Window replacement isn’t always for aesthetic reasons. It can also be a smart, long-term investment for commercial properties looking to improve their energy performance, reduce ongoing maintenance costs, and, most importantly, stay compliant with building regulations.
Whether you’re managing an office building, shopfront, or multi-use building, ageing or inefficient windows can quickly start to negatively impact your operating costs and tenant satisfaction.
But how much does it actually cost to replace your property’s windows in London? The answer depends on a number of factors, from material and glazing to building access restrictions.
In this blog, we’ll go through the average prices for window replacement in London, what influences these prices, and what you can expect when you upgrade your windows with a trusted commercial contractor like All Clean London.
What Does Window Replacement Involve?
Commercial window replacement in London typically tends to involve a complete upgrade. Removing old or failing windows and replacing them with new ones designed for durability, insulation, and building compliance.
Window replacement doesn’t just involve replacing the glass, it also includes replacing window frames, seals, and fittings. Helping your property meet modern building standards.
For most commercial properties, it’s also a chance to improve energy efficiency, reduce long-term costs, and enhance your brand’s curb appeal.
Depending on your building’s age or location, structural adjustments or planning permissions may be required, especially in conservation areas. We recommend you consult with a specialist who will understand the unique requirements of your London property.
Average Commercial Window Replacement Costs in London
Whether you’re managing a shopfront or an office block, understanding the typical costs for commercial window replacement will help you budget more effectively for building maintenance. We’ve created this estimated pricing guide to give you an idea of what you can expect to pay:
Window Type | Estimated Cost (per unit) |
Standard uPVC commercial window | £500 – £900 |
Aluminium-framed double-glazed window | £800 – £1,500 |
Curtain wall or full-height glass panel | £1,500 – £3,500+ |
Full frontage upgrade (10+ windows) | £7,000 – £20,000+ |
Secondary glazing (for listed buildings) | £400 – £700 |
These costs are rough estimates. For a more accurate price, we recommend you contact us for a tailored quote based on your property’s specific requirements.
Whether you’re managing a shopfront or an office block, understanding the typical costs for commercial window replacement will help you budget more effectively for building maintenance. We’ve created this estimated pricing guide to give you an idea of what you can expect to pay:
Window Type | Estimated Cost (per unit) | Notes |
Standard uPVC commercial window | £500 – £900 | Cost-effective for smaller properties that require minimal customisation |
Aluminium-framed double-glazed window | £800 – £1,500 | Common in office buildings and modern retail units |
Curtain wall or full-height glass panel | £1,500 – £3,500+ | Suitable for large frontages or corporate buildings |
Full frontage upgrade (10+ windows) | £7,000 – £20,000+ | Depends on the window type, access, and installation requirements |
Secondary glazing (for listed buildings) | £400 – £700 | Preserves original windows while improving energy performance |
These costs are rough estimates. For a more accurate price, we recommend you contact us for a tailored quote based on your property’s specific requirements.
What Affects the Cost of Window Replacement?
1. Size and Quantity of Windows
The more windows you’re replacing, the higher the cost will typically be. However, on larger projects, you may be able to benefit from bulk buying discounts.
Oversized units, like full shopfront glazing or wide-span panes, will often require specialist installation, additional lifting equipment, or made-to-measure glass. All factors that will increase the overall cost.
2. Type of Glazing and Frame Material
Your choice of window frame material will also significantly impact the overall cost and performance.Â
uPVC will typically be the most cost-effective option, but it may not suit premium or listed properties. Aluminium is a popular choice for commercial buildings, due to its strength, low maintenance, and contemporary appearance.Â
Glazing choices, like triple-glazing or acoustic glass, will also influence price, particularly in areas where energy efficiency or noise reduction is a top priority.
3. Building Height and Access Requirements
Properties with windows on upper floors or with limited access will require either scaffolding, MEWPs (mobile elevated work platforms), or a rope access team.Â
These requirements are common in a big city like London, where public access, shopfronts, or transport zones limit working hours and movement.
Ground-level installations are much easier, faster, and less costly in comparison.
4. Planning and Compliance
In conservation areas, or areas with listed buildings, there are quite often stricter regulations on the materials you can use, the design of the windows, and the installation method.
You may be required to match the original features of the building or apply for planning permission. This can slow down timelines and raise costs.
Additionally, in these areas, all commercial windows will have to meet Part L energy efficiency standards and may even need to comply with fire escape or ventilation rules, depending on the building’s use.
5. Business Disruption and Phasing
In busy commercial environments, like retail, hospitality, or co-working spaces, minimising disruption is often one of the highest priorities. Projects may need to be phased over multiple visits or completed out of hours to avoid affecting regular business operations.Â
These added logistics can increase labour time and make scheduling more complex, particularly in tenanted buildings or high-traffic zones.
Types of Window Replacement Services for Businesses
Choosing the right window for your replacement will be dependent on your property’s purpose, layout, and regulatory requirements. Here are some of the most common window types for commercial properties in London:
- Commercial window replacement: Full replacement of frames and windows for offices, industrial units, and mixed-use buildings.
- Shopfront glazing replacement: Fully custom glass installations for retail stores and high-street premises. Designed for visibility, security, and branding.
- Curtain wall systems: Floor-to-ceiling glass panels. Commonly used in modern offices and corporate buildings.
- Secondary glazing for listed properties: An effective solution to help improve insulation and noise control in your building, without altering original windows. Ideal for heritage buildings or conservation areas.
- Reactive and planned maintenance: Fast turnaround for damaged windows or scheduled upgrades. Will be a part of a building’s long-term property management.
Each option supports commercial compliance, energy efficiency, and operational continuity.
When Should You Consider Window Replacement?
Not sure if it’s time to replace your windows? Here are some of the common signs you should look out for:
- Condensation or fogging between window panes is often a sign of failed seals.
- Rot or visible damage around the frames.
- Rising energy bills, even with updated insulation.
- Outdated glazing that doesn’t meet current safety or energy regulations.
- Tenant complaints about temperature, noise, or comfort.
- Low EPC ratings affecting lettable or compliance.
If you’re experiencing one or more of these issues, a professional window assessment will help you decide whether repair or full replacement is the most cost-effective solution.
Get a Commercial Window Replacement Quote in London
No two buildings are the same, especially in London’s commercial property landscape. That’s why the cost of window replacement will vary depending on your building’s size, access, glazing type, and planning requirements.
At All Clean London, we offer free, no-obligation site assessments to give you a clear, accurate quote tailored to your property. Whether you manage a high-rise office, a listed heritage building, or a retail unit with public access, we’ve got the experience to guide you through the process with minimal disruption.
We’ve been working across London for over 40 years, delivering reliable commercial window replacement services that meet both modern building standards and local planning regulations.
Need expert advice? Contact our team today for a commercial window replacement quote in London, and we’ll guide you through the next steps.
