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aluminium front door aluminium patio door aluminium sliding door approved document building regulations Burglary-resistant Burglary resistance casemet door double casement door double track EN 1627 flush threshold frameless glass extension glass-box extension glass floors glass room glazing company glazing installer glazing project low threshold modern style opening types Part L planning permission resistance class Resistance Classification safety glass single track steel doors steel entrance door steel framed windows steel french door steel patio door steel windows thermal insulation thermal performance timber windows toughened glass tricle vents triple track u-value ventilation walk-on glass windows and doors wooden windows