ProVia Endure Bay Window Replacement
The bay window's roof leaks, the seat board is soft and the side windows fog.
Reply within one business day. Or call / text 763-250-3621.
ProVia Endure bay window replacement is a made-to-order three-window bay in ProVia's Endure vinyl line: a fixed center with casements or double-hungs on the angled sides, a seat board inside, an insulated floor and a new roof outside, in white or a painted exterior with a white or woodgrain interior. JMB Builders measures, orders through ABC Supply and installs it across the Twin Cities. Send photos and we reply within one business day, or book a free in-home estimate.
- Priced per window, the whole bay as one line
- Casement or double-hung sides, fixed center
- Seat board, insulated floor and new roof included
A bay window is three windows, a floor, a roof and a cantilever, and when one part fails the others usually follow. Water gets in at the roof, the seat board rots, the side windows fog and the whole unit sags away from the house. Replacing it means a new bay built to the opening, set on supports that carry its weight, and roofed and flashed into the wall.
ProVia builds the Endure bay to order: a fixed center window with casements or double-hungs on the two angled sides, in the standard bay angles, with the Endure frame in white or a painted exterior and a white or woodgrain interior. Grilles go between the glass or as simulated divided lites. Glass is dual-pane Low-E argon, with triple-pane where you want it. The seat board comes in a finish to match, with an insulated floor under it.
The install is the heavy part. We measure the opening and the old bay's projection, order through ABC Supply, our supplier, and set the new unit on support brackets or a knee wall, insulate the floor, build or re-roof the top with shingles or metal, flash it into the siding and trim it inside. We are the installer. Options such as Andersen 400 and Silver Line V3 bays can be priced beside it.
Get a written quote for this job
Three photos and a sentence is enough: a reply within one business day, or ask for a free in-home estimate. Or text the photos to 763-250-3621.
What you supply
- Photos of the bay from inside, from outside straight on and from the side showing the roof
- Casement or double-hung side windows, and whether the center should match the house's grilles
- Exterior color and interior finish, white or woodgrain, and the seat board finish
- Roofing for the bay: shingles to match the house, or metal
- Paint or stain for new interior trim: Painting is quoted as a separate line — or leave it primed and caulked and paint it yourself.
What JMB supplies
- In-person measure of the opening, the projection and the header, with a check of the floor and framing for rot
- The ProVia Endure bay window, ordered through ABC Supply to your sizes and finishes
- A line-item quote with the bay, the roof, the supports and any rot repair as separate lines
- Removal of the old bay, roof and seat, and haul-away
- Support brackets or a knee wall sized to carry the new unit, and an insulated floor
- Sill pan, flashing tape, and a new roof over the bay flashed into the siding
- Low-expansion foam, backer rod and sealant; interior casing and seat board trim
- Photos of the finished bay in your job folder
How it is priced: per window
Quoted in writing from your photos, with a reply within one business day. What moves the number:
- Bay width, projection and angle, and casement vs. double-hung sides
- Painted exterior and woodgrain interior vs. white
- Triple-pane and grille options
- Roof: shingles vs. metal, and tying into the house roof or siding
- Supports: brackets vs. a knee wall, and the condition of the existing cantilever
- Rot in the floor, header or wall framing once the old bay is out
- Second-story bays that need scaffold
A bay is one line on the quote, with the roof and supports listed under it. Send a side photo so we can see how the old roof meets the wall.
How long it takes
Lead time depends on the order and is written on the quote. A bay replacement is usually one to two days on site, longer if the floor or header needs repair.
How your project works
- 1
Send photos, get a written quote
Send three photos of the space and a sentence about what you want. You get a clear, itemized reply within one business day. Prefer a look in person? A free in-home estimate is always an option.
- 2
Pick materials, or bring your own
We help you choose profiles and materials that fit the house and the budget, or match your existing millwork exactly — or you buy the door or trim yourself and we install it. Everything is confirmed before the crew is scheduled.
- 3
Clean, precise installation
The crew shows up on time, protects floors and furniture, and installs with tight joints and consistent reveals. Photos of the finished work go in your job folder.
- 4
Walkthrough and invoice
We walk the finished work with you. If anything is not right, we fix it before we call the job done. Then one invoice, paid by check or direct deposit — no card fees, no payment links.
Situations and options
Casement bay
Casements on the angled sides crank open for air and seal tight. The usual pick for a kitchen or dining bay where the sides are hard to reach for lifting a sash.
Double-hung bay
Double-hungs on the sides for a traditional front, with grilles to match the rest of the house. Both sashes tilt in for cleaning.
Bay replaced with a flat window
If you would rather lose the bay, the opening is closed in and a wide Endure picture window or a mulled set goes in flush with the wall. We quote both ways if you are undecided.
ProVia Endure Bay Window Replacement: questions, answered
Does ProVia Endure come in a bay window?
Yes. The Endure line includes bay and bow windows built to order, with a fixed center and casement or double-hung sides in the common bay angles. It comes in white or a painted exterior with a white or woodgrain interior, and a seat board to match.
What holds up a new bay window?
The weight sits on support brackets fastened to the wall framing, or on a knee wall built under the bay to the ground or a foundation. The old bay often hung on the window frame alone, which is why it sagged. We size the supports to the new unit.
Does the bay window get a new roof?
Yes. The old roof comes off with the bay, and a new roof is framed over the new unit, insulated, shingled to match the house or covered in metal, and flashed into the siding or the house roof above it. The roof is where most old bays leaked.
Can the side windows of the bay open?
Yes. Order casements or double-hungs on the angled sides; the center is fixed. Casements are easier to reach across a seat board, which is why they are the common choice.
What if the floor under the bay is rotted?
The soft wood comes out and the floor framing is rebuilt and insulated before the new unit is set. We show you photos when the old bay is off and quote the repair from what we find. A new bay is never set on soft framing.
Who orders and installs the ProVia bay?
We do. The opening and projection are measured in person, the bay is ordered through ABC Supply to those sizes and finishes, and our crew sets, supports, roofs and trims it. If you already ordered a bay, we install it labor only.
Recent JMB work, from our job log
59 installs recorded across 30 Twin Cities communities since Dec 2025. Window and door installs for homeowners and the builders we work with. Counts come straight from our job log; no customer names.
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Read morePage reviewed October 27, 2026 · JMB Builders LLC, MN license BC809005 · All windows pages
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