Bay & Bow WindowsExpansive, Secure & A-Rated Efficient
Our Bay and Bow Windows create more space, light and panoramic views. Available as 3-section Bay, 5-section Bow, and bespoke angled designs in uPVC, aluminium & timber. Britain’s favourite feature window with A-rated thermal efficiency and PAS 24 security.
Bay & Bow Windows Explained
A Bay and Bow Windowis a projecting window that extends outward from your home to create extra space, light and panoramic views. A Bay Window typically uses 3 sections angled at 90°, 135° or 150°, while a Bow Window uses 4 or 5 sections to create a softer, curved projection.
Unlike a standard flat casement window that sits flush with your wall, a Bay & Bow projects beyond the building line supported by a cill, bay pole and insulated base. This design not only adds usable floor space and a deep window seat, but also captures light from three directions and adds architectural character inside and out.
At Win-Doors INT LTD we offer Bay & Bow Windows in uPVC & aluminium engineered, with configurations including 3-section Bay, 5-section Bow, Box Bay, and fixed + casement combos for ventilation. All are A-rated for energy efficiency, PAS 24 secure and made-to-measure in London.
SignatureFeatures
Expand your view with Bay & Bow Windows from Win-Doors INT LTD. Projecting outward to create extra space, panoramic views and 3x more natural light, our Bay & Bow Windows are custom-built in London in uPVC, and aluminium engineered. Choose from 3-section Bay, 5-section Bow and Box Bay styles all A-rated, PAS 24 secure and made-to-measure for your home.
Thermal Break Frame
45mm aluminium + 22mm polyamide barrier stops heat transfer
Multi-Point Locking
3-5 concealed points, Secured by Design certified
Concealed Crank Handle
Smooth stainless crank, 90° outward swing, one-hand
Low-E Double Glazing
24mm double / 36mm triple, Argon filled, warm-edge
100% Full Ventilation
Full sash opening vs 50% slider, maximum cross-breeze
EPDM Triple Seal
Triple compression gaskets, airtight & water-tight
Acoustic Insulation
Up to 38dB reduction, laminated acoustic glass option
Powder-Coat Finish
25yr warranty, teal & gold custom, UV & low maintenance
Three Materials.
One Panoramic View.
Built for the British climate. From cosy uPVC to slimline aluminium, every Bay & Bow is Secured by Design, A-rated and made to measure.
CLIENT FAVOURITEProfile 22 Bay & Bow (uPVC)
- A-Rated Energy Efficiency
- PAS 24 Secured by Design
- Virtually Maintenance-Free
- 20+ Colours & Dual Colour
- 10-Year Guarantee
- Best Value Bay Solution
SLIMLINE PANORAMICAluminium Bay & Bow
- 54mm Ultra-Slim Sightlines
- Thermally Broken - A Rated
- 45+ Year Lifespan
- Any RAL Colour - Powder Coated
- 100% Recyclable & Sustainable
- Architectural-Grade Strength
Built For Performance, Style & Security Over 20 Years of Expertise, Built Into Every Bay
We don't just install windows we manufacture them. Premium systems designed for the UK climate, installed with precision, and protected by a 10-year guarantee.
Made to Measure in the UK
Every window manufactured to your exact size, not off-the-shelf. Perfect fit, zero compromise.
Profile 22 System
UK's most trusted 70mm system for thermal & weather performance. Engineered for British weather.
A+ Energy Efficient
Keep heat in, bills down, EPC ratings improved. Argon-filled double glazing as standard.
Secured By Design
Multi-point locking, internal glazing, police-approved security. Your peace of mind built-in.
10 Year Guarantee
Full guarantee on frames, hardware & installation. No quibble, no small print.
Made to Last, Zero Maintenance
Never rots, warps or needs painting. A quick wipe keeps them pristine for decades.
Ideal For Bay & Bow Properties
From heritage villas to modern offices, bay & bow windows adapt beautifully to any architecture. Their panoramic projection, full light capture, and thermal precision make them the architect's choice for spaces that demand light, space, and statement.
01 • ApplicationResidential Homes & Villas
Elevate façades with clean lines and expansive glass. Perfect for modern villas where indoor-outdoor flow matters.
- Floor-to-ceiling ventilation
- Heritage + modern compatibility
02 • ApplicationKitchens & Living Areas
Invite light and cross-breeze where family gathers. Easy crank operation even over counters and sinks.
- One-hand crank operation
- Unblocked view while cooking
03 • ApplicationCommercial & Office Spaces
High-performance thermal break aluminum meets corporate aesthetics and all-day comfort.
- Acoustic insulation up to 38dB
- Low-E for energy compliance
04 • ApplicationBedrooms & Bathrooms
Privacy, ventilation and condensation control. Ideal for intimate spaces needing fresh air without compromise.
- Trickle vents for night cooling
- Frosted & tempered glazing options
05 • ApplicationHotels & Apartments
Durable, secure, and uniform across floors. Multi-point locking meets hospitality-grade maintenance.
- 90° egress for cleaning access
- Consistent sightlines across façade
Crafted for Every Bay & Bow Space
Maximum Ventilation
100% sash opening, 90° outward swing for cross-air flow.
Energy Efficiency
Compression seal + thermal break, U-factor ≤0.28
Unobstructed Views
Slim sightlines, no mid-rail, more daylight
Enhanced Security
Multi-point locking, concealed hinges
Configure Your Bay & Bow
Bespoke by Design Customise colours, handles, glazing, grids and sizes to suit your bay & bow project.
Inspired by nature
Woodec
Woodec illustrates the appearance of real wood with a unique character combined with all the advantages of our excellent product range. This is what the new Woodec decorative foils offer. Not only is it difficult to distinguish visually from the natural material, but the Woodec foil also recreates wood very realistically to the touch, thanks in part to deep embossing and a matte top layer.
Inspired by style
Aludec
The attractive surface of Aludec decorative foils, distinguished by a unique fine-grained, matt surface with a similar finish to powder-coated aluminium, is a fabulous option that suits contemporary modern minimalist designs.
The new Aludec foils follow this trend, offered in seven attractive shades ranging from whites and greys, brown, jet black, anthracite, and a metallic finish.
Feature colours
Standard foil colours
All aluplast coloured foil finishes feature innovative technology which improves performance characteristics, providing a much longer life cycle of the surface finish.
Custom foil colours
Our Completed Projects
Bay & Bow Windows – Frequently Asked Questions
Everything homeowners want to know about our uPVC, aluminium and heritage bay & bow windows.
What is a Bay & Bow Window?
A bay & bow window is a projection window that extends outward from your home’s main wall, creating more space, more light, and a wider view.
Unlike a flat window, it is built from 3 or more panels angled together to form a bay, or 4-6 panels in a gentle curve to form a bow.
The Difference:
- Bay Window:
- Structure: Made of 3 panels
- Shape: Angular 1 large central picture window with 2 smaller windows angled at 30° or 45°
- Look: More defined, architectural and modern. Creates a deep, usable sill that can be used as a window seat or storage.
- View: Wide, 3-directional view.
- Bow Window:
- Structure: Made of 4 to 6 panels
- Shape: Curved panels joined in a gentle, continuous curve to form a soft arc
- Look: More elegant, graceful and traditional. Creates a beautiful curved panoramic effect inside and out.
- View: True panoramic view up to 180°.
What is the difference between a bay window and a bow window?
Bay Window:
- Structure: Made of 3 panels
- Shape: Angular — 1 large central picture window with 2 smaller windows angled at 30° or 45°
- Look: More defined, architectural and modern. Creates a deep, usable sill that can be used as a window seat or storage.
- View: Wide, 3-directional view.
Bow Window:
- Structure: Made of 4 to 6 panels
- Shape: Curved panels joined in a gentle, continuous curve to form a soft arc
- Look: More elegant, graceful and traditional. Creates a beautiful curved panoramic effect inside and out.
- View: True panoramic view up to 180°.
Are bay & bow windows energy efficient?
Yes, when engineered correctly, bay & bow windows are highly energy efficient and can significantly reduce heat loss.
At Windoors, our bay & bow windows are built for UK energy standards
- Multi-Chambered Profiles: Our uPVC and aluminium profiles trap air inside the frame itself, preventing heat from escaping.
- High-Performance Glazing: Available with A-rated double or triple glazing, low-E glass and warm-edge spacer bars to retain heat in winter and keep your home cool in summer.
- Precision Sealing: Because bay & bow windows have multiple angled joints, sealing is critical. Our factory-engineered corner posts and structural bays are fully insulated and weather-sealed to eliminate drafts and cold spots.
- Thermally Broken Aluminium: Our aluminium bay & bow options include a polyamide thermal break that stops heat transfer through the metal.
Elevate Your Home with Windows & Doors
Get a free, no-obligation quote for casement windows in London. Made-to-measure, FENSA installed, A-rated & PAS 24 secure. Side-hung, French & bay options in uPVC, aluminium.