Walk-on rooflights in Brighton & Hove

Before anyone talks about glass, look at what holds it. A walk-on rooflight is only as good as the structure under it. If any link in the load path flexes, the glass is asked to do a job it was never designed for.

On a flat roof the opening is usually trimmed. That means the existing joists are cut back around the hole and the loads are picked up by new trimmers, doubled joists or a steel section, sized by a structural engineer where the span or the load calls for one. The upstand is then built up from that trimmed frame, insulated and weatherproofed, and the rooflight frame is bedded onto it. Where the new opening is the first hole ever cut in that roof, Building Control looks at the structure, the weathering, fire spread and energy performance together.

Aluminium, timber and upvc frames

For anything that people will genuinely walk on, we talk through the frame material at the survey, because it decides how the glass is edged, drained and sealed.

Frame materials for walk-on units

Frame	Where it suits	Why
Aluminium	Most walk-on units	Strong in slim sections, little movement
Timber	Traditional rooms	A warmer, traditional look below
Upvc	Smaller panels	Turns up on lower-load units

The upstand and the kerb

A kerb is the raised box the rooflight frame sits on. An upstand is the part of the roof covering that turns up its sides. Together they keep water from running over the edge of the frame and into the build-up.

Our flat roof rooflights page covers fixed units that are not meant to take weight. A walk-on unit uses the same family of ideas, but with a stiffer frame and heavier glazing.

Walk-on glass is not thick window glass. It is a laminated build-up of several toughened panes bonded together with interlayers. Toughened glass is heat-treated so that it is stronger than ordinary annealed glass and breaks into small blunt pieces. Laminating it means that if one layer cracks, the others stay bonded and the floor stays in place. That is the safety idea behind every walk-on unit: you do not rely on one sheet.

What each layer of the stack does

Layer	Its job	Detail
Top surface	The surface you stand on, often treated for grip	Sometimes sacrificial, so it can be replaced without disturbing the layers below
Underside layers	Carry the load	Bonded laminated panes
Sealed unit	Thermal performance	Double or triple glazed, beneath or inside the stack, depending on the make

How thick, how strong

The thickness depends on the span, the supports and the load the floor must carry. We do not guess or quote a standard figure from memory. The manufacturer calculates the build-up for your exact size and loading, and the quote states what you are getting. Our spoke on walk-on rooflight loads and glass specifications goes into the detail.

Anti-slip and self-cleaning glass

A smooth glass floor can be slippery in the wet. Anti-slip treatment is usually a fine fritted pattern or an etched finish on the walking face, and it is chosen for where the glass sits. Inside a hallway it can be gentle. On an open terrace it needs to be firmer. We cover this in anti-slip glass for walk-on rooflights and answer the common worry in are walk-on rooflights slippery when wet.

Self-cleaning glass has a coating that breaks down organic dirt in daylight and lets rain sheet the dust away. It helps on a roof you cannot easily reach. It is not a reason to skip cleaning, and on a walk-on surface the coating has to sit alongside the grip treatment, so it is a decision we make with you at the survey rather than an automatic extra.

The room under a walk-on rooflight lives with it every day, so it deserves as much thought as the roof. Start with what the room is. A hallway, a basement kitchen, a utility room and a home office each want a different amount of daylight, and each reacts differently to heat gain from a south-facing pane in July.

Glass lets in heat as well as light, and a large south-facing walk-on unit over a small room can warm it more than you would like. Glazing choices help.

Condensation, ventilation and light

A fixed walk-on rooflight does not open. If the room has no other ventilation, a damp basement can feel stuffy even with plenty of daylight. We look at air movement at the survey and, where the room needs it, suggest a separate extract or an opening rooflight nearby. Our page on electric and opening rooflights covers those units. On the daylight side, England sets no minimum daylight rule for houses, so how much light you want is your call and not a code figure.

Walk-on glass is not a single product. It comes as a fixed flat rooflight, as a square or rectangular panel, as a round unit, and as a bespoke shape cut to suit a particular plan. The common locations are a flat roof, a roof terrace, a balcony, a courtyard paving, a garden path over a cellar and an internal floor between storeys.

Flat roof and terrace

A flat roof with a terrace on it is the classic walk-on rooflight job. The glass runs in line with the decking or paving, and the room beneath receives daylight through the terrace floor. For that kind of project see our spoke on walk-on rooflights for roof terraces and balconies, and if you already have a finished terrace, can a walk-on rooflight go into an existing terrace explains what changes.

Pavement lights, lightwells and basements

Many Brighton and Hove terraces have a front lightwell or a coal-hole vault under the pavement or the front garden. A walk-on unit can bring daylight into the vault without leaving a hole. The access and the drainage are the hard parts, and they are covered in walk-on rooflights over basements and lightwells.

Pitched roofs, lanterns and pyramids

Most pitched roofs are not walked on, so a normal roof window or a roof lantern is the right choice there. A pyramid or lantern sits above the roof on a kerb. We have a separate page on can you stand on a normal rooflight. If your plan is a lantern, see roof lanterns. For pitched glazing look at roof windows and VELUX windows.

Glass loses heat more quickly than an insulated roof, so the glazing specification does a lot of the work. A walk-on unit is a rooflight in the flat-roof sense, so the 2.2 figure is the usual benchmark. A sealed double glazed unit with a low emissivity coating and a warm edge spacer can reach it. Triple glazing improves it further, and it is worth discussing for a large pane over a living space.

Our energy efficient rooflights page goes through the same measures for other products. The point to carry over is that the U-value you read on a brochure is for the whole unit, frame included, so a slimline aluminium frame with a thermal break matters as much as the glass itself.

Aluminium, timber and upvc finishes

Frame finishes should match the building. Powder-coated aluminium comes in a wide colour range. Timber can be painted or stained for an internal feel. Upvc is less usual in walk-on work and mostly appears on smaller, lightly loaded panels. If you are in a conservation area, see conservation rooflights for what suits a heritage street.

Fire and sound

Part B deals with fire spread, and a rooflight near a boundary may be limited in how much unprotected area it can have. A walk-on panel sitting in a floor between two storeys also has to consider fire resistance between the levels. We raise this at survey when the location suggests it.

Planning first. Class C permitted development lets a house have rooflights in its roof slope, with the unit projecting 150 mm or less from the roof plane and staying below the roof's highest point. Which rights you have depends on the building.

A terrace adds its own planning questions: a new terrace, a balustrade or a change to the roof edge may need permission, even when the rooflight alone would not. The process is walked through in our planning guide for local rooflights.

Building Control

Cutting a new opening in a roof is building work, and so is replacing a whole rooflight unit like for like. That makes it notifiable, and Part L governs the new unit. Building Control looks at structure, weathering, fire and energy. For a notifiable walk-on installation, we submit the Building Control notification, to a registered building control approver or the local authority. Our Building Regulations guide sets out the whole picture.

Guarding and Part K

If the rooflight sits in a terrace, the edge of the terrace may need a guard, and the rules for guarding fall under Part K. That belongs to the terrace design more than the glass, but we look at it together, because the position of the glass relative to the edge affects the guard.

Party walls and leasehold

The Party Wall etc. Act 1996 applies only where work touches a shared party wall. A terrace rooflight in the middle of your own roof usually does not. If you live in a flat or a converted house, the roof is usually the freeholder's and a leaseholder normally needs written consent under the lease, often called a licence for alterations. Check your lease and read rooflights in flats and leasehold buildings.

Walk-on glass is heavy. Laminated panels weigh far more than a window of the same size, and a large one is a job for a team, lifting gear and a clear route. That makes access the first problem, long before the glass arrives.

Brighton and Hove has a handful of roof types that each raise a different question for walk-on glass.

Scaffold, parking and deliveries

A scaffold standing on the pavement or the road needs a licence from the highway authority; depending on the address that is Brighton & Hove City Council, West Sussex County Council or East Sussex County Council. A glass delivery or a crane may also need a parking bay suspension. We apply for both, and we say so in the quote. Read more in scaffold licences and parking suspensions for roof work, and remember that these permissions can affect the date.

The access plan

Every quote includes the access plan, a written page that sets out the route to the roof, who applies for the licences, whether freeholder consent is needed and the notice given to neighbours, the Building Control route and the price. For a walk-on rooflight that page is more than paperwork, because a pane that cannot be lifted in on the day is a pane that stays on the pavement.

Salt air and wind

Near the seafront, salt air attacks metal finishes and fixings, and wind loading is more severe. We choose coatings suited to coastal exposure and stainless fixings where the site calls for them.

There is no single standard walk-on size the way there is for a roof window. Makers offer a range of square and rectangular modules, and beyond that almost every project is bespoke. The reason is simple: the opening is set by your joists, your wall positions and the room below, not by a catalogue.

One pane or several

Wide panes need more glass thickness or more supports. We talk through both options at the survey, with the measurements in front of us, and the written quote names the size and the make-up of every panel.

A walk-on installation follows a set order, and skipping a step costs more later. Here is how the work runs once the quote is accepted.

The work carries a 10-year workmanship guarantee. You can read the detail on our guarantee page.

We do not put a price on the page, because the figure depends on things we can only see on site. The factors that move it are consistent.

A first-time opening in a flat roof involves more than swapping a failed unit for a new one. The survey gives a fixed written figure, and the quote states what it includes. For the wider picture, see our costs page, and the spoke on how much a walk-on rooflight costs.

Replacing a failed unit

If the old walk-on rooflight has a cracked layer, a clouded interlayer or a failed seal, the survey assesses whether the frame and the upstand can take the new glass, and the quote covers the replacement. Our page on misted and failed rooflights goes through the signs.

Safety on a glass floor is mostly design. The laminated build-up, the grip treatment and the correct support spacing do most of the work. Our spoke on are walk-on rooflights safe goes through the logic. A walk-on unit should not be treated as a roof that anyone can cross carrying heavy objects, and it should not be used beyond its specified load.

Cleaning

Most dirt comes off with very little, and the wrong cleaner can do harm.

Lifespan

A well-built unit can last for many years, as long as the seal and the waterproofing at the upstand stay sound. That is why we treat the detailing as seriously as the pane.

Opening and ventilation

If the room needs fresh air, a walk-on unit alone will not provide it, because it is fixed. We can pair it with an opening rooflight nearby, or look at a sun tunnel for a small dark space, covered on our sun tunnels page. Where an opening unit is part of the same roof, an electric motor and a rain sensor are possible, so the room ventilates without anyone reaching up to a handle.

We cover Brighton and Hove and the towns up to 30 miles away by road. Walk-on jobs reward a local team for practical reasons. A survey visit is booked, since we have no public premises, and we come to you with a tape, a moisture meter and a camera.

Whether the job is a Hove basement, a Brighton terrace or a house further along the coast, the same questions apply: how does the glass get in, where does the water go, and who holds the permissions. The survey answers each one in writing before any money is committed, and the quote is fixed once you have read it.

Lifting heavy glass over a parapet on a street with one parking lane is a skill that comes from doing it on these roads, with the neighbours told in advance and the bay already suspended.

The workmanship guarantee runs for 10 years. To talk it through, ring 01273 282313, message us on WhatsApp on 07880 284133 or use the contact page.