What’s the difference between a bay and a bow window?

A bay window projects with three sections (typically angled), while a bow uses four or more equal segments for a gentler curve.

Do bay and bow windows need structural support?

Often yes. We assess at survey and can install appropriate supports, bay poles or steels and match cills/roofs.

Which materials are available?

uPVC and aluminium with matching trims, cills and insulated roof options.

Are they energy-efficient?

Yes—double or triple glazing, warm-edge spacers and low-E coatings to achieve low U-values.

Are trickle vents and safety glass available?

Yes—background ventilation can be added, and toughened/laminated glass is specified where required.

Can you convert a flat window into a bay/bow?

Yes—subject to structural checks and permissions. We handle calculations and building regs compliance.

What styles can the openers be?

Mix of fixed panes and opening casements/flush casements; Georgian or astragal bars available.

What guarantees do you provide?

10-year insurance-backed installation guarantee plus manufacturer warranties; FENSA registration supplied.

Which areas do you cover and how do I get a quote?

We cover Hampshire, West/East Sussex, Surrey, Berkshire, Greater London and parts of Kent. Call 0800 368 9166, WhatsApp 07932 960284 or use our quote form.

Bay & Bow Window Services in Southeast England

Q: How long does installation take?

Typically 1–2 days for a replacement; conversions may take longer depending on structure and finish.

Aluminium and uPVC Bay & Bow Windows for homes & businesses across Southeast England

Bay & Bow: elegant window upgrades

Transform the way your property looks and feels from the inside and out.

Bay windows are an elegant choice that introduces a unique sense of openness and space to any home or commercial building. Brighten up your home or office in Southeast England with a new set of aluminium or uPVC bay windows and extend your view of the great outdoors.

Bay windows are a classic Victorian feature suited to traditional and modern interiors. Whether upgrading your shopfront or renovating your lounge at home, bay windows offer a high-performing, stylish and character-filled solution.

Typically, bay windows feature a central fixed window with two smaller casements or double-hung windows on either side, projecting outward from the wall for a clean, structured appearance both inside and out. Not only do our bay windows provide exceptional energy efficiency, but they’re also built to make an excellent first and lasting impression.

Bow windows on the other hand, have a softer, more rounded shape, offering a modern, more seamless panoramic view suited to contemporary homes and offices. Typically composed of four or more sections arranged to form an arch, bow windows provide a more graceful curvature and uninterrupted views.

Whether upgrading your office for a sleek, sophisticated feel or adding a touch of elegance to your home, Instant Windows and Doors are among the best installers of bay and bow windows across Southeast England.

All our bay and bow window installers in Southeast England are FENSA-registered.

We pride ourselves on delivering a fast and efficient bay and bow window installation service and are always available to carry out bay and bow window repairs to the highest industry standards.

Transform the way your property looks and feels from the inside and out.

Key features of aluminium and uPVC bay and bow windows:

Bay: classic Victorian feature with structured appearance
Bow: curved, seamless appearance for modern designs
Enhance the feeling of space and openness
Create a panoramic view of the outside world
Replicate your original timber bay windows
Smooth operation and functionality
A-rated energy-efficiency as standard
Low maintenance with no need for sanding or varnishing
High potential to increase property value

Benefits of bay & bow windows we install across Southeast England:

Our certified uPVC and aluminium bay and bow window installation and repair service is available across Southeast England. Benefits of bay and bow windows include:

Energy-Efficient
Enhanced Security
Enhanced View
Increased Interior Space

Effortless Operation
Minimal Maintenance
Increased Property Value
Noise Reduction

Weather Resistant
Improved Ventilation
Customisable Options
Eco-Friendly

Why choose us to install your aluminium or uPVC bay and bow windows:

Industry-Standard Compliant

Reliable & Certified Bay & Bow Window Installers

At Instant Windows & Doors, our bay and bow window installers are FENSA-registered; FENSA stands for Fenestration Self-Assessment and is a government-authorised scheme that monitors building regulation compliance for replacement windows and doors.

In friendly terms, a FENSA certificate assures you that the bay or bow window installer who fitted your bay or bow windows has complied with Building Regulations and registered the installation with the Local Council; both are legal requirements!

If you ever decide to sell your home or business premises, proof of them is essential.

High-Performance Security

PAS 24 British Standard Bay & Bow Windows

Double-glazed bay and bow windows add an extra layer of security to your home or workplace; they are installed with an internal layer of glass that cannot be removed from the outside and top-notch PAS 24 British-standard multi-point locking systems that effectively deter opportunists from breaking in.

Bay and bow windows offer peace of mind for home and business owners across Southeast England. Sleep at night knowing your loved ones and business assets are safe!

Why choose us to install your aluminium or uPVC bay and bow windows

Upgrade your Bay or Bow Windows to PAS 24 British Security Standard

PAS 24 is a UK security standard that assesses the performance of windows and doors against entry and intrusion. PAS 24 certifies that a product has been tested and meets specific security requirements. Upgrade your existing uPVC or aluminium bay or bow windows with a simple laminate glass system.

Insurance-Backed Guarantee

Backed by Home Improvement Protection Scheme

Invest with confidence. At Instant Windows & Doors, we use the best energy-rated systems available on the market and include a 10-year insurance-backed guarantee with every aluminium or uPVC bay or bow window installation.

It is also worth mentioning that our bay and bow windows are backed by the Home Improvement Protection scheme - for your safety and investment security.

5 good reasons to choose bay & bow windows for a home or business in Southeast England:

Space, Light & Ventilation

Both bay and bow windows extend outward, creating a sense of openness and allowing natural light to flow freely into your home or workplace. Perfect for residential and commercial properties, these windows add character while maximising light and space. With multiple panes forming your bay or bow windows in Southeast England, you can enjoy superior ventilation without compromising your safety.

Enhanced Panoramic Views

One of the most exciting benefits of bay and bow windows is the new view they create. While some overlook a garden, a bustling cityscape or a serene countryside, these windows expand the view, connecting your interior space to the great outdoors. While bay windows offer a traditional structured appearance, bow windows have a gently curved design, offering a wider and more seamless view.

Both bay and bow windows are equally impressive; your choice will ultimately depend on the style and look you are going for.

Elegant, Timeless Aesthetic

While the British bay and bow windows have been favoured for centuries, particularly in Victorian architecture, they are now increasingly popular in modern homes and commercial buildings. Whether you prefer the straight-edged or curved appearance, our bay and bow windows are guaranteed to enhance energy efficiency, security and comfort, all while increasing your curb appeal and giving your property the 'WOW' factor. Available in wide-ranging colours, finishes and glazing choices, our bay and bow windows in Southeast England are made to integrate seamlessly with your existing design.

Energy-efficient window choice

Save money on monthly energy bills and create an energy-efficient environment with new bay or bow windows installed across Southeast England. These windows are designed to enhance insulation, reducing heat loss and helping to maintain a comfortable temperature year-round. Whether upgrading your home or business, these windows offer an eco-friendly solution that combines style and performance.

5 good reasons to choose sliding sash windows for a home or business in Southeast England

Weather, sound and impact resistant

Bay and bow windows can be installed with highly durable safety glass, robust frames and multi-point locking mechanisms, making them a super-safe window choice for home and business owners across Southeast England. Bay and bow windows are highly secure and allow you to rest knowing that your loved ones or business assets are safe in your absence. Bay and bow windows are highly durable and resistant to the harshest weather conditions.

You no longer need to worry about fading, cracking or damage from the rain, wind or sun. With double or triple-glazing options, they also offer excellent soundproofing, cutting down on external noise and creating a much quieter indoor environment.

Bay & Bow Windows FAQs:
Space, Light, Energy Efficiency & Installation in South East England

What is the difference between bay and bow windows?

Bay windows typically have three sections (a large central pane with two angled sides), projecting outward to create extra space inside. Bow windows feature four or more sections forming a smooth curve. Both styles enhance natural light, views and interior space, adding kerb appeal and value to your property.

Why choose bay or bow windows for my home?

Bay and bow windows create the impression of a larger, brighter room while adding architectural character. They can provide extra seating, storage or display space inside your home and dramatically improve both the interior and exterior look of your property.

Are bay and bow windows energy-efficient?

Yes — our bay and bow windows are built with A-rated double or triple glazing, thermal spacer bars and advanced seals to prevent draughts. They are designed to achieve excellent U-values, helping to reduce heat loss and comply with the latest Building Regulations.

Do bay and bow windows require special maintenance?

No — our modern uPVC and aluminium bay and bow windows are low-maintenance. Unlike older timber versions, they won’t rot or warp, and only need occasional cleaning. The frames are powder-coated or foiled for long-lasting colour and finish durability.

Are bay and bow windows secure?

Yes — security is built in. Our windows come with multi-point locking, reinforced frames and toughened or laminated glazing options. Many models meet PAS 24 standards and can be specified with Secured by Design accreditation for maximum protection.

Can I customise bay and bow windows?

Absolutely. Choose from uPVC or aluminium frames, a wide palette of colours and foiled finishes, decorative or plain glazing, Georgian bars, cills, and hardware styles. You can also select dual-colour frames to match inside décor and exterior design.

Do bay or bow windows need planning permission?

In most cases, replacing an existing bay or bow window does not require planning permission. However, if you’re adding a new bay or altering the structure of your property, consent may be needed. Homes in listed buildings or conservation areas may also require approval. We’ll advise during your survey.

How much do bay and bow windows cost?

Costs depend on size, configuration, material, glazing and finish. Bay windows are typically slightly more affordable than bow windows due to fewer panels. We provide a free, no-obligation quote with clear breakdowns and finance options (subject to status).

How long does installation take?

Installation time varies depending on size and structural requirements. For most properties, bay or bow window installations take around 2–4 days. If structural supports are needed (such as lintels or steelwork), installation may take slightly longer. We’ll confirm timescales during your quotation.

What guarantees come with bay and bow windows?

All installations include a 10-year insurance-backed guarantee, plus manufacturer warranties on profiles, sealed glass units and hardware. We also register every installation with FENSA to provide a compliance certificate for peace of mind and resale value.

Which areas do you cover for bay and bow window installation?

We install bay and bow windows throughout Hampshire, West Sussex, East Sussex, Surrey, Berkshire and parts of Kent & Greater London. See our Areas We Cover page or Request a Quote to confirm service in your location.

How do I request a free bay or bow window quote?

Call 0800 368 9166, message us on WhatsApp 07932 960284, email sales@instantwindowsanddoors.co.uk or fill out the Request a Quote form. We’ll arrange a free survey and provide tailored advice.

Call us to discuss
your project.

Contact Martin & his team for a free bay or bow window installation quotation.

At Instant Windows & Doors, we guarantee a reliable and trustworthy bay or bow window installation and repair service anywhere across Southeast England.

Book one of our local and certified bay or bow window installers in your area and receive a rapid response service with no call-out charge and a super-fast turnaround.

We always make time for our clients and promise to deliver an expert bay or bow window installation and repair service according to your needs.

Receive expert guidance based on your requirements and make informed decisions to ensure you get the most out of our bay or bow window services in Southeast England.

Enquire about this service

At Instant Windows, your
feedback is noted
and appreciated.

Our skilled, insured, licensed, and certified
installation professionals offer seamless
window and door installations for both
residential and commercial properties.

READ OUR CUSTOMER REVIEWS

Contact us to discuss your project

Competitively priced windows and doors in Southeast England.

At Instant Windows & Doors, we assure you of a dependable and trustworthy window and door installation and repair service available throughout Southeast England. Schedule one of our local, certified installers in your vicinity, and enjoy a prompt response without any call-out fees and swift service turnaround.

We are dedicated to prioritising our clients and ensuring the provision of expert window and door installation and repair services tailored to your specific requirements.

We are proud to work with the following companies

Instant Windows and Doors covers the following areas

Check out the areas we work in ➔ ✅ Hampshire ✅ West Sussex ✅ East Sussex ✅ Sutton ✅ Bromley ✅ Croydon ✅ Berkshire ✅ Surrey ✅ Parts of Kent ✅ Parts of Greater London