Window Installation & Replacement

New windows change how your home looks, feels, and performs — and the installation is what makes all the difference.

Old or poorly installed windows affect your home more than most people realize. Drafts in the winter, heat pushing through in the summer, condensation building between panes — these are all signs that your windows are no longer doing their job. At D&J Construction, window replacement starts with understanding what is actually wrong and what your home needs to perform better year-round. Long Island weather puts real demands on a home, and your windows need to be able to handle it.

D&J handles window installation and replacement across Nassau and Suffolk County — single windows, multiple units, and full-home replacements. Whether you are updating older double-hungs in a Levittown colonial or replacing casement windows in a newer Bay Shore home, the installation process is handled with the same level of care every time. Proper flashing, tight sealing, and level placement are not optional steps — they are what separates a window that lasts from one that causes water damage two years later. Dennis personally oversees every installation to make sure it is done right from the rough opening to the interior casing.

The result you should expect is simple — a window that opens smoothly, locks securely, keeps the weather out, and looks clean from both inside and outside your home. That is the standard D&J holds on every job. If your windows are overdue for replacement, call (855) 594-4857 and let us assess what your home actually needs.

What We Offer:

Single & Multi-Window Replacement — Replacement of one window or an entire home's worth, handled efficiently without disrupting your daily routine.
Exterior Sealing & Flashing — Proper weatherproofing around every window to prevent water intrusion and air leaks from the outside.
Interior Casing & Trim Finish — Clean interior trim work installed around every window so the finished look is tight and matches the rest of the room.
Rough Opening Preparation — Assessment and correction of the rough opening before installation to ensure the window sits level and fits properly.
Double-Hung, Casement & Picture Window Installation — Experience with all common residential window styles found across Long Island homes.
Damaged Frame Repair — Identification and repair of rotted or water-damaged frames before new windows are installed.

Why Choose D&J Construction for Window Installation & Replacement

Weatherproofing Done Right — D&J does not skip the sealing and flashing steps that most homeowners never see but always feel. Every window is sealed properly on the exterior so water and air stay where they belong — outside.
Owner On Every Installation — Dennis is present on every window job, checking that each unit is level, sealed, and finished correctly before moving on. You are not left wondering if the crew did it right.
Experience With Long Island Homes — After 11 years working across Nassau and Suffolk County, D&J has replaced windows in homes of every age and construction type. Older homes with non-standard openings, newer builds, and everything in between — the approach is adjusted to fit what the home actually requires.
Full Finish Included — The job is not done when the window is in the opening. D&J finishes every installation with proper interior casing and trim so the window looks like it belongs in the room, not just dropped into the wall.
No Subcontractors — The crew that shows up is D&J's crew. Dennis manages the people doing the work directly, which keeps quality consistent from the first window to the last.