Window construction

How to compare

The high-quality construction of our products ensures greater security, heat insulation and noise reduction.
Compare the differences between our high-quality products and lower-cost alternatives.

High-quality frame

Lower-cost frame


High-quality product

  • Multi-chamber construction improves strength and gives a superior thermal and acoustic performance
  • Frames constructed from first-grade upvc, which will not discolour
  • Lifetime guarantee
  • Fitted with warm-edge spacer bars that are made from insulating composite materials to reduce heat loss
  • Sealed units available with 28mm gap or 36mm gap (triple-glazed)
  • Special glass construction allows warmth (solar heat) to enter your home whilst whilst reflecting the heat back into the room
  • Sealed units are filled with argon gas which acts as an insulator against cold air and noise
  • Frame fully reinforced with stainless steel
  • All joints welded

Lower-cost alternative

  • Simplified construction provides less strength and an inferior thermal and acoustic performance
  • Frames will discolour in time
  • No lifetime guarantee
  • Fitted with aluminium spacer bars which are less efficient in reducing heat loss, giving the windows a lower energy rating
  • Sealed units with 28mm gap only
  • More heat is allowed to escape
  • Standard air gap
  • Frame not reinforced
  • Mechanical joints only

Window Express for:
Replacement Windows, Double Glazing Windows, Triple Glazing Windows, Casement Windows, Sash Windows, Composite Doors, Bi-Fold Doors, Residential u-PVC Doors, Conservatories and more

We cover South London and Kent, including:
Battersea, Beckenham, Bickley, Biggin Hill, Bromley, Catford, Chelsea, Chislehurst, Clapham, Croydon, Crystal Palace, Dulwich, Eltham, Farnborough, Hayes, Kent, Keston, Lewisham, Orpington, Penge, Pratts Bottom, Shortlands, Sidcup, South East London, South London, Swanley, West Wickham.

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