sash-windows

Description

Transform Your Home with Premium Sash Windows

Get luxury, premium sash window installation from Bowalker Windows Limited, delivered by a fully in-house team of certified window installers who measure, fit, and secure every window with precision. Our FENSA-registered (33081+) compliance and 10-year insurance-backed guarantee provide clear assurance of quality and reliability.

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

Professional Sash Windows Installation & Replacement Services

As a reliable sash window installer founded in 2009, Bowalker provides premium sash window installation and replacement services for homeowners seeking traditional aesthetic solutions that enhance energy efficiency, ventilation, and interior comfort. Our certified 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 with timber, uPVC, and bespoke sash windows, using durable glazing options such as double-glazing and high-performance acoustic glass. Each sash window installation is carefully planned to meet applicable building regulations and sash window specifications, including thermal efficiency, draught-proofing, and secure structural fitting, thereby improving insulation performance and maintaining consistent comfort throughout the home.

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

Materials

Standard Hardware

Standard Colours

Glass

Standard Layouts

Featured partners

Why Do Homeowners Choose Bowalker For Sash Windows Installation Services?

Homeowners choose Bowalker for sash window installation services to receive quality and premium workmanship, benefit from a luxury yet hassle-free full-service process, and rely on certified sash window installers. Founded in 2009, we have built our reputation on our USP of a 10-year insurance-backed guarantee, our FENSA Reg: 33081 certification, and a fully in-house team of window installers responsible for every fitting. Our mission is to make your property warm, dry, safe, and stylish, and our values ensure we complete each window installation properly, provide ease at every stage, and stand by our customers from consultation through 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 Windows We Install

A sash window uses one or more framed panels that slide vertically within the frame. Common styles include double-hung, single-hung, and box sash, suitable for both traditional and modern properties. We install sash windows in timber, aluminium, and PVCu, with double glazing, tight seals, and secure locking to improve energy efficiency, security, and airflow. Key benefits include smooth operation, durable build quality, low-maintenance options like PVCu, and insulated glazing that supports airtight, long-term performance.

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and surrounding Central Texas communities.Dagwood Properties helps renters compare homes based on budget, property size, commute preferences, school districts, and neighborhood goals so the selected property supports both immediate living needs and long-term lifestyle plans.

A flush window features a flat sash that sits level within the frame, creating a clean, seamless exterior with minimalist lines. We install flush windows in uPVC, aluminium, and timber, with double glazing, airtight seals, secure locking, and energy ratings up to A++ to improve efficiency, security, and weather resistance while retaining a traditional look where required. Key features include a slim flat profile, smooth ventilation through opening panels, low-maintenance options such as uPVC, and insulated glazing that supports airtight, long-term performance.

A heritage window follows a traditional design that reflects the appearance of 19th- and early 20th-century windows while integrating modern security and energy-efficiency features. We install heritage windows in timber, aluminium, and high-end uPVC, with realistic woodgrain finishes, period-accurate proportions, traditional detailing, double glazing, airtight seals, and secure locking. Key features include strong energy efficiency, improved insulation, low-maintenance modern materials, and durable construction that preserves architectural character while delivering long-term performance.

A bay window is a multi-pane window that projects outward in a trapezoidal form, with a fixed center pane and two angled or opening side panels. We install canted bay, box bay, and oriel styles in timber, aluminium, and uPVC, using double glazing, airtight seals, and secure locks for strong thermal and long-term performance. Key benefits include wider views, effective airflow through the side panels, space for seating or reading corners, and a layout that brightens rooms while giving a greater sense of space.

An arched window is a custom-made window with a rounded, curved, or pointed top that adds architectural character while drawing in more natural light. Styles include full semi-circle Roman arches, shallow segmental curves, and sharp Gothic lancet forms, suited to both classic and modern buildings. We produce these windows in aluminium for strength and long service life, as well as timber and PVC, integrating double glazing, airtight sealing, and secure hardware, with optional opening sections for controlled ventilation.

A fixed window is a non-operable, fully sealed window designed to maximise natural light and provide clear, uninterrupted views. We install direct-set windows, in which the glass is glazed directly into the frame, and sash-set designs, in which the glass sits within a fixed sash, both without hinges, handles, or ventilation. Key benefits include strong airtightness, reduced heat loss, lower energy costs, minimal maintenance, and durable double glazing for long-term thermal performance.

A cottage window is a traditional style often seen as a casement or vertically sliding sash, with multiple panes divided by astragal bars. Our design variations follow a double-hung format that reflects historic glazing while giving homes a warm, classic appearance. Key benefits include modern double glazing for good thermal performance, effective airflow in opening versions, and durable construction that retains traditional character while reducing upkeep in uPVC or aluminium.

A historic window is designed to protect the architectural and heritage value of older buildings by replicating traditional construction methods. Our windows often feature small panes, mortise-and-tenon joints, sash horns, and putty-glazed glass, typically crafted in timber to match original details. Key benefits include authentic appearance, improved thermal performance through discreet double glazing, and secure hardware that supports long service life while respecting the original design.

A tilt-and-turn window operates on a dual-hinge mechanism that opens along two axes, allowing the sash to tilt from the top for secure, draft-free ventilation or swing fully inward from the side for easy cleaning and maximum airflow. Our tilt-and-turn windows suit upper floors and high-rise buildings where outside access is limited. Key benefits include multi-point locking for security, tight seals that reduce draughts and heat loss, and durable double glazing for dependable energy performance.

A casement window is attached to its frame by one or more vertical hinges on the side, allowing it to swing outward like a door for effective ventilation and airflow. Available in uPVC, timber, and aluminium, we install single or double-panel windows that offer unobstructed views and maximum natural light. Key features include a multi-point locking system for security, durable construction, and secure sealing to reduce heat loss. We design and install each window to deliver long-lasting, energy-efficient performance across our range.

We install bifold windows with multiple panels that fold and stack in a concertina style to one or both sides, sliding smoothly along a track to create a wide opening. Our bifold windows are made from durable materials such as aluminium or uPVC, with ultra-slim frames, toughened glass, multi-point locking systems, and child-safe gaskets to reduce the risk of finger trapping. Key features include increased natural light and ventilation, secure operation, strong durability, and energy-efficient double glazing for long-term performance.

A replacement sash window upgrades existing sash units with modern double-glazed panels while retaining the property’s period style. We carefully fit new units into the original framework to improve insulation, reduce draughts and rattles, and strengthen security without the cost or disruption of a full-frame replacement. Our replacement sash windows deliver improved energy efficiency, smoother vertical sliding action, reduced outside noise, and low maintenance, all in durable materials such as uPVC or aluminium.

Inspired by 1920s Art Deco and industrial design, a Crittall-style window reflects the look of original steel glazing with ultra-slim frames, large glass panes, and bold black grid lines. We manufacture and install these windows in durable aluminium or uPVC, making them suitable for heritage renovations, new builds, and extensions. Our Crittall-style windows combine high-performance glazing, multi-point locking for security, low-maintenance construction, and a clean design that increases natural light and supports strong energy performance.

Our double-glazed windows feature two glass panes separated by a sealed air or gas-filled cavity to reduce heat transfer, improve insulation, and cut outside noise. We fit them with Low-E glass and advanced spacers to limit condensation and energy loss. Available in uPVC, aluminium, and timber, our windows include secure multi-point locking and airtight seals. Benefits include stronger thermal performance, lower energy bills, increased natural light, and durable, low-maintenance construction.

We install triple-glazed windows with three glass panes separated by two sealed gas-filled cavities to deliver maximum thermal efficiency. Our systems reduce heat loss, outside noise, and condensation, offering up to 50% better insulation, A++ energy ratings, and strengthened security. Available in uPVC, aluminium, and timber, our windows include airtight seals and multi-point locking. Benefits include superior thermal performance, lower energy bills, increased natural light, and durable, low-maintenance protection.

Obscure windows allow natural light to filter through while distorting the view from either side to ensure privacy. They serve as a decorative feature, limiting visibility while still transmitting light, reducing transparency, and distorting or blocking vision through the pane. We offer them in uPVC, aluminium, and timber, with durable frames, airtight seals, and secure glazing for improved insulation, energy efficiency, and long-lasting, low-maintenance performance.

We install astragal bars windows featuring decorative, raised, and fitted strips, usually in PVC, wood, or metal, that mimic the look of traditional small-paned Georgian windows. Our windows divide the glass into multiple panes, providing a slightly more robust feel than thin, internal-only Georgian bars, while enhancing the aesthetics of your property. They are available in uPVC, aluminium, and timber, with durable frames, airtight seals, and secure glazing for improved insulation, energy efficiency, and long-lasting, low-maintenance performance.

Satin windows feature a velvety frosted finish that provides Level 5 privacy while letting natural light through. Ideal for bathrooms, front doors, and partitions, they create a soft, diffused glow and can be toughened, cut to size, and fitted into double-glazed units. Our satin windows use durable frames with airtight seals and secure glazing for energy efficiency, long-lasting performance, and low maintenance.

Leaded windows feature small panes of glass held together with lead cames, creating intricate patterns that enhance the character and elegance of a property. We install leaded windows in timber, aluminium, and uPVC, using durable frames and secure glazing to improve insulation, energy efficiency, and long-lasting performance. The best features include decorative detailing, a traditional or period aesthetic, enhanced security, and low-maintenance construction that preserves your home’s architectural charm.

Georgian bars windows feature decorative, narrow strips installed on top of the glass that divide a single pane into smaller, classic panes, echoing 18th-century design and making them look like traditional Georgian-style windows. We install them in timber, aluminium, and uPVC, set inside the sealed unit to offer improved insulation, airtight seals, and secure glazing for energy efficiency and long-lasting performance. They combine authentic period style with practical benefits such as improved security, energy efficiency, and easy upkeep.

uPVC windows are a low-maintenance, energy-efficient alternative to wood or aluminium, offering excellent insulation, weather resistance, and security. We install them with a galvanised steel core for enhanced strength, airtight seals, and double-glazed units, providing cost-effective durability and improved thermal performance. The best features include resistance to rot, corrosion, rust, and distortion, a lifespan often exceeding 25–35 years, and a clean, versatile design suitable for a wide range of properties.

Wooden windows provide a classic, premium aesthetic while offering excellent insulation, energy efficiency, and durability. We install them using high-quality timber with airtight seals and double-glazed units, ensuring strong weather resistance, security, and long-lasting performance. With proper care, they provide natural warmth, timeless elegance, outstanding performance, and a lifespan that can exceed 60 years.

Aluminium windows provide a sleek, modern, and durable solution for homes and commercial properties, combining low maintenance with strong energy efficiency. We install them with airtight seals, double-glazed units, and reinforced frames to ensure excellent insulation, weather resistance, and security. They combine modern design, exceptional thermal performance, robust security, and a lifespan exceeding 45 years with minimal maintenance.

Timber windows provide a classic, warm, and premium look while offering durable, energy-efficient performance. We install them using hardwoods like Oak or Sapele, softwoods like Pine, or premium options like Accoya, with airtight seals and double-glazed units to prevent rot, weathering. and heat loss. They deliver lasting natural beauty, timeless character, high thermal efficiency, and a lifespan of 45+ years with proper care.

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 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.

Enhances Energy Efficiency

New, well-fitted sash windows, particularly those with high-performance double glazing, provide superior insulation, preventing drafts 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?

Getting started with Bowalker Windows is straightforward and structured to move your project forward without delays. Begin by arranging a consultation, receive a clear and fixed quotation based on your requirements, and proceed to installation with a confirmed schedule and in-house team handling the work from start to finish.

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Our Serving Areas

Bowalker provides professional 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

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.

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 certified window installers, premium quality glazing systems, and a 10-year insurance-backed guarantee to ensure long-term reliability and performance

Call 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?

The sash window installation costs around £150-£2,000 per window, depending on material selection, window size, and glazing type. uPVC sash windows cost £500-£800, while timber sash windows range from £1,000-£2,000+ per unit, with higher prices in areas such as London due to labour and access requirements. The final cost of sash window installation varies based on factors such as material choice, glazing type, window size, design complexity, property type, and installation requirements, including access and compliance with building regulations.

What Materials Are Sash Windows Made From?

Sash windows are manufactured using materials such as timber, uPVC, and aluminium frames. 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 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 certified window installers will carry out the work professionally, ensuring security, careful handling, and adherence to your specifications.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

How Much Does It Cost to Replace Sash Windows?

Replacing a sash window costs between £328 and £4,800 per window, depending on the material, window size, glazing type, and the extent of the replacement required. The total cost of sash window replacement varies depending on factors such as whether it is a full replacement or a partial refurbishment, the type of sash windows, and the condition of the existing sash windows.

sash-windows

Description

Transform Your Home with Premium Sash Windows

Professional Sash Windows Installation & Replacement Services

Materials

uPVC

Timber

Standard Hardware

Chrome

Satin

Gold Knob

Antique Black Knob

Standard Colours

Smooth

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

Featured partners

Why Do Homeowners Choose Bowalker For Sash Windows Installation Services?

Types Of Windows We Install

Picture Window

Bifold Window

Replacement Sash Window

Crittall Look Window

Double Glazed Windows

Triple Glazed Windows

Obscure Windows

Astragal Bars Windows

Satin Windows

Leaded Windows

Georgian Bars Windows

uPVC Windows

Wooden Windows

Aluminium Windows

Timber Windows