At Curtis Timber Windows we provide the highest quality in sash window and box sash window installation services, in Chiswick, Battersea and surrounding areas.


Our sash windows are manufactured to the highest standards with attention to detail that reflects the period character that make these windows so desirable. From the stylised parting and staff beads, hard wearing sash cords and pulleys to the sash mouldings and ears on both top and bottom sashes we not only replicate your sash windows but improve on them for your home comfort too. Box Sash Windows Chiswick

Integral draught proofing to all beads and sashes together with an ‘A’ rated low-emissivity double glazed unit combine to give our box sash windows a high level of insulation. The natural warmness of wood is complimented by the micro porous wood stain finish that is applied both before and after glazing and with a final coat as necessary after fitting, with the architraves and nosing’s blending in to give a fine natural finish.

Technical info

All of the timber we use is of high quality and is from sustainable sources. We are able to provide the choice of US redwood or sapele hardwood as standard or the option of ACCOYA which offers the best of both class 1 long term durability and environmental sustainability.

Our sash windows come certified with a thermal transmittance U-value of 1.5 W/m2K; (equivalent to ‘A’ rated) incorporating a 24mm argon filled unit with a warm edge spacer bar and Planitherm low emissivity glass of 1.2W/m2K centre pane value and is in compliance with BS EN ISO 10077-1:2006.

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