Our strong passion for English Heritage and Skilled Craftsmanship means we do not compromise on the Quality of materials when manufacturing Sash Windows. We ensure we use the highest spec materials available and incorporate the latest Technical Innovations & Techniques into our Joinery.


Browse below over the many material elements that are used throughout the process of designing and manufacturing your Timber Windows.
Timber Sash Windows are items that should be built to last and we achieve that.


At Traditional Sash Windows Ltd we are committed to making our products better by constantly researching new techniques and innovations that translate into a higher quality product. We understand that Sash Windows, whilst have been around for many years and should be made to appear with the same heritage design – should be made with modern materials. We aim not to be a company & product stuck in the past, whilst the past is so very important to us!


We have upgraded timbers which will last longer, we have better more efficient glazing techniques.


We believe using these materials really matters, when keeping your home quieter, warmer and safer for longer.


For free advice and full details on any of our services please contact us. 

Accoya Timber

Accoya® is the world’s leading high technology long life wood, based on wood acetylation. Read More

Responsibly Sourced Tmber

We take great pride in saying that all of our Timber is professionally sourced by leading  Read More

The Most Efficient Glass

PLANITHERM is a new generation of energy saving window glass that uses advanced Read More

Draft Proofing

At Traditional Sash Windows Ltd our design incorporates leading Draft Proof Technology. Read More


Good Quality Ironmongery provides the perfect finish to any Window and Door. Read More

Counterbalance Weights

Amongst the make-up of our Sash Windows we ensure each Sash is perfectly balanced Read More

Sash Cords

At Traditional Sash Windows Ltd we use a pre-stretched, traditionally waxed Nylon Sash Cord. Read More

The Spring-Loaded Mechanism

Sometimes in the existence of Dormer Loft Conversions and Extensions,  Read More

Trickle Vents

In the case of a misty, damp bathroom a Trickle Vent can be a life saver! It is designed Read More

Brushes & Aqua-mac Seals

Aqua-mac is something we install into the bottom of all windows for Weatherproofing Read More

Bullnose & Architrave

We install all our windows to a complete finish. This involves dressing and making Read More

Kiln Dried & End Grain Treated

A good Joiners Eye is imperative for tight joints. Read More

Paint – Primer + Topcoats

We have moved on from the times of hand painting Primer. Over much research Read More

Mastics, Putty & Sealant

When choosing our Full finish Option, we ensure each window is a work of art Read More



All our Accreditations and Certificates establish us as a Safe Contractor for your peace of mind. For free advice and full detail of our services please contact us. 


FENSA is a Government Authorised Competent Persons Scheme for the replacement of Windows, Doors and Roof Lights in England and Wales. In choosing a FENSA Registered Double Glazing Company the consumer is offered greater protection and a 10 year Insurance Backed Guarantee. FENSA is proof of a job done right. FENSA regularly carries out random inspections of Sash Window Installations.

It is a Legal Requirement to register your sash windows installation with the Local Council. Being FENSA Registered means your chosen company is qualified to do this for you. They will provide a FENSA Certificate as proof of the Quality Installation & Registration.


The GGF is recognised by government and plays a large part in influencing new standards and regulations, such as The Building Regulations, the rules that govern and control the way our buildings are constructed in the UK.

When looking for a manufacturer, supplier or contractor for all glass types and glass related products, energy efficient windows or conservatories you should start by looking for a Glass and Glazing Federation Member.


Government Endorsed Quality. When a consumer uses a TrustMark Registered Business, they know they are engaging an organisation that has been thoroughly vetted to meet required standards and has made a considerable commitment to good customer service, technical competence and trading practices.

The Guild of Master Craftsmen

The Guild of Master Craftsman Membership is the wise choice for consumers seeking a skilled and trusted tradesperson. All Guild members are thoroughly assessed to earn the right to be called master craftsmen and they are required to maintain Guild’s stringent professional criteria.

The Forrest Stewardship Council

FSC Labels can be found on millions of products around the world including sustainable made toilet rolls to your favourite book or sustainable Hardwood/Softwood Timber. The Forest Stewardship Council sets standards for responsible forest management. A voluntary program, FSC uses the power of the marketplace to protect forests for future generations.

InstallSure – (Previously known as GGFI)

A Group Company of FENSA. Installsure’s mission is to provide clear hassle-free insurance cover to installers and consumers alike. We listen and advise based on our clients’ specific needs, so we can find them the right cover for the right price.

British Fenestration Rating Council (BFRC)

The British Fenestration Rating Council is the UK’s most trusted rating council for verifying the energy performance of windows and doors. In 1997, BFRC was founded to establish the window energy rating system for the UK, to raise standards and drive performance in the industry. Now the BFRC is Europe’s No. 1 ratings council, with the most widely-used rating system. Proof your products will perform as promised.

English Heritage

English Heritage is a charity that manages over 400 historic monuments, buildings and places. To name one that is most close to our business home would be Battersea Power Station. Others include prehistoric sites, medieval castles, Roman forts and country houses. The organisation plays a huge role in building conservation and our companies values align which is why we are a proud member.


Houzz is the new way to design your home. Houzz Magazine hosts highly skilled award-winning tradesmen along with 20 million interior design photos, home decor, decorating ideas and architectural professionals. Traditional Sash Windows Ltd have been an award winner for 5 years in a row for Design & Service. We offer our most honest and free advice on this platform throughout the year to many browsers & customers alike.

RISA – Inspections & Auditing

RISA (UKAS Accredited) offer independent and impartial Inspection and Auditing services to the Fenestration and Construction Industries in line with relevant legislation. If your FENSA Registration is chosen for inspection it will be this team of professional that will carry it out.

The Customer Protection Association

Consumers and CPA members benefit from Insurance Backed Guarantees, Deposit Protection Schemes and ongoing member assessments to guarantee quality and service. By becoming a CPA member, tradesmen can prove to consumers that they are no rogue builders, rather they are trusted tradesmen that take pride in a job well done. We only deal with proven and accredited installers and we fully vet them for professional competence and integrity, throughout the life of their membership.

The Construction Industry Certification Scheme

The Construction Industry Certification Scheme (CSCS) provides training and assessments to our team of professionals. The trademark is proof that individuals working on construction sites have the appropriate training and qualifications for the job they do on site. By ensuring the workforce are appropriately qualified the card plays its part in improving standards and safety on UK construction sites. You may notice our installers / surveyors wearing their card upon initial survey. This gives you prof and peace of mind the individual is trained in such criteria such as Health & Safety. It also serves as their identity.

The Environment Agency

The Environment Agency is a non-departmental public body, established in 1995 and sponsored by the United Kingdom government’s Department for Environment, Food and Rural Affairs, with responsibilities relating to the protection and enhancement of the environment in England. We are conscious about our environment and are always as cautious as can be regarding our impact on the environment. Whilst our product itself is designed to help home efficiency and limit each households impact on the environment, the way we conduct the work must be green too! We are certified waste carriers which means the waste we remove from your home will be disposed of responsibly,

The Glazing Arbitration Scheme (TGAS)

The Glazing Arbitration Scheme (TGAS) offers a simple, hassle-free way to resolve a dispute with a trader over the supply and/or installation of any Glazing product. The Glazing Arbitration Scheme (TGAS) is an independent ADR (alternative dispute resolution) scheme, which is the primary ADR scheme for the Glass & Glazing industry, plus other glazing related and home improvement products. TGAS is operated by a Chartered Trading Standards Institute certified ADR body, the Centre for Effective Dispute Resolution (CEDR).