From concept to completion...

We recognise the value and integrity that period properties bring to our environment and understand the need to retain the important historical features that provide the unique essence, charm and character of your home.

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To achieve this, our sash windows and doors are hand built by time served craftsmen to faithfully replicate the original appearance whilst carefully integrating customer requirements to insulate against heat loss, noise ingress, provide insurance mandated security and compliance with Building Regulations. 

For 25 years Refurb-a-Sash have been providing advice & specialist services to owners of period properties and have been continuously recognised for our high level of attention to detail and dedicated customer service.

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We operate from our 13,500 sq ft site in Isleworth and completely control the bespoke manufacturing processes in-house, with our own joinery, glass, paint and finishing workshops. All our installation personnel are PAYE, reference checked employees using our own vehicles and equipment. 

Our products are covered by a comprehensive five year guarantee which has optional insurance backing, and is fully transferable.


Certass Membership

Authorised to provide Certification for compliance with The Building Regulations requirements for replacement windows & doors. The Certass scheme is identical to that provided By FENSA and other Competent Persons Licensing. More info.

Certass Company Vetted

Authorised and accredited to provide Certification for Building Regulation compliance under the Competent Persons Scheme licensed by the Department of Communities & Local Government (DCLG) – further information available here:

Best of Houzz Award

Delighted to be receive Best Of Houzz 2019 Service Award for the number and quality of client reviews listed on Houzz. More info.

IBGs Membership:

An Insurance Backed Guarantee scheme to provide protection of your guarantee in the event of our ceasing to trade and being unable to honour the terms of guarantee. IBGs is an appointed representative of GGFi which is authorised and regulated by the Financial Conduct Authority.

GGF Membership:

Corporate members of the Glass & Glazing Federation for over 20 years, which offers unrivalled GGF consumer protection working to highest professional standards, see

Trust Mark Membership:

We area Trustmark Registered Firm complying with Government endorsed standards including customer care, code of practice and deposit protection, see:

Guild of Master Craftsman:

Members of the Guild of Master Craftsmen and holders of their Certificate of Quality & Service, see

Conservation & Design Award:

Awarded by the London Borough of Richmond for our high standard of work carried out in the Borough

Green Guardian Award:

Highly Commended for our commitment to maintaining the environment by Guardian Newspapers, sponsored by British Gas

The Glazing Arbitration Scheme:

TGAS offers a simple, hassle free way to resolve a dispute over the supply and / or installation of windows & doors, see

London Sash Window Company
1432a Clock Tower Rd, Isleworth London TW7 6DT

“We’ve recently had 12 large sash windows fully refurbished and have been extremely impressed by the quality of the workmanship, attention to detail and customer service.”

Mr C Smith, London

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