Start here
- The complete St. Louis replacement window guide — house era, wall, districts, lead, permits, glass, cost and the online process, in the order the decisions come up.
The house — what it is made of and what that changes
- Replacing windows in a brick house — masonry openings, brickmould, lintels, pocket vs. full-frame in brick, what goes wrong.
- St. Louis historic district window rules — all eighteen City districts, the CRO approved list, what passes on each façade.
- Lead-safe window replacement — why windows are the exception in the RRP rule, and what a certified crew does differently.
- Insert vs. full-frame replacement — the decision that moves the price most, opening by opening.
The rules and the money
- Window replacement cost in St. Louis — published ranges by style, material, method and wall; the brick, historic and lead-safe premiums.
- Do you need a permit? — City, County, St. Charles County and Metro East, with the verified rows marked.
- Tax credits and rebates in 2026 — the federal credit ended; what the utilities do and do not rebate; PACE.
- Comparing window quotes — the in-home price gate, published financing APRs, warranty fine print, and a worksheet.
The product
- Window performance ratings for St. Louis — U-factor, SHGC and the North-Central zone.
- Window styles and materials — matched to the house in front of you, with the district constraint built in.
- Repair or replace? — a decision tree that often says repair.
- Measuring and photos for an online estimate — exactly what to send, and what we never ask you to measure.