We provide a very broad assortment of accessories that meet a range of applications, as we understand that each project poses its own unique set of challenges, especially with historical window openings.

These accessories help accomplish several goals that a project manager or developer is looking for. They can enhance the look of the window and the architectural appeal of the building’s façade. They can help make the installation more efficient, safer and of higher quality. They can enhance performance. Whatever the reason they become critical to insuring the projects execution, quality and appearance is the best it can be. The accessories are as follows:

Exterior Grids and Grids Between the Glass – Grids enhance the windows appearance and become necessary for creating an historic look. The combination of exterior & grids between the glass can create the same aesthetic of true divided lites and is a more cost effective and energy efficient approach.

Interior Grids – Interior grids used in combination with Exterior grids & grids between the glass can create the true divided lite look within the interior as well as from the outside.

3 Piece Structural Mullion System – Mullion systems are generally for vertical mulls creating the look of two or more windows in a side by side configuration which may include various window types in the same series. These mullions come in various widths and they are structural in order to provide the strength necessary to handle the design pressures and spans required for the application.

Trim & Clip – This is a two component system. The clip provides a means of anchoring the window frame to the building. The trim is a continuous piece snaps over the clips to finish the look on the interior perimeter and cover the anchoring fasteners. There is a range of sizes to meet the requirements of the window installation details

Extruded Receptor System – This system allows for the pre-installation of an extruded (thermally broken) receiver angle into the prepared opening. With the opening full prepped the window can more easily be positioned and then locked in place with a second mating lock in closure. This simplifies the installation process.

Custom Extruded Panning Shapes – A wide range of extruded panning shapes is available to customize the look of the perimeter or window surround. These shapes attach to the window frame perimeter and fasten together at the corners. They come pre-attached from the factory to simplify the installation. Care is given to properly seal all the joints. The installation details matching the field conditions are critical to insure that the window system fits well and creates the look desired.

Caulk Stop – This small slide on piece provides a pocket around the exterior perimeter of the window system to accommodate and trap a backer rod in the optimum position for the purpose of creating a quality perimeter caulk joint.

Frame Extender – Snap in piece extends the frame width for the purpose of provide a wider appearance, a wider exterior face for accommodating face mounted accessories or for extending the reach of the frame for a proper fit within the opening detail.

Nail Fin – Snap on nail/installation fin attaches to the window frame perimeter can be utilized for locating, flashing & anchoring

Strap Anchor – Clips that attach to the window frame perimeter that allow the window to be anchored to the opening structure from the inside behind the frame’s interior

Interior Screen System with Trim & Clip Frame – Provides a means of mounting a sliding insect screen on the interior side of the window. The interior trim and clip can provide the anchoring and finishing for the installation as well. This option is well suited for historic work where an exterior mounted screen is unacceptable

Mull Cover – 2 piece cover includes inside attachment mounting plate and snap over cover in various widths. To cover narrow portions of the building structure between windows, a color matched metal cover is provided.

Brake Metal Flashing & Cover Pieces – Specific color matched brake formed sheet custom metal components to suit the project requirements.

Commercial Products

Steel Replica (5000 Series)

Our Steel Replica series offers an ultra-narrow sightline window with a clean putty bead profile.  This series is best used for historical restoration projects, that is replicating a classic historic steel or wood window aesthetic without sacrificing ...

Sideload AW (7000 Series)

Our Sideload series boasts a high performance AAMA AW rated Double Hung & Single Hung window with a matching Picture window. This series provides that classic putty bead profile but with a deep frame design for the most demanding project requirements...

Commercial CW (8000 Series)

This series is our standard commercial grade performance AAMA HC/CW rated windows. We use high quality thermally broken aluminum extrusions to manufacture all of our windows. As a good majority of our 8000 Double Hung is used in historical applications, ...

Projected AW (9000 Series)

Our 9000 series is a top performance AAMA AW rated Projected Casement and Picture Windows with a very sleek 2” frame depth design to meet commercial applications. The aesthetic is a simple flat face with clean lines for an appealing industrial a...


We provide a very broad assortment of accessories that meet a range of applications, as we understand that each project poses its own unique set of challenges, especially with historical window openings. These accessories help accomplish several...


When it comes to finishing touches Diamond Windows delivers. At Diamond, we can accommodate a variety of aluminum finishes. We keep a stock of commonly used colors, such as white, black, and bronze, but if you do not see your preferred color listed,...