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Transform Your Home with Premium Double-Glazed Windows
Upgrade your home with double-glazed window installation and replacement from Bowalker Windows. Our fully in-house team surveys and installs every window with precision, backed by FENSA registration (33081) and a 10-year insurance-backed guarantee for lasting thermal comfort, stronger security and complete peace of mind.
- Dimensions Max size 2.5M high x 1.5M wide
- Thermally Broken As standard
- Glass Astragal bars, Satin, Double Glazed
Certifications And Partners
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 survey, install and replace casement, sash, tilt and turn, sliding and fixed double-glazed windows, ensuring each installation complements the property’s architectural style and performance requirements. 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
Types of Double-Glazed Windows We Install and Replace
Double Glazed Sash Windows
Double Glazed Sash Windows
Combining the traditional vertical sliding design of classic sash joinery with modern sealed glazing units and Low-E glass, double glazed sash windows remain one of the most popular choices for Georgian, Victorian and Edwardian properties. Homeowners looking to preserve period character whilst improving comfort, security and energy efficiency benefit from modern glazing technology, engineered timber, uPVC or aluminium frame options and authentic sash detailing. We install and replace double glazed sash windows with argon-filled sealed units, warm-edge spacer bars, secure locking hardware and carefully proportioned frames, helping improve insulation whilst maintaining traditional sightlines and smooth everyday operation.
Learn More →Double Glazed Flush Windows
Double Glazed Flush Windows
Sitting level within the frame rather than projecting outward, double glazed flush windows recreate the clean exterior profile of traditional timber joinery whilst improving thermal performance and weather resistance. They suit period properties, conservation areas and modern homes where minimal frame lines and sympathetic styling are important. Our in-house installers install and replace flush windows with slimline argon-filled double glazed units, Low-E glass, warm-edge spacer bars and secure multipoint locking systems across uPVC, timber and aluminium frame options, helping preserve architectural character whilst improving comfort, security and long-term reliability.
Learn More →Designed for period properties where preserving original proportions and detailing is important, double glazed heritage windows use slimline sealed units to replicate the appearance of traditional single glazing whilst improving thermal performance. They are particularly suitable for listed buildings, conservation areas and character homes where frame sightlines, glazing bars and moulding details must remain sympathetic to the existing architecture. Bowalker Windows installs and replaces double glazed heritage windows with carefully matched profiles, period-appropriate detailing and high-performance glazing, helping maintain historic character whilst improving comfort, weather resistance and everyday usability.
Learn More →Most closely associated with Victorian terraced houses and Edwardian properties, bay windows add projection, natural light and architectural interest to a room. Modern double glazed bay windows retain this traditional structure whilst incorporating sealed glazing units designed to improve insulation, security and comfort. We install and replace double glazed bay windows with Low-E glass, argon-filled sealed units, warm-edge spacer bars and carefully fitted weather seals across uPVC, aluminium and timber frames, helping maintain the characteristic silhouette whilst improving thermal performance.
Learn More →Where a standard rectangular frame would reduce architectural impact, double glazed arched windows introduce a curved head that creates a distinctive feature within period and contemporary properties. Accurate manufacturing is essential to maintain consistent sightlines and proportions across the curved section. Our in-house installers install and replace double glazed arched windows with shaped frames, secure glazing systems and energy-efficient sealed units, improving insulation, security and comfort whilst preserving the architectural character of the opening.
Learn More →Traditional rural styling, divided-light detailing and period proportions define double glazed cottage windows, making them suitable for cottages, farmhouses and character properties where appearance and performance must work together. Features such as Georgian bars, astragal detailing and heritage-style mouldings help recreate traditional designs whilst modern sealed units improve insulation and security. By fitting engineered timber, woodgrain uPVC, or aluminium frames with energy-efficient glazing and durable finishes, we ensure every double glazed cottage window installation preserves the property's charm whilst improving everyday comfort.
Learn More →Carefully matched profiles, glazing proportions and traditional detailing distinguish double glazed historic windows from standard replacements. They are designed for listed buildings and heritage properties where maintaining original character satisfies both personal preference and the requirements of Historic England guidance and local conservation officers. To achieve that balance, Bowalker installs and replaces double glazed historic windows with sympathetic frame designs, slimline units using cavities, period mouldings and lamb's tongue detailing where required, helping homeowners improve thermal comfort and weather resistance without compromising architectural integrity.
Learn More →Large fixed glazed areas make double glazed picture windows ideal for living rooms, extensions and feature elevations where natural light and uninterrupted views are priorities. Because fixed units contain no opening hardware or compression seals subject to repeated use, they eliminate draught paths and consistently achieve whole-window U-values of 1.2-1.4 W/m²K. We install and replace double glazed picture windows with argon-filled Low-E sealed units, warm edge spacer bars and secure structural frames, creating bright interiors with improved insulation, comfort and long-term reliability.
Learn More →Slim sightlines, structured glazing bars and a distinctive industrial appearance define double glazed Crittall-style windows, making them popular for contemporary extensions, internal partitions and period renovations. Modern versions commonly use thermally broken aluminium frames to recreate the appearance of traditional steel whilst improving thermal performance. Our in-house installers fit double glazed Crittall-style windows with secure multipoint hardware, powder-coated frames in anthracite, black or custom RAL colours, and carefully aligned glazing bars. Low-E argon-filled sealed units help achieve strong thermal performance in line with current Building Regulations requirements where applicable.
Learn More →Double Glazed uPVC Windows
Double Glazed uPVC Windows
The most widely used residential window material in the UK, uPVC combines low-maintenance performance with strong thermal efficiency across most property types and budgets. Multi-chambered profiles paired with Low-E glass and argon gas fill consistently achieve whole-window U-values that meet Approved Document L requirements for replacement windows. We install and replace double glazed uPVC windows with energy-rated sealed units, secure multipoint locking systems and a choice of colours and woodgrain foil finishes including anthracite grey, agate grey and Irish oak.
Learn More →Double Glazed Aluminium Windows
Double Glazed Aluminium Windows
Strong, slim and designed to span wider openings without bulky framing, aluminium is the preferred frame material for contemporary homes, extensions and commercial conversions where sightline width and design flexibility are priorities. Polyamide thermal breaks interrupt the frame's natural conductivity, bringing whole-window U-values in line with uPVC and meeting Approved Document L requirements. Bowalker installs and replaces double glazed aluminium windows with Low-E argon-filled sealed units, secure multipoint hardware and powder-coated finishes across the full RAL colour palette including dual-colour options.
Learn More →For period properties, conservation areas and homes where natural materials are preferred, double glazed timber windows combine traditional craftsmanship with modern glazing performance. Engineered and laminated timber frames improve stability over traditional solid joinery, whilst Low-E glass, argon-filled sealed units and warm-edge spacer bars achieve whole-window U-values meeting Approved Document L requirements. We install and replace double glazed timber windows using durable microporous paint or stain finishes, traditional ironmongery and carefully matched profiles, maintaining character whilst improving comfort and longevity.
Learn More →Double Glazed Fixed Windows
Double Glazed Fixed Windows
Non-opening by design, fixed windows provide large glazed areas with minimal visual interruption, making them suitable for feature elevations, stairwells and rooms where ventilation is provided by surrounding opening windows. Without opening hardware or compression seals subject to repeated use, they eliminate draught paths and help achieve strong thermal performance when correctly specified and installed. We install and replace double glazed fixed windows with argon-filled Low-E sealed units, warm edge spacer bars and secure structural frames, creating bright interiors with reliable insulation and clean architectural lines.
Learn More →The most common replacement window style in the UK, double glazed casement windows combine side-hung or top-hung opening sections with insulated glazing and secure locking systems to provide practical ventilation, security and energy efficiency across most property types. Suitable for both modern homes and period properties, they offer flexible configurations whilst maintaining strong thermal performance and everyday usability. Our in-house installers install and replace double glazed casement windows with Low-E argon-filled glazing, multipoint locking systems, compression weather seals and accurately surveyed frames, with PAS 24-compliant security options available where required to provide enhanced protection and peace of mind.
Learn More →Tilt and turn windows provide two opening functions within one frame, allowing the sash to tilt inward at the top for controlled ventilation or swing fully open on the vertical axis for safe internal cleaning. They are particularly suitable for apartments, upper-floor rooms and modern properties where convenience and airflow are priorities. We install and replace double glazed tilt and turn windows with argon-filled sealed units, espagnolette locking hardware and precision-engineered mechanisms, combining practical operation with strong thermal performance.
Learn More →Recreating the appearance of traditional sash joinery, double glazed vertical sliding windows combine classic proportions with modern glazing performance using spring-loaded spiral balance or counterbalanced systems in place of traditional cords and weights. They are particularly suited to Georgian, Victorian and Edwardian properties where maintaining period character is important. Bowalker Windows installs and replaces these windows with smooth balance systems, secure cam locks, Low-E argon-filled glazing and draught-resistant seals, preserving authentic appearance whilst improving comfort and usability.
Learn More →Designed for wide openings, double glazed bifold windows use multiple folding panels tracked on a bottom rail to create a seamless connection between indoor and outdoor spaces that no single casement could achieve. They are popular for extensions, garden rooms and open-plan areas where natural light and flexibility are priorities. Our in-house installers install double glazed bifold windows with precision-engineered aluminium or timber frames, secure multipoint locking hardware, weather-resistant seals and Low-E argon-filled glazing, creating practical openings with lasting reliability.
Learn More →Window Brands We Install
Our team at Bowalker is made up of highly skilled, certified window installers and specialists who deliver premium, luxury installations with precision and care. Every window installers work 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, focusing on customer satisfaction and long-lasting performance.
Not sure which brand is right for your home? Talk to our team →
Why Homeowners Choose Bowalker For Double-Glazed Windows Installation Services
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
Double Glazed Windows Project Gallery
What Are the Benefits of Installing Double-Glazed Windows?
Installing double-glazed windows helps reduce heat loss, improve thermal efficiency, lower outside noise and strengthen home security. Modern double glazing uses two panes of glass separated by a sealed insulating cavity, with energy-efficient glazing and correctly installed frames helping maintain more consistent indoor temperatures throughout the year. This can improve comfort during colder months, reduce draughts and help your heating system operate more efficiently without compromising ventilation or natural light.
Retains Heat
Double glazing slows heat transfer through the glass, helping your home maintain warmth for longer and improving overall comfort during colder periods.
Helps Improve Energy Efficiency
Better insulation reduces unnecessary heat loss through windows, helping your heating system maintain a stable indoor temperature more efficiently.
Reduces Outside Noise
Sealed glazing units and well-fitted frames help reduce external noise penetration, improving comfort in homes near roads, schools or busy areas.
Improves Home Security
Modern double-glazed windows can incorporate secure frames, multipoint locking systems and reinforced glazing options to improve resistance against unwanted access.
Helps Reduce Condensation
Improved insulation keeps the internal glass surface warmer, helping reduce the likelihood of condensation forming compared with older single glazing.
Creates More Comfortable Living Spaces
Better insulation, reduced draughts and improved glazing performance help maintain more consistent temperatures throughout the home 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.
- Book Your Free Consultation
- Receive Your No-obligation Quote
- Proceed To Installation
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
Brilliant Service from Leon,Jack and Barry when they fitted my new front door. They were so helpful explaining the new lock and I am delighted with my door. My neighbours have commented on how nice it looks. A big “ thank you “ to the whole team at Bowalker Windows from sales to completion I have been very impressed and would certainly recommend this company to family and friends .
We have had a front door and side panel installed,Team Tim did a great job and were very professional and knowledgeable. Wouldn’t hesitate to recommend the company and this team to any one !
Simon and Brandon fitted our three windows in our garage > studio conversion and were great through the day. Arrived when they said they would, were very polite, respectful and pleasant people. Found answers to questions we didn’t realise about the installation and though we haven’t yet finished the project the windows are a very exciting and big step forward for us. Would recommend this company and this team without hesitation. Thank you!
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
Excellent service from a local independent company. Highly recommend.
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.
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
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
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
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.
Zack Newman
Director
Anthony Bowyer
Senior Surveyor
Dean Lloyd
Operations Manager
Angela Georgant
Financial Controller
Jack Harsford
Installer
Leon Prichard
Installer
Tim Cooper
Installer
Lloyd Walker
Installer
Tim Fraser
Installer
Brandon Bowyer
Installer
Zack Newman
Director
Anthony Bowyer
Senior Surveyor
Dean Lloyd
Operations Manager
Angela Georgant
Financial Controller
Jack Harsford
Installer
Leon Prichard
Installer
Tim Cooper
Installer
Lloyd Walker
Installer
Tim Fraser
Installer
Brandon Bowyer
Installer
See Our Work In Action
- Doors
- Rooflight
- Doors
- Windows
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 Bowalker Double-Glazed windows