Replace a 3 Panel Sliding Patio Door — and 4-Panel Wide Sliders
Your patio door is three or four panels wide, the rollers are shot, the glass has fogged and nobody wants to quote it because it does not come off a store shelf.
Reply within one business day. Or call / text 763-204-2099.
To replace a 3 panel sliding patio door or a 4-panel slider up to about twelve feet wide, JMB Builders checks the header and sill at an in-person measure, orders the door in the same panel layout or a new one, and sets the heavy panels with a full crew on a full-length sill pan. Twin Cities metro, priced per door. Photos get a reply within one business day, or book a free in-home estimate.
- Priced per door
- Header and sill checked before ordering
- Full crew for heavy panels
A standard slider is two panels: one fixed, one moving, about six or eight feet wide. Three- and four-panel doors run nine to twelve feet or more. The common layouts are a center panel that slides between two fixed panels, two sliders that part in the middle of a four-panel door, or a door where two panels stack to one side. They are made to order, they weigh a lot more, and they put more load on the opening than a standard slider does.
The measure is where the big questions get answered. Is the header over the opening sized for that span, or has it sagged so the old panels bind at the top? Is the floor under a ten-foot sill flat, or does it crown or dip? Which layout do you want, and do you want to keep the same opening or change it? If the opening gets wider, a new header is sized to code, or by an engineer when the span or the load above calls for it, and a permit is pulled when the city requires one.
Install day takes a full crew and a clear path. The fixed panels and frame come out, the subfloor is checked and repaired along the whole length, and a full-length sill pan goes down before the new frame is set and shimmed dead level. A long sill that is not flat is the reason big sliders drag and leak. Panels go in last, then rollers, locks and screens are adjusted. Floors are covered from the door to the driveway, and the opening is closed before the crew leaves.
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 763-204-2099.
What you supply
- Photos of the whole door inside and out, and of the floor along the sill
- Your panel layout, frame color and glass choices
- A clear path from the driveway to the door for the crated panels
- Furniture moved back from the door, or help us plan around it
What JMB supplies
- In-person measure with a header and sill check before ordering
- The door ordered in the panel layout you choose
- A full crew to remove and set heavy panels
- Subfloor and sill framing repaired along the full width
- Full-length sill pan, flashing tape, foam and sealant
- New header sized to code or by an engineer if the opening changes; permit when required
- Panels, rollers, locks and screens adjusted; casing and exterior trim
- Painting quoted as a separate line, or paint it yourself; haul-away of the old door
How it is priced: per door
Quoted in writing from your photos, with a reply within one business day. What moves the number:
- Width and panel count: three, four or more panels
- Panel layout: center slider, center-opening pair or stacking
- Same opening vs. a wider or narrower one with header work
- Sill and subfloor repair along the full width
- Glass size and weight, and frame material
- Access for crated panels from the driveway to the door
- Brand and line; the lead time depends on the brand and is written on the quote
Send a photo of the whole door from inside and outside, and a shot along the sill from one end. We reply within one business day.
How long it takes
Same-size replacement: usually one full day once the door arrives. A new header adds one to two days. These doors are made to order; lead time depends on the brand and is written on the quote.
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
Three panels, center slider
Two fixed panels with a moving center panel, or one fixed and two moving. Common on 1990s great rooms; often replaced in the same layout.
Four panels, center-opening
Two moving panels that part in the middle between two fixed ones. A wide opening to a deck or patio, about twelve feet in many homes.
Same width, different layout
The opening stays, the panel layout changes, for example a three-panel door replaced with a two-panel slider and a fixed sidelite, ordered to the same rough opening.
Replace a 3 Panel Sliding Patio Door — and 4-Panel Wide Sliders: questions, answered
Can a 3 panel sliding door be replaced with the same size?
Yes, and that is the most common version. The door is measured in person, ordered in the same rough opening size and panel layout, and set in the existing opening after the sill and subfloor are checked. Keeping the opening avoids header and wall work.
Do I need a new header for a wider sliding door?
If the opening gets wider, yes. The header is sized to code for the new span, or by an engineer when the span or the load above it calls for it, and a permit is pulled when the city requires one. A same-size replacement keeps the existing header if it has not sagged.
Why does my wide sliding door drag at the top or the bottom?
On a wide door, a header that has deflected pinches the panels at the top, and a sill that is not flat makes them ride uphill. New rollers do not fix either. Both get checked at the measure, and the new frame is set dead level on a full-length sill pan.
How many people does it take to install a 12 foot sliding door?
A full crew. The glass panels on a wide door are heavy and the frame is long, so it is carried and set by several people with a clear path from the driveway. That is planned at the measure so the right number of hands is there on install day.
How long does a four panel sliding door take to arrive?
Wide sliders are made to order, so they usually take longer than a standard two-panel door. The lead time depends on the brand and line and is written on the quote. Nothing is ordered until the opening has been measured in person.
Can a 4 panel sliding door be changed to French doors?
Sometimes. A wide opening can take a pair of hinged doors with fixed sidelites, ordered to the same rough opening. Hinged doors need swing room inside or out, so furniture and deck layout get checked at the measure before choosing.
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 9, 2026 · JMB Builders LLC, MN license BC809005 · All doors pages
Where we work
Door Replacement & Installation near you
Based in Zimmerman, scheduling across the Twin Cities metro. Closest first: