Upgrade Your Home with Premium Secondary Glazing

Upgrade your home with premium secondary glazing from Bowalker, professionally measured and fitted by our dedicated in-house team. Every system is installed with precision for improved insulation and reduced outside noise, backed by FENSA registration (33081) and a 10-year insurance-backed guarantee for lasting reassurance.

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

Professional Secondary Glazing Installation and Replacement Services

As a leading secondary glazing installer founded in 2009, Bowalker is an established secondary glazing installer providing installation and replacement services for homeowners seeking glazing solutions that improve thermal efficiency, reduce outside noise and create a more comfortable living environment. Our in-house glazing installers measure, install and replace bespoke secondary glazing systems, including Fixed, Lift-out, Hinged, Horizontal Sliding, Vertical Sliding, Magnetic, Acoustic and Low-E Secondary Glazing, ensuring each installation complements the property’s architectural style and glazing requirements.

Our services cover bespoke glazing systems, slimline panels and energy-efficient glass, using durable materials and thermally insulated glazing solutions to reduce heat loss and external noise. Each replacement unit is carefully designed with secure fixings and long-lasting frames to ensure reliable performance over time.

Call Bowalker at 01444 810 111 to arrange your free consultation for secondary glazing installation and replacement services. From measurement to secondary glazing fitting and final inspection, our professional glazing installers deliver a reliable service, supported by FENSA-registered compliance (33081) and a 10-year guarantee.

Materials

Timber
uPVC

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 Secondary Glazing Installation Services?

Homeowners choose Bowalker for secondary glazing installation because of our fully in-house team, transparent fixed pricing and a smooth, hassle-free process from first consultation through to final inspection. Founded in 2009, we have built a trusted reputation on reliable workmanship, FENSA-registered compliance (33081) and a 10-year insurance-backed guarantee, ensuring consistent standards and complete accountability at every stage of 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 Secondary Glazing We Install and Replace

Fixed secondary glazing is the most thermally efficient option in our range, as the sealed panel creates an unbroken insulating barrier with no moving parts or gap-prone mechanisms.

Well suited to north-facing rooms, hallways and ground-floor windows in listed buildings or conservation areas, each unit is built with slimline aluminium frames, energy-efficient glass and fitted internally by our in-house team to complement the existing window surround. It is also among the most cost-effective systems we offer for heat retention and draught reduction.

Lift-out secondary glazing uses a panel that sits within the window reveal and can be removed by hand, making it a practical choice for homeowners who want the flexibility to take the glazing down during warmer months or for easy cleaning.

It is popular in traditional homes and period properties where a permanent fixture is not desirable, and in rooms where occasional full access to the window opening is needed. Our installers fit each panel with energy-efficient glass and slimline aluminium frames, ensuring a secure, draught-resistant fit when in place and straightforward removal when required.

Hinged secondary glazing features a panel that swings open on side or top hinges, allowing straightforward access to the original window for ventilation or cleaning.

It is a versatile option for bedrooms and living rooms where the window is opened regularly, as the panel can be pulled open quickly and secured flat against the wall or reveal. Side-hinged units suit standard casement windows, while top-hinged panels suit windows with restricted floor clearance. Each system uses energy-efficient glass and slimline aluminium frames for effective thermal insulation and noise reduction when closed.

Horizontal sliding secondary glazing features panels that slide side to side along a track, making it a practical solution for wide window openings such as those found in bay windows, living rooms and open-plan extensions.

The sliding mechanism allows easy access to the original window for ventilation without the panel obstructing the room. Fitted with reinforced sliding tracks, energy-efficient glass and durable aluminium frames, horizontal sliding secondary glazing provides reliable thermal insulation, effective noise reduction and smooth everyday operation in both modern and traditionally styled properties.

Designed to replicate the movement of traditional sash windows, vertical sliding secondary glazing features panels that raise and lower within the window reveal.

It is the preferred choice for period properties, Georgian and Victorian terraces and conservation area homes where the appearance of the original sash window must be maintained. Panels slide in separate channels, allowing independent ventilation through either section. Our installers fit each system with energy-efficient glass, durable aluminium frames and balanced sliding mechanisms for reliable everyday use and a sympathetic finish.

Using a flexible magnetic strip fixed to the window reveal, magnetic secondary glazing allows the glazing panel to be attached and removed quickly without tools or fixings.

The most straightforward system to take down for cleaning or seasonal use, it is especially well suited to irregularly shaped openings, arched windows and listed building interiors where drilling into surrounds is not permitted. Our installers fit each panel with energy-efficient glass and a precision-cut frame for a draught-resistant seal and discreet finish.

We install acoustic secondary glazing using laminated glass with a specialist interlayer that absorbs sound energy, significantly reducing external noise transmission compared to standard glazing.

Particularly suited to properties near busy roads, railway lines, flight paths and urban centres, each system is fitted with durable aluminium frames, secure glazing mechanisms and condensation-resistant finishes. When combined with the existing primary window, acoustic secondary glazing achieves substantial reductions in perceived noise levels, creating a noticeably quieter interior environment with long-term thermal performance.

Fitted with a microscopic metallic coating on the glass surface, Low-E secondary glazing reflects radiant heat back into the room during winter while limiting solar heat gain in summer.

The result is a more stable internal temperature throughout the year and reduced reliance on heating and cooling. Particularly effective in rooms with large window areas, each unit is fitted with slimline aluminium frames, secure glazing mechanisms and condensation-resistant finishes for reliable long-term thermal performance in both modern and period properties..

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 Secondary Windows?

Installing secondary glazing improves thermal efficiency, reduces outside noise, strengthens window security and provides a cost-effective alternative to full window replacement, all without altering the appearance of existing windows. Modern secondary glazing systems use slimline glazing panels, energy-efficient glass and secure fitting systems to reduce draughts, minimise condensation and preserve the appearance of existing windows in both traditional and contemporary properties.

Reduces External Noise

Acoustic glazing panels and insulated secondary glazing systems help minimise external noise from roads, railways and busy urban environments.

Improves Thermal Efficiency

Energy-efficient glazing and insulated secondary glazing panels help reduce heat loss and maintain comfortable indoor temperatures throughout the year.

Cuts Draughts and Condensation

Creates an additional insulating barrier that helps reduce cold draughts and condensation build-up around existing windows.

Preserves Original Windows and Period Character

Secondary glazing maintains the appearance of original timber windows and traditional property features without major structural alterations.

Offers a Cost-Effective, Reversible and Fully Removable

Provides improved insulation and noise reduction while allowing future removal without damaging existing windows.

Strengthens Window Security

Secure glazing systems and reinforced secondary glazing panels provide an additional internal barrier that must be breached separately from the outer window.

How to Get Started With Secondary Glazing Installation and Replacement at Bowalker?

Getting started with secondary glazing installation and replacement at Bowalker begins by booking your free consultation, during which our glazing specialists will assess your property and recommend the most suitable system. We will then provide a no-obligation quote before proceeding to installation at a time that suits you. Each installation is tailored to complement your property’s appearance while improving thermal efficiency, noise reduction, interior comfort and everyday functionality.

Get In Touch

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Areas We Serve

Bowalker provides professional secondary glazing installation and replacement services across Sussex, Surrey and London, delivering high-quality secondary glazing systems with precision and care. Our skilled glazing installers ensure reliable workmanship, accurate fitting and continuous support for homeowners seeking energy-efficient, noise-reducing and visually discreet secondary glazing solutions throughout these regions.

What Our Happy Customers Say

EXCELLENT

Based on 36 reviews

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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 fully employed, in-house glazing installers, each trained to install the full range of secondary glazing systems we offer. We do not use subcontractors at any stage, which means the same standard of workmanship applies to every job, from a single window in a period cottage to a multi-room installation in a large residential property. Every installer works to FENSA compliance standards and is fully briefed on our 10-year guarantee commitments.

Secondary glazing Windows Project Gallery

Two anthracite sash windows in Hassocks

Ready to Upgrade Your Home with Bowalker Secondary Glazing?

Improving your home with secondary glazing improves thermal efficiency, reduces outside noise and creates a quieter, more comfortable living environment with reliable insulation and low-maintenance performance. Bowalker provides a full-service, hassle-free installation experience with a fully in-house team of glazing installers, premium secondary glazing systems and a 10-year insurance-backed guarantee, ensuring dependable quality and professional workmanship.

Call on 01444 810 111 today to book your free secondary glazing consultation and receive a no-obligation quote. Our experienced secondary glazing specialists oversee each stage of the installation and replacement process, ensuring every glazing system is accurately fitted to improve thermal insulation, reduce outside noise and complement the architectural 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 Is Secondary Glazing?

Secondary glazing involves installing a separate internal glass or plastic panel behind existing windows to create an additional insulating barrier. This glazing system delivers a double-glazed effect without replacing or altering the original windows and is commonly used to improve thermal insulation, reduce outside noise and minimise draughts.

What Homes Are Suitable for Secondary Glazing?

Secondary glazing is well suited for listed buildings, conservation area properties and older homes with single-pane windows where preserving the original window appearance is important. It is also suitable for properties in noisy urban locations and for homeowners seeking a cost-effective solution to reduce draughts, improve insulation and minimise outside noise without replacing existing historic window frames.

Is Secondary Glazing Fitted Inside or Outside the Window?

Secondary glazing is fitted inside the window, with a separate glass or acrylic panel installed on the interior side of the existing window frame. This internal glazing system creates an additional insulating barrier without replacing or altering the original external windows, making it suitable for period properties, listed buildings and homes requiring improved thermal efficiency and noise reduction.

How Much Does Secondary Glazing Installation Cost?

Secondary glazing installation costs between £300 and £800 or more, depending on the window size, glazing style, material specification and installation requirements. Acoustic glass, Low-E coatings and bespoke configurations will increase the overall cost.

How Long Does Secondary Glazing Installation Take?

Secondary glazing installation takes between a few hours and 1 to 2 days, depending on the number of windows, glazing style and property requirements. Standard secondary glazing installations for single rooms are often completed within one day, while bespoke glazing systems, larger properties and complex window configurations require additional installation time.

Is Secondary Glazing Suitable for Listed Buildings?

Yes, secondary glazing is suitable for listed buildings because it provides improved insulation and noise reduction without replacing or altering the original historic windows. As the glazing system is fully reversible and fitted internally, it helps preserve the property’s traditional appearance while meeting conservation requirements.

What Guarantee Do You Provide on Secondary Glazing Installation?

Bowalker provides a 10-year insurance-backed guarantee on secondary glazing installation and replacement services, covering installation workmanship and fitting quality for added peace of mind. Our secondary glazing installations are completed by a fully in-house team of glazing installers and supported by FENSA-registered compliance standards to ensure accurate fitting, improved insulation performance and long-term reliability.

Do I Need to Be at Home During the Installation?

You are welcome to be present during installation, though it is not required. As long as access and any specific preferences are agreed beforehand, our team will complete the work professionally and leave the property tidy.

How Much Does It Cost to Replace Secondary Glazing?

The cost to replace secondary glazing ranges from £200 to £500+ per window, depending on the glazing style, window size, glass specification and installation requirements. Acoustic glazing, bespoke glazing systems and larger window configurations increase the overall replacement cost due to additional materials and fitting complexity.

What Are the Maintenance Tips for Secondary Glazing?

Maintenance tips for secondary glazing include cleaning glazing panels with mild soapy water, lubricating sliding tracks, checking weather seals regularly and maintaining proper ventilation to reduce condensation build-up. Regular maintenance also helps preserve thermal efficiency, smooth glazing operation and long-term performance.