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A bay window projects outward from the wall of a house, creating extra internal space inside the room and bringing more daylight into the property than a flat-fronted window can. The angled projection (typically 3, 4 or 5 sections at 30 or 45 degree angles) creates a natural alcove for window seats, reading nooks or display shelving, while adding architectural presence to the front elevation.
We supply and fit bay windows across an 80 km radius of our Rushden showroom, with uPVC bay windows, aluminium bay windows and timber bay window options available in the full RAL colour palette. Every installation includes the structural work needed for the projecting frame.
A bay window is a window assembly that projects outward from the main wall of the building rather than sitting flush against it. The projection creates an angled or curved bay area inside the room, with windows on three sides of the bay rather than just one. The internal floor area extends into the bay, giving you additional usable space without changing the building’s footprint significantly.
Bay windows typically have a central window (often larger and sometimes fixed) flanked by two angled side windows. The angled sides usually open as casement or tilt and turn windows for ventilation. The structural support comes from a sill platform below, a roof structure above, and side wall returns connecting the bay to the main wall.
Several bay window configurations suit different properties and openings.
The classic British bay window style and the defining architectural feature of Victorian terraced and semi-detached properties across the UK. A Victorian bay window typically has three sides with two splayed angles, creating a roughly trapezoid-shaped bay. The proportions and panel detailing reflect the original 1850s to 1900s construction methods.
Edwardian bay windows often use wider angles than Victorian designs, creating a shallower but wider bay area. Common on 1900s to 1920s semi-detached and detached properties. Square bay windows where the projection has 90-degree angles rather than splayed angles are common on Edwardian and early 20th century homes.
A box bay window or square bay window has 90-degree angles where the bay projects from the wall, creating a rectangular bay rather than an angled one. Suits modern properties and renovations where a contemporary geometric look is the priority.
A splayed bay window uses 30, 45 or 60 degree angles where the side sections meet the central section. The traditional Victorian and Edwardian configuration. Available in 3-sided, 4-sided and 5-sided variants depending on the bay width.
An oriel window is a bay window that projects from an upper floor without a structural support from the ground. The oriel design dates from medieval and Tudor architecture and remains a feature of period properties where the upper-floor bay sits on a corbelled support rather than the ground-floor sill.
Bow windows are a curved variant of the bay window concept. Where bay windows project outward in angled sections (3, 4 or 5 sections at clear angles), bow windows curve outward in a gentle arc using 4, 5 or 6 sections at smaller angles to each other. The visual effect is a rounded projection rather than a hard-edged bay.
Bow windows suit Victorian and Edwardian terraced properties where the original window was bowed rather than bayed, and modern properties wanting a softer projection from the front elevation. The structural and installation requirements are similar to bay windows.
Each material brings different characteristics to a bay window installation.
uPVC bay windows are the most popular choice in the UK. The multi-chamber profiles deliver good thermal performance, multi-point locking handles the security, and the powder-coated or foil-wrapped finish lasts decades without painting. Modern uPVC bay windows reproduce the traditional Victorian and Edwardian bay window appearance with current performance.
Our uPVC bay windows are built on VEKA profiles with structural reinforcement at the angles where the bay sections meet, internally-beaded double glazing as standard, and the full RAL colour palette available. Wood-grain foils give the timber appearance for properties wanting bay windows in a heritage aesthetic.
uPVC bay windows typically cost £1,800 to £3,500 fitted depending on size, panel count, glazing spec and colour. The price reflects the multiple windows in the bay assembly plus the structural support work needed for the projecting frame.
Aluminium bay windows deliver the slimmest sightlines and the most contemporary aesthetic. The strength of aluminium handles larger sash sizes than uPVC can, which matters on bay window installations where the central section is often large.
Anthracite grey, matt black and warm white are the most popular contemporary aluminium bay window colours. Best for modern new builds and contemporary renovations of Victorian or Edwardian properties wanting a modernist take on the traditional bay.
Aluminium bay windows typically cost £3,000 to £5,500 fitted.
Timber bay windows give authentic wood character for listed buildings, conservation areas and Victorian or Edwardian properties wanting genuine period materials. Engineered timber construction stays flat over decades while accepting natural stains, oils and the full RAL paint palette.
Timber bay windows typically cost £4,000 to £7,500 fitted.
The proportions, sightlines and operation of bay windows are easier to appreciate in person. Our Rushden showroom has full-size bay window samples in uPVC and aluminium across the popular colours and configurations.
Free no-obligation quotes and free home surveys across the 80 km installation area.
A bay window is a window structure that projects outward from the main wall of a property, creating an angled or curved space inside the room. Bay windows usually include several window sections, allowing more natural light into the home and giving the room a greater sense of space. They are a well-known feature of many Victorian and Edwardian properties in the UK.
Bay window prices depend on the size, frame material, glazing specification, colour, roof or sill details and any structural work required. As a guide, fitted uPVC bay windows often cost around £1,800 to £3,500, aluminium bay windows around £3,000 to £5,500, and timber bay windows around £4,000 to £7,500. A survey is the best way to confirm the exact specification and installation cost.
Bay windows project outward using angled sections, often with three, four or five window panels. Bow windows also project outward, but they use more sections to create a softer curved shape. Bay windows usually create a more defined, angular projection, while bow windows give a rounded appearance across the front of the property.
Yes. Modern bay windows can be energy efficient when fitted with quality double glazing or triple glazing, Low-E glass, insulated frames and effective weather seals. A good bay window installation should also consider insulation around the sill, roof and surrounding structure to help reduce draughts and heat loss.
Bay window installation often takes around two to three days on site, depending on the size of the bay and whether any structural preparation is needed. The full project timeline, including survey, manufacture and installation, is usually longer than for standard windows because bay windows are more complex and made up of multiple sections.
Yes. Bay windows are available in modern colours such as anthracite grey, charcoal, black and other popular finishes, depending on the chosen frame material. White remains a classic option for traditional homes, while grey and black bay windows are often chosen for contemporary properties, extensions and homes where a stronger contrast is wanted.
An oriel window is a type of bay window that projects from an upper floor rather than starting from the ground. It is usually supported by brackets, corbels or structural detailing beneath the window. Oriel windows are often associated with historic, Tudor-style and period architecture, and they are less common than standard ground-floor bay windows in modern installations.
Replacing an existing bay window with a similar new bay window usually does not require planning permission, but adding a new bay window where one did not previously exist may need approval. Planning rules can be stricter for listed buildings, conservation areas and properties where the new bay window changes the external appearance. It is always best to confirm requirements before work begins.
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The full RAL colour palette is available across uPVC, aluminium and timber bay windows. The most-requested colours track UK preferences. White bay windows are the classic Victorian and Edwardian choice. Anthracite grey bay windows lead modern UK colour preferences. Black bay windows are growing rapidly in popularity for contemporary new builds. Chartwell green and traditional cream suit heritage properties.
Grey bay windows in anthracite or charcoal pair well with red brick Victorian and Edwardian elevations, modern render and stone-built properties. Dual-colour finishes give you one colour outside and a different one inside.
Every bay window we supply comes with double glazed sealed units as standard. The double glazing delivers significantly better thermal performance than original single-glazed bay windows on period properties.
Triple glazed bay windows are available as an upgrade for exposed elevations, properties near busy roads, or homes wanting maximum thermal performance. Acoustic-laminated glass is available for properties near busy roads or flight paths.
A double glazed bay window typically costs 15 to 20% more than a flat-fronted window of equivalent total glazed area because of the multiple sealed units needed across the bay sections.
The bay area created by a bay window installation gives you several internal feature options.
A bay window seat is the classic Victorian feature, with cushioned seating built into the bay area at sill level. The seat provides additional seating for the room while making use of the alcove created by the bay. Window seats can include storage underneath for blankets, books or other items.
A reading nook in the bay window area takes advantage of the natural daylight that bay windows deliver. Plants, herb gardens or display shelving in the kitchen bay window or living room bay window areas all use the bay space differently.
Bay windows historically had thermal performance problems because the multiple panels, sill platform and roof structure all created opportunities for heat loss. Modern bay window installations address these problems through several techniques.
The sill platform below the bay includes insulation that reduces heat loss through the floor of the bay. The bay roof structure above includes insulation matching the main house roof. The windows themselves use modern multi-chamber profiles with quality double or triple glazed sealed units. The angle joints between bay sections use structural reinforcement that also reduces thermal bridging.
For Victorian and Edwardian properties replacing original timber bay windows with modern equivalents, the thermal improvement is usually noticeable in the first winter. The reduction in draughts around the bay area is often the most-noticed change.
We install bay windows across an 80 km radius of our Rushden showroom, covering Northampton, Bedford, Milton Keynes, Kettering, Cambridge, Peterborough, Rugby, Hemel Hempstead, Wellingborough, Corby and surrounding towns.
Bay window installations are more complex than flat-fronted window replacements because of the structural work needed for the projecting frame. Our team handles the survey, structural assessment, manufacture of the bay window assembly, the structural support work, removal of the old bay, installation of the new bay, weather sealing and final commissioning.
Installation is FENSA-registered with the certification paperwork supplied at handover.
Bay window installation typically costs £1,800 to £7,500 fitted depending on material, size, panel count and any specialist features. The price reflects the multiple windows in the bay assembly plus the structural support work.
The bay window replacement cost when replacing an existing bay window with a new one is usually lower than installing a new bay window from scratch, because the structural opening already exists and the support framework is in place.
uPVC bay windows take around 6 to 8 weeks for delivery and fitting. Aluminium bay windows take 8 to 10 weeks. Timber bay windows take 10 to 12 weeks because of the timber finishing process.
Installation is typically a 2 to 3 day job for a full bay window replacement, depending on the bay size and any structural work needed.
For properties wanting a bay configuration that also opens out to the garden or external space, bay window French doors and bay window bifold doors are popular options. The bay window French doors combine the angled projection of a bay window with the hinged double-door opening of French doors at the central panel.
Bay window doors typically need wider central sections than standard bay windows to accommodate the door opening, with side windows providing the angled bay sections either side.
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Homeefe Limited is a private limited company registered in England and Wales, company number: 12754601. Registered office is located at: 17 The Precinct, High Street South, Rushden, Northamptonshire, England, NN10 0QU
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