Walk-on glass panel in a timber floor, looking down to the room below

Walk-On Rooflights in Derby

Daylight for the room below, glass you can stand on.

A walk-on rooflight turns a floor, terrace or patio into a window for the room beneath. We plan it from the spot you want lit.

Book a free survey

Free survey
Fixed written quote
10-year workmanship guarantee

Where walk-on glass lights a home

Walk-on rooflight set into paving, with a staircase visible beneath — Set into paving, with a staircase visible beneath the glass.

Square walk-on rooflight in a stone terrace beside a brick wall — Set into a rear terrace, lighting the kitchen extension beneath.

Walk-on glass set flush into sandstone paving with a room visible below — Flush in a garden path, brightening a lower-ground room.

Ten years on our workmanship. In writing.

Surveyed before we price
A fixed written quote that does not change on the day
Building Control notification handled

How the guarantee works

Walk-on rooflight flush with a decked roof terrace

The full guide

Walk-on rooflights, from the floor up

A walk-on rooflight lets you keep the floor and still light the room below. This guide goes through the glass, the frame, the roof or floor around it and the way we survey, quote and fit, starting from the spot you want to see daylight land on.

It is written for homeowners and small commercial occupiers across Derby and the towns around it.

Under your feet
Daylight below
Laminated layers
Frame and kerb
Flat roof build-up
Getting it in

Callout 1

Standing on the daylight

Walk-on glass beside a standard flat rooflight

Walk-on rooflight

Carries foot traffic
Laminated, multi-layer glass
Sits flush with the surface
Needs designed support
Anti-slip finish on top

Standard flat rooflight

Not for standing on
Single or double pane
Raised on a kerb
Light frame is enough
Smooth, easy to clean

A walk-on rooflight is a sheet of structural glass set into a floor, a flat roof or a paved area, strong enough to be stepped on. Daylight drops through it into the room below, and you can cross it in socks or boots without a second thought. People call it a walk-on skylight when they describe it to us, and rooflight when they have read a specification. Both names point at the same thing, and this page uses them interchangeably.

If you have been scanning lists of walk on rooflights Derby suppliers, you will have noticed that nearly all of them sell a glass panel and stop there. A panel is only half the job. The glass has to sit on a frame that carries its load, the frame has to sit on a structure that can take it, and the joint with the roof or floor has to stay dry for decades. We survey the place, design the support, fit the unit and deal with the paperwork, so one firm answers for the whole assembly.

Start with the spot below

Before we talk about glass, we ask what is underneath. A dark hallway under a first-floor landing is one answer. A utility room that sits beneath a rear terrace is another. A cellar den, a gym in a converted garage or a stairwell that never sees the sun are all places where a conventional rooflight cannot reach, because there is no roof above them, only another room, a floor or a patio. The walk-on unit exists to solve exactly that problem. It lets the room above keep its floor while the room below borrows its sky.

That is why the spot goes on the floor plan first. If the aim is to light a worktop, the unit goes where the daylight will fall across the worktop, not where the joists happen to be easiest. If the aim is to brighten the foot of a staircase, we look at where people pause. Joists, ducts and pipework come second, and we design around them.

Where walk-on glass is fitted

The usual homes for a walk-on rooflight are a ground-floor extension with a flat roof that doubles as a terrace, a first-floor landing floor above a dark hall, a garden path or patio above a basement or lower-ground room, and the floor of a mezzanine or loft platform. In each case the glass is one surface doing two jobs. We have written a separate page on walk-on rooflights for roof terraces and balconies, because terrace fitting brings extra questions about falls, guarding and drainage.

What walk-on does not mean

Walk-on does not mean drive-on, and it does not mean any load at all. Every unit is rated for a stated loading, and that rating is matched to how the surface will be used. A hallway floor, a terrace with a table and chairs and a ground-level patio with a barbecue are three different loads. We read the manufacturer's rating against your use before we order anything.

For a closer look at ratings, the guide to walk-on rooflight glass and load ratings goes through the build of the glass and what the numbers on a data sheet are telling you. Whatever you read online, treat a walk-on rooflight as a small piece of structure that happens to be transparent.

A final point on terms. Roof windows open and sit in a pitched slope. Rooflights, including lanterns, sit on a kerb on a flat roof or are glazed into a floor. A walk-on unit is the one rooflight that you are meant to put your weight on. If your roof is flat and you want a lit room underneath without giving up the terrace above, you are in the right place, and our flat roof rooflights page covers the neighbouring options where nobody needs to walk.

Every walk-on unit starts as a spot on a floor plan, then becomes a structure, then becomes glass.

Callout 2

How much light reaches the room

Glass in a floor sounds like a magic window, and it does a real job, but it is worth being honest about what it can and cannot do. A walk-on rooflight admits daylight from above, so the amount that reaches the room below depends on the size of the glass, what sits above it and how far down the light has to travel.

Size, shade and depth

A larger pane lets in more light, but the light well matters as much as the glass. If the unit sits above a shallow ceiling void, the light arrives broad and soft. If it has to drop through a deeper shaft, the walls of the shaft catch some of it, so we finish them pale and smooth and often splay them slightly. A tree, a wall or a taller building next door will shade the glass for part of the day, and we note this at the survey, not after fitting.

Direction of the glass changes the character of the light too. A unit on a south-facing terrace admits strong light for much of the day, and the room under it can warm up in summer. One facing north is calm and even. We talk through glass choices with you, and the page on energy efficient rooflights explains how coatings and glazing layers manage the heat.

The question of basements

Lower-ground rooms are where walk-on glass really earns its keep. A basement is dark by nature, and a unit set into the garden above it, or into a pavement area at the side of a house, gives a room that was only ever a store a daylit life. We have a dedicated page that asks whether a walk-on rooflight can light a basement, because the answer depends on how deep the room is, what sits on top and how water is dealt with at the edges.

A basement unit has to be watertight from above and below. Condensation can form on the underside of cold glass in a damp room, so ventilation and the quality of the glazed unit both matter. Misted units, where the seal has failed and moisture sits between the panes, are a separate problem, and our page on misted rooflight replacement covers that case.

Privacy from below and above

A clear pane in a floor invites an obvious question. Can someone look down into the room, and can people in the room look up at whoever is on the surface? By day, a person standing over a lit pane generally sees reflections and little else. After dark, with the room lit, the view reverses. We offer glass finishes that scatter the view while still passing daylight, and we have covered the choices on a separate page about privacy with a walk-on rooflight.

If privacy matters to you, say so at the survey. We can often tell you straight away which of the finishes will suit your spot and which are better left alone.

Daylight is not a regulation

The Building Regulations set no daylight requirement for English houses, so nobody will force you to put a walk-on rooflight in a dark room. It is a decision about how you want the place to feel. That freedom is useful. It means we can size the unit to the spot you care about, a reading chair or a basin or the foot of a stair, rather than to a formula.

One practical word on cleaning. A walk-on pane gets leaves, grit and footprints. We leave you with simple advice on how to look after the glass, and the finish we recommend makes a difference to how often it needs attention.

Callout 3

What the glass is made of

The glass is the part everyone asks about, and rightly. A walk-on rooflight does not use ordinary window glass. It is built as a stack of toughened panes bonded together with interlayers, so that if the top surface is damaged the layers beneath hold. The number and thickness of those layers is chosen for the load the unit must carry.

Layers, interlayers and load

The top pane takes the foot traffic. Below it, the other panes share the load and keep the unit intact if one is chipped. The interlayer, a clear film bonded between panes, holds fragments in place if a pane does crack. That is why we say laminated, and why you should be wary of anyone who offers a single sheet for a floor.

The manufacturer states a load rating for each build, usually as a loading spread over the area and a separate point load for a heavy heel or leg. We compare those ratings with how the surface will be used, and we explain the reasoning in plain language at the survey. Our page on glass and load ratings goes further for anyone who wants to read a data sheet with confidence.

Slip resistance

Wet glass is slippery, and anyone who has stepped on a glossy pane after rain knows it. Walk-on units can be made with a textured or fritted top surface, where a pattern of fine ceramic dots or an etched finish gives the sole something to grip. Different patterns give different grip and different views through the glass. We have laid out the details on the page asking are walk-on rooflights slippery, which is worth reading before you choose a finish for an outdoor surface.

Heat, condensation and insulation

A sealed double or triple glazed unit with a low-emissivity coating reduces heat loss, and the right gas fill and edge spacer cut down cold edges where condensation forms. For an existing home, Approved Document L (Part L 2021) caps the heat loss of a rooflight, lanterns included, at 2.2 W/m²K. A roof window is held to the stricter window limit of 1.4 W/m²K, or Window Energy Rating band B. A walk-on unit is treated as a rooflight, and we choose a build that complies.

The thicker the glass stack, the heavier the unit, and that has knock-on effects for the frame. A weighty pane needs a stiff, well-supported kerb or frame. We specify the frame and the supports together with the glass, so the numbers add up.

Other materials you may be offered

You may see walk-on products described with polycarbonate or GRP elements, or with a plastic frame such as uPVC. Plastic and GRP kerbs are common on flat roofs for ordinary rooflights, and a few walk-on products use them as part of the surround. For a unit that people stand on, we look at the whole assembly, and the load path, the frame and the glass all have to be rated for foot traffic. Anything thin or hard to rate for loading is not a sound base for a floor.

Colour, tint and finish

Clear glass gives the most light. A slight tint or a solar control coating reduces glare and heat. A frosted or obscured interlayer gives privacy. A thin dot pattern gives grip. You can combine them, and each choice changes the light a little. We show samples at the survey so you can hold them up to your own room and see how they behave.

Laminated layers carry the load, the interlayer holds the pieces together, and the top surface decides how it feels underfoot.

Four finishes for the top surface

How each top finish behaves when you step on it.
Finish	Grip	View	Best for
Smooth clear	Low	Clear	Dry indoor floors
Etched	Good	Soft	Landings, hallways
Fritted dots	Good	Dotted	Terraces, paths
Obscured layer	Varies	Hidden	Privacy-led spots

Callout 4

The frame that carries the glass

If the glass is the part you see, the frame is the part that matters most. A walk-on unit has to transfer weight into the structure around it, and the ring of material that does this, whether a metal frame, a fixed upstand or a bedded kerb, is where many poor installs fail.

Where the load goes

Imagine a person standing at the centre of a pane. Their weight spreads through the glass to the edges, down through the frame or kerb and into the roof or floor structure. That structure needs to carry the extra weight and tolerate small movements without cracking the seal. Timber joists need trimming around the opening, steel or additional timber trimmers pick up the loads from cut joists, and the whole arrangement is checked before the glass arrives. Where the structure is in doubt, a structural engineer's calculation is the sensible route, and we say so at the survey.

Upstand, flush and ground-set

There are broadly three ways the glass can sit. A raised upstand lifts the unit above the surrounding finish, which helps keep water out but leaves an edge you can trip on. A flush frame sits level with the floor or paving, which is neater but demands careful drainage at the edge. A ground-set unit sits into paving or decking, bedded onto a prepared base with the finish laid up to it.

What shapes the quote for a walk-on unit

Size of the glassA larger pane needs more layers, a stiffer frame and heavier handling.
Load rating neededA terrace or path takes a build that a hallway does not.
Structural workTrimming joists or adding steel changes the labour and materials.
Access to the spotLifting heavy glass into a tight space takes more people and time.
Finish and privacy choiceEtched, fritted or obscured layers change the build of the pane.

Each approach has a place. Raised upstands suit a flat roof where the glass is mainly for light and occasional stepping. Flush frames suit an interior floor. Ground-set units suit a patio or path. The one you choose also decides how the glass is sealed and how it is cleaned.

Keeping water out

Flashing, upstands and seals do the sealing, and flat-roof junctions are the first place a leak will show. On a flat roof we dress the membrane up the side of the kerb and under the frame, using flashings suited to the roof covering. Our page on flat roof rooflights talks about this junction in more depth. On a terrace, the finish around the glass needs a fall that carries water away from the frame, not toward it.

A weatherproof frame also needs a thermal break. Without one, cold travels through the metal and condensation forms on the inside. We choose frames that stop this, and we pair them with insulation round the kerb so the junction does not become a cold bridge.

Safety around the opening

Walk-on glass is built to carry people, but it is no substitute for a guard where there is a drop. If the surface above is a roof terrace or balcony, the edges need proper guarding, and the glass itself is only one part of the safety picture. Because that is a distinct subject, it lives on its page for roof terraces and balconies.

Flats, listed buildings and planning

If you are in a flat or maisonette, check your lease before anything else, since changes to a roof or a floor above or below another home may need permission from whoever owns the structure, depending on the lease and title. Householder permitted development does not extend to flats and maisonettes. On a house the rooflight is normally covered by permitted development, subject to conditions. We link them rather than repeat them, so please read our planning guide before you decide.

Conservation areas and listed buildings need their own care. A listed home needs consent for most changes. A conservation area can carry an Article 4 direction that removes permitted development, so Derby City Council is the one to ask. Our page on conservation rooflights explains slimmer, more traditional units, though a walk-on is a different product and the same care applies.

Callout 5

Roofs, floors and what sits around the glass

A walk-on rooflight rarely sits alone. It sits in a roof build-up or a floor build-up, and what surrounds it decides whether the job lasts. We look at the covering, the insulation and the deck around the opening before we settle the position of the unit.

Flat roofs and terraces

The most common home for a walk-on rooflight is a flat roof. That could be a rear extension, a porch or a garage, and the roof may be a single-ply membrane, a built-up felt system, a liquid-applied coating or a green roof. Each has its own way of joining to an upstand, so we plan the junction with the covering you have. If the covering is old and close to the end of its life, it often makes sense to renew it around the new unit at the same time, which avoids opening the same area twice.

Insulation is the next layer. A warm flat roof puts the insulation above the deck, and the rooflight kerb has to pass through it without leaving a gap. A cold roof leaves ventilation space below the deck, which means the opening must be detailed to avoid trapping moisture. We choose the approach to suit what is already there.

What we check at the survey

The spot below: marked on the floor plan, then chalked on the surface above
Surface above: roof covering, paving, decking or floor finish
Structure: joist size, span and what must be trimmed
Services: pipes, cables and ducts beneath the opening
Falls and drainage: where the water goes once the glass is in
Access: how the glass reaches the spot on the day

Floors and landings

Inside, a walk-on unit may replace a section of floor. That means cutting through floorboards and joists, so we check what pipes, cables and ducts run beneath, and plan around them. The floor finish around the glass, whether carpet, timber or tile, needs a neat edge, and an unglazed gap must never be left open for dust and draughts. For a first-floor landing, we match the floor finish to the room so the glass looks planned, not added.

Gardens, paths and patios

At ground level, the glass sits in a surface of paving, decking or gravel. A concrete or masonry base takes the weight, and the glass sits on a frame that ties into it. The vital detail is drainage. Water that sits on the pane or pools at its edge will stain the glass and, over time, test the seal. We lay the paving to fall away from the unit, and fit a drain channel where space allows.

The paperwork

Cutting a new opening in a roof is building work, so Building Regulations approval is required, obtained through the local authority or a registered building control approver. The firm sends that notification for you. Swapping one rooflight for another is controlled work under Part L, so the replacement has to reach that same 2.2 W/m²K figure. A competent person scheme can self-certify this kind of swap.

Matching it to the rest of the house

Older streets close to the city centre tend to be Victorian and Edwardian terraces, the suburbs are interwar and post-war semis, and newer estates sit out at the edge. Each brings its own version of the same problem, a dark middle of the house or a dark lower room, and each has different roof forms and floor structures. A flat extension on the back of a terrace, a landing in a semi and a patio above a lower room on a new estate are three different jobs. We look at yours rather than assume.

If you are weighing a walk-on unit against a lantern over the same extension, our page on roof lanterns covers daylight from above where nobody needs to stand on the glass.

The glass is only as good as the roof or floor it sits in, so we survey the build-up first.

Callout 6

Survey, quote and fitting day

The way we work is simple. We come and look first, we put a fixed written quote in your hands, and then we fit the unit. Nothing about the quote should change on the day, because the survey is where the problems get found.

The free survey

A free survey is how every job begins. Room, spot and roof are all seen before a price is mentioned. We measure the opening, check the structure, look for services, think about how the glass will arrive and talk through finishes and privacy. You can send a request through the survey form in the quote section, use WhatsApp on 07880 284133 instead, or write to info@skylarkskylightsderby.co.uk.

A fixed written quote

After the survey you receive a written quote, fixed. It lists the unit, the structural work, the roof or floor finishing and the clear-up. If the survey shows that something needs extra attention, we say so there, not on the day.

Fitting day

For a straightforward single rooflight we are usually one or two days on the roof. Walk-on glass is heavy, so the unit is lifted in carefully, and the opening is prepared and checked before it comes near. If the job includes structural work or a floor build-up, we will tell you at the survey what the sequence looks like and how long each part takes.

From first look to finished floor

Survey
We look at the space below, the place the light should reach and the roof or terrace above, and measure the opening.
Written quote
A fixed quote follows, listing the unit, structure and finishing.
Order and prepare
The glass is made to size while the opening is planned.
Fit
Frame, glass, seals and surrounding finish go in, usually one or two days.
Hand over
You get care advice, the notification and the written guarantee.

The floor or roof finish is restored around the glass, the seals are checked, and the unit is cleaned and protected. We show you how to look after it, and what to avoid placing on it.

Building Control and the guarantee

In the cases that need it, we take care of the Building Control notification and install to current Building Regulations. You then have a 10-year workmanship guarantee, in writing. Our page on the guarantee sets out what it covers.

Care after fitting

Keep the glass clean and the drainage clear. Do not drag heavy furniture across the pane, and use felt pads under chair legs. If a crack or chip appears, tell us at once, because the laminated build gives you time to deal with it properly. A clear pane that is looked after will keep its light for a long time.

Where we work

Our patch is Derby plus roughly 30 miles by road. Our areas page lists the towns. Homes are the main work, and small commercial jobs are welcome too. For the wider choice of products see all our services, or ask for the survey and we will start from the spot you want lit.

Before you step onto the glass

Can you walk on any glass rooflight in Derby?

No. Only a unit built and rated for foot traffic should be stood on. A normal flat rooflight is not made for weight, and stepping on one is dangerous. If you are unsure what you have, ask for a survey and we will tell you what it is and whether it can be used safely.

Will a walk-on rooflight leak?

A properly flashed and sealed unit should stay dry. Leaks come from the junction with the roof or floor far more often than from the glass. We detail that junction for your covering, check the falls and seal the edges. The 10-year workmanship guarantee is in writing.

Will a walk-on rooflight need planning permission?

A rooflight on a house is usually permitted development, with conditions, and flats and maisonettes are outside householder rights. Listed buildings need consent, and conservation areas may be affected. Read our planning guide and check with Derby City Council if unsure.

Do you handle Building Control for a walk-on unit?

Yes, when the job is notifiable. Cutting a new opening in the roof needs approval through the local authority or a registered building control approver. The notification is ours to send, and the install follows current Building Regulations.

How long does fitting take?

For a straightforward single rooflight we are usually one or two days on the roof. Extra structural work, a floor build-up or awkward access can add to this, and we explain the sequence at the survey before you commit.

Can a walk-on rooflight make a room warmer or colder?

It can do either if chosen badly. A well-built sealed unit with a low-emissivity coating limits heat loss, and the limit for a rooflight in an existing dwelling is 2.2 W/m²K. Solar control glass can reduce summer warmth where the unit faces south.

Book your free survey

Where do you want the light? Tell us in the form: the worktop, the stair, the desk.

No obligation. We survey before we price.
We cover Derby and 30 miles around.