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Broomfield porch

Replacement Sash Windows in London

We have over 30 years of experience in the restoration, repair and re-instatement of period sash windows, casement windows, doors and joinery. We offer an unrivalled level of quality craftsmanship and service for discerning homeowners and clients. We are workshop based craftsmen and take great pride in the quality of anything we produce and fit. Only traditional methods and the best quality timber and materials are used. The quality and attention to detail is never compromised.


Quality Workmanship

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Bespoke Design

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Expert Advice

Transform Your Home

We can completely transform the exterior of your home with bespoke windows, tailored to your requirements.

As well as replacing or repairing windows and doors, we can redecorate, recreate panelling, make new panel shutters and even renovate brickwork and stonework.


At DMI Sash Windows, all of our period window work is carried out by highly qualified, professional craftsmen.

Our list of services includes:

  • Sash and casement windows

  • Renewal, replacement and repairs

  • French doors, supplied and fitted

  • Double glazed units

  • Draft proofing

  • Existing window overhauls

Broomfield window

Why Choose DMI Sash Windows in London?

  • At DMI Sash Windows, we offer free estimates on all jobs so that you know exactly how much it will cost you before we begin any work.

  • All our work is fully insured and guaranteed so that you can have peace of mind that should the worst happen, you will be covered.

  • We're experienced and knowledgeable craftsmen with a passion for providing a flawless service and will work with you to ensure you receive the windows you always dreamed of.

  • Transform your property today with DMI Sash Windows in London. For more information, contact us today.

Begin your home transformation with brand new sash windows

Call us on 020 8245 8627 or 07970 440006


very pleased customer

We are very happy with all the carpentry work DMI did in our house. I have since recommended them to a few of my friends. DMI were able to think creatively about the job and came up with good suggestions on how we could improve the end result. Their service was friendly and accommodating, they took great pride in finishing our job to the highest standard. Thank you.

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