Replacement Double Glazed Windows

Choose attractive, durable and weather resistant replacement double glazed windows that complement the rest of your home.

When you are looking for new windows, doors or a conservatory for your home you need a local company you can trust. Our years of industry experience and impressive credentials mean you can completely rely on us at every stage of the process, from selection to installation.

Bricks and motor may form the foundations of your house, but it's the doors and windows that really create your home's personality.

uPVC Windows

With our comprehensive range of high quality uPVC windows, you can be sure to find the products that will suit your individual style. With minimal maintenance, and maximum durability, they'll suit your lifestyle too.

As well as adding to the look of your home, your double glazed windows need to offer you protection - both from unwanted visitors and the elements. Our state of the art window locking systems will enhance your home's security and give you extra peace of mind.

We'll help you select the products that are right for your home - whether you are looking for a simple, elegant style, or a more ornate design, with decorative glass and handles.

Replacement Windows

We all want the best from replacement double glazed windows. That's why our windows stand apart. From styling to performance to saving energy, our advanced window designs give you a comfortable, secure, energy efficient home

Our double glazed windows are filled with argon gas, which reduces conductive and convective heat transferred.

Up to 80% of energy loss through a window can occur at the edge. Conventional aluminium spacer bars conduct heat out and cold in, and have exceptionally high thermal energy loss. We use a warm edge spacer bar, which reduces heat loss at the edge of your replacement windows by up to 94%. Double glazed windows fitted with warm edge spacers have an internal temperature of up to 65% warmer, reducing condensation on your sealed unit by up to 70%. This reduction in moisture virtually eliminates the chance of mould growth and potentially harmful bacteria.

Our replacement windows have softcoat low e glass, a transparent metallic coating, which reflects heat back into your home. The coating also allows heat and light from the sun to pass through the glass, warming your room, adding to the efficiency of your windows.

We also use low iron glass, which produces a higher light and energy transmittance.

double glazed windows

Flush Sash Windows

The latest development from our window manufacturer, the flush sash casement window, offers the aesthetics of a traditional post-1932 timber window combined with 21st century thermal benefits offered by our multi-chambered lead free uPVC windows.

With sash fitting flush into the frame, this brand new concept in window technology is capable of achieving an A+ window energy rating and is ideal for a traditional building, particularly when foiled with one of the woodgrain finished available.

The sash window offers total versatility depending on the finish and colours chosen. The fully sculptered window in grey, for example, delivers a clean, modern appearance suited to more contemporary building styles.

Available in a sculptured profile with a flush finish on external faces and 28mm double glazing, our flush sash windows are internally beaded and come with a wide choice of opening configurations, colours, finishes, hardware and glazing options, with georgian bars also available.

double glazing sealed unit

Stained Glass Windows

As a material stained glass is glass that has been coloured by adding metallic salts during its manufacture. The coloured glass is crafted into stained glass windows in which small pieces of glass are arranged to form patterns or pictures, held together traditionally by strips of lead and supported by a rigid frame.

Stained glass is still popular today, but often referred to as art glass. It is prevalent in luxury homes, commercial buildings, and places of worship. We are often contracted to create beautiful art glass ranging from domes, windows, splashbacks and so on.

We Install Triple As Well As Double Glazed Windows

Our triple glazed windows have an incredible U value of just 1.0 as standard, and a BFRC energy rating of A+ 16. This can be easily upgraded to A+ 20 by changing the external pane of glass from clear float to low iron glass.

Radiators are nearly always positioned directly below a window, so it makes sense to strongly consider the insulation performance of the window directly above it. Our triple glazed window will enable you to save more of the energy that you have personally paid for.

triple glazed windows

An additional benefit of triple glazing is improved noise reduction, with the standard specification achieving a superb decibel rating of 32. The bubble gaskets used within the window are also beneficial with regard to noise reduction.

A triple glazed window has three panes of glass to protect your property, providing an extra barrier compared with two panes of traditional double glazed windows.


  • Coastline Windows
  • Unit 14,Chaucer Industrial Estate
  • Polegate, East Sussex
  • BN26 6JF
  • Tel: 01323 488700
  • Fax: 01323 487111


Coastline are professional suppliers of windows, doors and conservatories in Sussex and the South East. We pride ourselves in the quality of our service and product while retaining a competitive pricing policy.

We have one of the widest ranges of Double Glazing in Sussex, providing our customers with a huge selection of options for conservatories, porches, doors and windows in Sussex.

We appreciate that home improvements can be a big step, which is why Coastline believe in ensuring every one of our customers gets the friendly, professional and personal attention that they need to be confident that they are choosing the right products and service for their property.

Contact Coastline today for a no obligation consultation about your plans and find out how we can help with all requirements for conservatories, porches, windows and doors in Sussex.

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"Efficient, courteous and do a great job...."

All in all a very professional company indeed.

Mr and Mrs S, Eastbourne, East Sussex