Transform Your Home with Premium Double-Glazed Windows

Transform your home with premium cottage window installation and replacement from Bowalker Windows. Our in-house installers fit every cottage window with precision, maintaining traditional styling and secure performance throughout. All installations are FENSA-registered (reg. 33081) and backed 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 Double-Glazed Windows Installation and Replacement Services

As a trusted double glazing installer, Bowalker Windows Limited provides premium double-glazed window installation and replacement services for homeowners who want better insulation, stronger security and a finish that complements their property. Founded in 2009, we deliver a stress-free, full-service process with clear communication, fixed pricing and a fully in-house team, with no subcontractors or handoffs at any stage.

We measure every opening precisely and install casement, sash, tilt-and-turn, sliding, fixed and roof double-glazed windows. Our systems use energy-efficient glazing, secure multipoint locking hardware and weather-tight seals to deliver reliable thermal comfort and noise reduction. Where existing units have misted panes or failed seals, we carry out full replacements to restore performance and clarity.

Call Bowalker Windows on 01444 810 111 for expert double-glazed window installation and replacement services. Our in-house team handles surveying, specification, fitting and final inspection with FENSA registration (33081) and a 10-year insurance-backed guarantee for peace of mind.

Materials

uPVC
Timber

Standard Hardware

Chrome
Satin
Gold Knob
Antique Black Knob

Standard Colours

Smooth White
Cream
Painswick Grey
Chartwell Green
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 Double-Glazed Windows Installation Services?

Homeowners choose Bowalker Windows Limited for double-glazed window installation because we deliver premium workmanship, a stress-free full-service process and consistent accountability from a fully in-house team. Founded in 2009, we have completed double-glazed window projects across Sussex, Surrey and London, from single-window replacements in period homes to full-house installations in modern extensions and new builds. Our 10-year insurance-backed guarantee, FENSA compliance (Reg No. 33081) and fixed pricing mean you know exactly what you are getting before work begins, with no subcontractors and no surprises.

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 Double-Glazed Windows We Install and Replace

A casement double-glazed window is a hinged window that opens outward like a door, providing smooth operation and controlled ventilation. This style closes tightly against weather seals, helping reduce draughts and improve thermal comfort.

Bowalker Windows Limited fits casement windows with high-performance double glazing, secure locking systems and durable hardware for long-term reliability. If you are replacing older units, we match the opening style and sightlines while improving insulation and security.

Our in-house window installers fit sash double-glazed windows with smooth vertical sliding panels that keep a traditional frontage while improving day-to-day comfort. This window style suits period homes and character properties because it supports controlled ventilation and tidy sightlines.

We measure each opening precisely and fit double glazing with secure locking and draught-resistant seals for reliable performance. For older sash windows, we retain the classic proportions while improving insulation, noise reduction and security.

We install tilt and turn double-glazed windows for homeowners who want flexible ventilation and easy cleaning from inside the room. Turning the handle 180 degrees opens the window fully inward (turn mode) for cleaning or unrestricted access, while tilting the handle to 90 degrees opens only the top of the sash inward for secure, controlled ventilation.

This design works well for upper floors and busy family homes because it allows fresh air without compromising security. Our window fitter team measures precisely and fits secure hardware with tight weather seals for reliable comfort.

At Bowalker Windows Limited, we fit sliding double-glazed windows that operate on smooth horizontal tracks, making them a practical choice where outward-opening space is limited. This style supports wide views and consistent ventilation control, which suits modern extensions and rooms facing patios or gardens.

We install durable frames, high-performance double glazing and secure locking for dependable comfort and safety. If you are upgrading older sliders, we improve glide performance, sealing and insulation while keeping the same opening format.

Fixed double-glazed windows create a sealed, non-opening glazed unit that delivers strong thermal insulation, reduced draught risk and clear, uninterrupted sightlines for maximum natural light. This style suits picture windows, stairwell glazing, bay fillers and living spaces where ventilation is handled elsewhere.

Bowalker Windows measures each opening precisely and fits high-performance double glazing with secure beading and weather-tight seals. Where existing fixed panes have aged or misted, we replace the unit to restore clarity and improve thermal efficiency.

Our experienced window fitters install roof double-glazed windows that bring natural light into lofts and extensions while supporting thermal comfort and weather protection year-round. These units use two panes of glass with a 12-16mm insulating cavity to reduce heat loss and limit external noise.

All installations comply with Building Regulations Part L and are registered with FENSA upon completion. We measure each aperture accurately and fit secure flashings and airtight seals. Where older units have failed seals or persistent condensation, we replace them to restore clarity and efficiency.

Arched and cathedral cottage windows feature curved or taller pointed tops, adding vertical emphasis and architectural interest inspired by classical or Gothic elements. They can be fixed, casement or sash styles and suit gable ends or prominent cottage elevations.

Bowalker Windows carries out expert replacement and installation of arched and cathedral cottage windows using durable materials such as timber, thermally broken aluminium or mechanically jointed uPVC for seamless curves. Fitted with high-performance double or triple glazing, they ensure energy efficiency, security and low maintenance whilst preserving historical character and meeting modern comfort standards in traditional homes.

Oriel cottage windows project from the upper floor, supported by corbels or brackets, creating a distinctive cantilevered boxed appearance without extending to ground level. Common in Tudor, Victorian or traditional architecture, they increase natural light, enhance views and add unique character.

At Bowalker, we install and replace oriel cottage windows using durable framing systems in uPVC, aluminium or timber with high-performance glazing options, ensuring energy efficiency, security and low maintenance. They are ideal for first-floor elevations in countryside cottages, preserving historical integrity whilst boosting architectural appeal and interior comfort.

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 Double-Glazed Windows?

Installing double-glazed windows helps reduce heat loss, cut down on heating costs, lower outside noise and improve home security. Modern double glazing uses two panes of glass with a sealed insulating cavity and well-fitted frames to improve thermal performance and day-to-day comfort. This setup helps keep rooms warmer through winter, cooler in summer and reduces the chance of condensation forming on the inside pane.

Six benefits of installing Double-Glazed windows are:

Retains Heat

Slows heat transfer through the glass, so your home retains warmth for longer.

Helps Lower Energy Bills

Better insulation means your heating does not need to work as hard to maintain a steady temperature.

Reduces Outside Noise

Creates an acoustic buffer that reduces noise penetration, particularly in homes near main roads, schools or high-traffic areas.

Improves Home Security

Provides stronger protection with secure frames, reinforced glazing and modern locking hardware.

Reduces Condensation

Helps limit moisture build-up on the glass by keeping the inner pane warmer.

Keeps Your Home Comfortable Year-Round

Reduces draughts and temperature swings so rooms feel more consistent in every season.

How to Get Started With Double-Glazed Windows Installation and Replacement at Bowalker?

Getting started with double-glazed window installation and replacement at Bowalker involves booking a free consultation, receiving a no-obligation quote and proceeding to installation with our in-house team. During the survey, our installers measure each opening precisely and confirm the window specification that best suits your home’s structure, style and performance requirements before agreeing a clear installation plan.

Get In Touch

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Areas We Serve

Bowalker provides professional double-glazed window installation and replacement services across Sussex, Surrey and London, delivering consistent workmanship, precise fitting and reliable aftercare for homeowners throughout these regions.

What Our Happy Customers Say

EXCELLENT

Based on 36 reviews

Google Review

Write a Review

Mark 22 hours ago

Had a problem with our door which was installed 3 years ago - Bowalker - Dean - came to site within 24 hours and helped resolved- thank you ! Very pleased with professional and prompt service

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 10 months ago

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

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, experienced window fitters and installation specialists who deliver premium installations with precision and care. Every double-glazed 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.

Double Glazed Windows Project Gallery

Two anthracite sash windows in Hassocks

Ready to Get Started with Bowalker Double Glazed Windows?

Installing double-glazed windows helps improve your home’s warmth, reduce outside noise and support lower heating costs while strengthening security and day-to-day comfort. If you are replacing older, tired units or fitting new windows as part of a renovation, Bowalker Windows Limited provides a hassle-free, full-service installation delivered by a fully in-house team of installers, with premium glazing systems and a 10-year insurance-backed guarantee for long-term reliability.

Call 01444 810 111 to arrange your free consultation and receive a no-obligation quote. Our double-glazed window installation team manages every stage with precise measurement and careful fitting, ensuring each window performs reliably and complements the style of your property.

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 double-glazed windows?

Double glazed windows use two panes of glass separated by a sealed insulating gap to reduce heat loss and improve comfort. The sealed unit helps cut draughts, reduce outside noise and limit condensation on the inside pane. When paired with modern frames and secure locking, double glazing also enhances home security and reduces day-to-day energy use.

How Much Does Double-Glazed Window Installation Cost?

Double-glazed window installation costs £500 to £1,200 per window installed in the UK, with larger or bespoke units priced higher. Standard casement windows begin from around £1,200 supply and installed, while mid-range options such as panoramic windows and bifold doors typically range from £6,000 to £12,000, and larger or more complex glazed units can reach £14,000 or more. The final price depends on factors such as window size, frame material (uPVC, aluminium or timber), glazing specification, hardware and security features and site access. Bowalker provides a no-obligation quote after a measured survey, with fixed pricing and a clear scope.

What Glazing Options Are Available With Bowalker Windows?

Bowalker offers a range of glazing options, so you can match your double-glazed windows to comfort, security, noise control and privacy needs.

Low-E Glass: Keeps more heat inside.
Argon-Filled Units: Improves insulation in the sealed gap.
Acoustic Glass: Helps reduce outside noise.
Toughened or Laminated Glass: Adds safety and security.
Obscure Glass: Adds privacy while letting light in.

What Materials Are Double-Glazed Windows Made From?

Double-glazed windows are commonly made from uPVC, aluminium or timber, with the frame material selected based on the look you want, maintenance preferences and budget. uPVC is popular for low maintenance and good insulation; aluminium suits slim, modern frames and offers strong durability; and timber offers a classic finish that works well on traditional properties while still supporting modern double glazing.

How Long Does Double-Glazed Window Installation Take?

Double-glazed window installation takes 1 to 2 hours per window, depending on window size, access and the condition of the existing opening. A straightforward replacement can be completed more quickly, whereas larger units or structural adjustments take longer. For many UK homes, a full set of windows is often fitted over 1 to 2 days, with time allowed for careful sealing, trims and final checks.

What Guarantee Do You Provide on Double-Glazed Window Installation?

Bowalker Windows Limited provides a 10-year insurance-backed guarantee on all double-glazed window installations, ensuring peace of mind and long-lasting performance. This covers workmanship and installation quality, giving homeowners confidence that their double-glazed windows are installed to the highest professional standards and comply with FENSA regulations.

Do I Need to Be at Home During the Installation?

No, you do not need to be home for the double-glazed window installation as long as we have access to the property and your preferences are confirmed in advance. Our fully in-house team of installers will carry out the work professionally, ensuring secure handling, careful installation and full adherence to your specified double glazed window design and requirements.

How Much Does It Cost to Replace Double Glazed Windows?

Replacing double glazed windows costs £500 to £1,500+ per window in the UK, depending on the size and specification of the new unit. Standard casement replacements begin from around £1,200 supply and installed, rising to £6,000–£14,000 or more for larger formats such as panoramic windows, bifold doors and glazed lanterns. Prices vary based on factors such as frame material (uPVC, aluminium or timber), glazing upgrades (Low-E, acoustic or laminated), hardware and security features and whether any repairs to the existing opening are needed. Bowalker provides a no-obligation quote after a measured survey, with fixed pricing so the figure agreed before work begins is the figure you pay.

What Are the Maintenance Tips for Double Glazed Windows?

Double glazed windows stay in good condition with simple, regular care. Clean the glass and frames with mild soapy water, then rinse and dry to avoid streaks. Check the seals and drainage slots for dirt or blockage, especially after heavy rain. Lubricate hinges, handles and locking points once or twice a year for smooth operation. Watch for issues such as stiff openings, draughts or misting between panes, as these can indicate worn seals or a failed glazed unit.