A white-framed window set into a light-colored wall next to dark grey horizontal siding.

Transform Your Home with Premium uPVC Windows

Transform your home with premium uPVC windows from Bowalker. Our in-house surveyors and installers measure and fit every window with precision, delivering a weathertight, draught-free finish that improves thermal efficiency and comfort. As a FENSA-registered company (33081), every installation is fully compliant and backed by a 10-year insurance-backed guarantee for complete peace of mind.

Dimensions Max size 2.5M high x 1.5M wide
Thermally Broken As standard
Glass Astragal bars, Satin, Double Glazed

Professional uPVC Windows Installation and Replacement Services

As a trusted uPVC window installer founded in 2009, Bowalker provides premium uPVC window installation and replacement services for homeowners seeking modern glazing solutions that improve kerb appeal, thermal efficiency and everyday comfort. Our in-house window installers survey, measure and fit a wide range of bespoke uPVC windows, including Sliding, Casement, Tilt and Turn, Bay, Sash and Slimline styles, ensuring every window complements the property’s architectural character and performance requirements.

Whether you are replacing draughty, failed or ageing frames or upgrading to energy-efficient double-glazed units for the first time, our uPVC window replacement service is tailored to your property. We use A-rated glazing profiles, multi-chambered uPVC frames and warm-edge spacer bars to minimise heat loss and reduce energy bills, alongside secure multi-point locking systems and weather-resistant seals to improve home security and long-term durability.

Call Bowalker on 01444 810 111 to arrange your free consultation for premium uPVC window installation and replacement Services. From survey and measurement through to fitting and final inspection, every installation is completed to current Building Regulations standards, with FENSA-registered certification (33081) and a 10-year insurance-backed guarantee issued on completion.

Materials

Timber
uPVC

Standard Hardware

Chrome
Satin
Gold Knob
Antique Black Knob

Standard Colours

Smooth White
Cream
Painswick Grey
Anthracite Grey
Irish Oak
Dual Colour
Paint to Order

Glass

Triple Glazed
Satin
Astragal Bars

Standard Layouts

Single
Double
Triple

Our Certifications and Professional Standards

Why Homeowners Choose Bowalker For uPVC Windows and Installation Services

Homeowners choose Bowalker for uPVC window installation and replacement services because every stage, from the initial survey through to final inspection, is managed by our own in-house team, with no subcontractors involved. Founded in 2009, we have built a trusted reputation across Sussex, Surrey and London, supported by FENSA registration (33081) and a 10-year insurance-backed guarantee. We provide fixed-price, no-obligation quotes with transparent pricing so there are no unexpected costs at any point during your installation.

10-year Insurance-backed Guarantee

FENSA Registered And Fully Compliant

Hassle-free, Full-service Experience

In-house Installers (No Subcontractors)

Fixed Pricing Guarantee, No Surprises

Types of uPVC Windows We Install and Replace

At Bowalker, we install and replace uPVC Sliding Windows for modern homes, new builds and properties that require space-saving window designs. Featuring gliding sashes within precision-engineered uPVC frames.

These windows provide smooth operation, contemporary styling and increased natural light without requiring clearance for an outward-opening sash. Our in-house installers complete accurate fitting with A-rated double glazing, draught-proof seals and secure multi-point locking systems, meeting current Building Regulations for thermal performance and security.

Casement uPVC Windows feature side-hinged sashes that open outward from durable uPVC frames, providing excellent ventilation, clear outdoor views and practical everyday operation for both modern and traditional properties.

We install and replace Casement uPVC Windows tailored to complement your property's architectural style, with our in-house installers ensuring precise fitting, A-rated glazing, secure multi-point locking systems and weather-resistant frames. Casement windows are equally suited to period terraces, post-war semis and modern new builds.

We install and replace tilt and turn uPVC Windows, a dual-function style that tilts inward from the top for controlled ventilation or swings fully inward on a side hinge for maximum airflow and easy internal cleaning, with no ladders or external access required.

Our installers ensure accurate fitting with A-rated double glazing, secure multi-point locking systems and weather-resistant uPVC frames, meeting current Building Regulations. Particularly well suited to flats and upper-floor rooms.

Bay uPVC Windows project outward from the property wall to create additional interior space, wider outdoor views and increased natural light for modern and traditional homes alike.

We install and replace Bay uPVC Windows using durable uPVC frames, A-rated double glazing and secure multi-point locking systems, with each bay carefully surveyed and fitted to ensure structural alignment and a weathertight finish. A well-regarded upgrade in Victorian and Edwardian properties.

A Sash uPVC Window features vertically sliding panes within a durable uPVC frame, replicating the traditional counterbalanced operation of original timber sash windows whilst delivering thermal efficiency, security and low-maintenance performance.

Spiral-balance mechanisms allow each sash to slide smoothly without weights or cords. Our specialist installers fit Sash Windows with A-rated double glazing, secure locking systems and weather-resistant frames, making them the preferred choice for conservation areas, listed buildings and period homes.

At Bowalker, we install and replace Slimline uPVC Windows for modern homes and contemporary properties seeking minimalist designs with maximum glass area.

Slim-profile uPVC frames significantly reduce the visible frame width, increasing the glazed surface area to bring more natural daylight into the room and create cleaner sightlines. Our in-house installers ensure precise fitting with A-rated double glazing, weather-resistant seals and secure multi-point locking systems, meeting current Building Regulations throughout.

No more windows to show

See Our Work In Action

Doors

Pool House

We helped create a stunning new-build pool house in West Sussex, featuring bespoke cornerless sliding doors and uninterrupted countryside views.

Rooflight

Living Room Extension

Partnership with builder to create a bright, modern living space with aluminium French doors, Bifold doors, matching windows, and a Lantern Rooflight.

Doors

Whole House Renovation

Assisted a developer with a full property renovation with, installing bespoke blue and black aluminium windows and doors.

Windows

Full Window & Door Upgrade

We helped transform an aging building with 56 new white uPVC windows and doors, enhancing thermal efficiency while keeping costs reasonable.

What Are the Benefits of Installing uPVC Windows?

Installing uPVC windows provides improved thermal insulation, reduced outside noise, enhanced property appearance, reliable security, low-maintenance durability and increased property value. Modern uPVC windows use durable multi-chambered frames, energy-efficient glazing and secure locking systems to improve indoor comfort, minimise heat loss and complement both traditional and contemporary property styles.

Improves Thermal Efficiency

Multi-chambered uPVC frames and A-rated double or triple glazing reduce heat loss through windows by up to 70% compared with single-glazed units, helping lower energy bills and maintain consistent room temperatures year-round.

Reduces External Noise

Advanced acoustic glazing and tightly sealed uPVC frames can reduce external noise transmission by 35-40 decibels, making a measurable difference in rooms facing busy roads, flight paths or neighbouring properties, particularly in urban and suburban locations.

Enhances Property Appearance

Modern uPVC windows are available in a wide range of colours, woodgrain foils and architectural profiles, from slim-sightline contemporary frames to heritage sash designs, allowing the replacement to complement a Victorian terrace, a 1930s semi or a modern new build.

Supports Better Home Security

Bowalker installs uPVC windows fitted with multi-point locking systems, internally beaded glazing and PAS 24-compliant hardware as standard, meeting the security requirements recognised by insurers and Secured by Design accreditation, significantly raising resistance to forced entry compared with older frames.

Provides Low-Maintenance Durability

Unlike timber frames, which require regular sanding, repainting and resealing, uPVC frames resist rot, warping and corrosion. A simple wipe-down every three to four months maintains appearance and performance, with quality profiles carrying a service life of 20 to 35 years.

Increases Property Value

Energy-efficient windows can improve an EPC rating and increase a property's market appeal, with double glazing widely cited by estate agents as one of the most cost-effective improvements a homeowner can make before sale.

How to Get Started With uPVC Windows Installation and Replacement at Bowalker?

Getting started with uPVC window installation and replacement at Bowalker begins with arranging your free consultation and receiving a fixed-price, no-obligation quote from our experienced installation team. Our uPVC window installers assess your property and recommend suitable window styles, including Sliding Windows, Casement Windows, Tilt and Turn Windows, Bay Windows, Sash Windows, and Slimline Windows. Each uPVC window installation and replacement is tailored to complement your property while improving thermal efficiency, natural light, security and long-term durability.

Get In Touch

Fill out the form and we’ll get back to you shortly.

Areas We Serve

Bowalker provides professional uPVC window installation and replacement services across Sussex, Surrey and London, delivering high-quality uPVC windows with precision and care. Our skilled uPVC window installers deliver reliable workmanship, precise fitting and ongoing support for homeowners seeking durable, energy-efficient, low-maintenance uPVC window solutions throughout these regions.

What Our Happy Customers Say

EXCELLENT

Based on 36 reviews

Google Review

Write a Review

Marchants Estate Agents Hassocks 2 weeks ago

Excellent service from a local independent company. Highly recommend.

Andy Clarke 3 days ago

I had replacement windows installed. Design and advice was good and cost was competitive. Installation was started in a good time to a good standard.

Abi Hosier a month ago

Bowalker have been incredibly helpful and provided me with extremely useful information about the windows and doors at a property I moved into, previously supplied by them. Great customer service, really recommend

steph park a month ago

Bowalker replaced all of our windows and patio doors in November. They are very efficient and got the job done in the pouring rain but did it quick and professionally. We had a couple of teething issues with the doors after completion and they did not hesitate to come out and rectify the issue. Excellent customer service and a friendly team. Would highly recommend

Nic Downer Edited 3 months ago

We had a total of 6 windows fitted at end of June 2025 (2 bathroom(frosted), 1 hallway,1 dining room and two big bay windows complete with 2 window boards). Took 5 days in total as bay windows were load bearing ,the window boards were not in warehouse so took extra time to arrive and fit , the silicone/mastic finish wasn’t great and they cut one end of a window board wrong , but after a telephone call a new team of fitters came out and rectified the mistakes of original fitters that we had noticed , a window pane had got scratched in delivery so they replaced that as well. This was a big job that entailed some mistakes but over time was rectified by bowalker windows by sending out another team of fitters to fix some minor mistakes of original fitters . We went on a recommendation from a work colleague who had used Bowalker windows in the past as were very good. Maybe just improve your fitters mastic silicone skills a bit more but is is an old house of 110 years and nothing is level in this house

Mark Fitzpatrick 4 months ago

As a property developer operating across Brighton and Hove, I rely on trusted trades who consistently deliver — and Bowalker Windows Ltd, led by Zack Newman, is one of those partners. We specify their windows across all our developments because their products meet the high standards our clients expect, installations are completed on schedule, and site coordination with our contractors is seamless. Zack is responsive, pragmatic, and straightforward about lead times and costs, which makes planning and handovers far easier. Their workmanship is excellent, energy-performance claims are reliable, and they stand behind their warranty. Competitive pricing, professional teams, and reliable aftercare mean we’ll continue to use Bowalker Windows on future projects. Highly recommended for any developer or home owners in the Brighton & Hove area.

mark Matthew 4 months ago

5 stars! I recently had all the windows in my home replaced by Bowalker Windows and couldn’t be happier with the result. From my very first contact I worked with Zack Newman — he was professional, knowledgeable, and transparent about pricing and timelines. The installation team arrived on time, worked efficiently, and left the house clean. The new windows look fantastic, operate smoothly, and have already made a noticeable difference in comfort and noise reduction. Excellent customer service from start to finish — I highly recommend Zack and Bowalker Windows to anyone looking for quality work and a hassle-free experience.

Graeme Edited 5 months ago

I am 9 years into our windows installation from Bowalker Windows. I emailed them on Sunday with an issue and by 3pm Monday afternoon they were at my home sorting the issue. This company's attitude to exceeding customer service and going the extra mile is in their DNA. These guys are just amazing from cradle to grave when it comes to windows and doors. I wouldn't go anywhere else. Simply fantastic.

Tatiana Gurova 6 months ago

The installation went quickly and without any problems. I recommended them as excellent specialists.

Joanna Steadman 6 months ago

We have used Bowalker on several occasions for replacement windows and doors and have always been pleased with the work, product price snd communication

Enhance the comfort, style, and energy efficiency of your home with our premium windows and doors, contact us today.

01444 810 111

Meet Our Team

Our team at Bowalker comprises highly skilled uPVC window installers who deliver premium uPVC window installations and replacements with precision and care. Every uPVC window installer works fully in-house, ensuring consistent workmanship, accountability and a smooth experience from consultation to completion. We are committed to improving your home’s comfort, thermal efficiency and external appearance, with a focus on customer satisfaction, reliable performance, low-maintenance durability and professionally fitted uPVC window solutions.

uPVC Windows Project Gallery

Two anthracite sash windows in Hassocks

Ready to Get Started with Bowalker uPVC Windows?

Installing uPVC windows can improve your home’s thermal efficiency, exterior appearance and overall comfort while providing better insulation and low-maintenance durability. Bowalker provides a full-service uPVC window installation and replacement experience with a fully in-house team of uPVC window installers, premium glazing systems and a 10-year insurance-backed guarantee to ensure reliable quality and dependable performance.

Call 01444 810 111 today to arrange your free uPVC window consultation and receive a no-obligation quote. Our experienced uPVC window installation and replacement team manages every stage with precision, ensuring your uPVC windows are professionally fitted to improve energy efficiency, reduce outside noise and complement your property’s architectural style.

Enhance the comfort, style, and energy efficiency of your home with our premium windows and doors, contact us today.

01444 810 111

Frequently Asked Questions

What are uPVC Windows?

uPVC windows are modern window systems manufactured from unplasticised polyvinyl chloride, a rigid and highly durable material known for its strength, weather resistance and low-maintenance properties. They are a popular alternative to timber and aluminium windows because uPVC frames resist warping, rotting and corrosion while delivering high thermal efficiency, reliable insulation and long-lasting everyday performance.

How Much Does uPVC Windows Installation Cost?

The installation cost of uPVC windows ranges from £280 to £1,400 per window, depending on window size, frame style, glazing type, hardware quality and labour requirements. Small fixed uPVC windows generally fall near the lower end of the price range, while large bay windows, sliding systems or double-glazed custom units increase the overall installation cost.

What Types of uPVC Glass Are Available?

The most common types of uPVC window glass available include double glazing, triple glazing, toughened glass, laminated glass, frosted glass, acoustic glass and decorative glazing options. Each glass type is designed to enhance specific features such as thermal efficiency, privacy, noise reduction, security or natural light, while complementing modern and traditional uPVC window designs.

How Long Does uPVC Windows Installation Take?

uPVC window installation for a full house, such as a 3-bedroom property, usually takes 1 to 2 days, while individual standard uPVC windows take around 30 minutes to 2 hours to install, depending on the window size and fitting requirements. Installation times can also vary based on property access, the number of windows being replaced and any bespoke glazing or frame requirements.

What Guarantee Do You Provide on uPVC Windows Installation?

At Bowalker, we provide a 10-year insurance-backed guarantee for all uPVC window installation and replacement services, supporting long-term reliability, installation quality and compliance with professional fitting standards. Every uPVC window installation is completed by our fully in-house installation team and supported by FENSA-registered certification confirming compliance with current Building Regulations for thermal performance, safety and ventilation.

Do I Need to Be at Home During the Installation?

No, you do not need to be home during your uPVC window installation, as long as we have access to the property and your requirements are confirmed beforehand. Our fully in-house uPVC window installers complete all fitting work professionally, ensuring careful handling, property security and installation carried out according to your agreed specifications.

How Much Does It Cost to Replace uPVC Windows?

The cost to replace uPVC windows ranges from £450 to £3,000+ per window, depending on window size, glazing type, frame style, installation complexity and any structural modifications required during replacement. Small standard replacement windows generally fall near the lower end of the range, while large custom-designed, triple-glazed or bay-style uPVC windows can exceed £3,000.

What Are the Maintenance Tips for uPVC Windows?

Maintenance tips for uPVC windows include cleaning the frames every 3 to 4 months with warm soapy water or non-abrasive cleaners, lubricating hinges and locking systems annually, and keeping drainage holes clear of dirt and debris. Homeowners should also avoid harsh chemicals, bleach and acidic cleaning products, as these materials can damage window seals, affect frame performance and cause uPVC discolouration over time.