Window Replacement & Window Installation Service

Welcome to Fittra – your ultimate destination for window installation and replacement in London!


For nearly a decade, we’ve been transforming London homes, combining superior service with dedication beyond customer satisfaction.


Our expert services are available throughout London, spanning North, East, South, West, and Central districts.


Selecting Fittra means teaming up with an esteemed NHBC-registered company, offering London’s most competitive window prices, further facilitated by our convenient 10% deposit finance option.

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Why Choose Fittra?

With a firm footing in the construction industry, our strong ties with leading window manufacturers across the UK and Europe let us offer exclusive benefits to our valued clients in London.


At Fittra, we understand that variety is the spice of life. That’s why we bring you an expansive selection of styles, designs, profiles, colours, and sizes, ensuring every unique taste finds its match.


Why choose Fittra? Here’s why:


  • Great Value: We pass our trade discounts onto you, ensuring a perfect balance of price and quality to match your budget.
  • Fast Lead Times: With timelines of 3-4 weeks, we get your project done way faster than the average 8-12 weeks industry standard.
  • Complimentary Consultation: We believe in guiding our customers every step of the way.
  • One-Year Limited Warranty: We stand by the quality of our work.
  • 24/7 Availability: We’re here for you anytime you need us.
  • Insurance and Low Deposit: Benefit from our public/products/employer’s liability insurance and get started with a low 10% deposit.
  • Credibility: Our NHBC registration and accreditations with NFB, FMB, TrustMark, and Considerate Constructors showcase our commitment to excellence.


Ready to experience the Fittra difference and see why we’re among London’s top window replacement companies? Contact us today

Window Replacement and Installation Services

We’re not just your standard construction company – we offer various services tailored to your needs.

Windows Installation

Window Installation

As one of the most reliable replacement windows companies, Fittra ensures top-notch installation that fits perfectly into your London home.

Windows Replacement

Window Replacement

Recognised among London’s best window replacement companies, Fittra’s swift and precise services refresh your property without any fuss.

Technology and Materials

Technology and Materials

Fittra, one of London’s top window fitting companies, merges advanced technology and premium materials to deliver the best results.



Fittra’s uPVC windows, a popular choice for home window installation in London, combine efficiency, safety, and durability. Our options are numerous, and prices are competitive, making us a preferred company in London for cheap window replacement.



Our robust and recyclable aluminium windows transform homes with their contemporary appearance. Choose Fittra for your next window replacement in London.

Standard skylights

Standard skylights

Bring in lighter, warm, and energy efficient with Fittra’s standard skylights. Enjoy enhanced views and a fresh ventilation option in your London home, making us your best window replacement London company.

Window Replacement Cost in UK

At Fittra, we believe in making your home transformation both straightforward and affordable.


We offer expert window services at a competitive price of just £100 per window installation (excluding window price). This fee is for one window installed, ensuring clarity with no hidden extras.


As a trusted window replacement company in London, we strive to make quality home improvements accessible to all. That’s why we offer a flexible financing option, requiring a 10% deposit to start your project.

Interested in window replacement?


Why Work With US

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at all stages

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with project manager

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liability insurance

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of works

Integrated, In-house Team Will Work On Your Project

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Benefits from our trade discounts
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£5M public & products liability
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10% only deposit payments
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Detailed cost breakdown

In the End You Will Get




Our Projects

Do you have questions?

Frequently Asked Questions

What is the average cost for window installation in London?

At Fittra, we believe in fair and competitive pricing. Our standard cost for window installation in London is a mere £100 per window (excluding the cost of the window itself). We understand that every penny counts, which is why we’re committed to offering rates that respect your budget. 


This rate applies to our comprehensive installation service, and the professionalism and dedication of our team ensure that you get excellent value for your money.

What factors influence the cost of window replacement in London?

The cost of window replacement can vary due to several factors, such as the type and size of the window and the intricacy of installation requirements. As one of London’s top replacement window companies, Fittra maintains transparency in our pricing. 


We discuss the project with our clients, breaking down costs to ensure they understand exactly where their money is going. This open approach is part of our dedication to client satisfaction and service excellence.

In London, uPVC and Aluminium windows are extremely popular due to their durability, aesthetic appeal, and functionality. Fittra offers an extensive range of these window types, catering to different tastes and needs for window replacement in London. 


Whether you’re looking for the sleek modernity of Aluminium or the classic charm of uPVC, we have an option that’s perfect for you. Our window selection is designed to complement London’s diverse architectural styles, enhancing the beauty and value of your home.

How long does a typical window installation or replacement process take in London?

Fittra sets the standard for efficiency in window installation and replacement. We understand that time is precious, so our window company in London operates on a streamlined timeline of 3-4 weeks for installations or replacements. This is significantly quicker than the industry standard of 8-12 weeks. 


Our team works carefully to ensure that your window project is completed swiftly without compromising on quality, transforming your home with minimal disruption to your routine.

Are there any specific regulations or permissions needed for window replacement in London?

In some cases, permissions may be required for window replacements in London, especially for properties in certain locations or of a specific nature (like listed buildings). At Fittra, we’re not just experts in window replacement in London; we’re also well-versed in the regulatory landscape. 


We offer guidance and assistance in navigating any necessary procedures, ensuring that your window replacement project adheres to all relevant regulations. This comprehensive support is part of our commitment to delivering a hassle-free client experience.

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Work time

Mon-Fr: 8.00 am – 5.00 pm
Sat: 8.00 am – 1.30 pm




Park Parade Gunnersbury Avenue, W3 9BD



02082 438568

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