The seven inputs
- How many windows? (1–40; bays and bows count as one with a note)
- Mostly which style? Double-hung / single-hung · Casement / awning · Slider · Picture / fixed · Basement hopper · Bay or bow (quoted after measure; the estimate uses a placeholder band)
- Frame material? Vinyl · Fiberglass · Composite · Aluminum-clad wood · Historic replica (wood, clad, composite or finished aluminum from the City's approved list)
- Insert or full-frame? Keep the old frame (insert) · Remove it (full-frame) · Not sure — the estimate shows both
- What is the wall? Siding over frame · Brick veneer over frame · Brick masonry (pre-war) · Stone
- When was the house built? 2000+ · 1980–1999 · 1950–1979 · Before 1950 — sets lead-safe work (pre-1978) and prompts the metal-sash note (1950s–70s)
- In a City of St. Louis historic district? Yes · No · Not sure — "Yes" restricts the material to the approved classes for street-facing openings and asks how many openings face the street
What you get
- A low-to-high installed range for the whole job and per opening.
- A line showing what widened the range (e.g., "brick masonry: +$150–$400 per opening", "pre-1978: lead-safe work +$40–$120 per opening", "historic district, 4 street-facing openings: replica class").
- A downloadable brief (text or PDF) with your inputs and the range, which you can attach to the quote form.
- No account, no tracking of your inputs on our side. See privacy.
What the estimate cannot know
Rot in the sills and jambs, a failed lintel, an opening out of square, an oversized or arched unit, glass upgrades such as triple-pane or laminated, and the exact product series. The measure visit settles those and the written quote is exact. The estimate is for deciding whether and what; the quote is for deciding whom.
Reference bands (per opening, installed, 2026)
| Material | Insert, frame wall | Full-frame, frame wall | Insert, brick | Full-frame, brick |
|---|---|---|---|---|
| Vinyl | $550 – $950 | $800 – $1,300 | $700 – $1,200 | $1,000 – $1,700 |
| Fiberglass | $850 – $1,350 | $1,050 – $1,650 | $950 – $1,500 | $1,100 – $1,900 |
| Composite | $900 – $1,450 | $1,100 – $1,750 | $1,000 – $1,600 | $1,200 – $2,000 |
| Aluminum-clad wood | $1,100 – $1,800 | $1,350 – $2,200 | $1,250 – $2,000 | $1,500 – $2,600 |
| Historic replica (approved list) | sash kit $1,100 – $1,900 | — | — | $1,500 – $2,800 |
Adders: pre-1978 lead-safe work $40–$120 per opening; triple-pane $120–$250; picture/fixed about 10% less than double-hung; basement hopper about 40% less; bay/bow 3-lite $2,800–$6,500 after measure. Multi-window discount: the per-opening figure falls roughly 15% between three openings and twelve.
Next step
Happy with the range? Get a quote — attach the brief, add photos, and we set the measure visit. Want the range to be sharper first? Measuring and photos for an online estimate.