Flat roof rooflight fitting in Stockport

Flat roof rooflights in Stockport

Flat roofs over dark kitchens, back additions and utility rooms can take a rooflight on a raised upstand.

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  • Fixed written quote
  • We handle the Building Regulations notification where the work is notifiable
  • 10-year workmanship guarantee
A narrow galley kitchen with an exposed brick wall, lit by a run of flat rooflights

A flat roof rooflight is a glazed unit set into a flat or low-pitched roof on a raised upstand. It gives daylight to a room that has a roof overhead where a pitched house would have a loft. We fit new ones into extensions, back additions, porches and utility rooms, and swap worn ones for new, in Stockport itself and the ground within about 30 road miles of it.

Every job begins with a free survey, and a first photo of the roof can go to us on WhatsApp, 07880 284133, though a figure only follows the visit. Pitched roofs, sun tunnels and our other products have pages of their own, reached from skylight and rooflight installation in Stockport.

A dining room with a long oak table under a flat rooflight, French doors open to the garden

Washing, shading and venting

  • Outside, the glass is washed with a water-fed pole and brush, or by hand from a ladder set against the wall. Walk-on rooflights are the single kind built to take a person's weight.
  • A fixed unit never needs opening. For a room that wants a vent, opening versions exist from some makers: a hand pole lifts them, or a motor does it from a wall switch or a hand-held control.
  • Blinds come in pleated, softer styles for kitchens and offices and blackout styles for bedrooms, each cut to the unit's dimensions.
  • On certain electric models a rain sensor is part of the maker's design, and the maker describes it shutting the vent once rain is detected. Which models carry one is something we tell you at survey.

Choosing a flat rooflight

Flat roof rooflight installation in Stockport: choosing, fitting and living under one

From how much light to expect to the survey, the consents and the paperwork at the end.

A flat rooflight is a small piece of glass with a lot riding on its upstand: the raised box it sits on, the roof covering that meets it and the way the roof drains all shape the job. The glass, the opening type and the blind are the choices you see from the room, and the upstand is the one that keeps the weather out.

How much brighter will a kitchen or extension feel under a flat rooflight?

Benefits of natural light from overhead

A window lights a room from one side. A rooflight lights it from above, so the brightness falls on the worktop, the dining table or the sofa rather than on the wall beside the glass. That matters most in rooms with a flat roof over them: a kitchen extension running back from a terrace, a utility room, a porch, the link between an old house and a new addition. In such rooms the side windows, if there are any, can face a fence or a neighbour's brickwork, and the lights are on at midday.

Brightness is the plain benefit. The softer one is how the room feels to be in. Overhead glass shows the sky, the weather and the time of day, which a window on a gloomy elevation cannot do, and that is a good part of what wellbeing in a house comes down to. The amount of light depends on the size of the unit, the height of the walls around it and the glass chosen.

A man making tea at a kitchen island under a glazed roof, a sofa in the foreground

Which Stockport rooms suit one

  • Red-brick terraces of Edgeley, Heaton Norris and Reddish. A back addition can be the darkest room in the house, and where it has a flat roof, a rooflight over the kitchen end changes how the whole ground floor reads.
  • Semis and bungalows from between the wars and after, across Heald Green, Hazel Grove, Cheadle Hulme and Bramhall. Many have a rear extension or a dark landing, and the extension roof is the natural place for one.
  • Large villas in the Heatons and Davenport. Their tall ceilings can take one wherever a later flat roof sits at the rear.
  • Houses along the hill edge at High Lane, Romiley and Marple, in stone or brick. A modern extension can take one without changing the look of the front.

Where it goes in the room

Over an island or a dining table, a rooflight puts the light where people sit. Over a desk or a reading chair, the sun's path across the day matters more than the size of the unit, because glare on a screen or a page is a daily irritation. We ask what each part of the room is used for before we suggest where the opening sits.

Rooms and what suits them

Kitchen extension
Over the worktop or island, with a softer blind for strong sun
Dining area
Centred on the table, or on the end the family sits at
Utility room or porch
A small fixed unit does the job; a vent is optional
Link corridor
A long, narrow unit follows the route through the house
Home office
Placed with the sun's path and the screen in mind

Placement is worked out at the survey, from how the room is used.

Fixed, opening, dome or lantern: which flat rooflight suits my room?

Flat rooflight types compared
TypeOpens?SuitsDay to day
Fixed glass unitNoKitchens, dining areas, corridorsNothing to operate; shade with a blind
Opening unitHand pole or motorRooms that want a ventOpened and shut by the household
Polycarbonate domeFixed, or with a vent on someUtility rooms, garages, outbuildingsLighter, plainer look from inside
Walk-on unitFixedWhere a person will stand on itThe only kind designed for that

The main types

A fixed unit is a sealed pane of glass in a frame, with no vent, and it asks nothing of anyone. An opening flat rooflight has a hinged vent that some makers offer with a hand pole and others with an electric motor and a switch. A dome is a polycarbonate bubble on a kerb, lighter in construction and different to look at from inside, and it turns up on garages, outbuildings and utility spaces. The raised, multi-sided lantern is covered on our roof lanterns page, and a walk-on rooflight, built to be stood on, has its own page at walk-on rooflights.

Matching the type to the household

In a single-storey extension a hand pole can reach the vent. In a taller room, or over a kitchen worktop where nobody wants to stretch past a hob, a switch or handset is easier. Where an older relative shares the house, or children are about, the question changes again, and the choice is made with them in mind. A fixed unit is the answer when nobody wants another thing to operate.

Flat roof or pitched roof

If the room has a pitched roof, the product is a roof window, and the pages on VELUX windows and roof windows cover those. Where a flat roof is too small or the space below too awkward for a flat rooflight, a sun tunnel (light tube) may fit, and that has a page of its own as well. A side-by-side comparison of flat rooflight types sits in our guides.

Made to measure

A flat rooflight is picked or made to fit the opening it will fill, not forced into one. Each manufacturer range includes stock sizes, and some makers will build bespoke, so a unit can follow the room rather than the room being cut to a stock size. Makers differ in what they quote: one gives the outside face of the upstand, another the clear glass. The two figures differ by the upstand and frame on each side, so we confirm which is meant before measuring.

What is an upstand, and how does a flat rooflight stay watertight?

The upstand

Water does not sit still on a flat roof. The roof is built with a slight fall so that rain runs to a gutter or an outlet, and a rooflight has to live with that. The upstand, also called a kerb, is the box that surrounds the opening and carries the glazed unit. It raises the frame above the water on the roof surface, so the joint between frame and upstand sits clear of standing water. An insulated upstand can arrive with the unit from its maker; the other route is timber, framed on the roof and lined with insulation there.

Falls and drainage

An upstand across the fall can hold water back behind it, so the position of the opening is checked against the way the roof drains. A unit set where water runs hard against its uphill edge needs more care than one set where the fall carries water round it. A survey picks these details up from the roof itself, which is why a photo alone never produces a price from us.

The tie-in to the roof covering

A flat rooflight is only as weatherproof as the joint between its upstand and the roof covering. The covering is carried up the faces of the upstand and finished beneath the frame's flashing or trim, and each material is joined in its own way:

  • EPDM rubber;
  • GRP;
  • bitumen felt;
  • another single-ply membrane.

The survey begins with finding out what covers your roof, and the guide on upstands and roof coverings takes the materials one by one.

Height, and the planning limit

Upstand and frame together set how far the rooflight stands above the roof surface, and the planning chapter below comes back to that projection.

How warm is a flat rooflight, and what do the regulations ask of it?

Glass and upstand terms

U-value
How fast heat passes through a surface. A lower number means less heat lost.
Low-E coating
A fine coating on the glass that keeps warmth indoors.
Solar control coating
A maker's glass finish that cuts the sun's heat reaching the room.
Upstand
The raised box round the opening that the frame sits on; also called a kerb.
Developed surface
Every outside face of the unit that heat can escape through; it can add up to more than the hole in the roof.

Energy efficiency in the glass

Glass loses heat faster than a solid roof, so a rooflight is judged on its U-value, the measure of how quickly heat passes through it: the lower the number, the better. Makers offer double glazing, and some offer triple glazing or a low-E coating, a thin layer on the glass that sends warmth back indoors. A rooflight also gets warm in sunshine, and some makers offer solar control coatings on the glass to cut the sun's heat. We say at survey which units in a maker's range carry which options.

The limits in England

In England, a new or replacement rooflight in an existing home should have a U-value no worse than 2.2 W/m²K. Roof windows have a separate limit of their own, and the figure above is the one for rooflights. A rooflight's U-value is based on its whole outer developed surface area, which is often larger than the hole in the roof. Where the kerb comes as one assembly from the same supplier, the 2.2 limit covers the kerb too; an upstand built on site should be no worse than 0.35 W/m²K.

Replacing one, and the area guide

  • Replacing only the glass, or a window in its existing frame, is not providing a controlled fitting, so the energy limits do not apply to that work.
  • Where a whole unit goes in, a replacement element should also be no worse than the one it replaces.
  • Approved Document L has an area guide too: where a window or roof window is enlarged or a new one created, the total area of windows, roof windows, rooflights and doors should not exceed 25% of the home's total floor area, unless compensating energy-efficiency measures are taken.
  • Approved Document L treats an extension differently, with its own glazing limit worked out from the extension's floor area plus the area of any windows and doors that no longer exist or are no longer exposed because of the extension.

Ventilation and the room

A room under a rooflight still needs ventilating, and a rooflight that opens can serve for both quick and background venting. That is a daily action for the household, and it is one reason the opening question comes up at survey. The Approved Document L pages are on the government's own site.

Is a flat rooflight right for a bathroom, a bedroom or a hallway as well as a kitchen?

Bathrooms and cloakrooms

A bathroom under a flat roof gets its light from the top, which leaves every wall free for tiles, mirrors and storage. Steam is the daily fact of the room. A fixed unit does nothing about it by itself, while a rooflight that opens can be used to let steam out by the person in the room. A blind for a damp room is made for that job, and it is picked alongside the unit so that it is the right size.

Bedrooms and playrooms

A bedroom with a flat roof over it, such as a first-floor room above a garage or a single-storey bedroom added to a bungalow, can take a rooflight. The point to raise early is the morning: sunshine arrives from overhead rather than from a curtained window, and a blackout blind suits a household that wants the room dark. Each blind is cut to the unit's dimensions and make, so it is ordered with the unit. A playroom gets even daylight for floor games, and a blind keeps the sun off a screen or a nap.

Where children use the room, an opening unit is a choice to make carefully. A vent in the ceiling is beyond a small child's grasp, but a pole or a handset left lying about is not, and some makers sell restrictors for the vent. Keep the control up high, or choose a fixed unit and ventilate the room another way; for more on restrictors and remotes, see child-safe opening rooflights.

Hallways, landings and link spaces

A hallway or a stair landing under a flat roof is a place where an extra window is hard to arrange, because there is no outside wall to take one. A rooflight lights the route without taking any floor space. On a stair, the height of the ceiling makes an opening unit awkward to reach, so a fixed unit, or an electric unit worked from a switch on the bottom stair, is the choice that gets used.

Garages, outbuildings and the home office

A garage turned into a playroom or a studio at the back of the garden is a flat-roofed room where a rooflight is one of the easiest ways to add daylight. A polycarbonate dome is one option for a utility space and a glass unit another for somewhere lived in. We recommend from what the room is for, so a home office gets a position that keeps the sun off the screen and a workshop gets a unit that suits the work.

How does it open, how is it shaded, and how is the outer pane washed?

Opening it

A fixed unit has no vent. For one that opens, a hand pole suits a low ceiling and a motor suits a high one, or a room where the vent sits over a worktop. An electric one runs on a motor and answers to a rocker switch fixed to the wall, or to a handset that can be kept out of small hands. Opening is a daily action in a household: someone chooses to open it when the kitchen steams up, and someone remembers to close it.

Rain and an open rooflight

If a manual vent is left open when the weather turns, rain can come in. On electric opening models from some makers a rain sensor is built in, and it closes the vent when rain is detected. Only those particular models include it; we name them at survey rather than presenting it as standard.

Rain on a frameless flat rooflight, seen from the room below

Shading it

Blinds for a flat rooflight are ordered against the unit's dimensions and make. A bedroom suits a blackout blind, a kitchen or office a softer pleated one, and a bathroom a blind made for damp rooms. For a ceiling out of reach, a motorised blind can be fitted, and certain systems link it to the vent's controls.

Washing the outside glass

On a flat rooflight the outer pane cannot be turned into the room as a centre-pivot roof window can. Someone washes it from outside: a ladder up to the roof edge will do, and so will a long pole fed with water from the garden. Standing on the glass is for walk-on units alone; nobody should step onto any other kind. A self-cleaning or easy-clean finish on the outer pane is the maker's own feature, found only on certain units, and the maker's instructions explain how it behaves.

At handover

At the end of the visit we go over how it opens, which blinds fit your unit and how the outer pane is washed, so the first use of the rooflight happens with someone beside you.

Can a rooflight go into my existing flat roof, or should I wait for the extension?

Cutting into an existing flat roof

An existing flat roof is built from joists, a deck, insulation and a covering. Opening it means cutting the deck, trimming the joists round the hole and carrying their ends on new timbers, then building the upstand and tying the covering into it. The ceiling below is opened too, and a lining finishes the shaft from the room. The run of the joists limits the sensible width of the opening. The sequence of the job is laid out in a short answer on cutting a rooflight into a flat roof that is already built.

Fitting during an extension build

When an extension is being built, the opening can be framed into the roof structure as it goes up, and the upstand can be formed with the rest of the roof. A rooflight on a new extension is judged along with the build itself, and we confirm its position with the council before work begins. For a household planning a kitchen extension, it is simpler to fix the rooflight position at the drawing stage than to cut it in afterwards.

Replacing an old or failed unit

An old rooflight is worth replacing when:

  • its seal has gone and moisture sits between the panes;
  • its plastic has crazed or yellowed;
  • the frame no longer closes or opens as it should.

The swap is made to suit the opening that is there, and the energy limits in the warmth chapter apply to the new unit. Ventilation is checked at survey. Units that have misted are covered on our page about misted rooflights. Where the upstand is sound and the right size, it can sometimes stay and take the new frame; where it is not, a new one is built, and we tell you which at survey rather than guess.

Existing roof or new extension
QuestionExisting flat roofNew extension
When is the opening made?Cut into the finished roofFramed in as the roof goes up
Who assesses planning?Checked against Class C limitsAssessed with the extension
What is disturbed?Ceiling, deck, covering round the holeNothing yet; it is new
Best moment to decideAt surveyAt drawing stage

Which consents does a flat roof rooflight call for: planning, Building Regulations or both?

Planning

In England, adding a rooflight or roof window to a house is usually permitted development under Class C, so it does not need a planning application, provided it meets the Class C limits and conditions. The unit's projection past the original roof slope's plane is one of those limits, so it is measured at survey. The limits in full are on our page about planning permission for a skylight.

A roof lantern is a different case. A roof lantern added to an existing flat roof usually stands well over 150 mm proud of the roof, so it normally falls outside Class C and needs planning permission unless the council confirms otherwise. We check this at survey. Our page on planning permission for a skylight on a flat roof goes through it for flat roofs in particular.

Other cases to know

  • Class C has no listed-building exclusion in England, so a listed house still has Class C planning rights, but a new or altered rooflight on a listed building will almost always need listed building consent, and that consent decides the job.
  • Flats and maisonettes have no householder permitted development rights; Class C applies to houses only. A rooflight on a flat needs planning permission (and usually the freeholder's consent).
  • Class C is not lost by being in a conservation area alone; the loss comes from an Article 4 direction, or from a condition on a previous planning permission, so the council is asked first.

Building Regulations

A new rooflight will generally need Building Regulations approval: the roof usually has to be cut and the opening trimmed and supported, the roof must carry the rooflight's weight or be strengthened, the rooflight must be energy efficient, and near a boundary its fire performance has to be considered. Where the work is notifiable, we handle the Building Regulations notification with the council's building control team or a registered building control approver. Escape routes and further detail are in the Building Regulations guide.

Where the 150 mm is measured

The 150 mm limit is taken outward from the plane of the original roof slope, measured at right angles to the roof surface, and the upstand and frame both count.

What happens between the survey and handover, and what is on paper at the end?

Surveying a flat roof

The survey costs nothing and precedes any figure. We measure the opening and the roof, check the joists, the fall and the covering, and find out what the room is for: how high the ceiling is, whether children live in the house, and who would open the vent. To begin sooner, WhatsApp 07880 284133 will take a photo of the roof. It also helps to know:

  • where the roof is reached from;
  • which rooms sit under it;
  • whether any drawings or building control papers exist for the extension.

We also look at what lies above and below the opening: the ceiling beneath, any pipes or cables that run through it, and the outlet the roof drains to.

The installation process

  1. Deck and joists. The deck is cut and the joists trimmed round the opening, their ends carried on new timbers.
  2. Upstand. The upstand is set, a ready-made insulated unit from the maker or a timber one framed on the roof.
  3. The unit. The rooflight goes onto the upstand and is fixed.
  4. Covering and flashing. The roof covering is tied into the upstand and the flashing is fitted, in the way that suits the material on your roof.
  5. Lining inside. Indoors the shaft is lined and finished.
  6. Handover walk-through. We run through the controls, lay out the blind choices for your unit and explain the washing routine.

The quote and the guarantee in writing

After the survey comes a fixed written quote, never before it. For each fitting we complete, a 10-year workmanship guarantee is in place, written down, and our guarantee page sets out what it covers.

Areas covered, local to Stockport

Our ground is Stockport and the country within about 30 road miles of it, taking in the north and east of Cheshire, the High Peak edge and the south and east of Greater Manchester. Inside the borough, planning is a matter for Stockport Metropolitan Borough Council; the areas page lists the towns. Houses and bungalows come first, in kitchen extensions, dining areas and family rooms, and small commercial work, a unit over a stockroom or a workshop for instance, is welcome with the same survey beforehand.

Price factors

What separates one flat rooflight quote from another

Book a free survey

The figure follows the survey, never a photo.

  • Size and typeA larger or bespoke unit takes more frame and glass.
  • GlazingDouble glazing or triple, with solar control or easy-clean finishes.
  • UpstandA ready-made insulated one from the maker, or a timber one framed on the roof.
  • Roof structureJoists to trim and carry, and how wide the opening runs.
  • CoveringThe material on the roof and how it joins the upstand.
  • InsideThe lining, the finish, a motor or a blind.

Flat roof rooflight FAQs

Can you put skylights on a flat roof?

Yes. A flat roof takes a rooflight on a raised upstand, whether the roof is old or part of a new extension. Opening the roof is structural work, so a survey comes first. Our answer on adding a skylight to an existing flat roof covers the order of work.

What is the best skylight for a flat roof?

It depends on the room, the ceiling height and who will open it. A fixed glass unit suits many kitchens, an opening one suits a room that wants a vent, and a lantern gives height. A comparison of the flat rooflight choices sets them side by side.

How much does a flat roof skylight cost?

Size, type, glazing, upstand, roof structure and the finish inside all move the figure, so it is set once the free survey is done, in a fixed written quote. Our answer on flat roof skylight cost takes each factor in turn.

Do I need planning permission for a skylight on a flat roof?

A house in England can usually take one as permitted development, inside set limits, but a lantern on an established flat roof normally needs permission, unless the council says otherwise. Our flat roof planning answer sets out the limits, and we check the height at survey.

Is the joint where a flat rooflight meets the roof weatherproof?

That joint matters most of all. The covering climbs the upstand and ends under the frame's trim, and how it is jointed depends on the material on your roof. Each material has its own section in our upstands and coverings guide.

Can I walk on a flat rooflight to clean it?

Only on one designed for it. Walk-on units are built to carry a person; ordinary fixed and opening glass is not. The outer pane is washed from the ground or the roof edge instead. See walk-on rooflights for the made-to-be-stood-on kind.

Can a flat rooflight have a blind?

Yes. Blinds are made to suit each unit's dimensions and make: blackout for bedrooms, softer pleated styles for kitchens and offices, and motorised ones for high ceilings. The options are laid out at handover.

Can an old flat rooflight be swapped for a new one?

Yes. A unit with a failed seal, crazed plastic or a frame that no longer works can be exchanged for a new one. A misted pane is covered on our misted rooflights page.

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  • Fixed written quote
  • We handle the Building Regulations notification where the work is notifiable
  • 10-year workmanship guarantee

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