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How to Frame a Window? Complete Guide

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Windows are both functional and aesthetical additions to your home. They provide light and ventilation to the interior space while adding appeal to the exterior. Windows come in various shapes and designs, giving homeowners many options.

While windows are the focus, their frames are just as important. Window frames secure the window, keeping the space airtight and stopping water from entering. Selecting the correct window frame makes your job easier and should be compatible with the window material.

DIY enthusiasts looking to renovate their homes and change windows may struggle with the framing. So, we’ve put together this guide, teaching a simple process to frame a window. But first, what is window framing?

What is a Window Frame?

What is a Window Frame

A window frame is the part between the window glazing and the wall. It supports the window by securing it to the wall and preventing air space. The suitable frame differs based on the window material, size, and design.

Framing a window exposes you to the correct wall part and the more delicate window area. So, you must attach the frame to these two parts without errors. Errors like misalignment and wrong calculation can jeopardize the window’s integrity.

For every window framing, you’ll deal with the top, the head side, the bottom, the sill side, and the sides or jambs. Replacing with a window frame allows you to make more holistic changes to your window’s architecture and look.

Also Read: How to Build a Wood Awning Frame? Step-by-Step Guide

Window Frame Materials

Window frames can be made from different materials, all sporting various levels of aesthetic appeal, durability, and style. Before choosing the material, you must consider location, window purpose, style, and design. Here are some popular materials:

1. Wood


Wood is a traditional framing material used from medieval times but still in use. Although it has lost some popularity, wood is still used to frame windows, especially in barns and sheds. It is easy to use, considering it’s affordable prices. However, wood is prone to moisture damage and decay.

2. Vinyl

Aesthetics and affordability are the primary driving forces for using vinyl for window framing. The material is moisture resistant, free from insect attack, and immune from corrosion. All these make it an attractive option. Aside from its affordability, vinyl is low maintenance, further improving its popularity.

3. Aluminum


Arguably the most popular framing material, aluminum is used extensively to frame glass windows. This framing material is suited for temperate regions as its poor insulation and high thermal conduction make it unsuitable for areas with extreme temperatures.

Other advantages include affordability, low maintenance requirements, and recyclable material.

4. Steel

Steel is a highly durable framing material and is low maintenance. Its elegance is boosted by the slim frames packing enough stability to hold the window. Steel windows also have excellent thermal conductivity; however, they are expensive.

5. PVC


With durability of over 20 years, there’s a firm reason PVC window frames are quickly gaining popularity. They resist damages caused by the weather, mainly when PVC windows are utilized.

6. Fiberglass

Fibreglass is the most suitable window framing material for people in regions with high-temperature changes. The material is lightweight, eco-friendly, and surprisingly durable. Aside from steel, fiberglass is the most durable framing material. Their resin and glass fibers combination ensures this stability.

Supplies Required

While there are different framing materials, we’ll focus on using wood. This section will highlight the supplies you need to complete this process.

  • 2×4 or 2×6 lumber
  • Plywood
  • Shims
  • 16-D and 10-D nails
  • 3 inches deck or wood screws
  • Staples
  • Hammer
  • Stapler
  • Handsaw
  • Reciprocating saw
  • Level
  • Stud finder
  • Drill with the driver bit
  • Measuring tape
  • Flat pry bar

Steps to Frame a Window

Steps to Frame a Window

Installing a window frame is generally an intermediate skill level and may take an entire day. The process is long but straightforward with a guide. Follow our precise description to install a wooden window frame.

Step One: Prepare the Work Area and Check the Studs

All you need to do here is put the work area in order and ensure the studs are in good condition. Improve the ventilation in the room and over the ground with drop cloths.

There’s likely to be a lot of dust, so sealing the doors will prevent the dust from entering adjourning rooms or spaces. Before inspecting the studs, remove the current window, if any.

Pay attention to the stud to see if it’s in excellent condition to be nailed on and carry weight. The idea is to nail a clear unto the wall stud so you can use the clear as a nailing surface for the frame.

Step Two: Cut and Install Studs

You’ll need to cut two cripple studs and fasten the sill every 12 inches. Do this away from the window before installing. Identify the king stud and size check that it fits between the top and bottom plates. Nail the king stud and cripple stud 10d nails or 2-inch screws.

Step Three: Mark Stud Placements

Step Three: Mark Stud Placements

Get your tape ready for this stage as you measure all the necessary points to ensure proper alignment and stability of the frame. The king and jack stud location on the bottom plate is the first place to measure.

Next, measure for the top of the header. You’ll need a level and tape, with the level on the jack studs providing alignment. The middle studs also require measurement to get the rough opening dimensions.

To complete the marking, you need a square. This tool will help you get accurate adjoining straight lines from the already marked lines.

Step Four: Cut the Lines

Use the circular saw to cut the marked lines, especially those on the middle studs. But first, ensure the saw is set at maximum depth and the blades are sharp. You may want to test it on a scrap piece before proceeding. A hand or reciprocating saw is sometimes required to complete the cut.

Also Read: How to Cut a 45 Degree Angle With A Circular Saw?

Step Five: Build the Header and Sill

Step Five: Build the Header and Sill

Cut two pieces of 2×6 or 2×8 lumber to make the header. The length should be the length of the opening plus 3 inches. The spaces should be cut from ½” plywood. It is vital to know the bend direction of the two header pieces. This direction will guide you on the best side to use.

Secure the two pieces with a spacer placed 10 inches between the header lumbers. Secure this connection using 3-inch screws.

You also need two pieces of wood for the sill cut to length. Place a cripple stud between the two sill pieces and secure the ledge using nails or screws. Check the opening to ensure these pieces will fit.

Also Read: How to Cut Curves in Wood? 7 Different Methods

Step Six: Cut the Wall Where Required

Depending on the type of wall, some prying and cutting may be required at this stage. The aim is to get the space ready with minimal patching required. This is because patching can be challenging for walls that contain plaster.

Check the sill and header width before using your reciprocating saw on the wall. While chipping with the saw, gently score through the upper and lower studs to avoid mistakes.

Step Seven: Attach the Header and Still

Step Seven: Attach the Header and Still

You can push the header into the area with the space clearly defined. Use jack studs on both ends to keep it standing. It is essential to fix the header first to help carry some of the weight of the wall and roof. Install the sill and secure all the pieces using the appropriate screws.

Precautions and Tips for Window Framing

Working with some of these tools and building window frames can be challenging. However, you can simplify the process by learning helpful tips and precautions.

  • Check local building codes for permits. You may require a permit to install window frames in some locations, so it is best to check with your local building codes first.
  • Use protective gear like goggles when cutting tools, as dust and wood particles can enter your eyes.
  • Cut the exact size of the wall to avoid the extra stress of plastering a large area.
  • Consider the room location and position of other windows. You want to provide cross ventilation as much as possible.


Questions may arise before, during, or after building your window frame, so we’ve compiled some popular questions and provided their answers.

Q1. What are the main components of a window frame?

Ans: The head, jamb, and sill are the three primary components of a window frame. The head is the top piece, the jambs are the vertical sides of the window, and the sill is the bottom piece.

Q2. What do you put between the window and frame?

Ans: Apply a masking tape between the window and frame to protect both parts and maintain good contraception.

Q3. What is the difference between a window frame and a casing?

Ans: A window casing is the outer finish installed on the window frame to give it an attractive look. The casing typically matches the molding around doors. On the other hand, the window frame is the internal structure holding the window to the wall.


You can build a window sill as a DIYer with intermediate experience. However, ensure you have the resources, building permit, and time to complete the project. The process requires patience and observing the necessary precautions to prevent accidents.

While the list of supplies is long, most are regular tools DIY enthusiasts may own. Choose a frame that suits the window size, design, and home architecture.