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A modern flat roof extension in Bromley and Dartford to Maidstone and Sevenoaks

Do you envisage a contemporary extension space that allows your indoor and outdoor space to smoothly connect? Complying with present-day Building Regulations, our modern flat roof extensions are weather-resistant and thermally sound, as well as eye-catching. Boosting classic and modern styled properties alike, each Fineline flat roof extension is built and project managed by our knowledgeable team of experts to create your ultimate ‘forever home’.

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  • Rooflight Options
  • Soffit Options
  • Fascia Options
  • Rooflight Options

    A flat roof.

    A flat roof.

    Flat skylight roof light option

    Flat skylight roof light option

    Lantern roof light option

    Lantern roof light option

    Soffit Options

    Small soffit option

    Small soffit option

    Medium soffit option

    Medium soffit option

    Large soffit option

    Large soffit option

    Fascia Options

    Classic fascia option

    Classic fascia option



    Parapet fascia

    Parapet fascia

    What is a flat roof extension?

    Depending on your specific improvement project, you can choose from several square or rectangular sizes to suit your individual project. Designed to deliver striking uninterrupted sightlines that bathe the space in warm natural light, our Flat Skylight is at the cutting-edge of chic architectural design. Sitting flush (flat) to the internal plasterboard, our fixed skylights unite a fantastic frameless appearance from the interior and a fashionable, streamlined look on the outside. Traditionally styled homes in Kent can benefit too, with an elegant pitched lantern roof option tailored to your needs. Offering the widest range of bespoke design options, achieve the look you’ve always dreamt of with a FineLine Windows flat roof extension.

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    Roof light
    Lantern roofs

    A made to measure modern flat roof extension in Gillingham, Chatham, Ashford, and Rochester

    Modern flat roof extensions are perfect for new kitchen extensions, whilst beautifully updating existing extension spaces. No matter the project, our in-depth design process will guide you through each step so you’re fully informed of the exceptional design choices that can be achieved.

    Custom-made in a variety of stunning colour choices and finishes, for a really state-of-the-art look, take your new flat roof extension to the next level with an extended internal plastered soffit system*, a modern overhang on the roof to shelter the doors and level external flooring options to harmoniously unite inside and outside spaces like no other. Able to accommodate extra large rooflights up to 23m², turn those ‘Grand Design’ dreams into a reality with FineLine Windows.

    *Available in small, medium, or large, a soffit is a horizontal architectural feature built lower than the area around it. Its purpose is to conceal light fittings and speakers, adding stylish character to any extension.

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    The most robust & thermally-sound flat roof extension around

    Incredibly durable, long-lasting and energy efficient, our flat roof extensions never fail to add contemporary character. Able to notably reduce energy bills, depending on the amount of glazing used, you can look forward to exceptional U-values as low as 0.14W/m2K. Thanks to its advanced thermally broken aluminium sections, a FineLine modern flat roof extension allows you to achieve traditional orangery aesthetics that can be used all year round, regardless of the season or the weather.

    Another unique feature means it can span up to 5.8m above slimline bi-fold doors or sliding doors without costly and unattractive extra support. It also has a pre-manufactured ‘fall’ system to ensure water drains away efficiently.

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    Flat rooflight on an extension

    'Fast-fit' flat roof designs to complement any home in Kent

    A popular enhancement for homeowners that need more natural light and privacy, sophisticated, made-to-measure ‘edge-to-edge' flat skylights are a must within modern buildings across Kent and the Home Counties. Or if you’re lucky enough to live in a heritage, period, or more traditionally styled property, a gorgeous pitched lantern roof extension is sure to add unmatched grandeur.

    With limitless designs and finishing touches available, we can work with your personal requirements to build a captivating flat roof extension solution that exceeds all expectations.

    Your Conservatory Journey with FineLine

    Getting a new conservatory installed is a big decision. That’s why we make the process as straight forward as possible for you.


    Choose the right conservatory

    Fill out a form online or visit one of our 11 showrooms where one of our team of experts are on hand to help you design your dream conservatory and offer any advice. After we create your design we will visit your property to measure up and provide you with a free no-obligation quote.


    Place your order with us

    Once we’ve confirmed the final conservatory design, including decorative features, paired windows and doors, and roofing options, we’ll confirm and approve your order. Once we have received your order deposit, our administration team will provide your contract to a surveyor.


    Your surveyor assessment

    Our surveyor will contact you to arrange a convenient date to come to your home and review the project and take accurate measurements before we confirm the assessment. If a trial dig is required to determine the footings of your conservatory, we will arrange to carry this out.


    Pre-site check and confirm an installation date

    Our technical department will advise on whether planning permission is required and, if it is, our team will take care of this. Your designated project manager will contact you to arrange a pre-site check to finalise all of the specifics required before agreeing the dates for your installation.


    You're ready for your installation

    Our conservatory installers will arrive at the arranged time to begin work and will ensure as minimal disruption as possible. They’ll advise on maintenance tips for your new conservatory, and the functionality of the integrated windows and doors. Once your installation is complete, we will contact you to confirm that the project is 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.


      Get inspired with our product brochures

      Ready to make your dream home a reality but don’t know where to start? Find all the inspiration you need.

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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
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      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
      TSI Approved Code
      Ultra Installer
      QA National Warranties