Answers
Skylight and rooflight questions answered
Short, direct answers to the questions people ask before fitting a rooflight.
- ANSWERS:
- 33
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Featured
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SKYLIGHTS AND ROOFLIGHTS
How much does a skylight cost to fit?
What a skylight costs to fit depends on four things: the kind of unit, the size of the opening and whether it already exists, the roof it goes into, and whether planning or Building Regulations paperwork comes into it. Every house changes the sums, which is why we survey for free and then give you a fixed written quote. 6 min read
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ROOF LANTERNS
How much does a roof lantern cost?
A roof lantern's cost is set by its size and shape, the frame and glass you choose, the state of the flat roof and upstand it sits on, the structural work needed to make or alter the opening, and whether a planning application is needed. Those change from one house to the next, so we price after a free survey and give you a fixed written quote. 6 min read
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FLAT ROOF ROOFLIGHTS
How much does a flat roof skylight cost?
What a flat roof skylight costs depends on the type of rooflight, its size and glazing, whether it opens, and what the roof underneath needs for the opening. Those vary from one roof to the next, so the figure comes once we have surveyed the roof, free of charge, and it reaches you as a fixed written quote. 5 min read
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ROOF WINDOWS
How much do roof windows cost?
No single figure covers every roof window, because the price follows the size, the way the window opens, the glass and the roof it goes into. Swapping a window in an existing opening is not the same work as cutting a new one in the slope. We price after a free survey and give you a fixed written quote. 6 min read
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VELUX WINDOWS
What is the average cost of a VELUX window?
No average holds for a VELUX window, because the distance between a small fixed window and a large electric one in a slate roof is too wide for any single number. Price follows the size code, the way it opens, the glazing and the roof beside it. We give a fixed written quote after a free survey. 6 min read
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ELECTRIC OPENING ROOFLIGHTS
How much does an electric opening rooflight cost?
The cost of an electric opening rooflight is set by the unit itself, its size and glazing, the motor and controls, the way it is powered, and the roof it goes into. Those vary from house to house, so we give no price in advance. We survey for free and then give you a fixed written quote. 6 min read
Skylights and rooflights 3
- AnswerHow much does a skylight cost to fit?What a skylight costs to fit depends on four things: the kind of unit, the size of the opening and whether it already exists, the roof it goes into, and whether planning or Building Regulations paperwork comes into it. Every house changes the sums, which is why we survey for free and then give you a fixed written quote.6 min read
- AnswerHow much does it cost to replace a rooflight?What it costs to replace a rooflight depends on which job you have: new glass in the existing frame, a like-for-like unit in the existing opening, or a different size that means altering the opening. The survey settles that, and a fixed written quote follows.6 min read
- AnswerWill a skylight leak in heavy rain?A skylight is built to keep rain out, and whether it does depends on three things: a unit that suits the pitch of the roof, a flashing or upstand fitted to suit it, and a roof around it that drains. Water inside the room is not always a leak, since condensation and mist between the panes are different matters.5 min read
Roof lanterns 3
- AnswerHow much does a roof lantern cost?A roof lantern's cost is set by its size and shape, the frame and glass you choose, the state of the flat roof and upstand it sits on, the structural work needed to make or alter the opening, and whether a planning application is needed. Those change from one house to the next, so we price after a free survey and give you a fixed written quote.6 min read
- AnswerWhat are the disadvantages of roof lanterns?A roof lantern has real drawbacks: it normally needs planning permission on an existing flat roof, it lets in summer heat, it can run with condensation in cold weather, it needs an upstand and a flat roof that drains, and its glass is hard to reach for cleaning. Each can be kept small by design, and a survey shows which apply to your roof.5 min read
- AnswerAre roof lanterns noisy in the rain?A roof lantern can be heard in the rain, and the glazing is the part you get to choose. How much reaches the room also depends on what the room is used for and how it is furnished. Manufacturers such as VELUX list rain noise reduction among their glazing options, so we settle the specification at the free survey and give you a fixed written quote.5 min read
Flat roof rooflights 3
- AnswerHow much does a flat roof skylight cost?What a flat roof skylight costs depends on the type of rooflight, its size and glazing, whether it opens, and what the roof underneath needs for the opening. Those vary from one roof to the next, so the figure comes once we have surveyed the roof, free of charge, and it reaches you as a fixed written quote.5 min read
- AnswerCan you put a skylight in an existing flat roof?Yes, a rooflight can be fitted into an existing flat roof. The roof must be opened up and, where needed, strengthened, the glass must satisfy the energy rules, and the planning and Building Regulations position has to be settled before any work starts. Some Welsh houses need a planning application and some do not, so the survey establishes which applies to yours.5 min read
- AnswerWhy does water sit on my flat rooflight?Water sits on a flat rooflight when nothing tilts it towards an outlet. The glass may be set too level, the roof beside it may fall the wrong way, or the route to the drain may be blocked or too shallow. Where the puddle forms tells you which, and a look at the rooflight, its upstand and the falls across the roof settles the rest.6 min read
Roof windows 3
- AnswerHow much do roof windows cost?No single figure covers every roof window, because the price follows the size, the way the window opens, the glass and the roof it goes into. Swapping a window in an existing opening is not the same work as cutting a new one in the slope. We price after a free survey and give you a fixed written quote.6 min read
- AnswerDo roof windows need planning permission in Wales?A roof window on a house in Wales can be permitted development, so no planning application is needed, if it stands no more than 150 mm proud of the original roof slope and sits no higher than the top of the original roof. In a conservation area, the Gower AONB, Bannau Brycheiniog National Park or a World Heritage Site, a new rooflight in the slope needs planning permission.5 min read
- AnswerAre roof windows a good idea?For a sloping room that needs light, a roof window is a sound choice: the glass sits in the roof itself, lights the room from above and can open for air. The trade-offs are rain noise, condensation in steamy rooms, glass that is awkward to reach, and the work of opening up the roof. A survey shows whether your roof and room suit one.6 min read
VELUX windows 3
- AnswerWhat is the average cost of a VELUX window?No average holds for a VELUX window, because the distance between a small fixed window and a large electric one in a slate roof is too wide for any single number. Price follows the size code, the way it opens, the glazing and the roof beside it. We give a fixed written quote after a free survey.6 min read
- AnswerCan you swap an old leaking VELUX for a new one?An old VELUX that lets water in can be taken out and replaced with a new roof window. First the survey works out where the water is getting in, because the window, the flashing around it and the covering beside it can each be the cause. After the free survey you get a fixed written quote.6 min read
- AnswerHow long does a VELUX take to fit?The time a VELUX takes depends on the job, so we give no figure over the phone. Swapping a window in an opening that already exists asks for less than forming a new opening in the slope, and the roof covering, the pitch and any wiring change the picture again. The free survey looks at each, and the length of the job can be talked through then.5 min read
Electric opening rooflights 3
- AnswerHow much does an electric opening rooflight cost?The cost of an electric opening rooflight is set by the unit itself, its size and glazing, the motor and controls, the way it is powered, and the roof it goes into. Those vary from house to house, so we give no price in advance. We survey for free and then give you a fixed written quote.6 min read
- AnswerDo electric rooflights close when it rains?VELUX says the roof windows it sells as solar or electric have a built-in rain sensor that closes the sash automatically when it rains. On other electric units the sensor varies by maker and model, so ask for it by name at the survey.5 min read
- AnswerElectric or manual: which opening rooflight is better?Reach decides it. A rooflight you can stand under and touch opens well by hand, and a motor adds little there. One above a stairwell, a high ceiling or a worktop you cannot lean across suits an electric opener, ideally with a rain sensor. We look at the room and the roof at a free survey, then give you a fixed written quote.6 min read
Energy-efficient rooflights 3
- AnswerDoes an energy-efficient rooflight cost more?Yes, a better-rated rooflight usually adds to the price of the unit itself, because the extra glazing layers and coatings cost more to make. The opening, the upstand and the weathering around it are a separate matter, and they depend on your roof. You get a figure only after a free survey, in a fixed written quote.6 min read
- AnswerWhat U-value should a rooflight have in Wales?For a rooflight in an existing Welsh home, Approved Document L (Wales) says the U-value should be no worse than 2.2 W/m²K. A roof window has a tighter figure, 1.4 W/m²K or Window Energy Rating band B. The lower the number, the less heat passes through the glass. Which one applies depends on how the unit sits in the roof.5 min read
- AnswerDo rooflights lose a lot of heat?A rooflight is a window in the roof, and glass lets heat out more readily than a solid insulated roof does. How much escapes depends on the glazing, the frame, the kerb and the fit. Units that meet Welsh guidance, with double or triple glazing and a well-built upstand, keep the loss in check. The survey tells us which suits your room.6 min read
Misted rooflight replacement 3
- AnswerHow much does it cost to swap a misted rooflight unit?What a misted rooflight swap costs depends on whether only the sealed glass unit is replaced or the whole rooflight, the size of the unit, the glass you choose and the condition of the frame, kerb and flashing around it. Only the roof can settle those, so we survey for free and give a fixed written quote.7 min read
- AnswerIs a misted rooflight a problem, or just ugly?A misted rooflight is a fault in the glass unit, not a leak. Moisture between the panes means the sealed gap is no longer sealed, and no amount of wiping will reach it. Mist by itself says nothing about the roof, but a stain on the ceiling or lining would, so the weathering around the glass gets checked too.6 min read
- AnswerHow long do rooflight sealed units last?No single number of years fits every rooflight sealed unit. A unit lasts until its seal lets go, and the sign is moisture between the panes. A figure for a particular unit has to come from its maker, and our survey reads the condition of the one in your roof.6 min read
Walk-on rooflights 3
- AnswerHow much does a walk-on rooflight cost?A walk-on rooflight's cost comes from the size of the glass, how the unit is built, the kerb and roof structure under it and the paperwork. Each terrace, lightwell or walkway differs on those points, so the figure follows a free survey and arrives as a fixed written quote.6 min read
- AnswerCan you walk on a skylight?Only on a walk-on rooflight, which is a separate product from an ordinary skylight. Walk-on glass is made to carry people and is fitted to a roof that can take the load. A roof window, a lantern or a standard flat roof rooflight is made to let light in, so treat it as something to keep your weight off.6 min read
- AnswerAre walk-on rooflights slippery when wet?Smooth glass is slippery when wet, which is why walk-on units are usually given a grip finish on the top face. How much grip you get depends on the finish the maker uses, so ask what it is before ordering. Falls on the terrace around the glass, and a clean surface, matter just as much on a wet day.6 min read
Conservation rooflights 3
- AnswerHow much does a conservation rooflight cost?The price of a conservation rooflight depends on its size and frame, the glazing you choose, whether it opens, the work in the slate roof around it, and any consents the house needs. Those vary from one roof to the next, so we survey for free before pricing and give you a fixed written quote.6 min read
- AnswerConservation area rooflights: is planning needed in Wales?Yes. In Wales, putting a rooflight into a roof slope in a conservation area is not permitted development, so the house needs a planning application. The same applies inside the Gower AONB, in Bannau Brycheiniog National Park and within a World Heritage Site. A listed house also needs listed building consent where the work affects its character.6 min read
- AnswerWhat is a conservation rooflight?A conservation rooflight is a rooflight made for older roofs, with a slim frame that sits low in the slope instead of standing out from it. It suits slate roofs on period homes, listed buildings and houses inside protected land. In Wales the planning route for one can start earlier than owners expect, so the survey looks at the roof and the paperwork together.7 min read
Sun tunnels 3
- AnswerHow much does a sun tunnel cost?What a sun tunnel costs depends on the length and route of its tube, the tube width, the roof covering the dome is sealed into and what the roof space holds. Those vary from house to house, so we start with a free survey and then give a fixed written quote. A tube cannot be priced until someone knows where it has to go.6 min read
- AnswerHow long does a sun tunnel take to fit?The time a sun tunnel takes to fit depends on the roof, the roof space, the route of the tube and the ceiling, so there is no single figure to quote. The work happens in three places, and the free survey shows what each one involves in your house. Planning, where a house needs it, has to be settled before any fitting starts.6 min read
- AnswerDo sun tunnels work on cloudy days?Yes, a sun tunnel works on a cloudy day, though it brings in less daylight than it does under a bright sky. The dome gathers whatever light the sky is giving, and the mirrored tube carries it down to the ceiling. The amount that arrives follows the weather, how far the tube runs and the room it serves, so each house is judged on its own roof.6 min read
Each answer opens with the reply in a few lines, then adds the detail behind it: noise in heavy rain, whether a roof window suits a bathroom, if a flat roof can take a skylight, what to do about an old unit that leaks. When a question needs a look at your roof to settle, the free survey is the next step. Book one here.
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