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Flush Sash Windows in Bromley and Dartford, to Maidstone and Sevenoaks

When homeowners in Kent require timeless flush sightlines that refuse to compromise on present-day performance, they turn to the exquisite FineLine collection for the answer. Elegantly imitating the natural woodgrain synonymous with time-honoured timber, wood effect flush sash windows outperform real wooden frames in efficiency, security, and style. Custom-designed to accommodate a plethora of property styles, from on trend Anthracite Grey frames to softening Agate Grey frames, choose from an assortment of fine painted and woodgrain finishes, as well as an extensive RAL window colour palette with 150+ shades to choose from. Available with advanced double glazing or comfort glass, finish the look with three charismatic handle styles – standard, traditional or contemporary – complete with secure locking as standard.

 

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    White uPVC flush sash bay window

    Sitting flush

    The opening sash of the window fits flush with the outer frame for a seamless appearance

    Hidden Corner Weld

    An unseen corner joint helps create a seamless look. Choose from a fully welded, full mechanical or MechWeld joint

    Identical sightlines

    Enhance your home with same-width frames for equal sightlines

    What is a flush sash window?

    Intricately made to seamlessly replicate the look of authentic timber, flush sash windows fit sleekly into the window frame, instead of slightly overlapping the window frame, for a smooth finish. Created from the highest quality and low maintenance uPVC, our flush sash windows deliver unmatched thermal insulation and weather protection, alongside intricate handcrafted details unseen on a timber alternative window - until now.

    Why choose a flush sash window?

    Cost-effective, authentic timber sightlines

    Much cheaper to construct than timber, our uPVC flush sashes can be customised in three realistic jointing options; fully welded, full mechanical, or mechanical/weld.

    Advanced thermal insulation

    Available with 3, 5 and 6 insulating chambers, our multi-chambered uPVC flush sash windows attain A energy ratings with ease.

    Superior security

    Complete with secure multi-point locking and able to last up to 35 years, our flush sashes are PAS 24 security accredited as standard.

    Low maintenance

    Our uPVC flush sash windows offer a maintenance-free design that won't rot, crack, warp, or fade throughout its lifespan (unlike real timber).

    Sustainably sourced

    As well as offering EcoMax Glass as standard, our flush sash windows are created from 80% recycled manufacturing off cuts.

    Peace of mind

    Backed by a 10-year guarantee and a commitment to exceptional craftsmanship and customer satisfaction.

    Compare Window Styles

    Casement Windows

    Casement Windows

    • Available in high-performance uPVC or aluminium
    • U-values as low as 0.8 W/m2K
    • Multi-point locking system
    Bay Windows

    Bay Windows

    • Available in high-performance uPVC or aluminium
    • U-values as low as 0.8 W/m2K
    • Multi-point locking system
    Heritage Windows

    Heritage Windows

    • Made from uPVC to replicate timber
    • Achieve A++ energy ratings
    • Multi-point locking system
    Tilt & Turn Windows

    Tilt & Turn Windows

    • Available in high-performance uPVC or aluminium
    • U-values as low as 1.0 Wm2K
    • Multi-point locking system
    Conservation Windows

    Conservation Windows

    • Made from uPVC to replicate timber
    • Achieve A++ energy ratings
    • Multi-point locking system
    Sliding Sash Windows

    Sliding Sash Windows

    • uPVC authentic timber-alternative sash window
    • U-values of 1.4 W/m²k or lower
    • Multi-point locking system
    Bespoke Windows

    Bespoke Windows

    • Available in high-performance uPVC or aluminium
    • U-values as low as 0.8 W/m2K
    • Multi-point locking system
    uPVC Windows

    uPVC Windows

    • Robust and durable frames
    • Available in seven styles
    • 20 years life expectancy, maintenance free
    Aluminium Windows

    Aluminium Windows

    • Minimalist frames and sightlines
    • Available in four styles
    • Available in four styles Over 30 years life expectancy, minimal upkeep
  • Colours
  • Glazing
  • Frame Options
  • Furniture
  • Additional Features
  • Available across Kent
  • Colours

    Choose from a wide range of colours and finishes, including our dual colour options, to have the window colour you've always dreamt of.

    White

    White

    Clotted Cream

    Clotted Cream

    Pearl Grey

    Pearl Grey

    Chartwell Green

    Chartwell Green

    Elephant Grey

    Elephant Grey

    Slate Grey

    Slate Grey

    Slate Grey Grained

    Slate Grey Grained

    Basalt Grey

    Basalt Grey

    Anthracite Grey

    Anthracite Grey

    Anthracite Grey Grained

    Anthracite Grey Grained

    Black Brown

    Black Brown

    Steel Blue

    Steel Blue

    Racing Green

    Racing Green

    Ruby Red

    Ruby Red

    Turner Oak

    Turner Oak

    Irish Oak

    Irish Oak

    Golden Oak

    Golden Oak

    Rosewood

    Rosewood

    Mahogany

    Mahogany

    Walnut

    Walnut

    Dark Oak

    Dark Oak

    Glazing

    Both ECOMax double glazing and Comfort Glass are available in the casement styles and we can also offer a range of textured and patterned glazing for added privacy or decoration. The benefits of upgrading your glazing are truly limitless - the most notable features include increased warmth, reduced energy bills & beating future energy price hikes. For complete peace of mind, we also offer toughened glazing options to enhance your home security further.

    The benefits of upgrading your glazing are truly limitless - the most notable features include increased warmth, reduced energy bills & beating future energy price hikes. For complete peace of mind, we also offer toughened glazing options to enhance your home security further.

    Frame Options

    Choose the perfect profile for your finished window

    We have a number of distinctive styles of frame to choose from. The chamfered option is a contemporary, straight-edged style while the ovolo option provides a more traditional, decorative finish. Our flush option sees sashes that finish flush with the external face of the window.

    Ovolo Frame

    Ovolo Frame

    Flush Sash Frame

    Flush Sash Frame

    Chamfered Frame

    Chamfered Frame

    Furniture

    Stylish furniture to make your windows even more complete

    We offer a range of furniture for your windows to look the part. Whether you want the traditional look with monkey tail handles in a vintage finish, or contemporary brushed steel, our elegantly designed handles bring form to functionality and are designed to fit naturally into the user’s hand. You can also choose from our selection of window restrictors and pegs.

    Furniture Handle Options

    Window Handle

    Window Handle

    Pear Drop Handle

    Pear Drop Handle

    Monkey Tail Handle

    Monkey Tail Handle

    Furniture Colour Options

    Black Finish

    Black Finish

    Brass Finish

    Brass Finish

    White Finish

    White Finish

    Chrome Finish

    Chrome Finish

    Steel Finish

    Steel Finish

    Additional Features

    Stylish furniture to make your windows even more complete

    We offer a range of furniture for your windows to look the part. Whether you want the traditional look with monkey tail handles in a vintage finish, or contemporary brushed steel, our elegantly designed handles bring form to functionality and are designed to fit naturally into the user’s hand. You can also choose from our selection of window restrictors and pegs.

    Authentic Timber Look Cill

    For an even more authentic look, our Radlington Cill is a superior upgrade to our standard cills. Comprising of deeper nosed cills, one at the standard 30mm height and another at a 55mm height, these are modern interpretations of timber cills.

    Overhead Ventilation

    Our overhead concealed ventilation features an overhead slot vent system that incorporates the ventilation in the head drip, meaning the external trickle vent is concealed on the head of the outer frame, providing a much-improved finish.

    Available across Kent

    Wide range of window styles across Kent and the South East

    At Fineline Windows, we take pride in transforming houses into homes by providing top-quality double glazing solutions. With a passion for excellence and a commitment to customer satisfaction, we have become the go-to choice for homeowners across Kent and the South East seeking to enhance the beauty, energy efficiency, and security of their properties.

    Our dedicated team of experts combines skill, precision, and a wide range of window options to cater to your unique needs and preferences. Whether you're looking for stylish uPVC windows, energy-efficient double glazing, or durable aluminum frames, we have the perfect solution for you.

    Explore our exceptional double glazing services in the following locations across Kent and the South East:

    Enhance the comfort, aesthetics, and value of your home with Fineline Windows. Connect with us today and let us make your dream of beautiful, energy-efficient windows a reality. Your satisfaction is our mission!

    Modern flush sash windows bespoke to your Kent home

    From historic building conversions in Canterbury to attractive new build homes in Bromley, no matter the project scale, sophisticated flush sash windows are intricately tailored to meet and exceed all your expectations.

    FineLine Window’s give you the freedom to enhance your home’s existing character that little bit further with the choice of classic mechanical or welded joints. Fine finishing touches include 10 standard original timber-replica finishes, 1 smooth gloss finish, 150+ customer RAL colours, and traditional extras like Georgian bars, decorative glass, or beautiful leaded diamond detailing.

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    Single white flush sash window
    Close up of flush sash window

    Can I put uPVC windows in a listed building?

    If you live in a listed building or a home located in a conservation area, extra care must be taken to retain the original look of the property. Unauthorised improvement work in designated areas can result in an unlimited fine, so if you're unsure whether your home is in a conservation area, get in touch with your Local Authority for clarity before going ahead with any work.

    High-quality timber replica windows (like ours!) are designed to pass strict regulations often imposed on listed buildings, conservation areas, Areas of Natural Beauty (AONBs), and other areas limited by protective Article 4 Directions. So, you have absolute peace of mind your home complies with the rest of the neighbourhood, whilst looking its very best at all times.

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    Flush sash windows with exceptional performance

    Flush sash windows are also renowned throughout the industry for their exceptional energy efficiency levels. Able to achieve A energy ratings with ease, choose between 28 mm double glazing or 32 mm comfort glass and instantly feel the difference; thermally, aesthetically, and economically!

    Utilising the latest multi-point shoot bolt security locks, lockable window handles, and a night vent facility for a secure flow of air, with flush windows you’ll never have to worry about real-timber-related issues like pest infestation, dry rot, warping or twisting either. Simply sit back, relax, and look at your home from a different perspective with handcrafted timber-alternative windows from FineLine.

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    Black flush sash window

    Your Window and Door Journey with FineLine

    Replacing your windows and doors is easy.

    01

    Choose the right windows and doors

    Fill out a form online or visit one of our 11 showrooms to see our range of high-quality windows and doors up close and speak to our expert team for any advice on materials, styles, colours, energy efficiency and glazing. Once you are happy with your choice, we’ll provide you with a free no-obligation quote.

    02

    Place your order with us

    When you want to go ahead with your order, the details have been approved, and we have received your order deposit, our administration team will provide your contract to a surveyor.

    03

    Your surveyor assessment

    The surveyor will contact you to arrange a date that is convenient to come to your home and review the project scope, take accurate measurements and discuss any other matters that need to be considered. We will then confirm the surveyor’s assessment.

    04

    Confirm an installation date

    Our installation department will contact you to arrange a date for your window and/or door installation and your products will be ordered and manufactured, using cutting-edge techniques and industry-leading materials.

    05

    You're ready for your installation

    On the day, our skilled team will arrive at the agreed time to install your products, ensuring minimal disruption. They’ll explain the locking and opening systems and share maintenance tips to keep your products looking brand new. Once your installation is complete, we will contact you to confirm that everything has been finished.

    Begin Your Project

    Get your free quote – with no-obligation to buy. Simply fill in the form below to get started:







      By submitting your details you confirm that you agree to the storing and processing of your personal data by FineLine as described in the privacy statement.

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      Multi-award winning company

      Here at FineLine, we’re proud to have won many prestigious awards for our products as well as our work in the community:

      Installer awards 2022
      G21 Finalist
      SEHBAC showroom winner
      Ultraframe designer winner
      Conservatory and orangery awards winner 2019
      NHIC 2018 Consumer confidence award
      G17 Installer of the year
      Learn more

      We’re one of the largest

      regional retail companies

      Vetted for professionalism, competency & compliancy

      Improving South East homes for more than 50 years

      With show centres across the South East, you’re not far away from achieving your dream home:

      See our show centres

      Our Accreditations

      FENSA Approved
      GGF
      TSI Approved Code
      Ultra Installer
      TGAS
      Trustmark
      QA National Warranties
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