How Much Do Bay Window Cost in 2026?
Replacing a bay window with a fitted white uPVC double-glazed bay typically costs £1,000–£2,950, depending on its 3–5 sections and size; aluminium and timber cost more.
Large Edwardian-styled houses in the mid-20th century popularly featured bay windows. Victorians, known for their love of highly decorated architecture, preferred these windows as they projected out from the exterior wall line and extended to the floor.
But how much do they cost to install?
This guide will give you the full answer to that, and more.
Want to know why bay windows are still popular today?
That’s because bay windows add square footage to your home and are also great for making the best use of natural light. They can be a great focal point in a living room or provide a panoramic viewpoint from a projecting bedroom window.
- Well-designed bay windows can increase the resale value of your house.
- Bay windows with properly installed energy-efficient glass can help regulate indoor temperatures and reduce costs for heating and cooling.
- The additional interior space created by bay windows is versatile. It can create a cosy reading nook, a seating area, or even a tiny dining area.
Though installation bay window costs might be more expensive, they make for great investments in the long run. They make for architecturally interesting structures that increase kerb appeal and home value and also help reduce your utility costs.
In this guide you’ll find:
Bay Window Installation Cost
How much you pay for a bay window depends on its size and number of sections.
Bay windows are versatile. Choosing the correct size of the window would depend on the function you want to focus on. The size of a single window can range from 488mm width x 488mm height, up to 1,770mm width x 1,500mm height.
You should also be able to identify the differences between types of bay windows like bow windows and oriel windows when deciding on what window to install.
Bow windows project from the room and ‘float’ without the wall underneath. They create a curved design that gives a softer aesthetic to the outside of your home. They do not require building permission compared to bay types.
Oriel windows protrude from the main wall of a building but do not reach the ground and are typically located above the first floor of a building. You should consult with an architect before installation since they require structural support.
| Price Range- Low | Price Range – High | Average Cost | |
|---|---|---|---|
| Bay Windows | |||
| 3-sections | £1,000 | £1,400 | £1,250 |
| 4-sections | £1,500 | £1,800 | £1,650 |
| 5-sections | £1,900 | £2,400 | £2,000 |
| Bow Windows | |||
| 3-sections | £1,100 | £1,400 | £1,250 |
| 4-sections | £1,500 | £1,800 | £1,650 |
| 5-sections | £1,900 | £2,300 | £2,100 |
| Oriel Windows | |||
| 3-sections | £1,500 | £1,800 | £1,650 |
| 4-sections | £1,900 | £2,500 | £2,200 |
| 5-sections | £2,600 | £4,000 | £3,300 |
* Prices indicated are ballpark estimates for white uPVC windows. It would be best if you compared these prices with Ecopreneurist to stay current with market trends.
Compare Bay Window Prices
Get quotes from local installers
1 fast form = 4 low quotes
Save up to £703 per year
Best Window Frame for Energy-Efficiency
The type of material you pick plays a crucial role in determining the overall cost of your windows.
uPVC windows are the most budget-friendly among the popular options. Many prefer them for their durability and low maintenance, making them a top choice.
Aluminium is also durable, especially suited for modern homes. Though the priciest, Timber is still popular due to its charming appearance.
Energy-efficient windows frequently incorporate multiple layers of glass to reduce heat transfer. Adding more layers to your windows improves insulation, ensuring a steady indoor room temperature and enhanced air quality.
For those in colder areas, triple glazing might be preferable to the standard double glazing. With an extra panel, triple glazing boosts thermal efficiency and home security. The average U-value for triple glazing is 0.9W/(m²K), significantly lower than the 1.4W/(m²K) of double-glazed windows. If triple glazing suits your needs, expect costs ranging from £2,000 to £4,535.
| Frame Style | Price for 4-sectioned windows with double-glazing | Price for 4-sectioned windows with triple-glazing |
|---|---|---|
| uPVC | £1,500 – £2,160 | £2,000 – £3,025 |
| Aluminum | £1,860 – £2,810 | £2,605 – £3,935 |
| Wood | £2,145 – £3,280 | £3,000 – £4,535 |
These prices are averages and you should compare these with Ecopreneurist to know the most updated price estimates.
The average cost of a 4-panel bow window in uPVC is £1,650. Opting for aluminium or timber windows will likely raise the cost to approximately 30% for aluminium and 50% for timber.
Planning Permission for Bay Windows
If you’re replacing existing bay windows, planning permission is not required.
However, if you plan to transform standard flat windows into bay windows, it might be considered a home extension. In such cases, it’s essential to check with your local council to determine if you need permission for the window installation.
Take note
British building regulations apply to all replacement glazing. This means that any window installation must adhere to specific standards concerning thermal performance, safety, ventilation, and means of escape.
It all boils down to this.
Before you install bay windows in your home, ask yourself these four questions:
- Have I checked with my local council to see whether I need planning permission? Don’t forget to check building regulations in your area if you’re installing bay windows for the first time.
If you did not secure the necessary planning permission for window replacement, authorities might impose a fine as they would consider this a violation of planning regulations. - What is the best type of bay window for my home’s design style ? Avoid being influenced solely by current trends when choosing windows. Instead, prioritize selections that harmonize with the overall appearance of the house to create a cohesive aesthetic.
- Have I scouted around for fair and competitive prices for bay window costs? You can compare current market prices with Ecopreneurist to determine the cost-effectiveness of your chosen window material and type before you make a final decision.
- Am I hiring the right person to install my windows? If you’re not installing the windows yourself, make sure to hire tradespeople with relevant experience and request to view samples of their recent work before you commit to their service.
To sum up, the cost of bay windows will vary based on factors like material, size, style, and glazing options. Their average cost ranges from £1,000 to £4,535. When planning your bay window project, it’s crucial to consider these elements, including installation and maintenance costs.
With the right style, material, and professional installation, investing in bay windows for your home will not only enhance the general attractiveness of your home but also offer long-lasting savings with their energy efficiency.
How do I choose the right size for my bay window?
Consider the available space, the purpose of the window, and your design preferences. It’s often beneficial to consult with a professional to ensure proper sizing and installation.
Do bay windows require special maintenance?
Maintenance requirements depend on the material. uPVC windows are low-maintenance, while timber windows may need more attention. Regular cleaning and inspections are recommended.
Can bay windows be installed in any room?
Installers can place bay windows in various rooms as they offer versatility. Living rooms, bedrooms, and dining areas often feature them, but their suitability depends on the architecture of the space.
Can bay windows be installed on any floor of a building?
Bay windows are commonly installed on the main floor or upper floors of a building. The feasibility of installation depends on structural considerations and the design of the building.
Are bay windows suitable for all climates?
Yes, bay windows are suitable for various climates. However, factors like insulation and the choice of glazing can affect their performance in extreme temperatures. Triple glazing is often recommended for colder climates.
Written By
Reviewed By
