Window Replacement & Door Installation in Upstate SC

Window & Door Replacement in Greenville & Upstate SC

Four Seasons Building & Remodeling replaces residential windows, entry doors, and patio doors across the Upstate — vinyl, fiberglass, and aluminum-clad wood from major manufacturers, plus custom mahogany and fiberglass entry systems. Every install includes proper pan flashing, butyl integration with the existing weather barrier, and the insulation and trim work that determines whether the opening stays weather-tight for 30 years. SC license RB52147.

Realistic 2026 Upstate pricing: vinyl double-pane Low-E windows $450–$900 installed for standard openings, fiberglass windows $700–$1,400 installed, aluminum-clad wood (Andersen/Marvin/Pella architectural) $1,200–$2,800+ installed. Entry doors run $1,800–$4,500 installed for standard 36-inch units, and patio doors run $2,500–$25,000+ depending on style and size. A full-home window replacement (typically 12–20 openings) usually runs $8,000–$22,000.

Full-Frame vs. Insert (Pocket) Replacement

Every window opening on every assessment gets inspected individually. Insert (pocket) replacement keeps the existing window frame and slides a new unit into it — faster, cheaper, and the right call when the frames are sound and properly flashed underneath. Full-frame replacement removes the entire window down to the rough opening, installs new pan flashing, and integrates a new weather seal — the right call when frames are rotted, flashing is failing, or you're already re-siding. Typical full-frame upcharge is $200–$400 per window. We tell you honestly which approach each opening needs instead of bidding everything the cheap way.

What a Real Window Install Includes

• Pan flashing at every sill and butyl seal integration with the existing weather-resistive barrier. Skipping this is the #1 cause of leaking new windows.
• Low-expansion spray foam between the new unit and the rough opening — not fiberglass batt that compresses and lets air through.
• Energy Star certified glass package for the Southeast climate zone — typically Low-E366, argon-filled, warm-edge spacer. Cuts cooling-season heat gain 25–40% over original single-pane.
• New interior casing and exterior trim as needed, painted to match.
• Haul-off and recycling of the original units.
• Manufacturer warranty registered in your name plus our workmanship warranty on the install.

Entry Doors and Patio Doors

We replace fiberglass and steel entry doors for $1,800–$4,500 installed (standard 36-inch), custom wood entries (mahogany, walnut) with sidelights and transoms from $5,500 to $15,000+, and sliding or French patio doors from $2,500 to $25,000+ depending on size and style. Multi-point locksets and proper deadbolt reinforcement come standard on every entry-door install — security upgrade is part of the job, not an extra.

Doing Windows With a Re-Side?

If you're planning a siding replacement within the next 1–2 years, do the windows at the same time. The wall is already open, the flashing integration with the new house wrap is far cleaner, and you only pay to open up the opening once. We coordinate combined siding-and-windows projects often and bid them as one job for the lowest combined cost.