Flush Sash Windows

Our heritage flush casement windows are made from uPVC and designed to look like a traditional 19th century wooden frame. They have all the benefits of a modern uPVC window and are available in a range of designs and colour options. Flush sash windows feature mechanical joints that look like authentic carpentry, so are often accepted by planning officers. Whilst they are made for period and conservation projects, the flush exterior has a minimal look that is also suited to more modern buildings and renovations.

Whether you are undertaking a conservation scheme, a newly built home, or a renovation, our Flush Sash Window Upminster System is an ideal choice for any project. The Timberlook PVCu window system effectively imitates traditional and heritage designs, making it a perfect choice for historical and preservation initiatives.

As we are an experienced flush sash windows supplier, our flush sash windows are well-suited for contemporary lifestyles, as they offer energy efficiency and require minimal maintenance. AGS is located in Upminster but operates throughout all of Essex and London including local areas to you such as Romford, Hornchurch, Brentwood, Shenfield, Chigwell, Loughton, Woodford, Billericay, and Chelmsford, and would love to help you with your new project.

Whether you are undertaking a conservation scheme, new build home, or rennovation, our Flush Sash Window Upminster System is an ideal choice for any project. Timberlook is a PVCu window system that successfully replicates traditional and heritage designs, making it ideal for historic and conservation projects. Our flush sash windows are also suitable for modern living, as they are energy-efficient and virtually maintenance free. AGS are located in Upminster but operate through-out all of Essex and London including local areas to you such as Romford, Hornchurch, Brentwood, Shenfield, Chigwell, Loughton, Woodford, Billericay and Chelmsford and would love to help you with your new project.

Technology and materials have been moving forward and developing at a fast pace, creating more energy-efficient windows, with greater longevity, higher security, and better recyclability. We feel that taking a look back occasionally has its merits too. It enables us to preserve the look and feel of our architectural heritage, and to make the most of those designs and aesthetics that were perfected long ago. Our Timberlook PVCu Flush Sash windows are virtually indistinguishable from timber, yet have significant advantages. They are undoubtedly more affordable than real wood, and can have a significant impact on the the comfort and appearance of any property. Those advances in materials and the manufacture process also mean that their insulation performance is better than ever, while being easy to maintain.

  • Much easier and cost-effective to maintain than timber.
  • Wide range of traditional & contemporary woodgrain finishes.
  • Choose from modern or period style handles and furniture.
  • Energy-efficient system with double or triple glazing.

As beautiful as real timber is, it can swell and shrink, or can warp and twist, depending on the weather. Wooden window frames are expensive to buy, and need ongoing care and attention. The cost and time taken to preserve their appearance soon adds up. Timberlook Heritage Flush Sash Windows simply do not need that maintenance.

The flush exterior finish, with square mortise & tenon looks, mimics traditional casement designs. Timberlook boasts a refined internal decoration, marrying modern technologies with traditional looks. Timberlook is an ideal choice for any home or building, with a wide selection of period colours and wood-effect finishes, including woodgrains and textured foils. These colours also include a Smooth Anthracite 7016 Grey finish which matches the most popular aluminium bi-fold door colour.

Once you’ve decided what you want, they can give you an accurate quote. Our craftsmen will then install your Flush Sash windows, ensuring that they fit perfectly.

AGS cover many areas within London and across Essex including Romford, Brentwood, Hornchurch, Upminster, Chigwell, Loughton, Chelmsford, Billericay and Woodford.

The Best Of Both Worlds

Timberlook windows have the perfect combination of a traditional appearance and look, with modern technology, manufacture, and materials - offering you the best of both worlds. Beautiful, accurately recreated, timber heritage windows with all the benefits of the most up-to date PVCu products. Put simply, we re-designed the wooden window for the 21st century.

Flush sash windows can be found in buildings from all periods, owing to their refined simplicity. The understated and minimal appearance fits perfectly in contemporary properties too. It is now possible to get the character look you want from a thermally efficient and secure window. Tradition working with technology.

Our Flush Sash Windows are made in Great Britain by one of the largest fabricators of PVCu & Aluminium window and door system and would be the perfect choice for your own home, maintaining respect for the architecture of the past while preparing your home to last well into the future.

Flush French Doors

The manufacture of the Flush Door differs slightly from that of the window. In order to provide the extra strength required by the larger glass unit sizes in a door, we use a discreet diagonal weld. Every effort has been made to ensure that this does not detract from the overall style, making Timberlook the ideal option for your whole building or renovation project. All doors must open out, but can be fitted with astragal bars, while taller apertures may have a fanlight.

A door system that perfectly complements the Timberlook Heritage Flush Sash Window. Careful to match the look and feel of our traditional PVCu window, the Flush Door is available in the same colour palette and with furniture that mirrors the Standard and Premium Regency ranges available with Timberlook windows. Our open-out doors are fitted with discreet hinges to maintain the heritage aesthetic

Our Flush Sash Windows come with conteporary handles as standard, but can be enhanced with our Premium Regency Furniture. This includes a Dummy Stay, Monkey-tail Handle or a Teardrop Handle. They are all available in a choice of finishes and feature built-in security like key-locking handles, sash locks, and child safety restrictors. Our furniture options will only enhance the authentic frame proportions and the chamfered edges that replicate putty lines.


The Timberlook range of colours and finishes have been carefully selected to complement buildings of any age. There is something to suit any project, no matter the type of stone, brick, or mortar or location whether it be Upminster, Hornchurch, Romford, Brentwood, Shenfield, Loughton, Woodford, Chigwell, Billericay or Chelmsford. Our selection of woodgrain effects include oak and rosewood. There are grey finishes for more modern homes, including the anthracite foil that works well with modern aluminium windows and doors. Chartwell Green has always been a popular choice, but one of our favourites is the grey-green Painswick colour. We can also accomodate dual-colour options, to help match with existing decor.

Timberlook is the new Flush Sash Window system that boasts a square mortise & tenon looking fabrication for both the sash and outerframe, instead of the tell-tale mitred joints that would normally identify a window as being fabricated from PVCu. Additionally, Timberlook has a 70mm back-to-front frame size to make installation faster, a slim 60mm sash to replicate a timber sash, and a night latch as standard.

Completing the look

There is more to completing a successful renovation or building project than choosing the right windows. As specialists we have a wide range of products that can be perfectly combined for your project. Choose from sliding or bifolding aluminium doors to really open up a space and bring the outside in. The strength to weight ratio of aluminium allows us to accomodate large glass units, with fewer and slimmer sightlines, flooding your rooms with light and increasing the sense of space.

Our aluminium rooflights and lantern systems can add to this effect, with minimal sightlines and unobstructed sky views. Composite doors are an ideal solution for entrances, with styles and colours that maintain the integrity, look, and feel of the Timberlook Flush Sash and your heritage project.

By matching colours and finishes, we can ensure that the overall aesthetic is both visually pleasing and consistent.

  • 10 Year Guarantee
  • Made in Britain
  • Accredited levels of security
  • BBA Certified Products
  • Professional Installation

Romford, Brentwood, Upminster, Hornchurch, Chigwell, Loughton, Chelmsford, Billericay, Woodford and Throughout Essex