Fenestra – Window Generator for Blender

👉 See all my Blender addons on BlendKit >

Fenestra builds real windows inside Blender, from a six over six Georgian sash under a brick jack arch to a black steel factory window with broken panes, a Tudor leaded light in a stone mullion, a Victorian bay on a brick knee wall or a slate gable dormer. Pick one of 71 designs and change anything: every part is a number, a choice or a switch, and the window rebuilds live as you drag.

Every window is built like the real thing: a moulded frame, sashes with stiles, rails and meeting rails, single, double or triple glazing with spacers and gaskets, glazing bars in the pattern you choose, and hardware on the inside. Sashes really open: hung sashes slide, casements, awnings and hoppers swing, tilt and turn sashes tilt or turn, sliders slide, jalousie louvers turn and pivot sashes rotate.

Dress it with a stone, concrete, wood, brick or metal sill, a lintel, keystone, jack arch, soldier course, arch ring, hood mould, cornice or pediment, a casing or quoins, louvered, panel or board and batten shutters, and security bars. Put it in a piece of wall with real reveals, in a dormer on a roof, or cut its opening into your own wall in one click.

Features
- 71 designs in ten families: sash, casement, picture, arched and round, gable and dormer, bay and bow, sliding, industrial, historic and Mediterranean
- 11 window types: fixed, double and single hung, casement, awning, hopper, sliding, tilt and turn, pivot, jalousie and industrial steel
- 13 outlines: rectangle, rounded, segmental, round top, elliptical, Gothic, Tudor, peaked, trapezoid, triangle, half round, round and octagon, at any size
- 9 grille patterns: colonial grid, Prairie, Queen Anne, diamond leaded, sunburst, spider web, arch fan and cottage
- Mullions, transoms, French pairs, Chicago windows and Palladian windows
- Bay and bow windows with knee walls and hip roofs
- Gable, shed, hipped and barrel dormers on a roof
- Sills, lintels, arches, pediments, casings, quoins, shutters and security bars
- Cut Into Wall: a live Boolean opening in your own wall that follows the window
- Photo-scanned PBR materials: painted and stained wood, uPVC, aluminium, steel, bronze, stone, brick, stucco, slate and nine kinds of glass, ready for game engines
- Surprise and Vary buttons, a picture-driven sidebar, Shift+A menu and Convert to Mesh
- One clean mesh object per window, works in Cycles and EEVEE

Requires Blender 4.2 or newer. Tested on Blender 4.2, 4.5 and 5.2 LTS.

Installation

In Blender open Edit, Preferences, Get Extensions, then use Install from Disk and pick the window_generator zip.

Usage

• Open the Window tab in the 3D viewport sidebar (N). With nothing selected, click the picture to choose one of the 71 designs, or browse the ten families, and add it at the 3D cursor. You can also use Shift+A, Mesh, Window.
• The card at the top shows the design, its width and height, its size and face count. Surprise makes a new random window, Vary changes the current one a little, the palette button picks a random finish and the arrow resets the design.
• The icon tabs hold every setting: Shape (outline, size, single, bay, bow or Palladian), Type (how it opens, units, transom, how far it is open), Grille, Frame (frame, sash and glazing sizes), Dressing (sill, head and casing), Shutters & Bars, Wall & Dormer, Finish (materials and weathering) and Parts (part visibility, detail, standard sizes, Convert to Mesh, Delete).
• To cut the opening into your own wall, select the wall, then the window, and press Cut Into Wall in the Wall & Dormer tab. The opening follows the window when you change it.

The window's origin sits at the bottom centre of the opening, with the outside facing -Y, so it snaps easily onto walls.

Which Blender versions are supported?

Blender 4.2 and newer. It is tested on Blender 4.2, 4.5 and 5.2 LTS.

Can it cut the hole in my own wall?

Yes. Select your wall, then the window, and press Cut Into Wall. A hidden cutter and a Boolean modifier make the opening, and it follows the window when you resize or reshape it.

Do the windows open?

Yes. Hung sashes slide, casements, awnings and hoppers swing, tilt and turn sashes tilt or turn, sliders slide and jalousie louvers turn, with one Open slider.

Can I use the windows in a game engine?

Yes. Each window is one mesh with metric UVs and image-based PBR materials. Convert to Mesh gives a plain mesh ready to export.

Does it work in EEVEE?

Yes, in both Cycles and EEVEE.