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Flat Rooflight | Cheap Sale Price!

Price range: £259.00 through £2,800.00 ex. VAT £310.80 inc. VAT

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25% Discount, ending soon! First 10 sizes Clear option with or without self-clean 2-5 WORKING days delivery. Please note size selected above is the internal bottom pane glass size. To reduce excessive solar heat build-up, reduce glare and provide additional UV protection we highly recommend our BLUE or GREY tint glass.
Made to order
Custom SizeBi-Fold & Sliding Doors
Easy fit!
Made to Measure - Made in UK
Exceptional Thermal Performance
Price Match Guarantee for like for like product
Argon gas filled Toughened Glass
Solar Protection, Noise Reduction

Transform your space with our stunning bespoke flat rooflights. 

Designed to flood your space with natural light, flat rooflights open up any room, creating a warm, inviting atmosphere year-round.

Enjoy expansive sky views, a closer connection to nature, and sleek, contemporary design – perfect for a space that inspires calm and comfort.

Get yours today in a custom size and enjoy Fast UK Delivery and our Best Price Guarantee.

You can also view our wider range of flat roof windows, or learn more about flat roofs and rooflights in our helpful guides below:

 

What are the benefits of flat skylights?

  • Brighter, more inviting spaces: Flat roof skylights let in up to twice as much light as vertical windows, creating brighter, more welcoming rooms and supporting better mood, focus, and wellbeing. Discover the benefits of natural light.
  • Modern, stylish design: Sleek and contemporary, our skylights refresh your home’s look and create spaces you’ll enjoy spending time in.
  • All-weather reliability: Built with high-quality materials, our rooflights are durable, energy-efficient, and made to your exact specifications to meet building regulations.
  • Boosted property value: Homes with spacious, light-filled rooms are more attractive to buyers, often increasing resale value.
  • Peaceful indoor environment: Acoustic insulation helps keep outdoor noise out, making your home quieter and more relaxing.
  • Make your room feel more spacious: Flat rooflights open up your space for a home that feels bigger, calmer, and less cluttered. Learn more ways to make a room look bigger.
  • Triple-glazing benefits: Triple-glazed options mean superior insulation, lower energy bills, and enhanced security. View our blog on triple-glazing vs double-glazing.

 

Where can you install a flat rooflight?

  • Living room: Brighten your main social space with plenty of natural light.
  • Kitchen: Make cooking and dining areas feel fresher and more spacious.
  • Bedroom: Wake up to natural daylight for a healthier, happier start.
  • Bathroom: Add light without compromising privacy or ventilation.
  • Garage: Light up your parking or storage area without needing electric lights.
  • Outbuilding (e.g., garden office or shed): Create a bright, comfortable workspace or hobby room.
  • Single-storey extensions: Bring daylight into your new home addition to make it feel bigger.
  • Commercial building (offices, shops, etc.): Enhance staff productivity and create a welcoming environment.
  • Any space needing more natural light: Perfect for dark hallways, utility rooms, or enclosed spaces.

 

Why choose Toughened Glass Systems?

We are flat roof window experts with years of experience in the industry. View our testimonials to see what our customers had to say about us, or read on for some key reasons to buy your flat rooflight from us:

  • Independent testing: Our flat roof skylight system meets RVA-accredited standards for Air Permeability (EN12207) and Water Tightness (EN12208) when installed according to our guide.
  • More light: The visible bottom pane size shown is smaller than the total glass area—the top pane is 100mm larger all around, letting in more light than competitors’ smaller visible glass.
  • Price match guarantee: We promise to match prices from any UK retailer to ensure you get the best deal.
  • High-quality materials: Manufactured using premium materials from trusted suppliers like Pilkington, delivering attractive design and excellent thermal performance for energy efficiency.

 

More flat rooflights

We stock a range of products similar to this flat rooflight, including:

View our full collection of rooflights and roof windows for even more great features

FAQs

What type of skylight is best for a flat roof?

Popular options include:

  • Flat Roof Windows: Windows designed to be installed flush with flat roofs, providing natural light and views while maintaining a sleek, low-profile appearance.
  • Fixed Rooflights: Non-opening skylights that flood interiors with natural light without ventilation.
  • Roof Lanterns: Elevated structures that sit above flat or pitched roofs, creating a striking architectural feature and flooding spaces with light.
  • Pyramid Rooflights: Rooflights shaped like a pyramid, designed to maximise light intake and add a distinctive geometric aesthetic.
  • Opening Rooflights: Skylights that can be opened to provide ventilation as well as natural light.
  • Dome Rooflights: Curved, dome-shaped rooflights that maximise light and offer durability and weather resistance.

Our flat rooflight is our most popular product, trusted by homeowners and business owners alike for its versatility and performance.

How much does a flat roof skylight cost?

The price of your flat rooflight will depend on a range of factors, including size, glazing, finish, and whether you opt for any additional features.

We offer flat rooflights for as little as £285.60 inc. VAT, representing fantastic value for money.

What is the difference between a roof lantern and a flat roof light?

The main difference between flat rooflights and roof lanterns is that rooflights have a much lower profile. In other words, it won’t stand out much above the roofline. That means in turn that installing a flat glass rooflight doesn’t change the external appearance of the building as much.

View our helpful article on the key differences between roof lanterns and rooflights for more information.

Measuring & Installation Guide

Easy fit

Installation

Our roof light rooflight installation can easily be undertaken by competent builders/roofers and we provide simple step by step fitting guide and technical support to facilitate installation.
The Rooflight supplied can be installed directly on the Insulated Upstand supported by an anodized aluminium angle trim all around, supplied by the builder or roofer.

All information and diagrams on this page are for guidance only to install the rooflight we supply as each project may vary in design/construction as per architects’ drawings. Upstand design and dimensions can vary based on architects approved drawings and insulation requirements. The rooflight can be custom made to suit wider upstands with bigger than 100mm overhangs if required at additional cost.

Installation and Measuring Guide

Our rooflight installation can easily be undertaken by competent builders and roofers. We provide simple step by step fitting guide. For technical support please contact 0203 633 3224.
1. Measure the opening
2. Preparing your roof
3. Installing the rooflight

Measure the opening

The first step in purchasing your rooflight would be to measure the structural opening where the rooflight will be installed. You should allow for 5mm tolerances all around to allow the bottom pane of the rooflight to fit smoothly into the opening. As an example, if your tight opening measurements are 1010mm by 1010mm we would recommend you purchase a rooflight with a bottom pane of 1000mm by 1000mm so it slots in smoothly.

For standard units the top pane would have a black 100mm overhang all around on the top pane. This would make the overall size of the top pane 1200mm by 1200mm in this example. We can increase the size of the overhang if required if the upstand width is wider. The diagram below shows the sectional view of a double-glazed installed rooflight.

Preparing your roof

Structural glazing silicone is used to bond the double/triple glazed sealed units to the top pane to form a rooflight. The rooflight IGU is simply secured onto the timber kerb built by your roofer/builder as part of the roof construction.
The timber upstand should protrude 150mm above the roof.  The recommended minimum pitch is be 5 degrees, sufficient to allow water to flow down. Sometimes customer may require installing at a lower than the recommended pitch.  If choosing to do this, then we strongly advise pouring water over the top of the skylight to ensure the flow of the water is smoothly off the unit before the rooflight is installed.  The only purpose of the skylight pitch is so the maximum efficiency of the self-clean coating is utilised (if selected) along with water and dirt to drift off.  When installed completely flat with no pitch then the water could pool on the top of the rooflight glass which won’t affect the performance or cause leaking. You may be able to see visible water when looking up at the skylight due to the lower pitch, however the warranty is still valid, but you may notice water pooling when looking up.

Installing the rooflight

The final step to finish the roof before installing the rooflight is to apply your roof covering up to the side of the upstand to make it weatherproof as illustrated below.
The timber upstand should protrude at least 150mm above the roof and the pitch should be 5 degrees, sufficient to allow water to flow down. Please note self-clean option only works effectively at pitches of 10 degrees and above. Before sealing the product with silicone, water can be applied to test the flow off of water, if pooling occurs a higher pitch may be required.

Bottom pane should be supported on 4 sides once set in place, the aluminium angle can be fitted before the plasterboard and covered with plasterboard or fitted after the plaster board. Alternatively, a timber batten with aluminium strip on the top can be fitted to support the rooflight.

Apply adequate recommended silicone as per silicone supplier’s data sheet to the top of the Upstand firmly placing the rooflight onto the upstand. Pressure should be applied all around the 100mm overhang to ensure the silicone spreads and seals any gaps and then finish off the silicone all around with silicone tool. Once cured apply structural silicone as per supplier’s data sheet to the bottom aluminium angle trim flat surfaces firmly fitting them in place. Excess silicone should then be wiped away with a finishing tool. Dowsil 791 low modulus weather proofing silicone and Dowsil 895 Structural sealant are compatible and must be used. Setting blocks can be used to achieve sealant thickness required.
At this stage the bottom and top panes should be supported. Sealants compatible with the top of the upstand, aluminium angle trim, glass, setting blocks must be used. Sealant suppliers may require primer to be applied to certain surfaces.

Please note all rooflights are made to order and sizes can not be changed once glass is cut or toughened. We recommend the speciation, sizes and instructions are reviewed and understood by the installer before proceeding with an order.

Technical Information

Building regs and performance

The rooflight Stepped Insulated Glazed Units (IGU’s) we supply are suitable for single storey flat roof extensions to existing residential dwellings. As each project can vary with requirements, we suggest confirming building regulation requirements for the product with the architect, builder or building officer prior to placing an order to ensure compliance. The installer or buyer should ensure that a risk assessment is carried out to confirm the product’s suitability for the project. Depending on the application, the rooflight may need to meet specific requirements, for example, it may need to be obscure, include a larger upstand, be suitable for foot traffic, or use laminated glass. For example, if the rooflights are positioned more than 5 metres above floor level, or located above swimming pools, laminated glass will be required.

Please note that the standard rooflight is supplied with toughened glass for both the internal and external panes. If laminated glass or any other specification is required, this can be provided upon request and quoted accordingly. Please note additional care needs to be taken during installation when laminated stepped rooflights are supplied, foam rope would be required to level off any discrepancies which will prevent any pressure and stop cracking on the bottom glass laminated pane.

Laminated glass consists of two panes bonded together with a plastic interlayer that holds the glass in place if broken. Toughened glass, by contrast, is a single pane that has been heat-treated and rapidly cooled to increase its strength; when broken, it shatters into small, blunt fragments. Toughened glass is a type of safety glass. While toughened glass offers greater strength and impact resistance, laminated glass provides enhanced safety and security by remaining intact after breakage.

 

Standard units

Our standard units are double glazed with clear toughened glass top pane manufactured to BS EN 12150 and conform to BS EN 1279, 18mm argon-fill cavity structurally sealed with toughened Low-E glass to achieve a centre pane 1.1 u-value. Glass thickness for standard size units are 6mm toughened. Glass speciation and thickness will vary for larger units.

Triple and quad glazed units

Our triple and quad glazed options provide even higher performance ratings. 1.6 minimum U-value rating is currently required to comply with building regulations. The solar control layer prevents heat escaping and reflects interior heat back into the room

TGS Skylight Thermal Ratings

Optional Extras

Coloured boarders – If required we can paint any RAL colour to the boarder which is usually 100mm wide all around.

Pilkington Activ self cleaning glass – Applied coating breaks down dirt and washes away with rain water.

Pilkington Activ blue self cleaning glass – In addition to self cleaning properties the blue tint provides additional solar control performance by keeping internal temperatures cool whilst maintaining light transmission

Triple glazed skylights – achieving 0.9 centre pane U Value rating.

Privacy glass – We can apply a sandblasted frosted layer to make the skylight obscure.

Warranty

The product is supplied with a manufacturer’s warranty. For warranty terms please see our terms and conditions.

Delivery & Lead Time

Double and Triple glazed clear with or without self-clean in sizes below can be made and delivered within 2-5 working days.

1000mm x 1000mm
1000mm x 1500mm
1000mm x 2000mm
600mm x 900mm
600mm x 1200mm
800mm x 1800mm
800mm x 800mm
800mm x 1300mm
400mm x 700mm
400mm x 1000mm

Standard manufacturing lead time for other size and specification flat roof skylights is 7–10 working days in the London/M25 and surrounding area depending on the specification. Delivery will be made from 7am to 6pm We provide a delivery date within 3 days of processing the sale. Delivery in other areas 7-12 working days.  This item is delivered unpackaged on a glazing vehicle so that it can be easily inspected on delivery. You would need to ensure sufficient labour is made available on site to off load the glass from the vehicle as the the driver arrives alone and not insured to off load. Healthy and safety regulations recommend 25kg lift per person. National delivery lead times will vary.

Third party transport only deliver in each area on specific days of the week. We do not recommenced arranging equipment and installation until the item has been delivered.

Delivery charges on the website apply to postcodes and counties below. If delivery is outside of these postcodes/counties, please contact us.

B, BH, BN, BR, BS, CM, CO, CR, CT, CV, DA, E, EC1, EN, GL, GU, HA, HP, IG, KT, LE, LU, ME, MK, N, NN, NP, NW, OX, PE, RH, RG, RM, SS, SG, SL, SN, SM, SE, SO, SP, SW, TN, TW, W, WD, WS, WV, UB, AL, BA, WC1, IP, NG, CB, CF, DE, LS,WF,HX,HD , BL, CH,CW, DN, DT, DY, EX, HD, HR, HU, HX, L,LN,LS,M, NR,OL, S ,SK ,ST ,TA ,TF ,WA ,WF ,WN ,WR ,BD1 ,BD10 ,BD15 ,BD13 ,BD14 ,BD12 ,BD11 ,BD19 ,BD2 ,BD3 ,BD4 ,BD5 ,BD6 ,BD7 ,BD8 ,BD9 ,BD16,BD17, PO (exc I.O.W)

Essex, Kent, East Sussex, West Sussex, Hampshire, Gloucestershire, Surrey, Buckinghamshire, Oxfordshire, London, Middlesex, Hertfordshire, Bedfordshire, Northamptonshire, Leicestershire, Warwickshire, West Midlands, Nottinghamshire, Suffolk, Derbyshire, Cardiff, Cambridgeshire, Devon, Somerset, East Riding, Lincolnshire, Norfolk, Cheshire, Merseyside, Greater Manchester, south Yorkshire, Staffordshire, Rutland, Wiltshire, Worcester, Herefordshire, Dorset, West Yorkshire (BD, LS, WF, HX, HD limited postcodes)

Delivery to TQ, PL and TR postcodes will incur a higher delivery charge £150 plus vat and slightly extended delivery lead time.

 

Deliveries to postcodes and counties below may take up to 4 working days longer compared to our standard delivery lead times shown above:

Aberdeenshire, Angus, argyll, Carmarthenshire, Ceredigion, County Durham, Dumfries, Durham, East Lothian, East Riding, Edinburgh, Fife, Glasgow, Highland, Kinross, Midlothian, Moray, Neath Port Talbot, Ayrshire, Lanarkshire, North Yorkshire, Northumberland, Orkney, Pembrokeshire, Perth and Kinross, Powys, Renfrewshire, Scottish border, Shropshire, Stirling, Swansea, Dunbartonshire, West Lothian, Clackmannanshire, Lancashire, Cumbria

TS,FY,PR,BB,YO,FK,G,ML,DG,TD,NE,CA,DL,DH,SR,EH,KA,KY,LA,LD,PA,SA,SY,TA,AB,DD,IV,KW,PH, LL

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