Where’s the job?

Overview

• Fitting modern roof windows enhances natural daylight, reducing reliance on artificial lighting.

• Skill level: 3 / 5 (accurate measuring, cutting and sealing required).

• Typical duration: 1 – 2 days, depending on roof complexity and type of window.

Safety First

• Wear suitable personal protective equipment such as gloves and eye protection.

• Verify the stability of the roof structure before making any cuts.

• Use a safety harness when working on steep or high roofs.

• Follow manufacturer’s guidelines for window installation and flashing.

• Check local building regulations for necessary permits and safety codes.

Tools & Materials

Step-by-Step

1. Assess the roof structure – check for load-bearing capability and locate the optimal position for daylighting.

2. Mark and measure the opening – accurately size the rough opening to the window dimensions.

3. Cut the roof – safely remove the material along the marked lines using appropriate tools.

4. Install flashing and support – secure flashing around the opening and add structural support if necessary.

5. Fit the roof window – seat the window firmly into the opening, ensuring a watertight seal.

6. Secure and seal – fasten the window frame and apply additional sealant as required.

7. Test for leaks – simulate rainfall or use a hose to ensure there is no water ingress.

Completion Checks

• The window should operate smoothly, opening and closing without obstruction.

• All seals and flashings must be tight, with no evidence of gaps or leaks.

• The installation should comply with local building codes and manufacturer instructions.

• The roof structure remains intact and weatherproof post-installation.

When to Call a Pro Instead

If the installation involves complex structural changes, uncertain roof conditions, or requires certification for building compliance, consulting a professional installer or a structural engineer is advised to ensure a secure and compliant outcome.