior, or both, per window, with a count.
The material by name and profile, not the word “trim.”
Whether the sill and stool are included or priced separately. They are usually separate.
A named rot allowance, in dollars, and what happens when it is exceeded.
Flashing and caulk at the head and sides, on any exterior work.
Paint: primed only, one coat, or two, and who supplies it.
Lead-safe certification, on any pre-1978 house.
Debris haul-off, and who patches the drywall.

The rot allowance is the one people skip and the one that decides whether the project lands on budget. Ray wrote mine as $150 per window, with anything past it billed at his hourly plus material and approved by text before he did it. Two windows went over. I knew about both within an hour of him finding them.

What eight windows actually cost me

My own window trim replacement cost, itemized. Fall 2025 into 2026, a 1962 ranch in a mid-cost metro. I did the four first-floor interiors, Ray did every exterior and the two upstairs interiors. Your numbers will differ. The pattern probably will not.

Window	Scope	What I found	Trim used	What it cost
Kitchen, north	Interior only, me	Sound, drywall tore	Primed pine	$52 material
Living room, north	Interior only, me	Sound	Primed pine	$61 material
Dining, east	Both sides	Sound	PVC out, pine in	$295
Bed 1, south	Both sides	Sill punky, epoxy	PVC out, pine in	$470
Bed 2, south	Both sides	Sill gone, replaced	PVC out, pine in	$780
Bath, west	Both sides	Sound, sprinkler spray	PVC out, MDF in	$310
Upstairs bed, west	Both, ladder	Sound	Composite out	$340
Upstairs hall, west	Both, ladder	Head trim soft	Composite out	$425

My actual 2025 to 2026 spend on eight windows, materials and labor combined, exterior paint included. Eight windows, $2,733 total. The two south sills were 46% of the money on 25% of the windows. One household’s estimate, not a national average.

Those two south-facing sills ate $1,250 of a $2,733 job. Both had good paint on them. Both failed the perpendicular probe, and I only ran that probe because I had already read the Park Service brief after the first corner crumbled in my hand. Had I tested before getting quotes, I would have known my real budget three weeks earlier.

What blows the trim budget

No rot allowance in the bid. The carpenter finds a soft sill on day two, and now you are negotiating a change order with the wall open and nothing left to argue with. Get the allowance written in dollars up front.
Ordering trim before the openings are measured. Older houses are not square and brickmould profiles are not universal. I ate $40 in returns and a four-day delay because I bought casing for a window I had measured from the inside.
Treating paint as included. Primed is not painted. Two coats on eight windows added $390 to my job, and it sat on a separate line I nearly missed by reading the bid too fast.

Grab my free Project Cost Estimator. Put in your window count, whether you need inside, outside or both, and a rot allowance per opening. You will walk into every bid already knowing your own fair range, which is the whole trick.

Frequently Asked Questions

How much does it cost to replace the trim around one window?
Figure $110 to $230 installed for interior casing and $150 to $400 for exterior trim on a standard 3 by 5 window in 2026, so $260 to $630 if you do both sides. Rot repair sits on top of that: $80 to $200 for epoxy consolidation, $250 to $600 for a sill replacement, and considerably more once the damage reaches the sheathing. Materials alone for a DIY interior job are $30 to $70 per window.

Should I replace window trim or the whole window?
If the sash still operates, the glass is not fogged and only the trim is failing, replacing the trim is a fraction of the cost and the right call. Trim runs $260 to $630 a window; a full replacement window installed is several times that. Replace the window itself when you have failed insulated glass, sash that will not stay up, or rot that has moved out of the trim and into the frame and jambs.

Is PVC trim worth the extra money over wood?
On the ground floor, and anywhere that gets sprinkler spray, deep shade or splashback, yes. Cellular PVC costs roughly $60 to $140 more per window than composite and it will not rot, which is the exact failure you are buying against. Higher up and under a deep overhang, composite or primed cedar does the same job for less. Paying PVC prices on a dry second-story elevation is insurance on a risk you do not have.

All prices here are 2026 estimates and vary by region, window size and count, material, elevation height and installer. Tessa is a hands-on homeowner, not a licensed contractor; use these ranges to ask sharper questions, and confirm lead-safe requirements and flashing details with certified local pros.

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