A flat skylight is one of the simplest ways to bring more natural light into an extension, hallway, or any room that feels dark or enclosed. At Toughened Glass Systems, we offer a range of flat roof rooflights designed to improve efficiency, aesthetics, and create more comfortable living spaces.
Below, you’ll find an overview of our most popular options, including key specifications to help you compare styles, glazing types, and performance features at a glance.
Flat Roof Skylight (Fixed Flat Rooflight)
This custom-made frameless flat roof skylight is designed to fill your space with natural light while adding a modern touch to your home. With a less visible framework and a glass-dominant look, it mixes easily into contemporary interiors. Installed onto a builder’s upstand, it delivers brilliant sky views and creates a brighter feel throughout the year.
Technical: Frameless design (supported by an aluminium angle trim) with double-glazed toughened glass as standard (argon-filled cavity) or optional triple glazing for higher performance.
Warranty: Supplied with a manufacturer’s warranty (standard coverage under TGS terms)
Delivery: Fast turnaround on popular sizes, many clear double/triple units can arrive in 2–5 working days. Other custom sizes typically deliver in 7–12 working days, depending on location. (Nationwide delivery available, with extra care for large glass panes.)
Sizes: Wide range of made-to-order sizes from approximately 400 × 700 mm up to 1000 × 4000 mm (internal pane dimensions). This covers very small skylights through long-span panels 4 m in length.
Price: Budget-friendly pricing, starting around £259 ex. VAT for the smallest units and ranging up to roughly £2,800 ex. VAT for the largest standard sizes (approximately £311–£3,360 inc. VAT). This flat rooflight offers one of the best value options for a custom-sized skylight.
Triple-Glazed Self-Clean Rooflight
A premium triple-glazed flat roof skylight with self-cleaning glass for the best performance. This unit uses both an extra pane of glass for superior insulation with a special UV-responsive coating that keeps the glass clearer over time. It’s ideal for homeowners searching for energy efficiency, less maintenance, and crystal-clear sky views.
Technical: Frameless triple-glazed unit with toughened safety glass panes and a photocatalytic self-clean coating. The design blocks UV and includes argon gas cavities for thermal efficiency. Offers an excellent U-value of 0.9 W/m²K (centre-pane) thanks to the triple-pane construction. The glass is also UV-protected and noise-reducing for comfort.
Warranty: 20-year manufacturer’s warranty, well above industry standard. (This long warranty reflects the confidence in the unit’s build quality and durability.)
Delivery: Very quick dispatch, 1–3 working days for most areas (slightly longer, ~5 days, for Scotland and remote regions). Nationwide mainland UK delivery is available, with safe handling procedures for the heavy triple-glazed unit.
Sizes: Available in standard sizes from about 600 × 600 mm up to 1000 × 3000 mm. For example, common options include 600×900, 1200×1200, 1500×1500, and up to long panels 1000×3000 mm. All units are made to order, and bespoke sizes can be produced on request.
Price: Very competitive for triple-glazed glass, prices range from roughly £163 up to £619 ex. VAT (approx. £196–£743 inc. VAT) depending on size.
Framed Rooflight TGS (Aluminium)
The Framed Rooflight TGS is a custom aluminium-framed flat skylight that mixes strength with style. It brings in abundant daylight through its insulated glass, while a slim frame adds a new touch. This rooflight is ideal when a flush, framed look is desired, perfect for new builds or retrofits seeking an easy, thermally efficient skylight solution.
Technical: Thermally broken aluminium frame with a slim sight line and internal thermal break to prevent condensation. Glazing can be double or triple: a double-glazed unit offers 1.2 W/m²K U-value, while the triple-glazed option achieves 0.7 W/m²K for insulation (about 30% better than standard double).
Warranty: Backed by a 10-year manufacturer’s warranty for the rooflight system. This covers the frame and sealed glass unit against manufacturing defects (ensuring long-term peace of mind).
Delivery: Fast delivery on standard sizes, the first 10 listed sizes (clear glass) typically ship in 2–5 working days. Custom sizes or non-standard specs have a lead time of around 5–10 working days. (All units are made to order in the UK; a delivery date is confirmed shortly after ordering. Ensure on-site labour to assist with off-loading large units.)
Sizes: Wide selection from 600 × 600 mm small skylights up to 3000 × 1500 mm. Common sizes (in mm) include 900×900, 1200×1200, 1500×1000, 2000×1500, and up to expansive 3000×1500 panels. Units can be installed on flat roofs up to 45° pitch (fixed, non-opening). Bespoke dimensions and custom configurations are also offered.
Price: Moderate pricing given the high specs, starting around £350 ex. VAT for smaller sizes to roughly £2,733 ex. VAT for the largest standard size (about £420–£3,279 inc. VAT). This includes options like self-clean or tints (which can be added without significantly increasing lead time).
Korniche Flat Lite
A slim, quality flat glass rooflight that brings daylight into any room. Korniche Flat Lite uses a minimal, thermally efficient frame, so the glass area looks larger and the overall profile stays neat. It’s made in the UK and meets PAS24 security standards as standard, giving peace of mind for homes or light commercial spaces. Typical installations are for extensions, kitchens, living areas, or any space that needs a rooflight that still performs well in the UK climate.
Technical: Choose double‑ or triple‑glazed toughened glass, also offered in clear or blue‑tint options. This lets buyers balance cost vs efficiency and solar control. Built to the PAS24 security standard, designed for better protection against threats. The system uses engineering to control sealant depth and improve long‑term weather performance, reducing the risk of seal issues in changing temperatures.
Warranty: Supplied with a 10‑year manufacturer’s warranty, covering the product for long‑term use, in line with Korniche’s UK‑made quality.
Delivery: Made to order; standard lead time is 7–10 working days for all sizes and glazing options listed on the site. Labour needs to be on site to accept and offload the rooflight from the vehicle.
Sizes: Offered across a broad selection of ready sizes, from compact to quite large, to suit many roof openings. Examples listed include 400 × 700 mm up to 1000 × 2700 mm, covering small openings to long linear skylights.
Price: Reflecting its UK manufacture and optional extras, pricing starts from £109.50 ex. VAT and goes to £875.10 ex. VAT depends on size and choices. This keeps the product accessible for tighter budgets while still offering security and glazing variety.
Framed Flat Skylight (Laminated Inner Pane)
A high-spec framed flat skylight that prioritises safety and efficiency. This TGS skylight features an internal laminated glass pane for added security (unlike many competitors’ all-toughened units). It provides natural light through a low-profile aluminium frame, making it ideal for homeowners who want a secure rooflight without compromising on light or aesthetics.
Technical: Built with a powder-coated aluminium frame that is fully thermally broken to eliminate cold bridging and condensation. Glazing is double-glazed insulated glass: a toughened outer pane and a laminated inner pane (6.4 mm minimum thickness, increasing to 9.5 mm or 11.5 mm for larger sizes).
Warranty: Provides a 10-year guarantee on the rooflight (and an expected service life of 20 years). The sealed glass unit itself is typically warranted for 5 years against seal failure; however, the product is guaranteed for a decade of performance (with regular maintenance).
Delivery: Many popular sizes are in stock for 2–3 working day delivery (for clear Low-E glass units). Mid-sized units ship in roughly 5 working days. All other sizes (and custom specs) usually have a 2–3 week lead time.
Sizes: Extensive range of standard sizes from 600 × 600 mm up to 3000 × 1800 mm. Notable available dimensions include 900×900, 1200×1200, 1500×1500, 2000×1000, 2400×1200, 3000×1200, 3000×1650, 3000×1800, etc. Custom sizes outside this range can often be accommodated on request.
Price: Mid-range cost, reflecting its upgraded specs. Prices run from about £390.96 ex. VAT for the smallest (0.6×0.6 m) up to around £3,309.82 ex. VAT for the largest 3 × 1.8 m unit (approximately £469–£3,972 inc. VAT). Considering the included laminated safety glass and high insulation, this skylight offers great value and often undercuts similar products from competitors.
Coxdome Flat Glass Rooflight (Lumiglaze)
The Coxdome Lumiglaze Flat Glass Rooflight is a fully-finished flat roof window system that includes an integrated PVC upstand for quick installation. It provides an uninterrupted glass view and exterior profile. Coxdome rooflights are known for being “plug-and-play” units, simply flash the supplied upstand into your roof. They are a cost-effective alternative to other modular skylights, delivering lots of daylight with minimal effort to install.
Technical: Constructed with an aluminium frame and PVC kerb (160 mm high upstand) that is thermally broken for insulation. The glazing is double-glazed: a toughened outer pane with ceramic edge coating for a black border, and a laminated inner pane for safety.
Warranty: Backed by a 10-year manufacturer’s warranty from Coxdome, covering the sealed glass and upstand. (This matches industry norms and underscores the product’s quality. The warranty ensures the unit will remain weathertight and structurally sound for at least a decade.)
Delivery: Generally fast, current lead time is about 3–5 working days for all sizes of this product. This quick delivery, combined with the included upstand, means projects can be completed swiftly. Customers should have labour ready to receive and install, as the unit is delivered on a pallet curbside.
Sizes: Offered in a set of standard sizes, defined by overall glass dimensions from 750 × 750 mm up to 1350 × 2350 mm. (These correspond to roughly 600×600 up to 1150×2150 mm roof opening sizes, since the glass overhangs the upstand by ~100 mm per side.) Common sizes include 750×1050, 1050×1050, 1050×1350, 1150×1650, 1150×2150, etc. All units come with the factory-finished PVC upstand for those exact dimensions.
Price: Affordable turnkey package, pricing for the fixed Coxdome Lumiglaze ranges approximately from £528 up to £1,526 ex. VAT (about £634–£1,832 inc. VAT) depending on size. This one price includes the upstand, laminated glazing, and all components, making it very competitive.
Walk-On Rooflights (Load-Bearing Glass)
Walk-on rooflights are heavy-duty glass skylights designed to be installed flush with flooring or decking, creating a window you can literally walk on. TGS Walk-On Rooflights are great for roof terraces, balconies, or above basements, basically anywhere you want to drive light into the space below while still using the surface above.
Technical: These units are essentially strong stepped-edge insulated glass units with no traditional frame (the glass lies on a supporting upstand). Standard construction is double-glazed: a very thick toughened top pane (about 33 mm) to carry foot traffic, an 18 mm argon gap, and a toughened Low-E laminated bottom pane for insulation and safety.
Warranty: Covered by the manufacturer’s standard warranty (TGS), generally a 10-year warranty on the sealed unit and structure. (As with other TGS rooflights, terms are per their conditions. The long expected life is comparable to fixed rooflights, with proper installation ensuring it remains watertight and safe.)
Delivery: Made to order in 3–5 weeks due to the specialised nature. Standard lead time is 15–20 working days in the London/M25 area and about 15–23 working days for other regions. Delivery is via a glazing freight vehicle, with free delivery in London (and charges to other areas).
Sizes: Standard offerings range from approximately 600 × 900 mm up to 1000 × 3000 mm (clear bottom pane size). For instance, common sizes include 600×1200, 900×1200, 1000×1000, 1000×1500, 1000×2000, up to a large 1×3 meter panel. The top pane extends 100 mm beyond on each side.
Price: Pricing reflects the heavy-duty nature, ranging roughly from £869 ex. VAT for the smaller units to about £3,575 ex. VAT for the largest standard size (approximately £1,043–£4,290 inc. VAT). This includes the base configuration (clear double-glazed walkable glass). Optional features like anti-slip or privacy finish will add to the cost.
Modular Fixed Rooflights (Glass Link Modules)
Modular rooflights are a system of multiple glass panels joined seamlessly to illuminate very large areas. TGS offers a Mardome Glass-Link Modular Rooflight system, which allows several flat glass modules to be linked in series for an expansive skylight. This is ideal for commercial buildings, offices, schools or homes where a single skylight spanning beyond the limits of one glass pane is needed.
Technical: The system consists of factory-glazed double-glass modules with fully thermally broken aluminium frames. Each module has a powder-coated anthracite grey external frame and an inner laminated glass pane for safety.
Warranty: Robust warranty similar to other high-end units, 10-year guarantee on the modular rooflight system, with an expected lifespan of 20+ years. The sealed glass units are usually warranted for 5 years against seal failure.
Delivery: Longer lead time: 4–6 weeks for manufacturing and delivery. This accounts for design approval, custom fabrication of multiple modules, and scheduling of transport.
Sizes: A very broad range of configurations. The price list covers modules for external upstand sizes from 2000 × 1500 mm up to 6000 × 3000 mm for an individual module. Notable standard module sizes include 3×3 m, 4×3 m, 5×3 m, and up to 6×3 m single sections. Additionally, narrower modules like 3500×1000, 4500×1500, etc., are available to mix and match.
Price: High-end investment, reflecting the sheer size and complexity. Prices for single modules range from about £2,185 ex. VAT (smallest 2×1.5 m) up to £14,502 ex. VAT for a very large 6×3 m module (approx £2,622–£17,402 inc. VAT for single modules). A complete multi-module installation will scale up from there.
Comparison Table: Key Features of TGS Flat Roof Rooflights
| Product | Frame Material | Glazing & U-Value | Sizes (WxL) | Warranty |
| Flat Roof Skylight | Frameless (minimal trim) | Double or Triple; U≈1.1 (dbl), 0.9 (trpl) | 400×700 mm to 1000×4000 mm | Manufacturer’s (std) |
| Triple-Glazed Self-Clean | Frameless (glass unit) | Triple-glazed w/ self-clean; U≈0.9 W/m²K | 600×600 mm to 1000×3000 mm | 20-year manuf. |
| Framed Rooflight TGS | Thermally broken Aluminium | Double or Triple; U≈1.2 (dbl), 0.7 (trpl) | 600×600 mm to 3000×1500 mm | 10-year manuf. |
| Korniche Flat Lite | Aluminium frame + bonded flat glass | Double glazing (28mm) 1.5 W/m²KTriple glazing (44mm) ≈1.0 W/m²K | 400 × 700 mm up to 1000 × 2000 mm | 10 years manuf. |
| Framed Flat Skylight | Thermally broken Aluminium | Double (toughened + laminated); U≈1.1 W/m²K | 600×600 mm to 3000×1800 mm | 10-year (20-yr design) |
| Coxdome Flat Glass | Alu/PVC upstand unit | Double (toughened + laminated); U≈1.0 W/m²K | 750×750 mm to 1350×2350 mm | 10-year manuf. |
| Walk-On Rooflight | Frameless (struct. glass) | Double (33mm walkable top + lam inner); U≈1.1 W/m²K | 600×900 mm to 1000×3000 mm | Manufacturer’s (std) |
| Modular Rooflights | Thermally broken Alu | Double (toughened + lam panels); Low-U (energy efficient) | Modules: 2000×1500 up to 6000×3000 mm each | 10-year (20-yr design) |
Choosing the Right Rooflight for Your Project
Toughened Glass Systems brings you a broad selection of flat roof-lights that really do strike a great balance between looking good, performing well, and being practical. You can choose from budget-friendly options like the Flat Roof Skylight right up to high-end designs like the Korniche Flat Lite, and some really clever glass link systems. Every one of them has been carefully thought out and then backed up with a reliable delivery service from the UK.
Every roof-light is designed with real-world needs in mind, it’s all about bringing in loads more natural light, saving on energy costs and giving your space a clean, modern look. Because they come in all sorts of sizes and have clear technical information readily available, finding the perfect one for your project is easy. You can get the perfect fit without having to scrimp on quality.