Pre-Owned Doors
Folding, sliding-glass & multi-slide door systems — NanaWall, Marvin, Fleetwood & WinDor
What's in this collection?
Collection includes 37 pre-owned doors — interior, entry and sliding-glass patio styles — most of them unused leftovers from canceled or over-ordered building projects, never installed. Folding, sliding and multi-slide door systems from NanaWall, Marvin, Fleetwood and WinDor have all moved through this page; sold systems stay listed below, marked SOLD, as a record of what surfaces here. Second-hand and open-box doors are added as they arrive, most available for local pickup in Los Angeles, CA or shipping. Prices for most listings range from $12 to $12,125.
Updated September 12, 2026
How much can I save?
Conditions & Discounts
Doors are priced by model age, condition, and brand. Not every listing includes a comparable retail price — typical savings vs. new are shown below.
| Condition | Items | Typical savings vs. new |
|---|---|---|
| Pre-owned New | 6 | 25–45% off |
| Pre-owned Open Box | 5 | 35–55% off |
| Pre-owned Excellent | 4 | 45–65% off |
| Other / Outlet / Discontinued | 1 | — |
Savings ranges are typical across Unbuilt relative to the equivalent item new at retail; individual listings vary.
Want more discounts?
- Make an offer — many listings accept offers; look for the Make an Offer button on the item.
- Trade or design pro? Tell us about your business — we're building a trade program.
Where are they from?
Sources & Authenticity
Sold by Unbuilt
Sourced from designers, builders, and authorized dealers — unused project leftovers, showroom samples, and open-box returns. Every item is verified authentic by our team and returnable within 30 days (see our returns policy).
Community Listings
Posted directly by members of the Unbuilt community. Confirm condition, authenticity, and return terms with the seller before you buy — terms vary by listing.
Buying pre-owned on Unbuilt
- Inspect the photos and condition notes on every listing.
- Message the seller with questions before you buy.
- Every item lists its condition, so you know exactly what you're getting.
Shipping & pickup
- Can doors ship to me?
- Most listings ship nationwide, with freight for oversized items where noted.
- See full shipping details.
Highlights
- NanaWall, Marvin, Fleetwood & WinDor systems
- Interior, entry & sliding glass patio
- Folding & multi-slide systems
- Pre-owned, new & open-box condition
Top Categories
Sliding & Patio Doors, Interior Doors, Door & Window Doors, Entry Doors
Related Collections
Locations
- Los Angeles, CA (3) · local pickup or shipping
- Sherman Oaks, CA (2) · shipping
- Essex, MA (1) · shipping
- Santa Rosa, CA (1) · shipping
Sell with us
Got Extra Doors?
You can earn money, save waste and help your community by reselling them on Unbuilt.
Learn howBuild better
Making an Impact
Building materials, including Door & Window goods, consume half of all natural resources extracted globally each year. By shopping secondhand on Unbuilt, you're supporting a movement to make building more affordable and sustainable.
Learn about your impact
