Double Glazed and Comfort Glass Windows in Bromley and Dartford, to Maidstone and Sevenoaks

At Fineline, we offer a choice of uPVC and aluminium windows in five styles that can be designed in a range of RAL colours and finishes. We can also install bespoke windows to fit niche shapes. You can choose double, secondary, comfort glass or decorative glazed windows to meet your specific requirements. Whichever design you choose, you can be sure that our high-performance window profiles will improve your home’s energy efficiency and security, whilst keeping external noises out.

For new windows in Maidstone, Bromley, Dartford, Sevenoaks and across Kent FineLine can help you from design to installation.

Make an enquiry
  • Roof IconRoof IconChoose by style Tab arrow
  • Roof IconRoof IconChoose by material Tab arrow
  • Glazing IconGlazing IconBrowse glazing Tab arrow
  • Roof IconRoof IconCustomise Your Window Tab arrow
  • Choose by style

    Choose by material

    Browse glazing

    Customise Your Window

    A range of window designs to suit any home

    Our window collection offers an array of design choices that will easily add value and style to any property. Custom-designed to each homeowner, we’ll be able to design the perfect solution for your preferences. You can choose from uPVC or aluminium frames, and with up to 150+ RAL colour choices, dependent on the material, the options are endless! You could even decide on dual-coloured frames, so that the inside and outside colours will blend with your home perfectly. We also offer decorative glass options for an even more distinctive aesthetic.

    As well as our five window styles, we also offer a bespoke window service to accommodate homeowners who are looking to fit more niche spaces. Our expert team have previously installed arched, circular and even triangular windows, uniquely shaped to each project.

    Our window furniture range will cater to any personal tastes as it varies from contemporary sleek handlebars to traditional peg handle styles. They can be fitted in a number of colour choices, adding the perfect finishing touches to your new windows.

    Dependent on the window style you opt for, you may be able to choose between double, comfort glass or secondary glazing. Double glazing is the most popular choice for UK homeowners as it provides excellent thermal performance and is the most cost-effective option. Comfort glass windows may be the best solution for properties in noisy areas or where they’re more exposed to harsher weather, as the extra materials heightens the thermal performance, meaning it can achieve U-values as low as 1.3 W/m2K. If you reside in a listed property, our secondary glazed windows are approved for use in conservation areas. You’ll be able to upgrade your window’s performance without compromising on the heritage style.

    View our RAL colour chart
    Large grey aluminium casement window
    Hardwood bay window installation

    Energy-efficient window installations across Tonbridge, Rochester and Canterbury

    With Fineline, you can be sure that you’re getting the very best quality available on the market. Our windows can achieve A+ window energy ratings which is the top grade possible. This means they’ll stop energy wastage and ensure for a comfortable temperature inside of your home all year round. You’ll instantly notice these benefits and even see your heating bills reduce over the year.

    With multi-chambered uPVC profiles and thermally broken aluminium frames, regardless of the material, they’ll keep your home energy efficient whilst helping to reduce your carbon footprint. The components that lead to such outstanding thermal performances will depend on the individual specification, but can include warm edge spacer bars, argon-gas filled double or comfort glass and treated glass that uses the sun’s rays to either warm the room or deflect the heat, depending on the outdoor conditions.

    Reduce the impact of external noises within your home

    If you currently suffer from noticing the outdoor sounds interrupting your peace inside, then replacing your windows is an easy solution. The same manufacturing processes that improve a window’s thermal capabilities also help with their noise reduction. Our advanced glazing panes, warm edge spacer bars and chamber filled frames all work together to reduce the sound currents from entering your home. With new windows, you’ll be able to enjoy peace and quiet all day, every day.

    Window buying process
    uPVC Bay Window
    White composite conservation window

    Windows fitted with industry-leading security hardware

    You can be assured that all of our new windows incorporate a variety of security features to keep your home safe and secure. With sophisticated multi-point locking systems that bolt the frame to the window pane at several points, the resilience is exceptionally enhanced. We also use shootbolt systems, beaded frames and sophisticated handles in our window specifications that have been thoroughly tested to strict security standards. If you’re looking for even further home security, we can include additional security extras for the ultimate peace of mind.

    Kent’s most reputable home improvement experts

    For over 50 years we’ve been installing home improvements, including quality windows, to customers across Kent. Over this time, we’ve accrued a wealth of positive customer feedback; see our outstanding Trustpilot reviews which illustrate both our excellent customer services and product quality.

    Our staff are excellently trained and work to meet industry regulations, maximising the security of your home. We know Kent like the back of our hands, not being a national installer means our local knowledge helps us to find the best options for your home. We’re large enough to have full expertise in house and no jack of all trades but we’re small enough to care about each and every homeowner. Our team are fully committed to our customer’s projects like they’re our own, meaning you’ll get honest advice and outstanding services.

    See our 9.5 Trustpilot score
    Angled white uPVC window

    Competitive replacement window prices

    If you are looking for new or replacement windows that won't cost you an arm and a leg, look at our expansive range of double and comfort glass windows. We compete with our competitors on all aspects, including costs. With our flexible finance options, you can be sure to get a quality installation to meet your budget.

    Finance options

    Award winning and accredited double glazed windows

    Our unique collection of awards and accreditations make us stand out from our competitors. We’re the G Award’s Installer of the Year and Master Window and Conservatory Installers Association company of the year. We haven’t peaked here, as part of the SEH group, we’re nominated for even more awards. Our accreditations put us miles ahead and you can trust our services abide by strict industry regulations and standards.

    See our awards and accreditations
    White uPVC casement windows
    windows with integral blinds

    Double glazed windows with integrated blinds

    Integral blinds are securely slotted within the two panes of glass in a window. They have become a popular addition to new windows and doors with homeowners across the UK for a number of reasons. As they're placed within the window itself, they aren't exposed to the outdoor elements so won't require any maintenance. They'll stay in prime condition without gathering dust or fading, thanks to anti-fade colouring. Our integral blinds are compliant with industry safety campaigns and bodies, making them an excellent choice for homeowners with young children or animals.

    Another benefit of incorporating integral blinds is that they provide an easy way to control your home's temperature and privacy. With either a slider or cordless slider option, you can simply choose when to let the natural light in to brighten the room, or when you'd like more privacy.

    We offer a number of blind styles in a range of colours to suit any style of room's appearance. You can choose from horizontal or pleated styles. If you're considering adding integral blinds to your replacement windows, what about also including them into bi-fold doors or your conservatory for a consistent style across your home?



    All of our windows offer excellent thermal benefits for you and your family; saving you money on your heating bills. With the highest Window Energy Ratings (WER) available, your home will stay warm and comfortable all year round with reliable double-glazing or highly efficient triple glazing.



    Offering acoustic as well as thermal insulation, our windows will successfully block any unwanted noise pollution with the help of reliable double-glazing or acoustically-sound triple glazing. The right choice for those living near busy roads, under flight paths or in town and city centres.



    Your security is as important to us as it is to you. With a range of locking mechanisms available you can be assured that your home is safe and secure, with the help of protective double-glazing or highly efficient triple glazing.



    From the first quote through to aftercare, the process is made as simple as possible for you. Our professional installers will carry out the installation swiftly and with the utmost care. Our customer service team will promptly deal with any other queries you may have after completion.

    Quality products Great prices

    Request a quote

    Buying a product through FineLine offers you real peace of mind

    Customer promise

    We have the knowledge and experience to provide you with exactly what you need. Our staff are expertly trained to guide and advise you. We offer you a 10 Year Guarantee.

    Read our customer promise

    We are one of the largest Fensa Aproved regional retail companies.

    TrustMark AprovedVetted for professionalism, competency & compliancy

    Our Accreditations

    BSI 9001 2015
    Fensa Approved Installer
    Ultraframe conservatory installer