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2.2m x 5m Roof Lantern Heat Gain: Complete Cost and Solution Report

Introduction To Electric Roof Lantern Blinds

Thank you for taking the time to talk with me about your project. Based on our conversation, I’ve put together this report to reflect what matters most to you. Inside, you’ll find examples of the systems we discussed, how they would work in your space, and what you can realistically expect in terms of performance and cost.

When you’re ready, you can book a TEAMS call with me and I’ll walk you through everything step by step.

The Area

  • Roof Lantern 2200mm x 5000mm with no exterior self-clean coating
  • Open plan living space (kitchen, dining and lounge rooms)

    The Key Priority

    • Dramatically reduce solar heat gain
    • Twin Athena Electric Roof Blinds
    • Hercules XL Electric Roof Blind
    • Artemis External Electric Roof Blind
    • Honeycomb Sky Battery powered electric roof blind
    • Exterior 3M Prestige Solar Films

    Twin Athena Electric Roof Blinds

    • 3 times more fabric tension than Constant Tension Systems delivering flatter fabrics
    • No visible cords across the structural opening
    • Size parameters of 3m x 6m or 2.5m x 9m
    • Headbox 125mm wide x 105mm tall or 145mm wide x 125mm tall
    • Side profiles 54mm
    • Mains Powered Motors 35 decibels each
    • Solar Battery Powered Motors 70 decibels each
    • Dimensionally Stable Roller Fabrics that deliver on performance
    • Compatible with Somfy Tahoma Hub and automated sun sensors
    • Only the Toughest Fabrics Earn a Place in Athena Electric Roof Blind Systems – WindowTreat
    Large electric roof lantern spanning the new extension kitchen, meeting seamlessly in the middle to flood the space with natural light.
    Katherine’s Twin Athena delivering on solar heat gain reduction
    Nigel’s Twin Athena delivering high solar gain reduction in Hampshire
    Nigels Twin Athena electric roof blind in Tadley

    Hercules XL Electric Roof Blind

    • Over 8 times more fabric tension than Constant Tension Systems delivering much flatter fabrics
    • No visible cords across the structural opening
    • Size parameters of 4m x 5m or 4m x 7.5m
    • Headbox 125mm wide x 125mm tall or 200mm wide x 145mm tall
    • Side profiles 80mm
    • Motor between 47 and 54 decibels depending on loadings
    • Dimensionally Stable Roller Fabrics that deliver on performance
    • Compatible with Somfy Tahoma Hub and automated sun sensors
    Modern dining and living space with large skylight and garden views, featuring concealed roof blind integration.
    Katheryn’s 3.5m wide by 4m long Hercules XL roof blind
    Jay’s Hercules XL with Panama Chrome heat rejecting fabric
    Hercules XL electric roof blind
    Claire’s Hercules XL electric roof blind briefly in action showing taut fabric even at 3m x 7m

    Artemis External Electric Roof Blind

    • Tensioned Roof Blind System offering exceptional summer heat gain and glare control
    • Maximum width 5m x 3.75m draw
    • Anthracite Grey or White Hardware as standard
    • Somfy IO Motor
    • Side Fix and Face Fix Extendable Brackets 113mm to 170mm (allowing roof vents to open)
    • Cassette Box 180mm x 160mm
    • Side profiles 80mmm
    • Torsion Spring Engineering
    • Dimensionally Stable Roller Fabrics that deliver on performance
    • Compatible with Somfy Tahoma Hub and automated sun sensors
    External Artemis electric blind on a roof lantern.
    Andrew’s external electric roof blind shading two skylights

    Honeycomb SKY electric roof lantern blind

    • Lightweight system using 25mm cellular fabric
    • Parameters of 3000mm wide by 5000mm long
    • No visible cords within 1500mm wide by 3400mm long (otherwise visible and semi transparent cords are critical)
    • Fabric choice Dimout or Blackout
    • Transformer 251mm x 30mm x 16mm required or Battery Solar Powered
    • 25mm trim
    • Available in White, Black or Anthracite Grey as standard
    Honeycomb SKY using cords at wider and longer sizing to support the fabric

    Honeycomb SKY Cording at this width

    Visible and Semi-transparent cords to support the fabric

    Solar Film: 3M Prestige Exterior Series

    • Spectrally Selective Solar Film Innovation
    • Removes 97% of near infrared heat (uncomfortable heat)
    • Overal heat gain reduction from 45% to 66%
    • Virtually undetectable to heavier tint for glare
    • Multi layer nano technology. No metals
    • 7-year 3M backed warranty on sloping glass when installed by WindowTreat
    • Not compatibel with roof glazing with exterior self-clean coatings
    3M Prestige 70 Exterior Film offering 45% heat gain reduction
    Large shaped orangery roof lantern fitted with 3M Prestige 20 Exterior film to reduce heat and glare.
    Prestige 20 Exterior film transforms this orangery roof lantern into a cooler, more comfortable living space with 66% heat rejection

    Breakdown Of Costs To Implement The Solutions

    • Twin Athena £ 5950 inclusive of VAT and remote control handset
    • Hercules XL Electric Roof Blind £6885 inclusive of VAT and remote control handset
    • Artemis External Electric Roof Blind <4.25m x 2m £5,450 inclusive of VAT and remote control handset
    • Honeycomb Sky Battery powered electric roof blind £1925 inclusive of VAT and remote control handset
    • Manufacturing Survey £650 inclusive of VAT
    • Installation Labour team per day £1250 (allow one day)
    • Somfy Tahoma Hub / App Free Gift From WindowTreat
    • Sun Sensor £120
    • Exterior 3M Prestige Solar Films £3230 inclusive of VAT fully installed

    Example Solution Total costs = £7,970 inclusive of VAT for the survey and installation of a Twin Athena electric roof blind system including touch control device and sun sensor.

    Marketing Scheme Discount

    • £300

    You have the option to take part in our marketing scheme. In return for the £300 discount on your electric roof lantern blind, we ask for a video conversation with Steve, our General Manager, along with multiple photos or videos (sent via We Transfer) of your finished installation that we can use for marketing.

    This helps future customers understand our solutions and gives Steve valuable insight into how we can continue to improve our service. Your feedback plays a real part in shaping the experience for the next homeowner.

    Next Steps

    You now have a clear understanding of the right systems and investement costs. The next step is yours.

    You are welcome to join me on a TEAMS video call. I can take you through this solution in more detail, answer your questions, address any concerns and potentially look at alternative options if need be.

    Available times are shown in my diary at the end of this article.

    Supporting Links

    The Journey To Your Electric Roof Lantern Blind – WindowTreat

    Most Roof Lantern Blinds Sag. Here’s Why.

    How much do electric roof lantern blinds actually cost? (No hidden surprises) – WindowTreat

    WindowTreat Automated Shading Systems Terms & Conditions – WindowTreat

    Twin Athena Roof Blind Systems

    Only the Toughest Fabrics Earn a Place in Athena Electric Roof Blind Systems – WindowTreat

    How Saving Nigel’s Dream Space Launched S.H.A.D.E for Architecturally Designed Builds – WindowTreat

    Hercules XL Roof Blind System

    Success Story: Kathryn’s Hercules XL Roof Blind Transformation – WindowTreat

    How Claire Transformed Her Orangery with Hercules – WindowTreat

    Jay | Hercules Electric Roof Lantern Blind | WindowTreat

    3M Solar Control Window Films

    Success Story Window Film Mark – WindowTreat

    Why Internal Solar Control Films Struggle on Modern Double Glazing – WindowTreat


    Author: Chris Gargett, Co-Founder - Director of Solutions & Operations
    Chris Gargett

    Chris is the lead technical specialist who personally guides homeowners from initial consultation to final installation, ensuring every shading solution seamlessly integrates with the architecture to preserve your dream home.

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