Replace the Windows in a Sunroom Addition
The sunroom was added after the house, with its own windows from its own builder, and they have gone before the house's windows did.
Reply within one business day. Or call / text 763-250-3621.
To replace the windows in a sunroom addition, JMB Builders measures the five to nine windows that make up the room's walls, usually a different brand and age than the house, and puts them on one order so they match each other. A sunroom's worth of windows is a normal job for us, priced per opening, mixed styles welcome. Twin Cities metro. Send photos and we reply within one business day, or book a free in-home estimate.
- A sunroom's windows are a normal job, priced per opening
- Five to nine windows on one order, usually one to two days
- Mixed styles on one order: fixed, casement, awning
A sunroom addition is a room made of windows. Five to nine of them on three walls, often a lighter grade than the house's windows because the addition was built fast and glass was the point. Twenty years on, the seals have fogged, the vinyl has chalked, the sashes rattle in wind, and the room is too hot in July and too cold in January.
Replacing them is one order and one or two days. Because the sunroom's windows are all the same age and the same brand, they all go, and the new ones come from one line in one frame color and glass, so the room reads as one set again. The styles can mix: fixed glass in the middle of each wall for the view, casements or awnings at the ends for air. Mixed styles on one order is normal.
The sunroom sits against the house, so its windows are seen next to the house's windows from the yard. At the measure we note the frame color and grille pattern of the house windows you keep and pick a line that sits with them. Glass matters more here than anywhere else: a low-E coating that cuts summer heat on the south and west walls, and a warmer glass on a north-facing room.
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
- A photo of each sunroom wall from inside, and one of the room from the yard
- A photo of a house window next to the sunroom, for the match
- Any label on the sunroom window frames or spacer bars
- Furniture and plants out of the sunroom the morning of the install
- Paint or stain color for new trim: painting is quoted as a separate line, or leave it primed and caulked and paint it yourself
What JMB supplies
- A line-item quote, each sunroom window priced per opening
- One in-person measure of every sunroom opening and a match check against the house windows
- All sunroom windows on one order through our supplier so they match
- Removal, sill pan or flashing tape, shims, low-expansion foam and sealant at each opening
- A glass package chosen for the room's exposure, with tempered glass where the code calls for it
- Interior stops or casing and exterior capping or trim as written on the quote
- Cleanup, haul-away of the old units and photos in your job folder
How it is priced: per opening
Quoted in writing from your photos, with a reply within one business day. What moves the number:
- How many windows the sunroom has and the size of each, large fixed units most of all
- The mix: fixed glass vs. casements and awnings that open
- Glass package: heat-cutting low-E for a south or west room, warmer glass for a north room, tempered where required
- Insert into sound frames or full frame where the sunroom's lighter framing has rotted
- Brand, series and frame material, matched to the house windows
- How the sunroom's siding or panels meet the window frames outside
- Interior finish: trim kept, new stops, or new casing in wood or PVC
Tell us which way the sunroom faces. South and west rooms need glass that cuts heat; north rooms need glass that keeps it.
How long it takes
Lead time depends on the line and glass and is written on the quote. Five to nine sunroom windows: one to two working days, the room closed each night.
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
Same layout, new windows
Each opening gets a new window of the same style and size, fixed where it was fixed and opening where it opened. The least framing work and the quickest install.
More fixed glass, fewer openers
The middle of each wall becomes one fixed unit for the view, with a casement at each end for air. Fewer frames, more glass, and a cleaner look from inside.
Sunroom windows plus the patio door
The door from the sunroom to the deck is usually the same age as the windows. On the same order it comes in the same frame color and glass.
Replace the Windows in a Sunroom Addition: questions, answered
Can you replace just the windows in a sunroom addition and not the house?
Yes. A sunroom's five to nine windows are a normal order for JMB Builders, each priced per opening, with the house windows you keep checked at the measure so the two read together from the yard. Send photos and we reply within one business day, or book a free in-home estimate.
Why did the sunroom windows fail before the house windows?
Additions were often built with a lighter window than the house, and a sunroom has far more glass taking far more sun. Heat and UV work on the seals and the vinyl all day, so the units fog and chalk sooner. The house's windows, in smaller openings under eaves, had an easier life.
Can the sunroom windows be different styles on one order?
Yes. Mixed styles on one order is normal. Fixed units for the view, casements or awnings at the corners for air, and a transom above if the room has them, all from one line in one frame color and glass.
What glass should a sunroom have?
It depends on the exposure. A south or west sunroom wants a low-E coating that blocks summer heat so the room is usable in July. A north sunroom wants a coating that keeps heat in and, often, a third pane. Glass near the floor or beside the door is tempered. We pick the package at the measure and write it on the quote.
Will the new sunroom windows match the house windows?
We check at the measure. The house windows you keep are noted for frame color, grille pattern and brand, and the sunroom windows are ordered in a line that sits with them from the yard. The sunroom's windows do not have to be the same style as the house's, only the same color and grille look.
How long does it take to replace all the sunroom windows?
Five to nine windows usually take one to two working days. Large fixed units and any full-frame work where the addition's framing has rotted add time. The room is emptied in the morning and closed and sealed each night.
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 25, 2026 · JMB Builders LLC, MN license BC809005 · All windows pages
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