Square Bay Window

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Square Bay Window Guide:

 

Square bay windows, also known as box bay windows, are a popular style of bay window that extend outward from a building’s wall in a rectangular shape. Here are some key details about square bay windows, including materials and costs:

Design and Features

Square bay windows typically consist of three window panels:

  • A large central window
  • Two smaller side windows at 90-degree angles to the main window

This creates a boxy, squared-off shape that projects from the exterior wall. The design allows for:

  • Increased natural light
  • Expanded views
  • Additional interior floor space
  • A sense of spaciousness in the room

Materials

Common frame materials for square bay windows include:

uPVC (Unplasticized Polyvinyl Chloride)

  • Most affordable option
  • Low maintenance
  • Good insulation properties
  • Available in various colours and finishes

Aluminium

  • Lightweight and durable
  • Modern aesthetic
  • More expensive than uPVC
  • Excellent for larger window sizes

Timber

  • Traditional, classic look
  • Can be painted or stained
  • Requires more maintenance
  • Most expensive option

Costs

The cost of square bay windows varies based on size, materials, and glazing options. On average:

  • A uPVC square bay window costs between £1,695 and £3,205
  • Aluminium and timber frames typically add £400-£600 to the base uPVC price

Specific price ranges:

  • Small 3-panel uPVC: £800-£1,205
  • Medium 4-panel uPVC: £1,200-£1,605
  • Large 5-panel uPVC: £1,600-£2,205

Factors that can increase costs include:

  • Larger sizes
  • Triple glazing (30% more expensive than double glazing)
  • High-quality timber frames
  • Complex installations or upper floor placements

When budgeting for a square bay window, it’s important to factor in both material and labour costs. Installation typically takes 2-3 days and can add £500-£750 to the total price

 

square bay window

 

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