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Bay Windows

Transform your home with a beautiful bespoke bay window. Available in four different structural and non-structural bay designs in uPVC, wood and aluminium, our bay windows are made-to-measure in a range of colours and finishes.

Choose between a traditional splay bay, square bay, single-end bay or a curved bow window configurations. Our windows are made in Britain and come in double and triple glazing options depending on the bay window frame material.

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Bay and Bow Window Configurations

  • Splay Bay

    When you imagine a bay window, it’s likely to be a splay bay that springs to mind. Made up of three or more panes, a splay bay window has a central window and two splayed side windows which usually open from the top.

  • Single-end Bay

    Made up of two panes connected at an angle of up to 90 degrees, a single-end bay window adds more light than a window that sits flush with the wall line. It is a fun and stylish feature ideal for smaller properties.

  • Bow Window

    Bow windows - also known as circular windows and curved bay windows - are comprised of five individual panes in a semi-circle configuration which can be both structural and non-structural. This curved design creates the perfect place to relax and enjoy the panoramic view.

  • Square Bay

    Usually made up of three or more window frames joined in the corners at a 90-degree angle to the wall, a 1930s style square bay or box window shape is ideal to create an internal window seating or storage area.

Choose from a Range of Bay Window Styles

Bay Window Materials

We offer bay windows made of uPVC, wood, and aluminium. When you ask for a quote, it includes a free survey, delivery, and installation. There are no hidden costs. Begin your bay window replacement project with us now.

White uPVC bay window interior

uPVC Bay Windows

uPVC bay windows are our most popular option. They come in casement, flush casement and sash styles. You can choose between double or triple glazing with a wide range of colours. These windows are secure, energy-efficient, practical and affordable.

  • Up to A++ rated
  • Double and triple glazing
  • BBA accredited to last 35 years

Wooden Bay Windows

Wooden bay windows come in casement, flush casement or sash styles. You can choose painted or stained colour finishes for modern or listed homes. Timber bay windows are excellent natural insulators. They are great at helping to save energy.

  • Up to A-rated
  • 200+ colour choice
  • FSC®-Certified wood
White aluminium bay windows with back door

Aluminium Bay Windows

Casement aluminium bay windows are slim and stylish. They have strong frames and powder-coated finish. This makes them a great choice for modern homes. The windows are secure, durable and have insulated, thermally efficient frames.

  • Slim, durable frames
  • 200+ colour choice
  • Lead and decorative glass options

Reasons to Choose Bay Windows

  1. Adds Value

    Bay windows are a desirable feature of old and new properties, increasing light, space and style. Strong, high-quality materials with high energy ratings means installing bay or bow windows can increase the value of your home. A solid investment in any material or style.

  2. Colours to Match your Style

    Whether you choose uPVC, aluminium or timber, there’s a bay window frame colour to match your home. Select from more than 200 RAL colours in wood or aluminium as well as the usual selection of classic shades in uPVC, including a dual colour option for a different shade on the outside to the inside.

  3. Secure and Practical

    Accredited by the British Standards Institute (BSI), our bay windows are designed with security and practicality in equal measure. Our window frames have multipoint locking and key locking handles as standard.

Anthracite grey uPVC bay casement windows with front door

Working with the Best Industry Bodies to Install the Best Bay Windows

  • British Board of Agrement accreditation for uPVC windows from Anglian Home Improvements

    BBA Certificate for uPVC windows

    The British Board of Agreement provides independent accreditations for the construction industry. BBA-certified products are synonymous with quality. This accreditation covers our White Knight uPVC casement and tilt and turn windows.

  • BFRC logo


    The British Fenestration Rating Council (BFRC) verifies the energy performance of windows and doors in the UK. Installing BFRC rated energy-efficient windows will help save money on your energy bills.

  • bsienhancedsecurityofwindows2x

    BSI Kitemark

    The BSI Kitemark™ is one of the most recognised symbols of high quality products and safety standards. Anglian has 10 Kitemark accreditations, with six for windows alone.

  • BSEN12608 Windows and Doors accreditation


    British Standard BSEN12608:2003 Licence No KM 12876 - For colour fastness, impact resistance and corner strength uPVC frames.

  • FENSA logo


    The Fenestration Self-Assessment Scheme (FENSA) ensures replacement window and door installations comply with building regulations for England and Wales. You receive a FENSA certificate to keep as proof of compliance.

  • Glass and Glazing Federation logo


    Anglian is a leading member of the Glass and Glazing Federation (GGF). The GGF is the most influential Trade Federation in the industry, recognised by government for their in-house technical expertise, which helps influence key legislation within our sector.

  • Made in Britain logo

    Made in Britain

    The ‘Made in Britain’ marque on all our products means they are made from start to finish in a British factory by British craftspeople.

  • Recovinyl Plus logo

    Recovinyl Plus

    Recovinyl is an initiative advancing the sustainable development of the European PVC industry by improving production processes, minimise emissions, develop recycling technology and boost the collection and recycling of waste.

  • TrustMark

    TrustMark is a not-for-profit organisation operating a quality mark framework in the repair, maintenance and improvement sector. Registration with Trustmark demonstrates commitment to customer service, high standards and continual improvement.

Compare Bay Window Energy Ratings

B rated
A rated
A + rated
A + + rated
uPVC Bay
Wooden Bay
Aluminium Bay
U-Value of 1.4W/m²K

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10-year Guarantee

A 10-year parts and labour guarantee is included in your Anglian double glazing price.

Made in Britain

Made in Britain

Our products are made from start to finish in a British factory by skilled craftspeople.

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Price Match

If you find cheaper like for like uPVC windows elsewhere, we'll match the price.

Decide if Bay Windows are Right for your Home

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Your Questions Answered by us

What are bay windows?

Bay windows are usually made up of three or more window panes, extending outwards in an arc or square to create a feature window. It provides extra internal space, floods a room with light and the curved design makes for impressive panoramic views.

How much is a bay window?

The cost of having a bay window installed varies depending on the material you choose, the size, style, whether it is structural or non-structural other individual requirements for your home. It also depends which supplier you go with, our design team provide you with a unique quote, and how much you pay includes the in-home or remote visit, professional survey and installation.

What is the difference between a bow and a bay window?

While you'd do well to tell a bay and a bow window apart at first glance, there's a simple way to tell the difference. A bay window is usually comprised of three panes with a fixed central pane and an angled window to each side that opens. Whereas a bow window might be made up of four or five panes and tends to be rounded, so it appears like a half-circle from the exterior.

What styles do bay windows come in?

Bay windows come in several styles, including splay bay, single-end bay, a bow window and a square bay. In addition to their shape, bay windows also come in structural and non-structural styles. This means they are either load-bearing or a purely decorative window. We offer bay windows in casement, flush casement, sash and cottage styles.

Do you need planning permission for a bay window?

If you are replacing an existing bay window then it is likely that you will not need planning permission. But this may be different if you are adding a new one to a room or if you live in a conservation area and you have a listed building. Before embarking on any project it is important to consult with your local planning authority or if you go through a supplier like Anglian, we take care of any planning permission requirements for you.

What is an Oriel style window?

An oriel window is like a bay window, but it juts out from the wall. Cantilevers or corbels joined to an external wall support the structure, instead of walls linked to the ground. In the past they improved views on narrow streets, often so people could see down to the sea. Modern oriel bay windows sit on the ground floor, first or second floors, and sometimes even span two floors. We offer oriel windows, but we call them plant-on windows.

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Our Accreditations and Licenses

  • British Board of Agrement accreditation for uPVC windows from Anglian Home Improvements
    The British Board of Agrement provides certification on the quality of our products.
  • Anglian’s PVC-U Casement and Tilt & Turn windows have enhanced security performance.
  • BFRC logo
    The British Fenestration Ratings Council is the UK’s national system for rating energy efficient windows.
  • FENSA logo
    The Fenestration Self-Assessment Scheme ensures window installers comply with buildings regulations in England & Wales.
  • FSC standalone logo TIF green
    Look for our FSC® certified wooden window and door products on our website.
  • Glass and Glazing Federation logo
    Anglian is a leading member of the Glass and Glazing Federation (GGF).
  • Recovinyl Plus logo
    PVC Industry initiative to improve manufacturing, minimise emissions and develop recycling practices
  • TrustMark is a government endorsed not-for-profit organisation that operates through more than 30 scheme operators.