Transform Your Home with Premium Sash Windows

Upgrade your home with premium sash windows, expertly measured and fitted by Bowalker’s in-house team. Every installation is carried out to FENSA standards (reg. 33081), with no subcontractors involved at any stage. A 10-year insurance-backed guarantee covers all our work 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 Sash Window Installation And Replacement Services

As a reliable sash window installer founded in 2009, Bowalker provides premium sash window installation and replacement services for homeowners seeking traditional styling that enhances energy efficiency, ventilation and interior comfort. Our in-house window installers measure, supply and install a wide range of modern sash windows, including Victorian, Georgian, Edwardian and sliding sash window designs.

Our professional window installation service supports properties fitted with timber, uPVC and bespoke sash windows, using durable glazing options such as double glazing and high-performance acoustic glass. Each installation is carefully planned to meet the applicable building regulations and specifications, covering thermal efficiency, draught-proofing and secure structural fitting, so that insulation is improved and comfort kept consistent throughout the home.

Call Bowalker on 01444 810 111 to arrange your consultation and receive guidance on your sash window installation. From the initial measurement and design advice through to precise fitting and final inspection, our in-house installers deliver a reliable, end-to-end service backed by FENSA-registered compliance (33081) and a 10-year insurance-backed guarantee.

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 Sash Window Installation Services?

Homeowners choose Bowalker for the quality of our workmanship, a luxurious yet hassle-free full-service process and a team they can rely on from start to finish. Founded in 2009, we have built our reputation on a 10-year insurance-backed guarantee, our FENSA registration (33081) and a fully in-house team of installers responsible for every fitting. Our mission is to make your property warm, dry, safe and stylish, and our values ensure we complete each installation properly, keep things easy at every stage and stand by our customers from consultation to completion.

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 Sash Windows We Install And Replace

A single-hung sash window features a fixed top sash and a movable bottom sash that slides vertically to provide ventilation. This design offers a classic aesthetic with fewer moving parts, making it a cost-effective and low-maintenance option for residential properties.

Bowalker installs single-hung windows in uPVC and timber frames, utilising high-quality seals to ensure excellent weather resistance. They are best used in ground-floor rooms or areas where simple vertical operation is preferred.

Georgian sash windows are characterised by their six-over-six-pane configuration, with small glass panes separated by delicate glazing bars. This style is essential for maintaining the symmetry and authentic character of 18th-century properties.

We provide these window installations with modern double glazing that mimics the traditional slim profile while providing superior insulation. Georgian sash windows are the ideal choice for heritage restorations in Sussex and London, where architectural accuracy is paramount.

Victorian sash windows feature a two-over-two pane design, often incorporating decorative sash horns to support the heavier glass sheets popularised in the 19th century. Our sash window installation team fits these windows with high-performance balances and ornate hardware to preserve their grand, historic appearance.

These types of sash windows are best suited to period Victorian terraces, enhancing kerb appeal and property value while eliminating the draughts associated with original single-glazed units.

In a double-hung sash window, both the top and bottom sashes are functional and slide vertically, allowing for superior airflow as warm air escapes through the top while cool air enters through the bottom. Bowalker installs these with smooth-operating pulley systems or modern spiral balances for effortless use.

Key benefits of double-hung sash windows include maximum ventilation control and easier cleaning, making them a versatile choice for any room in the home.

Often referred to as Yorkshire Sliders, horizontal sliding sash windows feature sashes that slide side-to-side rather than up and down. This unique configuration is perfect for rooms with limited vertical space or where a traditional opening would be obstructed.

We install this type of sash window using precision-engineered tracks and slimline frames to ensure a smooth, quiet operation. Compared with other types of sash windows, horizontal sliding sash windows offer a distinctive look and are particularly well-suited to rural cottages and barn conversions.

Edwardian sash windows often utilise a six-over-one design, featuring multiple small panes in the upper sash and a single large pane in the lower sash to maximise natural light. This transitional style bridges the gap between decorative Georgian patterns and modern glass spans.

Our in-house sash window installers deliver these with bespoke timber or uPVC finishes that respect the Edwardian emphasis on light and air. They are best used in early 20th-century homes to restore original elegance.

Crafted from high-quality hardwoods or engineered softwoods, traditional timber sash windows offer unmatched natural beauty and high thermal mass. We install these with traditionally joined frames and high-performance stains that protect against rot and warping.

Benefits of traditional timber sash windows include a lifespan of over 60 years with proper care and the ability to be refinished in any colour, making them the gold standard for luxury homes and listed buildings.

uPVC sash windows provide the classic look of timber with the benefits of modern, low-maintenance materials. Bowalker installs these with woodgrain foils and authentic mechanical joints to ensure they are virtually indistinguishable from real wood.

Key features of uPVC sash windows include multi-chambered profiles for excellent energy ratings, tilt-to-clean functionality and resistance to fading or peeling, offering exceptional value for modern British homeowners.

Flush sash windows feature sashes that sit level with the external frame when closed, creating a clean, flat surface that mimics traditional 19th-century timber casements. Our sash window installers fit these with sleek hardware and high-security multi-point locks.

They are widely used in conservation areas where a minimalist, authentic appearance is required without sacrificing the high-performance benefits of modern glazing.

Spiral balance sash windows replace traditional weights and pulleys with a modern spring-loaded mechanism hidden within the frame. This allows for slimmer window profiles and a smoother opening action, suitable for both new builds and retrofits.

We install these systems to provide a reliable, quiet vertical slide that requires minimal maintenance over time. Spiral balance sash windows are an excellent solution for homeowners who want a classic look with updated mechanical performance.

A box sash window utilises the traditional weight-and-pulley system housed within boxes on either side of the frame to counterbalance the sashes. Compared with other sash window construction methods, this is the most authentic for historic window replacement, providing a heavy, solid feel.

Bowalker installs these using lead weights and durable nylon cords or brass chains, ensuring the windows operate with the same grace and reliability as they did a century ago.

Thin mid rail sliding windows feature a reduced central meeting rail, creating slimmer sightlines and maximising natural light. This design helps maintain an authentic period appearance without the bulk of standard modern frames.

Bowalker installs this type of sash window with reinforced internal structures to ensure strength, security and smooth operation. They are suited to smaller rooms or properties where increased light and a refined aesthetic are desired.

Featuring a wider bottom rail on the lower sash, deep base rail sliding windows replicate the proportions of traditional 19th-century timber designs. This deeper rail adds a strong, authentic visual weight while maintaining modern performance standards.

We install this type of sash window with durable materials and precision engineering to ensure long-lasting operation. They are ideal for ground-floor settings or period properties where a convincing heritage appearance is essential.

Wood-look vertical sliders replicate the natural texture of timber while offering the durability of modern uPVC or composite materials. They feature realistic wood-effect finishes and mechanical joints that allow the corners to meet cleanly at 90 degrees, as in traditional joinery.

This makes them ideal for homeowners who want the look of real timber without the upkeep. Bowalker installs these with authentic hardware and smooth-sliding mechanisms for reliable performance.

Woodgrain sliding windows feature textured finishes that mimic natural wood patterns, available in tones such as oak, rosewood and walnut. They combine the warmth of timber aesthetics with the durability and low maintenance of uPVC or aluminium.

Our installations include energy-efficient glazing, multi-chambered profiles and weather-resistant seals. These windows are well-suited to both contemporary homes and period-style renovations requiring a natural finish.

Offering dual finishes on the interior and exterior, dual colour vertical sliders allow homeowners to coordinate indoor décor while preserving a suitable external appearance. For example, a white interior can be paired with a heritage shade for the exterior.

Bowalker installs these using advanced colour bonding for long-lasting resistance to fading or peeling. They are a popular choice for conservation areas and modern developments where design flexibility is essential.

Bowalker Windows installs and replaces Roseview sash windows, one of the UK's most authentic uPVC vertical sliders. Featuring the award-winning Ultimate Rose with its distinctive 35mm mid-rail, seamless run-through horns and joinery-style mechanical joints, these windows are virtually indistinguishable from traditional timber.

A-rated for thermal efficiency with U-values as low as 1.2 W/m²K, our window installers ensure every installation meets conservation standards while delivering lasting acoustic comfort and draught-free performance.

For homeowners seeking a proven, high-performance sash window, Bowalker Windows supplies and fits the full Quickslide Legacy range. Manufactured to order in West Yorkshire, these uPVC vertical sliders feature a slim 37mm mid-rail, deep bottom rail, run-through sash horns and optional 90-degree mechanical joints for maximum authenticity.

Bowalker handles every sash window installation with precision, ensuring argon-filled glazing and multi-chambered frames work together to deliver consistent thermal performance throughout the year.

We provide installation and replacement services for Allan Brothers sash windows, part of the Inwido UK brand portfolio alongside CWG Choices. Known for over 200 years of British timber craftsmanship, they offer bespoke Redwood sash windows featuring a 40mm mid-rail, hand-applied 9mm external beading and cord-and-weight opening systems.

With Secured by Design accreditation and a 60-year service life, Bowalker ensures each installation preserves character while meeting current building regulations.

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See Our Work In Action

What Are the Benefits of Installing Sash Windows?

Installing sash windows improves energy efficiency, increases property value, provides better ventilation, reduces noise and enhances your property’s security. Upgrading to modern double-glazed sash windows with durable window frames, draught-proofing and high-performance glazing reduces heat loss, improves insulation and protects your home from external noise, weather exposure and air leakage.

Seven key benefits of sash window installation are:

Enhances Energy Efficiency

New, well-fitted sash windows, particularly those with high-performance double glazing, provide superior insulation, preventing draughts and stabilising indoor temperatures.

Increases Property Value

High-quality sash window installations are a significant asset, particularly in heritage or conservation areas, making the home more attractive to premium buyers.

Provides Better Ventilation

The dual-sliding nature of double-hung sash windows allows for superior airflow, reducing humidity and maintaining a stable, fresh indoor environment.

Durable and Sustainable

Modern sash windows utilise treated engineered timber or high-grade uPVC that resists weathering, rot and corrosion, ensuring a long-lasting, eco-friendly lifespan.

Enhances Aesthetic Appeal

Classic sash styles, whether in traditional timber or authentic uPVC, enhance the property's visual appearance and preserve its historic architectural character.

Reduces Noise

Double- or triple-glazed sash window panels help minimise external noise from traffic, busy streets, or neighbouring properties, creating a quieter living space.

Improves Security

Reinforced window frames, multi-point locking systems, and toughened safety glass provide stronger protection against forced entry compared to older, single-glazed units.

How To Get Started With Window Installation At Bowalker?

Starting your sash window installation project with Bowalker is simple and structured, allowing homeowners to book a consultation, receive a clear no-obligation quote and proceed with professional installation. Our window installers guide you through each stage of the process, beginning with a property assessment to determine and recommend the most suitable sash window for your style, energy efficiency and security needs.

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Areas we Serve

Bowalker provides professional sash window installation services across Sussex, Surrey and London, delivering high-quality, premium windows with precision and care. Our team ensures consistent workmanship, reliable installation and continuous support for homeowners throughout these regions.

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

Sash Windows Project Gallery

Two anthracite sash windows in Hassocks

Ready To Get Started With Bowalker Windows?

Choosing the right sash windows can transform your home’s comfort, energy efficiency and appearance, making it warmer, quieter and more stylish. Bowalker Windows Limited provides a full-service, hassle-free installation with a fully in-house team of window installers, premium quality glazing systems and a 10-year insurance-backed guarantee to ensure long-term reliability and performance.

Call Bowalker on 01444 810 111 today to book your free sash window consultation and receive a no-obligation quote. Our experienced sash window installation team will handle every step of the sash window installation with precision and care, ensuring your sash windows are fitted perfectly for long-lasting performance.

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 Sash Windows?

A sash window is a traditional window system that uses one or more movable panels, known as sashes, which slide vertically or horizontally within a frame. These windows feature glazing bars, timber or uPVC frames and balanced mechanisms that allow smooth operation. Bowalker installs sash windows with modern upgrades such as double glazing, draught-proofing and secure locking systems, combining traditional style with improved thermal efficiency and functionality.

How Much Does Sash Window Installation Cost?

Sash window installation costs range from £500 to £2,000 per window across the UK, with uPVC at the lower end (around £500–£1,200) and timber at the higher end (£1,500–£3,500, or more for hardwood and heritage designs). Labour alone is quoted at £200–£450 per window.

At Bowalker, sash window installation starts from around £1,300 per window, supplied and fitted, and falls between £1,300 and £3,000 depending on the material, opening size, glazing specification and range. Our fixed fitting rate of £225 per window includes VAT, surveying, old window disposal and the 10-year insurance-backed guarantee. We confirm the exact figure at your free survey, and the price we quote is the price you pay.

What Materials Are Sash Windows Made From?

Sash windows are made from materials such as timber, uPVC and aluminium. Timber sash windows use hardwood or engineered softwood to preserve traditional style and durability, while uPVC sash window systems provide a low-maintenance and cost-effective alternative. Aluminium frames offer a modern solution with high strength and slim profiles.

How Long Does Sash Window Installation Take?

Sash window installation takes 1 to 2 hours per window, while installing 6 to 8 sash windows can take at least 1 full day, depending on project scope and property conditions. The total installation time for sash windows varies based on factors such as the number of windows, the type of installation (full replacement or refurbishment), the property’s structure (including older or listed buildings), bespoke manufacturing requirements and site access conditions.

What Guarantee Do You Provide on Sash Window Installation?

We provide a 10-year insurance-backed guarantee on all sash window installations, ensuring peace of mind and long-lasting performance. This covers workmanship and installation quality, giving homeowners confidence that their sash 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 at home for the sash window installation as long as we have access to the property and your preferences are communicated in advance. Our fully in-house team of window installers will carry out the work professionally, ensuring security, careful handling and adherence to your specifications.

How Much Does It Cost to Replace Sash Windows?

Sash window replacement in the UK costs between £500 and £1,200 per window for uPVC, rising to £1,500–£3,500 for hardwood and heritage timber. Where original frames are sound, repair or restoration is sometimes possible for £150–£800 per window.

At Bowalker, replacement starts from £1,300 per window, supplied and fitted, with our fixed £225 fitting rate covering removal and disposal, surveying and the 10-year insurance-backed guarantee. The final price is determined by material, size, glazing and any building-regulations requirements for older or listed properties.

Sash Windows

Transform Your Home with Premium Sash Windows

Professional Sash Window Installation And Replacement Services

Materials

Standard Hardware

Standard Colours

Glass

Standard Layouts

Our Certifications And Professional Standards

Why Homeowners Choose Bowalker For Sash Window Installation Services?

Types of Sash Windows We Install And Replace

Single-Hung Sash Windows

Georgian Sash Windows

Victorian Sash Windows

Double-Hung Sash Windows

Horizontal Sliding Sash Windows

Edwardian Sash Windows

Traditional Timber Sash Windows

uPVC Sash Windows

Flush Sash Windows

Spiral Balance Sash Windows

Box Sash Windows

Thin Mid Rail Sliding Windows

Deep Base Rail Sliding Windows

Wood Look Vertical Sliders

Woodgrain Sliding Windows

Dual Colour Vertical Sliders

Roseview Windows

Quickslide Windows

Allan Brothers Windows