We are very proud to say that we have achieved the following certificates and accreditations.

ISO9001 logo

ISO 9001

For the supply and installation of Conservatories, Windows, Doors, Roof Lanterns and Roofline products.

Achieving ISO 9001 has been a major milestone for Thames Valley Windows and will continue to ensure that we are set apart from the rest. Mark Schofield, Managing Director, said, “We’ve worked hard to achieve ISO 9001. It was important for us to make this investment and guarantee our delivery of excellence on every project, large or small.”

This makes Thames Valley Windows fairly unique. Not many window companies can say they have achieved ISO 9001.

BSI Logo

The British Standards Institution

For the survey and installation of windows and external doorsets including energy efficient glazing and doors incorporating the Competent Person Scheme for replacement windows and doors.

This standard is not easy to attain and even harder to keep. We are one of only 33 companies in the UK to hold this accreditation for window and door installation.

GGF Logo

The Glass and Glazing Federation

The Glass and Glazing Federation (GGF) represents companies that make, supply or fit, glass and glazing products in the UK and internationally.

When you use a GGF Member you are guaranteed to be using a firm that:

  • Has financial stability and has been trading for a minimum of 3 years – there are no phoenix companies in the GGF.
  • Has been vetted and has premises, products and employees fit for purpose.
  • Employs trained professionals to ensure your installation is to the highest technical standards as outlined by the GGF Glazing Manual written by the industry’s leading experts.
  • Complies with the GGF Consumer Code of Good Practice which has strict requirements regarding the conduct of Member companies and ensures they comply with all relevant consumer legislation. All GGF Member companies are audited on a regular basis to ensure their compliance.
  • Offers you free access to our Conciliation Scheme in the unlikely event of a dispute with a GGF Member company. Rest assured you will not be left alone – the GGF will help resolve the dispute and if it cannot be resolved (very rare), the Glazing Arbitration Scheme is there to help you reach a resolution.
  • Offers you transferrable warranties – should you sell your property, you can advise the buyer that the guarantee can be transferred over to them by the Member Company who fitted your windows for a reasonable fee.



For the survey and installation of windows and external doors, including energy-efficient glazing and doors incorporating the Competent Person Scheme for replacement windows and doors.

chas logo

CHAS (The Contractors Health and Safety Assessment Scheme)

To qualify for this nationally recognised scheme, companies are required to demonstrate compliance with the Contractors Health and Safety Assessment Scheme (CHAS). It is an authority and trusted advisor on health and safety compliance, setting industry standards for a safe and efficient working environment.

Certification is recognition of Thames Valley Windows dedication to meeting strict health and safety standards throughout every project we undertake.

To find out more about Thames Valley Windows, go to our about page.

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