Guarantees, Guaranteed

We know our installers well

We restrict the sale of Bygone Sash Windows to our national network of Premier Partners. Bygone windows can't be installed by anyone not featured this website and we have existing relationships with these companies so you can be sure they meet the standards we expect them to uphold.

We select, train and monitor our partners carefully so your Bygone Sash Windows are installed and finished to the highest standards. 

Don't forget that our partners are individual companies in their own right and as such they offer a variety of compliance methods from installer to installer.

Competent Persons Scheme

Most of our premier partners are FENSA registered, with FENSA being the largest competent person’s scheme. Installers register jobs to confirm they have followed the building regulations correctly, but that’s it, they do not regulate quality so we are obliged to do this ourselves.

Other than FENSA, installers can choose to register work via Certass, BSI or directly with Local Authority Building Control.

Insurance Backed Guarantees

The Government wants to ensure that all consumers have or at the very least are offered, insurance backed guarantees for protection should a company fail. It is unlikely to happen but some people feel more comfortable knowing they have an insurance policy for this event.

Deposits, work in progress payments and product guarantees can all be insured either directly with your installer as a policy or via their membership of other organisations.

There are many, including the Glass and Glazing Federation (GGF), GGFi, the Double Glazing & Conservatory Ombudsman Scheme (DGCOS), the Consumer Protection Association (CPA), and the Federation of Master Builders (FMB).

Many include these insurance policies for free as they are normally less than £50, but this varies with the value of the contract.

Ombudsman scheme and arbitration services

There isn’t an official or government appointed ombudsman for the industry. Instead two organisations, Double Glazing & Conservatory Ombudsman Scheme (DGCOS) and The Glazing Ombudsman (TGO) each have an ombudsman to resolve issues their members cause with consumers.

However they only deal with complaints about members, so if you have concerns, then it’s worth checking that the installer belongs to these organisations. The GGF also has a conciliation service to help consumers using member companies find solutions.

Assurance of Workmanship

We don’t guarantee windows that we don’t make ourselves, but if an installer falls short of your expectations or causes any kind of distress or problem with the installation, we will actively try to find a solution.

It’s very rare to have a problem that installers are unable to resolve amicably; in 25 years of trading we have only ever had three issues where clients thought the installer could have done better and required third party intervention.

However, we have terminated the Bygone membership of a few rogue installers who failed to address customer complaints in an appropriate fashion, cancelling their Bygone accreditation and terminating any further supply of Bygone Sash Windows.



You can expect the installer to deal with any issues quickly and efficiently - If they don’t or for whatever reason they happen to cease trading, we’ll appoint another Premier Partner to finish the job at the original cost so you’re no worse off.

As well as guaranteeing our installers workmanship we also offer our own manufacturer’s warranty, so you’ll be twice as risk-free.



Please ensure you check that the installer is on our list of genuine companies otherwise you may find they aren’t Bygone Sash Windows you are getting and therefore not guaranteed by us.

It is not unusual for unknown installers to our network, to sell substandard products to unsuspecting customers and pass them off as Bygone.

Always look for the Bygone logo on your window furniture.



  • To be offered deposit, stage payment and 10 year warranty insurance
  • The work to be compliant and registered with a competent person scheme
  • A certificate of compliance, confirming your windows comply with current building regulations
  • To be issued with an installation guarantee
  • To be asked to provide feedback on how installers performed

The Bygone Collection issues you a product guarantee and a Care and Maintenance booklet upon receipt of your completed customer satisfaction survey.

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What makes bygone sash windows so authentic?

Find out more >

Featured sash windows

  • Non Bar

  • Full Georgian

  • Half Georgian

  • Georgian Varient

  • Centre-Bar

  • Three Light

  • Marginal Border

  • Marginal or 'Off-Set'Three Light

  • Asymmetric

  • True Arch

  • Swept Head

  • Coupled Style 2

  • coupled Style 3

  • 1/3rd split

Sash window styles have changed in the last three hundred years but you can select whichever suits your home best.

Here are a few ideas >

Request A Call Back 

One of our friendly advisers will call you back to discuss your requirements in detail

Submit >

"I was not asked for a large deposit and only paid the balance once all the work was completed and checked"

"This was all backed by a scheme to safeguard my money"

"See you for the next installation"

Mr 'S.A' - Essex

These sash windows are only sold through our national network of premier partners, all of whom are certified and approved Bygone sash window installers




Locate your nearest premier installer for a free quote


Accreditations >

Learn why you get better windows because of these

  • BBA - British Board of Agrément Certified
  • ISO 9001:2015 Certified Organisation
  • SBD - Secured By Design Approved Windows
  • British Fenestration Ratings Council - A Rating
  • Energy Savings Trust Recommended Windows
  • CE Compliant Windows
  • All Bygone windows are manufactured in the UK

Request a Quotation

Would you like to see a sample, discuss your requirements and options, or obtain an assessment of the costs for your project?


If you would like a copy of our brochure please click the download button at the bottom of this page.