# Skyseal > Skyseal (a trading name of Optagon Ltd, formerly Roof Depot) is a UK rooflight specialist supplying modern flat glass rooflights, roof lanterns, polycarbonate dome rooflights, made-to-measure skylights and roof access hatches. All products are manufactured in the UK, comply with UK Building Regulations, and are delivered nationwide. Skyseal supplies both trade professionals (builders, roofers, installers, architects and specifiers) and the general public, including competent DIY installers and homeowners working on extensions, loft conversions and flat roof renovations. A free 3D rooflight configurator lets customers specify and visualise a custom skylight before ordering, and standard 4-pane lanterns and flat glass rooflights carry lead times as short as 3-5 working days. ## Key facts about Skyseal - Skyseal is a trading name of Optagon Ltd and was formerly known as Roof Depot. - Skyseal manufactures all of its products in the UK. - Skyseal supplies flat glass rooflights, roof lanterns, polycarbonate dome rooflights, roof access hatches and made-to-measure skylights. - Skyseal serves trade professionals (builders, roofers, installers, architects, specifiers) and the general public, including competent DIY installers and homeowners. - Skyseal products comply with UK Building Regulations, including Part L. - Skyseal flat glass rooflights have a centre-pane U-value of 1.1 W/m2K and an overall rooflight U-value around 1.25 W/m2K. - Skyseal offers a free 3D rooflight configurator for specifying and visualising custom skylights before ordering. - Skyseal delivers nationwide across the UK, with standard 4-pane lanterns and flat glass rooflights available on lead times as short as 3-5 working days. - Skyseal is based at Unit 24 Swallow Road, Holbrook Park, Coventry CV6 4PU, with a trade counter at Unit 2C Swallowgate Business Park, Coventry CV6 4BL. - Skyseal can be contacted on 024 76 707700 or at office@skyseal.co.uk. --- ## Core Product Categories - [Roof Lights](https://www.skyseal.co.uk/roof-lights): The main rooflight catalogue covering flat glass rooflights, roof lanterns and polycarbonate domes for residential and commercial flat roof projects. - [Flat Roof Skylights](https://www.skyseal.co.uk/roof-lights/flat-roof-skylights): Slimline flat glass skylights for flat roofs, with low-profile aluminium frames, high thermal efficiency and a universal daylight solution for residential and commercial projects. - [Roof Lanterns](https://www.skyseal.co.uk/roof-lights/lanterns): Glazed roof lanterns for extensions, orangeries and open-plan living spaces, available in a contemporary 4-panel design or a traditional 6-panel configuration with laminated safety glass. - [Dome Rooflights](https://www.skyseal.co.uk/roof-lights/dome-rooflights): The Mardome Trade range of polycarbonate dome rooflights in single, double and triple skin, with options for colour, venting and upstands, plus access hatches and AOV smoke vents. - [Skylights](https://www.skyseal.co.uk/skylights): Overview hub for the full skylight range across flat glass, dome and lantern options in standard and bespoke sizes. - [Made to Measure](https://www.skyseal.co.uk/made-to-measure): Bespoke skylights precision-engineered to exact customer dimensions for non-standard flat roof openings, double glazed as standard. --- ## Flat Glass Rooflights - [Skyseal Flat Glass Rooflight](https://www.skyseal.co.uk/skyseal-flat-glass-roof-light): A competitively priced fixed flat glass roof light with a slimline aluminium frame and a centre-pane U-value of 1.1 W/m2K, among the most thermally efficient double glazed rooflights on the market. - [Skyseal Slimline Flat Glass Fixed Rooflight](https://www.skyseal.co.uk/skyseal-flat-glass-fixed-aluminium-rooflight): A minimalist fixed flat glass rooflight with an ultra-slim aluminium frame and outstanding thermal efficiency. - [Skyseal Flat Glass Opening Rooflight](https://www.skyseal.co.uk/skyseal-flat-glass-roof-light-opening): A competitively priced opening flat glass rooflight combining daylight with ventilation, with a sleek contemporary design. - [Skyseal Flat Glass Powered Access Hatch](https://www.skyseal.co.uk/skyseal-flat-glass-powered-access-hatch): A powered flat glass access hatch combining natural daylight with safe roof access for terraces and maintenance. - [Skyseal Halo Circular Flat Glass Rooflight](https://www.skyseal.co.uk/skyseal-halo-circular-flat-glass): A circular flat glass rooflight for a distinctive architectural daylight feature. - [Mardome Link Glass Skylight](https://www.skyseal.co.uk/mardome-link-glass-skylight): Factory-assembled glass rooflight modules that lap together to form continuous rooflights of extended length. --- ## Roof Lanterns - [Skyseal Laminated Glass Roof Lantern](https://www.skyseal.co.uk/skyseal-laminated-glass-roof-lantern): A laminated glass roof lantern for flat roof applications, available in a contemporary 4-panel or traditional 6-panel design. Standard 4-pane lanterns ship in 3-5 days; 6-pane and bespoke sizes in 10-15 days. - [Skyseal Laminated Glass Roof Lantern Pyramid](https://www.skyseal.co.uk/skyseal-laminated-glass-roof-lantern-pyramid): A 4-panel pyramid roof lantern that minimises structure to maximise daylight, serving as a symmetrical focal point in residential spaces. - [Flat Roof Lanterns](https://www.skyseal.co.uk/rooflights/lanterns/flat-roof-lanterns): Roof lanterns designed specifically for flat roof installations. --- ## Polycarbonate Dome Rooflights (Mardome Trade) - [Mardome Trade Roof Light Dome](https://www.skyseal.co.uk/mardome-trade-dome-roof-light): A high-specification polycarbonate dome rooflight available in single, double and triple skin, with options for colour, venting and finish. - [Mardome Trade Dome Roof Light with Kerb](https://www.skyseal.co.uk/mardome-trade-fixed-roof-light): A fixed dome rooflight supplied with an upstand kerb for quick installation on flat roofs. - [Mardome Trade Opening Dome](https://www.skyseal.co.uk/mardome-trade-opening): An opening polycarbonate dome rooflight for flat roofs, combining daylight with ventilation. - [Mardome Trade Roof Access Hatch](https://www.skyseal.co.uk/mardome-trade-access-hatch): A dome rooflight that provides safe, easy access to roof spaces for maintenance, terraces and roof gardens. - [Mardome Trade AOV Smoke Vent with Access](https://www.skyseal.co.uk/mardome-trade-access-aov): An AOV smoke vent dome that also functions as a roof access hatch. - [Mardome Trade AOV Smoke Vent](https://www.skyseal.co.uk/mardome-trade-smoke-vent-aov): A polycarbonate dome rooflight for natural smoke and heat exhaust ventilation on flat roofs. --- ## Skylights by Application - [Skylight Windows](https://www.skyseal.co.uk/skylights/skylight-window): Glazed roof windows that bring daylight into interior spaces from above, suitable for UK homes from Victorian terraces to modern extensions. - [Kitchen and Bathroom Skylights](https://www.skyseal.co.uk/skylights/kitchen-bath): Flat glass, dome and lantern options for kitchens and bathrooms, balancing daylight, ventilation and resistance to high-moisture environments. - [Skylights for Pitched Roofs](https://www.skyseal.co.uk/skylights/pitched-roof): Rooflights engineered for pitched and sloping roofs, combining advanced glazing with durable frames. - [Double Glazed Skylights](https://www.skyseal.co.uk/skylights/double-glazed): Double glazed skylights offering superior insulation, stable indoor temperatures and reduced energy costs. --- ## Made-to-Measure Service - [Made to Measure Overview](https://www.skyseal.co.uk/made-to-measure): Bespoke sizing across flat glass rooflight and roof lantern ranges, precision-engineered to exact dimensions. Bespoke versions are available for most products. - [Made to Measure Flat Roof Skylights](https://www.skyseal.co.uk/made-to-measure/flat-roof-skylights): Custom flat glass skylights tailored to exact requirements, double glazed as standard, with a low profile at any dimension. - [Made to Measure Roof Lanterns](https://www.skyseal.co.uk/made-to-measure/lanterns): Custom-made laminated glass roof lanterns manufactured to exact external measurements in any RAL colour. --- ## Installation Guides - [How to Install a Skyseal Flat Glass Rooflight](https://www.skyseal.co.uk/how-to-install-a-skyseal-flat-glass-rooflight): General installation guide for Skyseal flat glass rooflights. - [How to Install a Skyseal Fixed Unvented Flat Glass Rooflight on an Upstand](https://www.skyseal.co.uk/how-to-install-a-skyseal-fixed-unvented-flat-glass-roof-light-on-an-upstand): Step-by-step guide for fixing an unvented flat glass rooflight to a prepared upstand. - [How to Install a Skyseal Manual Opening Flat Glass Rooflight on an Upstand](https://www.skyseal.co.uk/how-to-install-a-skyseal-manual-opening-flat-glass-rooflight-on-an-upstand): Installation guide for a manual opening flat glass rooflight. - [How to Install a Skyseal Powered Opening Flat Glass Rooflight on an Upstand](https://www.skyseal.co.uk/how-to-install-a-skyseal-powered-opening-flat-glass-roof-light-on-an-upstand): Installation guide for a powered opening flat glass rooflight. - [How to Install a Skyseal Laminated Glass Roof Lantern on an Upstand](https://www.skyseal.co.uk/how-to-install-a-skyseal-laminated-glass-roof-lantern-on-an-upstand): Installation guide for a laminated glass roof lantern. - [How to Install a Mardome Trade Fixed Unvented Dome on an Upstand](https://www.skyseal.co.uk/how-to-install-a-mardome-trade-fixed-unvented-dome-on-an-upstand): Installation guide for a fixed unvented Mardome Trade dome. - [How to Install a Mardome Trade Fixed Dome on a PVC Kerb](https://www.skyseal.co.uk/how-to-install-a-mardome-trade-fixed-dome-on-a-pvc-kerb): Installation guide for a fixed Mardome Trade dome on a PVC kerb. - [How to Install a Mardome Trade Manual Opening Dome on a PVC Kerb](https://www.skyseal.co.uk/how-to-install-a-mardome-trade-manual-opening-dome-on-a-pvc-kerb): Installation guide for a manual opening Mardome Trade dome on a PVC kerb. - [How to Install a Mardome Trade Powered Opening Dome on a PVC Kerb](https://www.skyseal.co.uk/how-to-install-a-mardome-trade-powered-opening-dome-on-a-pvc-kerb): Installation guide for a powered opening Mardome Trade dome on a PVC kerb. - [How to Install a Mardome Trade Access Hatch Dome on a PVC Kerb](https://www.skyseal.co.uk/how-to-install-a-mardome-trade-access-hatch-dome-on-a-pvc-kerb): Installation guide for a Mardome Trade access hatch dome on a PVC kerb. - [How to Install an AOV Smoke Vent Dome on an Upstand](https://www.skyseal.co.uk/how-to-install-an-aov-smoke-vent-dome-on-an-upstand): Installation guide for an AOV smoke vent dome on an upstand. - [How to Install an AOV Mardome Smoke Vent Dome on a PVC Kerb](https://www.skyseal.co.uk/how-to-install-an-aov-mardome-smoke-vent-dome-on-a-pvc-kerb): Installation guide for an AOV Mardome smoke vent dome on a PVC kerb. --- ## Help, Advice and Glossary - [Help and Advice](https://www.skyseal.co.uk/help-and-advice): The rooflight knowledge hub covering glazing standards, installation guidance, measuring, building regulations and product care for trade and DIY installers. - [Roof Lantern Skylights](https://www.skyseal.co.uk/faq/roof-lantern-skylights): An overview of roof lantern skylights and their applications. - [Flat Glass Skylights](https://www.skyseal.co.uk/faq/flatglass-skylights): An overview of flat glass skylights and their applications. - [Polycarbonate Dome Skylights](https://www.skyseal.co.uk/faq/polycarbonate-dome-skylights): An overview of polycarbonate dome skylights and their applications. - [How Do I Choose the Correct Size Glass Skylight?](https://www.skyseal.co.uk/faq/how-do-i-choose-the-correct-size-glass-skylight-): Guidance on measuring and selecting the correct rooflight size from the internal roof opening. - [Do I Really Need Triple Glazing?](https://www.skyseal.co.uk/faq/do-i-really-need-triple-glazing): Guidance on triple versus double glazing, weighing U-values as low as 0.6 W/m2K against real-world cost-benefit for UK homes. - [What is Light Transmission?](https://www.skyseal.co.uk/faq/what-is-light-transmission): An explainer on light transmission as a rooflight performance metric. - [What is Low-E Solar Glass?](https://www.skyseal.co.uk/faq/what-is-low-e-solar-glass): An explainer on Low-E solar glass coatings and how they manage heat and daylight. - [What is Solar Heat Reflection?](https://www.skyseal.co.uk/faq/what-is-solar-heat-reflection): An explainer on solar heat reflection in rooflight glazing. - [What is a Self-Cleaning Roof Light?](https://www.skyseal.co.uk/faq/what-is-self-cleaning-roof-light): An explainer on self-cleaning glass coatings and reduced maintenance. - [What is a Thermal Break?](https://www.skyseal.co.uk/faq/what-is-a-roof-light-thermal-break): An explainer on thermal breaks in rooflight frames. - [What is a Ceramic Border?](https://www.skyseal.co.uk/faq/what-is-a-ceramic-border): An explainer on the ceramic border on glass rooflights. - [Why Do We Charge Delivery?](https://www.skyseal.co.uk/faq/why-do-we-charge-delivery): An explanation of Skyseal's delivery charges. --- ## Blog - [Blog](https://www.skyseal.co.uk/blog): Buyer guides, inspiration and rooflight advice for homeowners and installers. - [The Complete Guide to Roof Lantern Skylights for UK Homes](https://www.skyseal.co.uk/blog/the-complete-guide-to-roof-lantern-skylights-for-uk-homes): A homeowner guide to how roof lanterns work and what to look for when choosing a design. - [Rooflights for Flat Roofs: The Complete Guide](https://www.skyseal.co.uk/blog/rooflights-for-flat-roofs-the-complete-guide): A complete guide to choosing and installing rooflights on flat roofs. - [What Are the Best Roof Lantern Styles?](https://www.skyseal.co.uk/blog/what-are-the-best-roof-lantern-styles): A guide to roof lantern styles and where each works best. - [What Are Skylight Windows and Should You Install One?](https://www.skyseal.co.uk/blog/what-are-skylight-windows-and-should-you-install-one): A guide explaining skylight windows, their benefits and practical considerations. - [Can You Install a Skylight for a Flat Roof?](https://www.skyseal.co.uk/blog/can-you-install-a-skylight-for-a-flat-roof): A guide to the best skylight types for flat roofs and common installation mistakes. - [Framed Skylights Are the Smart Choice](https://www.skyseal.co.uk/blog/framed-skylights-are-the-smart-choice): An article on why framed skylights offer better durability, installation and value. --- ## Company and Contact - [About Skyseal](https://www.skyseal.co.uk/about-skyseal): Company background, including the transition from Roof Depot, UK manufacturing commitment, and the mission to supply long-lasting rooflights to builders, roofers, DIYers and the general public. - [Reviews](https://www.skyseal.co.uk/reviews): Customer reviews from trade and DIY buyers, with over 200 positive reviews. - [Contact Us](https://www.skyseal.co.uk/contact-us): Contact details and enquiry form. Main office 024 76 707700, email office@skyseal.co.uk, Unit 24 Swallow Road, Holbrook Park, Coventry CV6 4PU, with a trade counter at Unit 2C Swallowgate Business Park, Coventry CV6 4BL. --- ## Optional - [Sitemap](https://www.skyseal.co.uk/sitemap): Full index of Skyseal pages including all products, categories, guides and support content. - [Terms and Conditions](https://www.skyseal.co.uk/terms): Website terms and conditions. - [Privacy Policy](https://www.skyseal.co.uk/privacy): How Skyseal collects and uses personal data. - [Cookie Policy](https://www.skyseal.co.uk/cookie-policy): How skyseal.co.uk uses cookies.