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Trade Supply

CERTASS

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.

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GGF

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.

TGAS

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.

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QANW

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.

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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

Very good communication and very professional company. High standard fitting of front door. We had a couple of little issues but they
responded and resolved them promptly and efficiently.

Kirsty Imie

August 28, 2025

Fantastic customer service. Very helpful in advice on the various products offered, how the cost would be affected. We were kept informed
throughout process even down to a reminder a few days prior to installation. The installation process was clean and efficient.

Mr Rifai.

August 28, 2025

Excellent communication throughout both in person and electronically. Lovely team fitting and install. Very happy with the finished product

Gary Lane

August 28, 2025

“I found GWH Windows an excellent company to deal with. The staff were very friendly and easy to deal with. The installation staff were very experienced and did and excellent job. I would recommend them to anyone.”

Mr Nuttall - Burnley

July 31, 2025

“Very efficient from start to finish, great company, I would highly recommend them to anyone wanting replacement doors and windows etc. I will be using GH Windows again for a roof lantern”

Mr Inge - Accrington

July 31, 2025

“We replaced our old wooden porch and door through Great Harwood windows. The whole experience was extremely good. Couldn’t fault the fitters Scott and Sam who were very professional and paid a lot of care to detail. Very tidy. Reasonable price.”

Mrs Wroe - Clitheroe

July 7, 2025

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Get in Touch

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.