Timber Sash Windows

The standard specification is listed below, however if you have specific requirements these can be discussed and a solution found.

Please check the glossary of terms or if you are unclear about any terminology you can download the product manual, technical details or buyers guide by following the links at the bottom of this page.

Manufacturing Standards

All Bygone Collection Wooden Sash Windows are manufactured in a state of the art factory to exacting standards. Craftsmen then assemble and finish each one to British Standard 644.


As a discerning customer, sustainability is important to you, so you’ll be reassured that Bygone Collection Wooden Sash Windows are manufactured from 100% Forestry Stewardship Council FSC Chain of Custody (CoC) European Redwood for your peace of mind.

CoC tracks forest products from one certified supplier to another, back to forests with a Forest Management Standard.

All our timber profiles are made from high performance laminated timber to ensure strength and consistency, as well as the long-term durability you would expect from a fully engineered product. We use corrugated fasteners to glue and pin all joints

Hardwood Sash Windows


Bygone Collection Wooden Sash Windows offer you significant environmental and durability advantages over traditional vacuum impregnated joinery products.

All windows are treated with Boron wood preservative. Unlike vacuum impregnation, this occurs naturally, so is environmentally friendly. The treatment comes with a 30 year guarantee against rot and fungus with routine use.


Unlike other materials, wood is easily chipped or dinked. While every care will be taken, occasionally small areas of damage will occur and will not affect the performance of the window. We will of course repair and recoat any such damage.

We use factory applied, high performance, microporous, water-based coatings. These are environmentally friendly and come with a ten-year guarantee. We offer stain finishes with a five-year guarantee.


We manufacture sealed units to EN1279. They come with a five year guarantee. Sealed units have 5mm between their edge and the sash timber. Glazing is 4mm, low iron 16mm, Argon gas, Thermiz spacer bars: 4mm Soft coat Low E en.040.


Windows are internally beaded for maximum security. We offer an exterior ‘puttyline’ effect and an attractive ovolo internally.


We offer flush, standard, sub and extended cills to match the precise requirements of your property, the installer will talk you through the requirements for your property.


All Bygone Collection Wooden Sash Windows are fitted with bespoke furniture, unique acorn design is used on both cams catches and tilt knobs and you have the choice of three rich colours.

  • Chrome
  • Pewter
  • Antique Brass

While the weights and pulleys window has the traditional mechanism, all spring-balanced windows are fitted with heavy duty “Torso” spring balances. They come with a guarantee while you live in your home which may be transferable should you sell your property.

If you're ready to know more, would like to see a sample, discuss your options in detail or obtain a free assessment for the costs for your project, then please complete the enquiry form.

You can find an approved local premier partner here, who'll happily explain your choices and provide a no-obligation, fully detailed, written proposal.

If you prefer some answers now, please type your question into the chat box on the right hand side or simply call our free phone number, we'll happily help you resolve your sash window problems.

Further information:

Buyers guide

Take a look at the bygone byuers guide

Download now >

Product manual

see the full bygone collection manual

Download now >

Technical details

Download the bygone technical details

Download now >

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.