Storm-Proof Casement

All Timber Windows Norfolk Window products are manufactured to the highest quality, and have 60 Years+ Service Life, under Low Maintenance regime up to 80 in less exposed areas. When you choose our high specification Timber Windows, you can be sure that they will provide Style and Endurance for years to come. Due to the modern manufacturing process and the Service Life, TWN’s Windows are Carbon Negative. Our products are designed to save money and CO², whilst meeting and Exceeding, the Energy Efficiency Standards in the UK Building Regulations Recommendations.

Energy Storm-Proof Casement

Specifically designed and engineered to meet the exacting demands of the latest Secured by Design Standards, the Energy Plus Window has demonstrated proven resistance to both opportunistic & sustained attack in some of Britain’s highest crime areas.

  •     Tested to BS 7950: Enhanced Security.
  •     Secured by Design
  •     Optional built-in child-proof restrictor automatically
  •     Excellent foul weather performance to BS 6375: Part1 and 2
  •     Suitable for use as Fire Escape
  •     Friction free hinges for ease of maintenance and cleaning


Technical Details

       U Value                        Glass                     Thickness (mm)

  •        18                                 DG                               24
  •        1.6                                DG                               24
  •        1.3                                DG                               24

Energy Ratings A-C

  • FSC & PEFC Softwood
  • Hardwood (Sapele)
  • FSC Laminated Softwood
  • Optional SBD*
  • Georgian Bar / Glazing Bar
  • Plant on Astragal Bar
  • Bay Window
  • Top / side hung