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Window Replacement Contractor in Boston area

Full-Service Window Company

D&G Exteriors is a full service window repair and replacement contractor in the Greater Boston Area. We're dedicated to enhancing your home’s energy efficiency, comfort, and curb appeal with our expert window installation and replacement services. At D&G Exteriors, we prioritize your satisfaction and comfort. Our experienced window installers and contractors are dedicated to providing high-quality window repair and replacement services tailored to your specific needs. With a focus on energy efficiency, durability, and aesthetic appeal, we ensure your new windows enhance your home in every possible way.

Is It Time to Replace Your Windows?

Sometimes it is obvious that your windows need to be replaced.  Depending on the material and way they were installed, a good indicator could simply be the age of the windows.  More discreet signed might be:

  • Energy Bills: An increase in energy bills may indicate your windows are no longer providing adequate insulation.

  • Operational Issues: Difficulty opening, closing, or locking your windows can signal it’s time for an upgrade.

  • Visible Damage: Cracks, warping, or condensation between panes are clear signs that window replacement is necessary.

  • Drafts: One of the most common issues, indicating failing seals.

  • Condensation: This can occur between panes in double or triple-glazed windows, suggesting seal failure.

  • Decay or Water Damage: Wood windows are particularly susceptible to rot and water damage over time.

The Window Replacement Process

Taking on a window replacement project (or even just a window repair project) can be daunting.  Your home's windows are a big contributing factor to your comfort in the home and the home's curb appeal.  We have a process to help you get comfortable with a window project:

  1. Consultation: Our window contractor team will assess your needs, preferences, and budget.

  2. Selection: We offer a wide range of materials and brands, including vinyl windows, wood windows, and composite windows from top manufacturers like Andersen, Harvey, Marvin, Pella, and Jeld-Wen windows.

  3. Installation: Our professional window installers ensure a seamless, efficient, and tidy installation process, minimizing disruption to your daily life.

  4. Follow-up: After we finish the installation, our job isn't done.  We will check back in with you to make sure you had a great experience and your loving the changes.

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Complete Window Buying Guide

The Parts of a Window

  • Head: Think of the head as the hat of the window - it runs along the top of the window.

  • Jamb: The jambs are like the arms. They run vertically along the sides of the windows.

  • Sash: The sash is the glass panel of the window. Its typically the part of the windows that slides up or down or swings in or out.

  • Muntins / Grilles: Muntins or Grilles are the grid like dividers in the windows, separating squares of glass.

  • Flange: The flange is band of material that goes around your whole window where fasteners are installed to hold the window in the opening and attach it to the wall. You won’t see the flange as it should be thoroughly covered with flashing and by your siding.

  • Rails: Rails are the horizontal guides on the top and bottom of the sash that allow the window to operate smoothly.

  • Interior Trim / Casing: This is the picture frame surrounding the window on the inside of your house. There are many different styles to choose from.

  • Exterior Casing: This is the picture frame surrounding your window on the outside. It typically integrates with your siding to provide a clean look. There are several options to choose from here too.

  • Drip cap: Consider the drip cap as your windows umbrella. It’s a thin piece of metal covering the top edge of your window on the outside, and prevents water from getting behind your window or to the wood sheathing underneath.

  • Sill: The sill is the shelf that sits on the bottom of the window.

Window Types

  • Double hung windows: probably the most common type of window. On this style, both the upper and lower sash (glass panel) move up and down, allowing you to open both the top and bottom of the window. Some double hung windows have upper sashes that can fold inward, making them easier to clean.

  • Single hung windows: just like double hung, but only the lower sash can move up and down.

  • Sliding / gliding windows: Sliding windows, or gliding windows, open horizontally. Picture a sliding door, just in a window.

  • Picture windows: Picture windows typically fixed (do not open). They are usually placed in areas where they can provide a great view, or let in lots of light.

  • Casement windows: Casement windows usually look like sliding windows, but install of sliding horizontally to open, casement windows are typically hinged on the sides of the window and open outward.

  • Bay windows: Bay windows extend out from the house, and are typically three windows side by side. Since they extend out from the house, they create a sitting area on the inside of the house.

  • Awning window: Hinged at the top of the window, these windows open outward, creating the opening at the bottom of the window.

  • Skylight: Skylights come in different styles and sizes, but they are installed in the ceiling, which allow light to flow into the house.

Window Frame Materials

  • Vinyl windows: Probably the most common material for windows. Vinyl windows are made from PVC. Good vinyl windows are usually durable, low-maintenance, and affordable.

  • Composite windows: These are very high quality windows. Composite (like Andersen’s Fibrex) claim to be stronger than vinyl, withstand extreme temperatures better, and resist fading, flaking and peeling.

  • Wood window: Wood windows are a good choice for their classic look. They can be purchased pre-painted or primed.

  • Aluminum windows: Probably the most budget friendly option, these aluminum windows can be a great choice for a cheaper window.

  • Fiberglass windows: Fiberglass windows are super durable. They won’t rot, rust, corrode, crack or bend. Fiberglass windows will last for a long time with little maintenance.

Window Energy Efficiency and Glass Options

  • Double pane glass: Two panes of glass sandwiched together. They provide good insulation and energy efficiency.

  • Triple pane glass: Three panes of glass sandwiched together. They provide great insulation and energy efficiency.

  • Low emission glass: This glass option is coated with a material that reflects heat back, keeping it outside, and keeping your home cooler in the summer and warmer in the winter.

  • U-value: This is a measurement for how well the window insulates. Lower U-values means it’s a better insulating window.

  • Solar heat gain coefficient (SHGC): Think of this as the window’s solar filter rating. It measures how much of the sun’s heat gets through the window. A lower SHGC score means the window will keep your home cooler in summer.

Other Window Options

  • Grille / Grid style: Typically you have an option for grid styles (or no grid if that is your preferred style).

  • Windows colors: Most windows come in a variety of colors - white, black, bronze and many others.

  • Hardware: Most window manufacturers offer a variety of hardware options. There are typically several lock styles (eg. sweep lock, cam lock, dual-action lock, etc) and hardware finishes (eg. white, bronce, nickel, black, etc)

  • Interior trim: Common trim style are colonial trim, brick mold trim, flat trim with a cornice top, and many others.

  • Exterior casing: You can buy windows with no exterior casing (in which case you can use your own and have more options), or you can buy them with casing included. Flat casing or brick mold casing are common.

Common Window Brands

  • Harvey Windows

  • Andersen Windows

  • Marvin Windows

  • Ply Gem Windows

  • Jeld-Wen Windows

  • Pella Windows

  • Milgard Windows

  • Simonton Window

What makes D&G different

Clear Communication

The number one complaint homeowners have about contractors is poor (or no) communication.  We try our best to communicate throughout the whole process and set clear expectations.  Getting work done on your home shouldn't be a guessing game.


Homeowners want options and convenience.  Too many contractors still rely on paper and handshake promises. At D&G, we use technology whenever we can because it creates a much better experience for our customers.


Answering the phone.  Responding to your questions. Showing up on time.  Communication.  These should be industry standards, but they aren't.  We do our best to show up as professionals.

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