GHW Windows are members of CERTASS, CERTASS is a Competent Person Scheme gives installers the chance to self-certify their work and ensure it complies with all the local Building Regulations. This means they can work on your home without the need for an inspection from local authorities, saving both time and money.

These schemes help tradespeople prove their ability to do work, and consequently drive up the standards of the building industry as a whole.


As a member of the Glass and Glazing Federation (GGF), as a business we have been recognised for our commitment to providing high quality installations within the glass and glazing sector.

GGF are the major authority, promoting best practice and sets the highest technical and health and safety standards across the industry. The GGF is a government recognised authority and is influential in the new standards and regulations such as the  Building Regulations 2022. This ensures homeowners across the UK are protected and up to date with the latest home renovation techniques.


The Glazing Arbitration Scheme (TGAS) is an independent ADR (alternative dispute resolution) scheme and the primary ADR for the Glass & glazing industry. As a member of TGAS in the unlikely event that you the consumer are unsatisfied with the service provided, TGAS will step in as a fair and impartial arbitrator to evaluate the case without the need for lawyers or face to face meetings. This allows for a cost and time effective solution for all parties involved.


Great Harwood Windows is a business with a Quality Assured National Warranties (QANW) backing. A fully regulated insurance provider, ensuring that insurance products are delivered every time to provide homeowners across the UK with peace of mind when considering their home renovation projects including, double glazing, conservatories, windows, doors and roofline products.

Trustmark registered

Being registered members of Trustmark, we have demonstrated our continuous commitment to delivering the highest standards of customer service, trading practise and technical ability.
Being the only Government Endorsed Quality Scheme in the UK, you can rest assured you’re in competent hands with a Trustmark registered business. Any business given Trustmark approval has been thoroughly vetted and monitored to ensure they maintain the necessary standards in technical competence, trading practise and customer service so that homeowners can make informed decisions without bias.

external view of a house with a garage and black composite front door

Find out more about our fully accredited glazing products

Accreditations help to give homeowners peace of mind that they are working with a professional and reputable company. Click on the links below to find out more about our range of fully accredited glazing products.

Composite door vs aluminium doors

Spitfire aluminium doors

Conservatory roof replacements

Full house installation with flush sash windows

A huge thank you to Scott and Damien for doing an amazing job installing my windows. They were prompt, attention to detail and cleaned up after themselves. Nothing was too much trouble. I have no hesitation in highly recommending the team at GHW – thank you. 😃

February 6, 2024

“We had an old set of wooden garage/workshop doors replaced with a set of aluminium framed bi-folding doors. Communication throughout was great and it was quick and easy to get a quote and then set a date for the work to be carried out. The installers were extremely friendly and professional, and we couldn’t be happier with the work they carried out.”

Mr Pilling

February 2, 2024

“It has been a brilliant experience and we will definitely be return customers when we are replacing all the remaining windows in our house refurbishment.”

Mr Pilling

January 10, 2024

“All of the installation team were great. A special mention goes to Chris who was there throughout and who’s skills, professionalism and courtesy was second to none.”

Mr Green

January 10, 2024

“Fantastic service including after sales from start to finish. Definitely recommend GHW to anyone plus , will use them again when we replace some windows”

Mr Inge - Oswaldtwistle

November 21, 2023

“Great service and great customer service from the fitters and good quality product.All round excellent experience”

Mrs Buck

November 21, 2023

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Based in the heart of Lancashire

Situated in the very heart of Blackburn, we are readily capable of providing the people of East Lancashire and surrounding areas with a range of UPVC, composite and aluminium products. Whether for personal or trade purposes, realising your aspirations are only one step away with Great Harwood Windows team.