Windows

Replacement windows Delaware homeowners rely on to seal out drafts and quiet the house

For replacement windows Delaware homeowners trust, Marathon Restorations is the local crew to call. Windows are where comfort and energy bills are won or lost. Old, single-pane or failing double-pane units let heat pour out in winter, bake your rooms in summer, and let street noise straight through the glass. Marathon Restorations installs energy-efficient replacement windows with low-E, insulated glass and a tight, true-to-frame installation — so your home stays warmer in winter, cooler in summer, and quieter year round.

The same crew that measures your openings installs them. No subcontractor handoffs, no finger-pointing — just clean trim, straight reveals, and a job site we sweep every day.

Window styles we install

• Double-hung — two operating sashes that tilt in for easy cleaning; the versatile, timeless choice for most homes.
• Casement — crank-out sashes that seal tight against the frame for excellent energy performance and unobstructed views.
• Sliding — smooth horizontal glide, ideal for wider openings and rooms where a projecting sash would be in the way.
• Bay & bow — projected multi-panel units that add light, space, and architectural character to a room.
• Picture — fixed, frameless-look glass that maximizes the view and daylight where ventilation isn't needed.
• Awning — top-hinged sashes that open outward for ventilation even in the rain; great above sinks and in basements.

Glass that does the real work

The frame style you choose is only half the window — the glass package is what you feel every day. We spec low-E (low-emissivity) coatings that reflect radiant heat back where it belongs: indoors in winter, outdoors in summer, with performance in line with ENERGY STAR guidance for our climate zone. Between the panes, insulated glass units with an argon or dual-pane air space slow the transfer of heat and cold, while a warm-edge spacer cuts the cold ring around the edge that causes condensation.

Two numbers tell you how a window performs. U-factor measures how well the unit resists heat loss — the lower the number, the better it keeps conditioned air inside. Solar Heat Gain Coefficient (SHGC) measures how much of the sun's heat comes through the glass. We help you match both to the way each side of your home faces the sun, so you're not overheating a south-facing living room or losing warmth on a shaded north wall.

Quieter rooms and lower bills

Multi-pane, tightly sealed windows do more than save energy — they knock down the noise from traffic, mowers, and weather. Homeowners who replace drafty, aging units routinely notice two things first: rooms that hold their temperature instead of swinging hot and cold near the glass, and a house that simply sounds calmer. Over the seasons, a home that isn't fighting drafts asks less of your furnace and AC, and that shows up on the utility bill — the everyday payoff of replacement windows Delaware families count on year after year.

Installation is what makes it last

A premium window installed poorly is just an expensive draft. Our crews measure every opening true-to-frame, remove the old unit cleanly, and inspect the rough opening before anything new goes in. We set each window dead level and square, shim it so it operates smoothly for years, insulate the gaps around the frame, and flash and seal the exterior so wind-driven rain has nowhere to get in. Then we finish the trim so the reveals are straight and the caulk lines are clean.

Tighter, quieter, and more efficient

We treat every opening like it is protecting our own family — energy-efficient units, manufacturer-certified installation, and a written warranty covering both labor and materials. When we leave, your windows are sealed, square, and ready for every season.