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Why is there such a big price difference between different glass skylights?

We sell a range of flat glass skylights to suit all budgets. At first glance they may look the same however there are some district differences in spec and build which explains the difference in price. For example the glass spec is different on all our ranges, some are fire rated others are not. Below you will find a full comparison of our Flat glass range.
Features Mardome Glass Atlas Flat Glass SkySeal Flat Glass
Part L Compliant Yes Yes Yes
Non Fragility Class B Non-Fragile to ACR(M)001 Manufactured & kitemarked to
BS EN 1279-2. toughened to
BS EN 12150-1
Impact tested to BE EN 12600
Security Glass Tested to P3A – P4a to EN 356
Frame provides P4A Class resistance
to burglary & Vandalism
Not Tested Not Tested
Fire Rating Meets BS476 Class 1 Not Tested Not Tested
U Value Of Glass 1.1 W/m2K 1 W/m2K 1.3 W/m2K
U Value of overall roof light 1.25 W/m2K 1.3 W/m2K

1.6 W/m2K

Glass Thickness Overall: 31.5mm
6mm Toughened Outer
16mm Argon Filled Cavity
9.5mm Toughened & laminated
low E inner
Overall 28mm
6mm Toughened Outer
16mm Argon Filled Cavity
6mm Toughened
Overall 24mm
6mm Toughened Outer
12mm Argon Filled Cavity
6mm Laminated inner
Noise reduction 39dB (RW) Not Tested 33db (RW)
Frame Material Anodised Aluminum Aluminum Aluminum
Available Frame Colours Silver Anthracite Grey (7016)
Black (9005)
Anthracite Grey (7016)
Thermal break Yes Yes No
Size options Available in set sizes Bespoke made to measure Available in set sizes
Warranty 20 Years 10 Years 7 Years
Weight 50 Kg/M2 40kg/m2 38kg/m2
Typical Cost of
1200 x 900
Roof Light
£860.35 £771.00 £585.00