Openings to replace
Replacement method
Full-frame tear-out typically runs 20-40% more per opening than an insert.
Frame material
$450–$900 per opening, installed.
Rotted sill or frame repair
Rot, soft sills, or damaged framing found on tear-out is billed per opening.
Trim, capping & disposal
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How this calculator works
Windows are quoted per opening, not per square foot, so that's how this tool prices them. Base per-opening ranges by frame material come from 2024 national window replacement cost research (Angi, 2024). Sill and frame repair, interior trim and exterior capping, disposal and permit fees are shown as separate line items so you can see exactly what's pushing the total up.
Each add-on uses conservative labor + material midpoints from published cost tables. The calculator's high number assumes moderate site-condition risk, not a worst case.
Frame material is the biggest driver
Frame material moves the total more than any other input. National per-opening installed ranges run roughly $450–$900 for vinyl, $600–$1,400 for aluminum, $800–$1,600 for fiberglass or composite, and $1,000–$2,500 for wood-clad (Angi, 2024). Large picture, bay, and bow units sit above those bands because of unit size and the crew required to set them.
- Vinyl: best value, low maintenance, the volume choice for whole-home replacement.
- Aluminum: thin frames and big spans, but weaker thermal performance in cold climates.
- Fiberglass / composite: stronger frames, slimmer sightlines, better dimensional stability.
- Wood-clad: premium interiors with a low-maintenance exterior, highest cost per opening.
Insert vs full-frame replacement
An insert (pocket) replacement drops a new unit into the existing frame and is the faster, cheaper path when the frame and sill are sound. A full-frame tear-out removes everything down to the rough opening and typically costs 20-40% more per opening, but it's the only option when there's rot, water damage, or you're changing the window size (Angi, 2024).
Rotted sills: the most common surprise cost
Sill and frame rot is the single most common source of change orders on a window job. Repair typically runs $150–$600 per opening and often isn't visible until the old sash comes out (Angi, 2024). Skipping it isn't optional: a new unit set on a soft sill will leak, sag, and fail its warranty.
Trim, capping, disposal, and permits
Exterior capping in coil stock runs about $75–$200 per opening, interior trim or drywall return rebuilds $100–$350 per opening, and haul-away of the old units $40–$100 each. Permits and inspection are usually a flat $100–$500, and homes built before 1978 add lead-safe containment (Angi, 2024).
Why the range is so wide
Window quotes for the exact same 10 openings routinely land 2 to 3 times apart. Two reasons. First, contractors scope different work: one bids inserts with no capping, another bids full-frame with new trim, capping, and disposal. Second, frame and sill conditions only reveal themselves once the old sash is out, and those are legitimate change orders, not overcharges.
The calculator's high number assumes moderate site-condition risk. If your frames are sound and you're doing inserts, expect the low end. If it's an older home with wood sash and storms, budget the high end.
Frequently asked questions
How accurate is this calculator?+
It's a planning tool, not a quote. Your actual bids should land within the range about 80% of the time. The 20% outliers are usually either lowballs that missed capping or disposal, or premium glass and grid upgrades.
Why does full-frame cost so much more than an insert?+
Full-frame means removing the old frame, sill, and interior and exterior trim down to the rough opening, then rebuilding all of it. It adds hours per opening and usually trim, capping, and insulation work an insert never touches.
Should I trust the low end or the high end when budgeting?+
Budget the high end if your home is older or you haven't confirmed frame and sill condition. Most window projects finish closer to the high end once disposal, capping, and any rot repair are added in.
Does the estimate include permits?+
Only if you toggle disposal and permit on. Straight insert swaps are exempt in some jurisdictions, while enlarging an opening or changing egress almost always requires a permit and inspection.
Is it cheaper to do all the windows at once?+
Usually yes. Mobilization, disposal, and permit costs are spread across every opening, and most installers price a whole-home job below the sum of the same windows done one at a time.
Keep planning your window project
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