HarborGate Collection
HarborGate Exterior Doors
Fiberglass Prehung Entry Doors. Painted White or Black. Built to Last.
HarborGate brings the front door into the Shoreline lineup: fiberglass prehung entry doors built the way builders spec them — a 2 mm fiberglass skin on both faces over a PVC and LVL stile-and-rail frame, a polyurethane foam core, Low-E insulated glass, and a primed PVC jamb with ball-bearing hinges and a black threshold. Six designs, from a four-lite contemporary entry with transom and sidelites to a 20-minute fire-rated three-panel Shaker, every one factory-painted White or Black to match HarborForge door hardware. 36 by 80, 1¾ inches thick, left- or right-hand inswing.
Built for Performance. Designed for Life.
2 mm Fiberglass Skin, Both Faces
Every HarborGate slab is skinned in 2 mm fiberglass on the outside and the inside. Fiberglass doesn't dent like steel, doesn't rot, swell, or warp like wood, and holds factory paint through freeze-thaw cycles — the reason builders spec it for the one door that takes the most weather.
Polyurethane Foam Core
A polyurethane foam core fills the slab edge to edge inside a PVC and LVL stile-and-rail frame — insulating, dimensionally stable, and quiet. Frankfort swaps in a 20-minute fire-rated core for garage-to-house openings.
Factory-Painted White or Black
Two colors, painted at the factory rather than shipped primed: White (RAL 9003) and Black (RAL 9005). The black matches HarborForge Matte Black door hardware, so a black door with black hardware arrives coordinated instead of close.
Low-E Insulated Glass
Glass lites, sidelites, and transoms are Low-E insulated units that reflect radiant heat back to the side it came from — warmer entry in winter, cooler in summer — without tinting the view.
Prehung and Prepped for Hardware
Each door arrives hung in a primed 6-9/16″ PVC jamb on black ball-bearing hinges, with standard 2⅛″ bores at 5½″ spacing and a 2¾″ backset. Any HarborForge handleset or smart deadbolt installs straight out of the box — no field boring.
Sealed Sill and Threshold
A 7⅝″ black threshold with an adjustable mill-finish sill, dark cap, and compression weatherstrip on all three sides. Adjust the sill after installation to close the gap under the slab as the house settles.
The HarborGate Collection
Four complete entry systems with transom and sidelites, plus two Shaker single doors — every one a fiberglass prehung unit, factory-painted White or Black.
Front Entry · Transom + Sidelites
Entry Systems with Transom & Sidelites
Complete front-entry systems — a 36 × 80 slab flanked by two 14-inch full-lite sidelites under a full-width transom, hung together in one primed PVC jamb. Four glass patterns, from a contemporary four-lite to full lite.
Charlevoix
Transom + Sidelites1.1
4-Lite Contemporary Entry
Four stacked horizontal lites, full-lite sidelites, and a full-width transom — the modern-farmhouse front entry.
Petoskey
Transom + Sidelites2.1
¾-Lite, 1-Panel Entry
A three-quarter lite over a single raised panel, with full-lite sidelites and a transom — the traditional front entry.
Leland
Transom + Sidelites3.1
Full-Lite Entry
A slim-framed full lite of Low-E glass, edge to edge, with full-lite sidelites and a transom — maximum daylight.
Ludington
Transom + Sidelites4.1
Full-Lite, Wide-Stile Entry
A full lite of clear glass framed by wider stiles and rails, with full-lite sidelites and a transom.
Single Door · Shaker Style
Single Entry Doors
Three-panel Shaker doors for a front entry without room for sidelites, a side door, or the door between the garage and the house — one with a Low-E top lite, one solid and 20-minute fire-rated.
Frankfort
20-Min Fire Rated5.1
3-Panel Shaker · Fire-Rated
A solid three-panel Shaker with a 20-minute fire-rated core — the door between the garage and the house.
Saugatuck
Single Door6.1
1-Lite Shaker
The three-panel Shaker with a Low-E lite in the top panel — a single front or side door with daylight.
Frequently Asked Questions
Yes. Every HarborGate unit ships prehung — the slab is already hinged into a primed 6-9/16″ PVC jamb with the threshold, adjustable sill, and compression weatherstrip installed. The four entry systems (Charlevoix, Petoskey, Leland, Ludington) arrive as one assembled unit including both 14″ sidelites and the transom. The installer sets the unit in the rough opening, plumbs and shims it, and fastens through the jamb.
Two factory-painted colors on every design: White (RAL 9003) and Black (RAL 9005). These are finished doors, not primed doors — no field painting is needed. If a project calls for a custom color, the white unit takes exterior acrylic latex well after a light scuff; note that field paint falls outside the factory finish coverage.
Every HarborGate door except Frankfort is double-bored to the residential standard: 2⅛″ bores at 5½″ spacing, 2¾″ backset, with a mortised edge latch prep and a 1″ × 2¼″ deadbolt strike prep. Any HarborForge handleset or smart deadbolt installs directly. Frankfort, the fire-rated door, is single-bored for a keyed lever or knob only — pair it with a HarborForge Entry lever.
All HarborGate doors are inswing and available in either hand. Stand outside facing the door: if the hinges are on your left and the door swings away from you, it is a left-hand inswing; hinges on your right, a right-hand inswing. Specify the hand on the order — the hinge side, bore side, and threshold are all set at the factory and cannot be reversed in the field.
Units ship without brick mold by default, ready for the exterior trim the builder specifies — most of our builders wrap the opening in PVC trim board. A 2″ PVC brick mold can be added to any order as an option.
Charlevoix, Petoskey, Leland, and Saugatuck use Low-E insulated clear glass in the door lites, and the entry systems carry Low-E glass in the sidelites and transom as well. Ludington is glazed with clear insulated glass. Frankfort is a solid fire-rated door with no glass.
Warranty & Care Guide
Shoreline Brands stands behind every product we manufacture.
HarborGate exterior doors carry a limited warranty against manufacturing defect in the fiberglass slab, stile-and-rail frame, and prehung jamb assembly. Specific terms — duration, insulated-glass seal coverage, and exclusions — are provided in writing on request before a project is specified.
The factory-applied paint finish is covered against peeling and delamination under normal residential exposure. Fading and chalking on dark colors in full-sun exposures, and any field-applied paint, are outside the finish coverage.
Warranty Coverage
- Manufacturing defects in the fiberglass skin, core, and stile-and-rail frame
- Prehung jamb, hinge, and threshold assembly defects present at delivery
- Factory paint peeling or delamination under normal residential exposure
- Insulated-glass seal failure (fogging between panes) — term provided on request
Warranty Exclusions
- Damage from improper installation, an out-of-plumb opening, or an unprotected exposure without an overhang
- Field-applied paint, stain, or coatings, and any damage from stripping the factory finish
- Forced entry, impact, and cosmetic damage incurred after delivery
- Labor for removal, reinstallation, and any resulting siding, trim, or flooring work
- Commercial and multifamily common-area installations — contact us for coverage
Care Guide
Cleaning the Painted Surface
- •Wash with mild dish soap and warm water on a soft cloth or sponge; rinse and dry.
- •Never use abrasive pads, powdered cleansers, or solvent-based cleaners — they dull and scratch the factory paint.
- •Clean the sidelite and transom frames the same way; they carry the same painted finish as the slab.
Glass and Weatherstrip
- •Clean glass with a standard non-ammonia glass cleaner; keep it off the painted frame around each lite.
- •Wipe the compression weatherstrip with a damp cloth twice a year and check that it seats against the slab on all three sides.
- •If daylight shows under the slab, turn the sill adjustment screws to raise the sill cap — do not shim the threshold.
Hardware and Hinges
- •Ball-bearing hinges need no lubrication; if a hinge squeaks, a single drop of light machine oil on the pin is enough.
- •Tighten hinge and strike screws annually — a slab that drags at the top corner usually means a loose top hinge, not a warped door.
- •Touch up chips with a matching exterior acrylic latex; keep touch-ups off the weatherstrip contact surface.