Marvin has discontinued its Coastline collection and closed its West Palm Beach plant, ending its manufacture of High Velocity Hurricane Zone products. For architects and builders working Miami-Dade, Broward, and coastal Palm Beach jobs, a marquee IZ4 line just fell off the approved-products list.
A Marquee HVHZ Line Just Left the Market
Marvin has officially pulled out of the toughest hurricane market in the United States. As reported by Window + Door and confirmed by Marvin's own communications, the Coastline product collection has been discontinued and the SIW Solutions retail operation in Delray Beach, Florida, is now closed. With this move, Marvin will no longer manufacture products for High Velocity Hurricane Zone (HVHZ) or Impact Zone 4 (IZ4) regions.
That's a meaningful subtraction from the approved-products universe for anyone specifying windows and doors in Miami-Dade, Broward, and coastal Palm Beach County — jurisdictions that require Florida Product Approval with the HVHZ endorsement or a Miami-Dade Notice of Acceptance.
What's Actually Being Discontinued
The discontinuation covers the HVHZ/IZ4 solutions inside Marvin's Ultimate collection, including Ultimate Casement, Awning, Direct Glaze windows, and Swinging French doors. Marvin says it will continue to offer Impact Zone 3 (IZ3) products, which the company positions as sufficient for the vast majority of coastal impact regions outside the HVHZ.
In plain terms:
- IZ4/HVHZ (Miami-Dade, Broward, coastal Palm Beach): Marvin is out.
- IZ3 (most other Gulf and Atlantic coastal counties): Marvin's Ultimate line remains available.
For architects who have historically leaned on Coastline for its narrow-sightline aluminum aesthetic paired with HVHZ compliance, the substitution question is not trivial. The Coastline line — originally developed by SIW and later folded into Marvin — was one of the few premium, architect-grade aluminum systems carrying a Miami-Dade NOA.
The Jobsite Impact: 181 Employees, One Facility
The closure is not just a spec-sheet event. Marvin told Window + Door that a total of 181 employees from the Coastline manufacturing facility in West Palm Beach and the SIW Solutions retail operation in Delray Beach are impacted, with team members remaining employed through early January 2026 and some staying longer to assist with closure activities. A WARN notice filed with the state of Florida confirms the West Palm Beach plant closure is expected to be permanent.
For GCs and installers with active projects, that timeline matters. Warranty support and parts availability for previously installed Coastline units is a separate question from new-order fulfillment, and specifiers writing addenda right now should confirm both.
Practical Implications for the Spec Sheet
If you are an architect, contractor, or building envelope consultant with active or pipeline work in the HVHZ, here's where the discontinuation lands hardest:
- Re-specification on in-progress jobs. Any project that named Coastline Ultimate Casement, Awning, Direct Glaze, or Swinging French doors as basis-of-design needs a substitution. That means new NOAs, new anchor calcs, new rough-opening confirmations, and — critically — new shop drawings.
- Design vocabulary shift. Coastline's narrow aluminum sightlines were a specific aesthetic. Substitutes will need to match sightline width, muntin patterns, and finish options, or the design intent gets compromised.
- Lead-time exposure. With one national player exiting HVHZ, remaining Miami-Dade-approved manufacturers pick up the demand. Expect capacity pressure on the shortlist of aluminum impact-window makers that still hold current NOAs.
- Bid protection. Subcontractors bidding HVHZ scope should confirm the approved manufacturer's current NOA status and production lead times before locking in unit pricing.
- Owner communication. For custom residential and boutique hospitality work in South Florida where Marvin was often the owner-preferred brand, the design team needs to reset expectations early.
Why Marvin Left — And What It Signals
Marvin has framed the exit as a strategic shift away from HVHZ/IZ4 manufacturing to focus on other priorities across its national footprint. Read alongside recent bankruptcy filings among South Florida installers and ongoing tariff and input-cost pressure on aluminum extrusions, the Coastline closure fits a pattern: HVHZ is an expensive market to serve, with narrow tolerances on testing, certification, and product approval maintenance.
For specifiers, the takeaway is straightforward. The HVHZ approved-products list is shorter than it was a year ago. Build your substitution matrix now, verify current NOAs directly with manufacturers, and keep an eye on which players still see the HVHZ as a market worth the compliance overhead.