DG Services Limited are proud to be accredited by the following organisations, which we believe will help you choosing the right supplier and contractor for the work you wish to be carried out.


Which? Certificate


Which service guarantee

Why use Which? Trusted Traders?

Which? has been rigorously testing products and services for nearly 60 years - now they are assessing and endorsing local tradesmen and tradeswomen. Like their well known Best Buy logo, the Which? Trusted trader logo is a sign of reputation and trust; helping consumers choose the right trader for them and giving good traders the recognition they deserve.

How Which? assess traders

Which? Trusted Traders is an endorsement scheme run by Which? that recognises reputable traders who successfully pass an assessment process carried out by their trading standards professionals. Not just anyone can become endorsed. The assessment process includes:

Credit report

This is obtained to validate the financial health of a business who applies to be assessed.

Customer Satisfaction

The Which? Trusted Traders endorsement team will check a selection of customer references from 10 domestic customer details chosen at random by the assessor.

Business procedures

A thorough examination of business and administrative procedures to ensure that businesses have consumer interests in mind.

Interview and assessment

Their standard assessment includes a face to face visit and interview carried out by a Which‘? trading standards professional to fully understand all aspects of how the applicant runs their business.


Businesses receive a report of the assessment, providing valuable feedback from their experienced assessors to ensure that they meet our high standards before they are allowed to join the scheme.

Endorsed trader

Having passed all these checks, the trader is now able to choose to join the scheme, agreeing to abide by the terms and conditions, code of conduct and pay the membership fees. They can now show their customers that they are an endorsed Which? Trusted trader.

Who makes the grade?

Those who don't make the grade don't get endorsed. Due to the high demands of the assessment, not all businesses that apply get through the assessment process. Only those who meet their high standards can become Which? Trusted traders.

If things go wrong

An extra benefit of using Which? Trusted Traders is that they have an independent Alternative Dispute Resolution service, Dispute Resolution Ombudsman, on hand should something go wrong. This problem solving service provides peace of mind for both consumers and traders.

Where DGS cannot resolve any complaints using their own complaints procedure, as a Which? Trusted Trader they use Dispute Resolution Ombudsman for dispute resolution. In the unlikely event of a complaint arising and you wish to refer the complaint to Which?, please contact 0117 981 2929 or via their website

Trustmark Accreditation



Trustmark is a Government-backed standard that operates
across various trade sectors, in our case Double Glazing and
associated work overseen by FENSA and aims to recognise
those companies that go a little further in the levels of service
and conduct they provide to their customers.

The aim is to provide existing and potential customers with the
reassurance of selecting and using an approved company for
their home improvement work.

Each company displaying the Trustmark logo is subject to
ongoing comprehensive assessments by FENSA.

You can find more information at the Trustmark website: and

PWF Accreditation


PWF (Plastic Window Federation)

DG Services are members of the PWF who will act to protect customers should DGServices cease trading.

This is underwritten by an insurance backed guarantee provided free of charge with each DGS installation.

They will/can offer advice with respect to installation methods and offer an independent trade related surveying service in the event of a dispute between DGS and customer.

DG Services membership number is DG3649.

PWF Platinum Certificate


PWF Platinum Certificate


Fensa Accreditation



FENSA stands for the Fenestration Self-Assessment Scheme

FENSA is a national, government authorised self-certification scheme for replacement double glazing window and door installers. This makes your window and/or door installation hassle free, as homeowners who use FENSA registered installers do not have to apply for approval from Local Authority Building Control.

Furthermore, homeowners who use a FENSA registered installer will receive a certificate which acts as documentary evidence that the installation work has been self-certified as complying with applicable Building Regulations, essential for your peace of mind and when it comes to the sale of your property.

To ensure our installations meet requirements, random inspections are carried out by a third party organisation on behalf of FENSA.

Our FENSA registration number is 32823
Their telephone number is 0207 7645 3700

Veka Halo Accreditation


Why Use An Installer Programme Member?

Congratulations! You have made the first step in buying new windows, doors or a conservatory for your home. And what a difference they will make to you and your family... improved security, reduced energy bills, less noise and virtually no maintenance - not forgetting the visual impact - these are just a few of the ways you will benefit from our products.

Our Installer Programme Members demonstrate a commitment to quality by only using industry-leading systems from the world-renowned VEKA UK Group.

You can rest assured that all products fitted by your local Installer Programme Member have been CE Marked and come with an Insurance-Backed Guarantee.

With our new energy efficient frames, your home will be a ‘greener’ home too - by reducing the amount of energy you use to heat your home, our frames will help you to reduce the amount of greenhouse gases you produce.

Our products will enhance your home and your lifestyle. With windows, doors and conservatories in a vast array of styles and colours - you have the opportunity to perfectly tailor them to your needs and requirements.

As your windows are fitted be sure to look for the branded tape, signalling that they are either VEKA or Halo windows.