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Frameless rooflight

Frameless flat rooflights

Create a simple view of the sky with a fixed rooflight and an unobtrusive glass edge. Plan the opening, supporting kerb and glazing together for a clean finish above your room.

Product guide

Frameless flat rooflights

Create a simple view of the sky with a fixed rooflight and an unobtrusive glass edge. Plan the opening, supporting kerb and glazing together for a clean finish above your room.

An illustrative view of daylight through a modest flat rooflight in a kitchen extension.
AI-generated illustration. Appearance varies by specification; this is not an exact product sample.

Frameless flat rooflights: design and installation choices

Create a simple view of the sky with a fixed rooflight and an unobtrusive glass edge. Plan the opening, supporting kerb and glazing together for a clean finish above your room.

A fixed flat rooflight brings overhead daylight through a low-profile glazed opening. A framed product and a frameless-style product have different perimeter details. Both need compatible support and waterproofing. Neither a subtle glass edge nor a slim frame removes the need for a complete installation design.

Consider the room's orientation, maintenance access and the balance between daylight, privacy and solar heat. Request the exact glazing make-up and glass-only or whole-product performance required by the project. Standard dimensions, roof pitch and installation details belong to a particular system, rather than to roof glazing in general.

Frameless flat rooflights for your project

Common enquiry briefs include kitchen extension, living or dining extension, minimal-frame roof glazing, replacement rooflight. Describe the intended use and the supporting construction so the supplier can assess the complete specification. Different applications can need different glass processing, fixings and installation details.

A simple glass perimeter

A polished edge and decorative border can give a less prominent perimeter. Agree the visible detail and sample before ordering.

Plan support and waterproofing

A frameless appearance still needs a designed support and protected edge seal. The finished kerb and roof membrane are part of that detail.

Choose your glazing

Request double or triple glazing and a clear, solar-control or satin appearance. The final glass build must suit the overhead location and supporting system.

What to include in a made-to-measure quote

Compare quotes using the same dimensions, quantities, finish, glass construction and installation scope. If you have a drawing or an existing specification, include its reference and identify which details still need advice.

  • What do your dimensions describe?: Opening, kerb, frame and glass sizes are different. Record the reference you measured; the supplier will agree the manufacturing size.
  • Glazing preference: An exact pane and cavity schedule will be agreed for the supplied rooflight.
  • Glass appearance: Solar control and privacy are different requirements. Ask for a sample and the light transmission and solar factor for the proposed glass.
  • Overhead glass specification: The complete build and intended location determine the safety specification. Include any designer's requirements in the notes.
  • Thermal and solar performance: Glass-only and whole-product U-values are different. Put target values and their assessment basis in the notes.
  • Roof and supporting kerb: Describe the roof fall, finished kerb width and height, membrane and supporting construction in the notes.
  • Daylight or ventilation?: This product is fixed. If it needs to open, request a separate opening-system proposal.
  • Supply and installation: Tell us about roof height, site access, lifting and waterproofing in the project notes.
  • Perimeter and edge detail: Frameless appearance still needs support, border coverage and protection for the insulating-glass edge seal.

Opening dimensions, kerbs and roof glazing

Record whether you measured the internal clear opening, external finished kerb, frame or existing glass. These are different references. Rooflight size charts and lantern ordering drawings must not be interchanged; the supplier agrees the manufacturing dimensions for the chosen system.

Holes, cut-outs, shaped edges and interfaces with hardware should be settled before manufacture. The finished glass construction and any coatings must suit the intended environment. A screen preview or concept photograph cannot replace a sample, survey or product-specific installation drawing.

Supplier checks before manufacture

  • Confirm the dimension reference before manufacture. The researched size chart uses internal opening dimensions; do not use these as external frame or glass sizes.
  • Agree the supporting kerb, roof fall, border coverage, edge protection and waterproofing using the supplied system’s current drawing.
  • Confirm the exact overhead safety build, thermal performance and site wind and snow requirements. This fixed rooflight is not a walk-on product.
  • Use the frameless system’s own installation drawing; framed profile dimensions must not be transferred to it.

Requesting comparable glass quotes

Save the choices you know and ask for help with the rest. The quote basket records a specification request rather than placing a manufacturing order. A firm quote needs an agreed final build, dimensions, delivery arrangements and any installation or design work.

When comparing proposals, check that glass-only supply and supply with fitting cover the same scope. Ask who provides measurement, drawings, supports, compatible hardware, lifting access and finishing work. Keep the final approved specification with the order.

Sources and further reading

Configure your roof glazing ↓Help me chooseSee the research

Guided specification · Save multiple sizes · Supplier-confirmed quotes

An illustrative view of daylight through a modest flat rooflight in a kitchen extension.
AI-generated illustration. Flat-roof glazing concept; the frame, edge detail and appearance vary by design.

Your glass, step by step

Build your specification

Choose what you know. Leave the rest for a supplier to advise. Add different sizes as separate basket lines.

No account needed to configure
1. Your project

1What are you making?

2. Glass and performance

2Choose the details

Examples and guidanceRoof glazing, kerb reference and weathering

Opening, kerb, frame and glass sizes are different. Record the reference you measured; the supplier will agree the manufacturing size.

Rooflight section referencesConcept section distinguishes roof opening, supporting kerb and roof glazing. No waterproofing detail or build-up prescribed.What do your dimensions describe?Illustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

Opening size, kerb size, frame size and glazing size are different dimensions. Use the supplied roof system’s stated measurement basis and section drawing before manufacture.

Confirm roof fall, upstand or kerb, drainage, edge cover, weathering and the specified overhead safety glazing. Opening systems also need operating clearances and controls; an ordinary rooflight is not automatically walk-on glazing.

Examples you may seeMark whether dimensions describe the opening or external kerb.Request the manufacturer’s installation drawing for the actual product.Available choices: Help me choose; Internal clear opening; External finished kerb; Existing frame — replacement reference; Existing glass — replacement reference; Dimensioned drawing — reference in notes.Current choice: Help me choose. This is your request for the supplier to confirm.Flow application concept of a modest fixed flat rooflight with a dark perimeter and solid ceiling around itAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: GlassTime technical handbook (opens in a new tab) ↗

Opening, kerb, frame and glass sizes are different. Record the reference you measured; the supplier will agree the manufacturing size.

Examples and guidanceSealed-unit panes, cavities and edge seal

An exact pane and cavity schedule will be agreed for the supplied rooflight.

Insulating glass unit sectionTwo separate panes around a sealed cavity; a perimeter spacer and edge seal sit between the panes at the bottom edge.Glazing preferenceIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

An insulating glass unit has separate glass panes around one or more sealed cavities. At the perimeter, a spacer maintains separation, with the specified edge-seal system closing the unit. The cavity contains the specified dry air or gas.

A double-glazed unit has two panes and one cavity; a triple-glazed unit has three panes and two cavities. Specify pane types and treatments, cavity widths, spacer, gas and seal compatibility separately.

Examples you may seeA 4 / 16 / 4 example totals 24 mm: 4 mm pane, 16 mm cavity, 4 mm pane.A laminated pane within a sealed unit has its own bonded make-up in addition to the unit cavity.Available choices: Help me choose; Double glazing; Triple glazing.Current choice: Help me choose. This is your request for the supplier to confirm.Flow application concept of a modest fixed flat rooflight with a dark perimeter and solid ceiling around itAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: laminated and insulating glass constructions (opens in a new tab) ↗

An exact pane and cavity schedule will be agreed for the supplied rooflight.

Examples and guidanceSolar-control glass: light, heat and reflection

Solar control and privacy are different requirements. Ask for a sample and the light transmission and solar factor for the proposed glass.

Solar energy at glazingConcept rays show transmission, reflection and absorption without proportions or a performance claim.Glass appearanceIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

Solar-control products balance transmitted daylight, solar heat gain and reflected appearance. Orientation, shading, room use and the full glazing construction affect the choice.

Request visible light transmission, solar factor and reflectance for the named build-up. A tinted appearance alone does not specify solar performance; compare a sample and review thermal-stress requirements with the supplier.

Examples you may seeGive the elevation and room use alongside the target solar factor.Compare internal and external reflection under the expected lighting.Available choices: Help me choose; Clear; Clear solar-control; Grey solar-control; Satin privacy.Current choice: Help me choose. This is your request for the supplier to confirm.Flow application concept of a modest fixed flat rooflight with a dark perimeter and solid ceiling around itAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Pilkington: solar-control glass (opens in a new tab) ↗

Solar control and privacy are different requirements. Ask for a sample and the light transmission and solar factor for the proposed glass.

Examples and guidanceRoof glazing, kerb reference and weathering

The complete build and intended location determine the safety specification. Include any designer's requirements in the notes.

Rooflight section referencesConcept section distinguishes roof opening, supporting kerb and roof glazing. No waterproofing detail or build-up prescribed.Overhead glass specificationIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

Opening size, kerb size, frame size and glazing size are different dimensions. Use the supplied roof system’s stated measurement basis and section drawing before manufacture.

Confirm roof fall, upstand or kerb, drainage, edge cover, weathering and the specified overhead safety glazing. Opening systems also need operating clearances and controls; an ordinary rooflight is not automatically walk-on glazing.

Examples you may seeMark whether dimensions describe the opening or external kerb.Request the manufacturer’s installation drawing for the actual product.Available choices: Help me choose; Supplier to propose overhead safety glazing; Laminated inner pane requested; Designer’s glass specification available.Current choice: Help me choose. This is your request for the supplier to confirm.Flow application concept of a modest fixed flat rooflight with a dark perimeter and solid ceiling around itAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: GlassTime technical handbook (opens in a new tab) ↗

The complete build and intended location determine the safety specification. Include any designer's requirements in the notes.

Examples and guidanceLow-emissivity coating and glazing surface

Glass-only and whole-product U-values are different. Put target values and their assessment basis in the notes.

Example cavity-facing low-E coatingDouble-glazed example with thin coating on a cavity-facing surface of the inner pane. Confirm permitted surface with manufacturer.Thermal and solar performanceIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

A low-emissivity coating changes radiant heat transfer at a glass surface. It is a thin surface treatment, not another glass pane. Confirm the named coating and its permitted position in the proposed glazing.

The diagram is one double-glazed example with a cavity-facing coating, not a placement rule for every coated product. Number surfaces from outdoors to indoors and obtain the manufacturer’s approved construction. Centre-pane Ug differs from whole-window Uw.

Examples you may seeSpecify the named coating and intended build-up.Ask whether a quoted thermal value applies to the glass unit or the whole window.Available choices: Help me choose; Supplier to recommend for the room; Whole-product U-value target in notes; Glass-only U-value target in notes; Thermal and solar-control specification available.Current choice: Help me choose. This is your request for the supplier to confirm.Flow application concept of a modest fixed flat rooflight with a dark perimeter and solid ceiling around itAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Pilkington: Optitherm low-emissivity glass (opens in a new tab) ↗

Glass-only and whole-product U-values are different. Put target values and their assessment basis in the notes.

Examples and guidanceRoof glazing, kerb reference and weathering

Describe the roof fall, finished kerb width and height, membrane and supporting construction in the notes.

Rooflight section referencesConcept section distinguishes roof opening, supporting kerb and roof glazing. No waterproofing detail or build-up prescribed.Roof and supporting kerbIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

Opening size, kerb size, frame size and glazing size are different dimensions. Use the supplied roof system’s stated measurement basis and section drawing before manufacture.

Confirm roof fall, upstand or kerb, drainage, edge cover, weathering and the specified overhead safety glazing. Opening systems also need operating clearances and controls; an ordinary rooflight is not automatically walk-on glazing.

Examples you may seeMark whether dimensions describe the opening or external kerb.Request the manufacturer’s installation drawing for the actual product.Available choices: Help me choose; New kerb — drawing to follow; Existing kerb — survey details available; Need kerb and waterproofing advice.Current choice: Help me choose. This is your request for the supplier to confirm.Flow application concept of a modest fixed flat rooflight with a dark perimeter and solid ceiling around itAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: GlassTime technical handbook (opens in a new tab) ↗

Describe the roof fall, finished kerb width and height, membrane and supporting construction in the notes.

Examples and guidanceRoof glazing, kerb reference and weathering

This product is fixed. If it needs to open, request a separate opening-system proposal.

Rooflight section referencesConcept section distinguishes roof opening, supporting kerb and roof glazing. No waterproofing detail or build-up prescribed.Daylight or ventilation?Illustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

Opening size, kerb size, frame size and glazing size are different dimensions. Use the supplied roof system’s stated measurement basis and section drawing before manufacture.

Confirm roof fall, upstand or kerb, drainage, edge cover, weathering and the specified overhead safety glazing. Opening systems also need operating clearances and controls; an ordinary rooflight is not automatically walk-on glazing.

Examples you may seeMark whether dimensions describe the opening or external kerb.Request the manufacturer’s installation drawing for the actual product.Available choices: Help me choose; Fixed daylight glazing; Opening ventilation required — alternative system requested.Current choice: Help me choose. This is your request for the supplier to confirm.Flow application concept of a modest fixed flat rooflight with a dark perimeter and solid ceiling around itAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: GlassTime technical handbook (opens in a new tab) ↗

This product is fixed. If it needs to open, request a separate opening-system proposal.

Examples and guidanceItemised scope for this product

Tell us about roof height, site access, lifting and waterproofing in the project notes.

Numbered specification scheduleA numbered schedule separates panel specification, hardware, delivery, fitting and approvals.Supply and installationIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

Use an itemised quote to separate the product, fabrication, hardware, survey, delivery and installation. Identify work by others and drawing approvals before manufacture.

An optional accessory request does not establish its compatibility with the proposed product. Ask the supplier to confirm the named part, included quantities and any installation requirements.

Examples you may seeSupply only: identify delivery and hardware inclusions.Survey and fitting: identify who confirms final sizes and the supporting construction.Available choices: Help me choose; Supply only — installer appointed; Supply and installation requested; Site survey and installation proposal.Current choice: Help me choose. This is your request for the supplier to confirm.Flow application concept of a modest fixed flat rooflight with a dark perimeter and solid ceiling around itAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: glass types (opens in a new tab) ↗

Tell us about roof height, site access, lifting and waterproofing in the project notes.

Examples and guidanceRoof glazing, kerb reference and weathering

Frameless appearance still needs support, border coverage and protection for the insulating-glass edge seal.

Rooflight section referencesConcept section distinguishes roof opening, supporting kerb and roof glazing. No waterproofing detail or build-up prescribed.Perimeter and edge detailIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

Opening size, kerb size, frame size and glazing size are different dimensions. Use the supplied roof system’s stated measurement basis and section drawing before manufacture.

Confirm roof fall, upstand or kerb, drainage, edge cover, weathering and the specified overhead safety glazing. Opening systems also need operating clearances and controls; an ordinary rooflight is not automatically walk-on glazing.

Examples you may seeMark whether dimensions describe the opening or external kerb.Request the manufacturer’s installation drawing for the actual product.Available choices: Help me choose; Polished edge with decorative border; Match existing detail — drawing to follow; Supplier to design the perimeter detail.Current choice: Help me choose. This is your request for the supplier to confirm.Flow application concept of a modest fixed flat rooflight with a dark perimeter and solid ceiling around itAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: GlassTime technical handbook (opens in a new tab) ↗

Frameless appearance still needs support, border coverage and protection for the insulating-glass edge seal.

3. Sizes and fabrication notes

3Size and quantity

Enter the dimensions for your selected measurement reference. Rooflights commonly use internal opening sizes; lanterns use external finished kerb sizes. These are not glass cutting dimensions. If unsure, request a site measurement.

Examples and guidancePanel outline and drawing

Choose the finished outline. A rectangle needs width and height; a circle needs diameter. Bespoke shapes need enough dimensions, radii and datum references to define the outline.

Panel dimension referenceFinished rectangular panel width and height. Opening dimensions are a different reference.Opening shapeIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

A preview is an illustration; ask the supplier to confirm the manufacturing drawing or template.

Examples you may seeRectangle or square: finished width and height.Circle: diameter, with hole or cut-out positions separately documented.Available choices: Rectangle / square; Shaped / drawing to follow.Flow application concept of a modest fixed flat rooflight with a dark perimeter and solid ceiling around itAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: glass types (opens in a new tab) ↗
Examples and guidanceMeasurement units

1 cm equals 10 mm. Choose the units before entering sizes; keep drawing annotations in the same units.

Panel dimension referenceFinished rectangular panel width and height. Opening dimensions are a different reference.Measurement unitsIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

The form converts entered measurements to the existing millimetre specification fields.

Examples you may see120 cm = 1,200 mm.60 cm = 600 mm.Available choices: Millimetres (mm); Centimetres (cm).Flow application concept of a modest fixed flat rooflight with a dark perimeter and solid ceiling around itAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: glass types (opens in a new tab) ↗
Examples and guidanceFinished panel dimensions

Record the finished width and height of each distinct panel. For a circle use its diameter; shaped work needs a dimensioned drawing or agreed template.

Panel dimension referenceFinished rectangular panel width and height. Opening dimensions are a different reference.Width ( mm )Illustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

An opening, frame and finished glass are different references. Request a survey when the finished manufacturing dimensions remain unknown.

Examples you may seeOne size per basket line; quantity records identical pieces.Check units and the dimension reference before confirming manufacture.Flow application concept of a modest fixed flat rooflight with a dark perimeter and solid ceiling around itAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: glass types (opens in a new tab) ↗
Examples and guidanceFinished panel dimensions

Record the finished width and height of each distinct panel. For a circle use its diameter; shaped work needs a dimensioned drawing or agreed template.

Panel dimension referenceFinished rectangular panel width and height. Opening dimensions are a different reference.Length ( mm )Illustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

An opening, frame and finished glass are different references. Request a survey when the finished manufacturing dimensions remain unknown.

Examples you may seeOne size per basket line; quantity records identical pieces.Check units and the dimension reference before confirming manufacture.Flow application concept of a modest fixed flat rooflight with a dark perimeter and solid ceiling around itAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: glass types (opens in a new tab) ↗
Examples and guidanceQuantity of identical pieces

Quantity counts pieces with the same size and specification. Enter different sizes or constructions as separate basket lines so each requirement is retained.

Numbered specification scheduleA numbered schedule separates panel specification, hardware, delivery, fitting and approvals.QuantityIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

Examples you may seeThree identical panels: quantity 3.Two distinct sizes: separate lines.Flow application concept of a modest fixed flat rooflight with a dark perimeter and solid ceiling around itAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: glass types (opens in a new tab) ↗
Examples and guidanceSealed-unit panes, cavities and edge seal

An insulating glass unit has separate glass panes around one or more sealed cavities. At the perimeter, a spacer maintains separation, with the specified edge-seal system closing the unit. The cavity contains the specified dry air or gas.

Insulating glass unit sectionTwo separate panes around a sealed cavity; a perimeter spacer and edge seal sit between the panes at the bottom edge.Required glazing unit depth (mm)Illustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

A double-glazed unit has two panes and one cavity; a triple-glazed unit has three panes and two cavities. Specify pane types and treatments, cavity widths, spacer, gas and seal compatibility separately.

Examples you may seeA 4 / 16 / 4 example totals 24 mm: 4 mm pane, 16 mm cavity, 4 mm pane.A laminated pane within a sealed unit has its own bonded make-up in addition to the unit cavity.Flow application concept of a modest fixed flat rooflight with a dark perimeter and solid ceiling around itAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: laminated and insulating glass constructions (opens in a new tab) ↗
Optional glazing depth from your specification, not the overall rooflight or lantern height.
Examples and guidanceDrawing references and unresolved details

Record drawing references, site conditions and requirements not captured in the choices. Identify anything that needs a survey or supplier confirmation before manufacture.

Numbered specification scheduleA numbered schedule separates panel specification, hardware, delivery, fitting and approvals.Project and fabrication notesIllustrative schematic, not to scale or a fabrication / fixing specification.

What your choice means

Examples you may seeNumber drawings and panel positions consistently.State access constraints and the requested work scope.Flow application concept of a modest fixed flat rooflight with a dark perimeter and solid ceiling around itAI-generated product illustration from Google Flow; not an exact product sample, completed installation or proof of performance.Guardian: glass types (opens in a new tab) ↗

0/2000 characters. Share drawings and photos in the job conversation after submitting.

Before you choose

The decisions that matter

01

A simple glass perimeter

A polished edge and decorative border can give a less prominent perimeter. Agree the visible detail and sample before ordering.

02

Plan support and waterproofing

A frameless appearance still needs a designed support and protected edge seal. The finished kerb and roof membrane are part of that detail.

03

Choose your glazing

Request double or triple glazing and a clear, solar-control or satin appearance. The final glass build must suit the overhead location and supporting system.

Ready for a useful supplier quote

  • Confirm the dimension reference before manufacture. The researched size chart uses internal opening dimensions; do not use these as external frame or glass sizes.
  • Agree the supporting kerb, roof fall, border coverage, edge protection and waterproofing using the supplied system’s current drawing.
  • Confirm the exact overhead safety build, thermal performance and site wind and snow requirements. This fixed rooflight is not a walk-on product.
  • Use the frameless system’s own installation drawing; framed profile dimensions must not be transferred to it.

Research behind these choices

Reviewed 23 October 2026. Manufacturer guidance and supplier ordering pages inform these design questions. Agree the final construction and project requirements with your supplier.

Useful questions

Can I get a quote before I know every detail?

Yes. Choose Help me choose where you need advice, or request a site measurement. Suppliers can review the brief; a firm manufacturing price needs an agreed final specification.

Does adding a panel place an order?

No. It saves a specification in your quote basket. Review the basket and provide your delivery details to request supplier quotes. Your configuration does not approve the product for installation.

What should I confirm for frameless rooflight?

Confirm the dimension reference before manufacture. The researched size chart uses internal opening dimensions; do not use these as external frame or glass sizes. Agree the supporting kerb, roof fall, border coverage, edge protection and waterproofing using the supplied system’s current drawing. Confirm the exact overhead safety build, thermal performance and site wind and snow requirements. This fixed rooflight is not a walk-on product. Use the frameless system’s own installation drawing; framed profile dimensions must not be transferred to it.

Compare related glass

Low-E coated glass →Solar control glass →Self-cleaning glass →Laminated glass →Double & triple glazed units →