Transform Your Home with Premium Casement Windows

Upgrade your home with premium casement window installation and replacement from Bowalker Windows. Our in-house team carefully measures and fits every casement window, ensuring secure installation, smooth operation and a precise finish throughout. All work is FENSA-registered (reg. 33081) and covered by a 10-year insurance-backed guarantee.

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

Professional Casement Windows Installation and Replacement Services

As a trusted casement window installer, Bowalker Windows Limited delivers professional casement window installation and replacement services for homeowners seeking energy-efficient, secure and stylish window solutions that improve property value and indoor comfort. Founded in 2009, the company installs uPVC, aluminium and timber casement windows, available with double or triple glazing, ensuring each window system matches the property design and supports long-term performance.

Our in-house installers measure, supply and fit each casement window with precision, ensuring the frame, sash, hinge and glass unit create a tight seal and operate smoothly. Casement windows open outward on side-hung or top-hung hinges, promoting ventilation and airflow throughout the home. Each installation uses durable, weather-resistant materials, insulated glazing and secure locking systems to reduce heat loss and protect the home.

Call Bowalker Windows Limited at 01444 810 111 to schedule your casement window installation or replacement service. Our in-house team delivers precise measurement, professional fitting, and final inspection, supported by FENSA registration (33081) and a 10-year insurance-backed guarantee for reliable performance.

Materials

Timber
uPVC
Aluminium

Standard Hardware

White
Brushed Chrome
Gold
Chrome

Standard Colours

White woodgrain
Anthracite Grey
Black
Cotswold Green
Biscuit
Silver Oak
Dual Colour
Paint to Order

Glass

Triple Glazed
Astragal Bars
Leaded

Standard Layouts

1 over 2
Single
1 over 1

Our Certifications And Professional Standards

Why Homeowners Choose Bowalker for Casement Windows Installation Services?

Homeowners rely on Bowalker Windows for casement window installation because the service combines precise workmanship, a structured installation process and the consistency of a fully in-house team. Established in 2009, the company operates with FENSA registration (reg. 33081) and provides a 10-year insurance-backed guarantee, ensuring each installation meets high standards of performance and safety. Bowalker installs durable, energy-efficient casement windows that improve insulation, ventilation and security. From initial consultation to final inspection, the team manages every stage carefully, delivering reliable window solutions tailored to each property.

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 Casement Windows We Install and Replace

Side-hung casement windows are hinged on the side of the frame and open outward to the left or right, providing controlled airflow and a full, unobstructed opening. This configuration is best suited to bedrooms, living areas and kitchens where ventilation and natural light are a priority.

Bowalker installs and replaces side-hung casement windows in durable uPVC or aluminium frames, ensuring a precise fit, secure multi-point locking and smooth hinge movement for reliable everyday use.

A single casement window contains one operable sash within a single frame, available side-hung, top-hung or bottom-hung depending on ventilation requirements. Unlike a double casement, which opens from the centre with two sashes, a single casement keeps the design compact and straightforward.

Well suited to bathrooms, kitchens and utility rooms where consistent airflow and ease of cleaning are required, Bowalker installs and replaces single casement windows in uPVC or aluminium frames, ensuring a secure fit, correct sealing and reliable long-term performance.

Double casement windows, also known as French casement windows, consist of two side-hinged sashes that open outward from the centre without a fixed mullion, creating a wide, unobstructed opening that maximises natural light and ventilation. Best suited to living rooms, dining areas and front-facing spaces where clear views and airflow are priorities.

Bowalker installs and replaces double casement windows with precision-aligned frames and balanced sashes, ensuring seamless opening, secure locking and enhanced visual appeal.

Flush casement windows sit level within the frame, creating a clean-lined appearance that replicates traditional window styles with a flat exterior finish and tight seal that improves insulation and energy efficiency. Ideal for period properties, cottages and contemporary homes requiring a classic yet modern look.

Bowalker installs and replaces flush casement windows with bespoke design options including a full range of colour finishes and frame materials. Every installation is tailored to match the property's architectural style whilst delivering durable, low-maintenance performance.

Stormproof casement windows feature an outer lip on the frame that overlaps the sash when closed, providing additional protection against wind and rain alongside robust weather-resistant seals and multi-point locking for enhanced security. Best suited to coastal locations, hilltop positions and properties prone to severe weather.

Bowalker installs and replaces stormproof casement windows using durable uPVC or aluminium frames with EPDM weather seals and A-rated double or triple glazing. Every installation ensures a secure fit, improved insulation and reliable long-term performance in the most exposed environments.

Top-hung casement windows, also known as awning windows, are hinged at the top and open outward from the bottom, allowing ventilation even during rain. This window features a sleek, functional design that provides privacy while maintaining airflow.

It is best suited to areas where space is limited or where you need ventilation without compromising security, such as kitchens, bathrooms and basements. Bowalker handles the installation and replacement of top-hung casement windows with precision, using durable materials such as uPVC or aluminium, ensuring smooth operation, excellent weather resistance and long-lasting performance.

Bottom-hung casement windows, also known as hopper windows, are hinged at the bottom and tilt inward for ventilation, offering a secure and space-efficient design. This window features smooth tilting action and a tight seal that improves energy efficiency and insulation.

It is ideal for basements, bathrooms or small spaces where top-hung windows are impractical but airflow is still required. Bowalker installs and replaces bottom-hung casement windows using high-quality materials such as uPVC or aluminium, ensuring a secure fit, easy operation and reliable performance that withstands daily use.

Fixed-light windows, also known as picture windows, are non-operable glazed panels designed to frame outdoor views and maximise natural light. With no opening sash, they suit living rooms, dining areas and any space where an expansive outlook takes priority over ventilation.

Bowalker installs and replaces fixed-light windows using energy-efficient double or triple glazing in durable uPVC or aluminium frames, ensuring excellent thermal performance and a clean finish that complements the wider casement window installation.

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See Our Work In Action

What Are the Benefits of Installing Casement Windows?

Casement windows improve ventilation by opening fully, providing better airflow. They enhance energy efficiency with a tight seal that reduces draughts and heat loss. Known for their robust security features, casement windows offer added safety with strong locking systems. Available in various styles and materials, they boost property value and complement both modern and traditional homes.

The eight key benefits of installing casement windows are:

Excellent Ventilation Control

Casement windows open fully, allowing maximum airflow and better ventilation compared to other window types.

Superior Energy Efficiency

The tight seal of casement windows reduces heat loss and drafts, improving energy efficiency.

Enhanced Security

Their robust locking mechanisms make casement windows more secure against potential intruders.

Clear, Unobstructed Views

The design provides wide, unobstructed views, ideal for maximising natural light.

Easy Operation

Casement windows are easy to open and close with smooth, reliable hinges and handles.

Versatile Design Options

Available in various materials and finishes, they complement different architectural styles.

Better Weather Protection

Their design provides superior protection against wind, rain and harsh weather conditions.

Low Maintenance

With durable materials such as uPVC and aluminium, casement windows require minimal upkeep and are easy to clean.

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

Getting started with casement window installation and replacement at Bowalker begins by booking a free consultation, followed by a no-obligation quote. Our expert team assesses your property, discusses your preferences and recommends the ideal casement window options to match your style and performance needs. Once you approve the quote, our in-house team will schedule the installation, ensuring precise fitting, energy efficiency and long-term reliability.

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Areas We Serve

Bowalker provides professional casement window installation and replacement services across Sussex, including Brighton, Hove, Hassocks, Burgess Hill, Haywards Heath, Horsham, Lewes, Uckfield and surrounding areas. Our local installation team delivers reliable service, precise fitting and consistent support, ensuring every homeowner receives high-quality window solutions tailored to their property.

What Our Happy Customers Say

EXCELLENT

Based on 36 reviews

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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 window installers and specialists who deliver precision installations with care and consistency. Every casement window installer works fully in-house, ensuring consistent quality, accountability and a seamless experience from consultation to completion. We are committed to making your home warm, safe and stylish, with a focus on customer satisfaction and long-lasting performance.

Sash Windows Project Gallery

Two anthracite sash windows in Hassocks

Ready To Get Started With Bowalker Casement Windows?

Installing casement windows enhances your home’s comfort, energy efficiency and kerb appeal while improving ventilation and security. Bowalker Windows offers a seamless, full-service installation with its skilled in-house team of installers, durable window systems and a 10-year insurance-backed guarantee for long-lasting performance.

Call 01444 810 111 today to book your free consultation and receive a no-obligation quote. Our expert team will manage every step of the process, ensuring precise installation for optimal performance and style tailored to your home.

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 Casement Windows?

Casement windows are hinged on the side or top, opening outward to provide excellent ventilation and unobstructed views. They are designed for easy operation, with a secure locking system and an airtight seal that improves energy efficiency and security.

How Much Does Casement Window Installation Cost?

Casement window installation costs range from £350 to £1,800 per window supplied and fitted, depending on frame material, size, glazing type and finish. uPVC casement windows typically cost £350 to £900 fitted, aluminium from £700 to £1,600 and timber from £950 to £1,800 or more.

At Bowalker, the installation rate for a casement window is £150, charged on top of the supply price, with standard casement windows starting from £1,084.52 for a 600×900 unit, rising to £1,861.39 for 1200×1200 and £2,451.40 for 1800×1200.

What Materials Are Casement Windows Made From?

Casement windows are made from various materials, including uPVC, aluminium and timber. Each material offers unique benefits, such as durability, energy efficiency and low maintenance, allowing homeowners to choose the best option for their style and needs.

How Long Does Casement Window Installation Take?

Casement window installation takes 2 to 4 hours per window, depending on the window size and installation complexity. A full installation for an average-sized home can take one or two days, including preparation and finishing touches.

What Guarantee Do You Provide on Casement Window Installation?

Bowalker Windows offers a 10-year insurance-backed guarantee on all casement window installations. This guarantee covers both the workmanship and the materials used, ensuring long-term reliability and peace of mind for homeowners.

Do I Need to Be at Home During the Installation?

No, you do not need to be at home during the installation once access to the property has been arranged with our team. Our in-house installers will work to a clear schedule, keep disruption to a minimum, remove and dispose of all old frames and ensure every window is securely fitted, sealed and tested before they leave.

How Much Does It Cost to Replace Casement Windows?

Replacing casement windows in the UK costs between £500 and £1,800 per window, depending on frame material, size, glazing specification and installation complexity. Flush casement windows cost £450 to £750 supply only, and adding triple glazing adds £100 to £150 per window. Additional features such as Georgian bars, special RAL colours or acoustic glass increase the cost further.

At Bowalker, standard casement window supply prices start from £1,084.52 (600×900), with a £150 installation rate applied on top, inclusive of VAT, surveying, disposal of the old window and the 10-year insurance-backed guarantee. Contact the team for a no-obligation quote tailored to your property.

What Are the Maintenance Tips for Casement Windows?

To maintain casement windows, regularly clean the glass and frame, lubricate hinges and locks to ensure smooth operation, and check the seals to prevent draughts. For uPVC or aluminium frames, a simple wipe-down with a damp cloth is sufficient, whilst timber frames may require occasional painting or sealing to protect against moisture.

Casement Windows