Loan Window Replacement Cost Estimator
Window quotes arrive as one five-figure blur. This estimator prices them the way the industry buys them — per window, by type, with the frame material factored — so a 10-window quote can be checked line by line instead of gasped at.
Prices are per standard-size window, installed (insert replacement into sound frames). Full-frame replacement, structural changes and very large units price above these bands — see the notes.
How it works
Installed per-window bands in vinyl frames: single-hung $450–$750, double-hung $550–$900, sliding $500–$850, casement $650–$1,050, picture $700–$1,200, bay $1,800–$3,200. Fiberglass frames multiply by about 1.2, wood/clad by 1.35 — the premium is material and finish, not installation difficulty. The labour inside each number is roughly a third: that is why one window costs nearly as much per unit as twenty (the truck roll is in every price), and why whole-house quotes per window should sit at or below these bands, never above.
Method & worked example
Method: Total = window count × per-window installed band by type (single-hung $450–750, double-hung $550–900, sliding $500–850, casement $650–1,050, picture $700–1,200, bay $1,800–3,200) × frame factor (vinyl 1.0, fiberglass 1.2, wood/clad 1.35).
Worked example: Ten double-hung vinyl windows: 10 × $550–900 = $5,500–$9,000 installed, mid-band $7,250.
When to use this
- A window company's quote needs a per-window reality check.
- You are phasing replacements and budgeting this year's rooms.
- You are comparing window types room by room (casements over the sink, hung elsewhere).
How to use it, step by step
- Count the windows in this phase.
- Pick the dominant type — re-run per type if the house mixes them.
- Apply the frame factor for the material you are quoted.
- Compare the per-window line, where padding hides.
What the inputs mean
| Input | What it is | Typical values |
|---|---|---|
| Window count | Openings in this project | 6–20 typical whole-house phases |
| Type | Operating style sets the band | Double-hung $550–900; casement $650–1,050; bay $1,800–3,200 |
| Frame material | Multiplier on the band | Vinyl 1.0; fiberglass 1.2; wood/clad 1.35 |
Another worked example
Six casement windows in vinyl for a kitchen and bath refresh: 6 × $650–1,050 = $3,900–$6,300, mid-band $5,100. In fiberglass frames the same six would run $4,680–$7,560 — frame choice alone is a four-figure decision on a small project.
Frequently asked questions
How much does it cost to replace 10 windows?
In double-hung vinyl: $5,500–$9,000 installed, mid-band $7,250 — $550–$900 per window. The same ten in casement run $6,500–$10,500. A quote per window far above the band for standard inserts deserves a line-item explanation.
What do 6 casement windows cost?
$3,900–$6,300 in vinyl. Casements carry more hardware (cranks, hinges, locks) than hung windows, which is most of their premium — and why their seals age better when maintained.
Why is a bay window so much more?
A bay is three windows, a seat, a header structure and often a small roof — $1,800–$3,200 is really a mini construction project with glass in it. Bows (4–5 panels) price higher still.
Vinyl, fiberglass or wood frames?
Vinyl is the value standard and the band basis here. Fiberglass (+20%) handles heat and big sizes better and can be painted. Wood/clad (+35%) is the historic-home and high-end choice. All three insulate similarly at the same glass spec — you are buying looks, longevity and profile, not R-value.
Do new windows pay for themselves in energy?
Rarely on energy alone at these prices — expect single-digit to low-double-digit percent off heating/cooling in a leaky-window house. Comfort, noise, condensation and resale carry the rest of the case. The BTU Estimator shows how much of your load is envelope; windows are one part of it.
🌡️ Chasing the energy bill too?
If drafts sent you window shopping, the BTU Estimator shows the whole envelope story — insulation level included — before you spend five figures on one part of it.
Insert or full-frame replacement?
Inserts (pocket replacements) keep sound frames and trim — faster, cheaper, the basis of these bands. Full-frame is warranted when frames are rotted or the opening itself changes; expect it to price noticeably above the band.
What efficiency rating should I look for?
ENERGY STAR for your climate zone is the sane floor; U-factor at or below 0.30 in heating climates and low SHGC in cooling climates are the spec-sheet numbers that matter more than pane count marketing.