http://www.squareglazing.co.uk/ FREE QUOTES At Square Glazing Ltd we manufacture, supply and install Double Glazing, UPVC Windows and Bi-Folding Doors in East London, Chigwell, Wanstead and Enfield. Our Premium Double Glazing UPVC Aluminium Windows and Doors are available to Residential, Trade and Commercial clients across Greater London, Wanstead, Chigwell and Enfield