Cortizo · SUPPLY ONLY

Cortizo
Aluminium Bay & Bow Windows

Name: Cortizo Aluminium Bay & Bow Windows
Brand: Cortizo

Aluminium bay windows and bow windows for replacement openings, extensions and new-build projects. We supply made-to-measure arrangements across England and Wales, with the available Cortizo system and junction details confirmed for your design.

Aluminium frames give a contemporary finish to projecting glazing. Specify an angular bay or a gently faceted bow, with the colour, pane layout and opening requirements matched to your drawings.

Open the shop Send bay drawings

Bay and bow arrangements need a project-specific price. Send drawings or photos so we can check the layout; a flat-window shop price does not cover a complete bay.

DOWNLOAD BROCHURES

Spectus Cortizo Hallmark

aluminium bay windows — illustrative architectural design — Illustrative image — exact product and finish confirmed with your quotation.

AT A GLANCEOptions to shape around your project

Bay or faceted bow designs

Thermally broken aluminium systems

RAL powder-coated finish choices

Fixed and opening panes by system

THE RANGE

Designed around the opening.

Aluminium bay windows combine glazed frames at defined angles. Aluminium bow windows use a series of shallow-angle facets to create a gentler outline. The selected window system must support the required connections, sizes and opening types.

Tell us the appearance, operation and practical priorities for your project. We will confirm which available system and configuration is appropriate before you order.

Manufacturer information: Cortizo window systems ↗

PHOTO GALLERY

Aluminium Bay & Bow Windows in detail.

aluminium bay windows — anthracite aluminium bay — illustrative design — Anthracite aluminium bay — illustrative design

aluminium bay windows — anthracite aluminium faceted bow — illustrative design — Anthracite aluminium faceted bow — illustrative design

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Images are illustrative of the product type. The exact style, colour and glazing are confirmed with your quotation.

BAY & BOW WINDOW PRICES

Price the whole bay, not just the glass.

aluminium bay window prices depend on the number and size of frames, their angles, opening panes, finish, glass and connecting components. A flat-window price is not a price for a complete bay or bow.

Send a plan view, elevation and photographs through our Contact page; PDF drawings and window schedules are welcome. We will confirm the available configuration, what is included, VAT and delivery before you order. Installation and structural work are not included.

Send bay drawings Open the shop

Cannot find your bay layout in the shop? Contact us before pricing separate frames or placing an order.

01Plan view with each facet width, angles and projection

02Elevation with overall height, panes and opening directions

03Bay posts, coupling details, cill and roof requirements

04Internal plasterlines, supports and delivery postcode

MEASURE & CHECK

A bay needs more than width and height.

A professional survey should record every facet, the bay angles, projection, internal plasterlines and the chosen cill. Do not apply a flat-window deduction to the overall bay width and assume the individual frames will fit. Your installer must agree the complete manufacturing dimensions and connections.

Some existing bays carry loads from the roof or structure above. Before removing anything, have a competent installer assess the existing support and whether structural advice or temporary support is needed. New projecting openings also need their roof, base and planning requirements checked.

Read our window measuring guide

The guide covers ordinary opening checks; it does not replace a bay-specific survey.

BUYING QUESTIONS

aluminium bay & bow windows explained.

What is the difference between bay and bow windows?

A bay generally has a prominent central section and angled side sections. A bow usually has more similar-width sections joined at shallow angles to create a gentler curve. The photographs show illustrative examples of both.

Can I replace my existing bay?

A replacement needs to match the surveyed opening and support requirements. Send photographs and drawings so the available system, connections and dimensions can be checked before manufacture.

Are these supply-only windows?

Yes. PVC Windows Online supplies the windows; you arrange surveying, installation and any structural work. Frame connections, posts, cills and glass should be listed explicitly in the agreed quotation.

How long will my order take?

Lead times depend on the system, finish and configuration. We confirm the lead time for your exact specification with your quotation before you commit to an order.

Contemporary aluminium bays

An anthracite, black or lighter RAL finish can coordinate a bay with other aluminium windows and doors. Agree the frame system and junction posts first: the visible sightlines are determined by the complete assembly.

Faceted aluminium bow windows

A bow layout uses flat window sections with shallow-angle connections, not necessarily curved glass. The number of facets, projection and permissible connections must be checked for the selected aluminium system.

Thermal performance by design

Thermally broken frames reduce heat transfer through the aluminium. The finished U-value depends on the selected system, glass, dimensions and junctions; ask for performance information for the exact configuration quoted.

ENERGY PERFORMANCE

Energy ratings explained.

Aluminium windows rely on a thermal break and the glass unit for their energy performance. Slimmer sightlines mean more glass, which makes the unit specification especially important.

Thermal break

Cortizo aluminium systems use polyamide thermal breaks between the inner and outer frame to reduce heat transfer through the metal. Frame depth and the break design vary between systems.

U-values by system

Cortizo publishes thermal, acoustic and weather-test results for specific system configurations rather than for aluminium as a whole. Deeper systems such as COR 80 are aimed at the lowest heat-loss figures.

Glass does the heavy lifting

Double or triple units, low-emissivity coatings, argon fill and warm-edge spacers usually make the largest difference. We will confirm the achievable figure for your chosen configuration.

COLOURS & FINISHES

Choose the finish.

Cortizo aluminium is powder coated to your chosen RAL reference, with matt, satin, textured and wood-effect finishes available across the range. Dual-colour frames allow a different internal and external finish.

RAL 7016 Anthracite

RAL 9005 Jet Black

RAL 9010 Pure White

RAL 7015 Slate Grey

RAL 9007 Grey Aluminium

RAL 6009 Fir Green

RAL 8019 Grey Brown

RAL 7039 Quartz Grey

Wood-effect finish

Powder-coated finishes are specified by RAL reference. Availability, texture and any dual-colour option are confirmed with your quotation.

DELIVERY ACROSS ENGLAND & WALES

Free within 70 miles of Gloucester.

Free delivery applies to orders of £600 or more within 70 miles of Gloucester. For projects more than 70 miles away, a minimum order of £1,500 applies. We confirm delivery arrangements with every quotation.

View delivery details