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At Trade Frame we pride ourselves on our customer first approach. This enables you the customer to benefit from the complete product, service and technical support to meet all your exacting standards.

Which Trusted Trader

As a Which Trusted trader, our business has been through a rigorous application process so you can be confident you are hiring a reputable trader, here is the link to our Which Trusted Trader page

TradeFrame NW Limited Office Address: 9-10 Sankey Bridges Industrial Estate, Liverpool Road, Warrington, Cheshire, WA5 1QQ. Registered in England and Wales – Company number: 06898667


We always endeavor to provide the best service and products for our customers. However, on rare occasions, we recognise that there may be times where our customers may not be completely satisfied. To ensure we are able to put things rights as soon as we can, please read our complaints procedure below and we will respond promptly to ensure complete satisfaction. As soon as possible after the completion of the works, please inspect the work to ensure everything has been carried out to our usual high standards. In the unlikely event there is anything you are not completely satisfied with, please contact us as soon as you can in order that we can rectify any problems as soon as possible. Either call us on 01925 23 23 53, or write to us at Unit 10 Sankey Bridges Ind Est, Liverpool Road, Warrington, WA5 1QQ, or email us at and we aim to respond within 7 days of receiving your complaint and where possible, will provide you with a date to remedy any issues raised.’

Where we cannot resolve any complaints using our own complaints procedure, as a Which? Trusted trader we use Dispute Resolution Ombudsman for dispute resolution. In the unlikely event of a complaint arising and you wish to refer the complaint to them please contact 0333 241 3209 or via their website 


Certass are the specialists in installer certification for the building fabric refurbishment industry.

Finding a skilled, certified installer to carry out your home improvement projects used to be quite a challenge. As homeowners, we all know too well how important it is to make sure you get the best products available, that can be fitted to the highest standards, without any hassle, from friendly, helpful installers.

In 2002, the government made the task of finding a great installer easier. They introduced ‘Competent Person Schemes’, which recognise the high standards and competency of installers within the building industry.

A Competent Person Scheme allows an installer to self-certify that their work complies with all the local Building Regulations. This means that they can complete the work on your home without needing to submit a building notice or having local authorities carry out an inspection, saving you lots of time and money.
The use of Competent Person Schemes helps tradespeople to not only prove their ability to carry out work, but also helps to improve the overall standards of the building industry.

What is covered by our Competent Person Scheme?

The Certass Competent Person Scheme works under the direct license from the Department for Communities and Local Government (DCLG). For the installer to be classed as a ‘Competent Person’, they must be registered with a scheme that’s approved by DCLG.

Our Competent Person Scheme covers two key areas in the building and renovation market – glazing and insulation. These areas cover a whole range of glazing products and services including replacement windows, doors, rooflights and roof windows for homes or commercial properties. As well as insulation services, including external, internal, hybrid and cavity wall insulation.

We also offer certification for other trades within building refurbishment, and these are covered under our Green Deal and TrustMark licenses.

If you choose an installer that’s registered with our Competent Person Scheme, it means that they have all the correct systems in place so that they meet the requirements to self-certify their work and provide the best service and installations for you. These include a skilled and trained workforce, management systems and processes and also consumer financial protection.

Why you should choose a competent installer

By choosing an installer that’s registered with a Competent Person Scheme, you can be sure that they carry out high standards of work and meet all the requirements needed to be classed as a competent installer.
When installers self-certify as a competent person, it helps to ensure the compliance of Building Regulations along with promoting training and skills within the building industry. It can also help property owners to avoid ‘cowboy builders’!

Your Certass certified competent installer will be regularly assessed and inspected. This will include a lengthy on-site audit and a check of all their paperwork to ensure that their business procedures meet government standards.

Once registered, the installer also has lots of access to our industry experts for any help they may need, including technical information and any changes to Building Regulations. Their membership with our Competent Person Scheme means that they can provide you with:

✓ Qualified and assessed tradespeople to carry out your home improvements
✓ An easy way of registering your installation with local authorities, at no extra cost to you
✓ Protection of any deposit taken
✓ A guarantee that covers your completed installation
✓ An insurance backed policy that covers the guarantee even if your installer stops trading

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