Rooflight and skylight questions, answered
Quick answers on rooflights and skylights: noise, glazing, regulations and what to expect on the day of the fit.
How long does a rooflight last?What wears out first on a rooflight, how glass and plastic age differently, and how to tell yours is near the end.
Is it worth replacing an old skylight?A straight answer on when replacing an old skylight pays back in warmth, dryness and quiet, and when the old unit has years left.
Can I add a rooflight under permitted development?The projection and height limits that keep most house rooflights out of planning, and the homes where permitted development does not apply.
Does a new rooflight need Building Control sign-off?Why a new rooflight opening is notifiable work, which Parts of the regulations apply and what the notification covers.
Is replacing a rooflight notifiable under Building Regulations?How a glass-only swap, a whole-unit swap and a bigger opening each sit with Building Control, and what we notify for you.
Are skylights noisy in the rain?Why some skylights drum in rain and others stay calm, and the glass, seal and upstand choices behind the difference.
Rooflights and skylights in general 32
- How long does a rooflight last?
- Is it worth replacing an old skylight?
- Can I add a rooflight under permitted development?
- Does a new rooflight need Building Control sign-off?
- Is replacing a rooflight notifiable under Building Regulations?
- Are skylights noisy in the rain?
- Can you hear planes through a skylight?
- Is laminated glass quieter than toughened glass?
- Does triple glazing make a rooflight quieter?
- Does a blind reduce rain noise under a skylight?
- What is the difference between a rooflight and a roof window?
- Should I choose a skylight or a roof lantern?
- Do skylights add value to a house?
- How many rooflights does a room need?
- How long does it take to replace a skylight?
- How long does it take to fit a new rooflight?
- Can a skylight be replaced from inside the house?
- Will replacing a skylight damage my ceiling?
- Can you put a bigger rooflight in the same opening?
- Should I replace all my rooflights at once?
- Can I replace a plastic dome skylight with glass?
- Do rooflights cause condensation?
- Will a skylight in a bedroom wake me at dawn?
- What should a quote for a new rooflight include?
- Do skylights let in more noise than windows?
- Does Crawley Borough Council need to approve a rooflight?
- What is the best time of year to fit a skylight?
- Can a skylight be installed in the rain?
- Do you need scaffolding to replace a skylight?
- Does a rooflight need a structural engineer?
- Is acoustic glass worth it for a rooflight?
- What should I ask a skylight installer before booking?
Roof lanterns 21
- Is a roof lantern louder in heavy rain than a flat rooflight?
- Does a roof lantern need planning permission?
- How high does a roof lantern sit above the roof?
- Can a roof lantern go on a pitched roof?
- Why does a roof lantern get condensation on the inside?
- How do you clean a roof lantern safely?
- Can a roof lantern have opening vents?
- Are roof lanterns energy efficient enough for Part L?
- Does a roof lantern make a kitchen too hot in summer?
- What is the best glass for a roof lantern?
- Is a roof lantern strong enough for snow?
- Can a roof lantern go into an existing flat roof?
- Which roof lantern shape suits a long, narrow extension?
- Why do some roof lanterns have tie bars?
- Is a roof lantern better than a fully glazed roof?
- What colour roof lantern frame looks best?
- Can a roof lantern have blackout blinds?
- Does a roof lantern need a steel beam around the opening?
- Should the inner pane of a roof lantern be laminated?
- Can a roof lantern be made to measure?
- Can you put lights inside a roof lantern?
Flat roof rooflights 21
- How high should a flat rooflight upstand be?
- Can you put a rooflight in an existing flat roof?
- Why does water sit on my flat rooflight?
- How close to a party wall can a flat rooflight go?
- What is a builder's upstand for a rooflight?
- Can a flat rooflight go on a shallow pitched roof?
- How do you clean a flat rooflight?
- Can a flat rooflight have obscure glass for privacy?
- Is a flat glass rooflight better than a dome?
- Does every flat rooflight need a kerb?
- Does my flat roof need to be insulated for a new rooflight?
- What size flat rooflight suits a single storey extension?
- Is a flat rooflight a good idea in a bathroom?
- What glass should a flat rooflight have?
- What happens to a flat rooflight in snow and falling leaves?
- Can a flat rooflight go on a garage roof?
- Can you fit a blind to a flat rooflight?
- Can a flat rooflight be long and narrow?
- Is a double skin or triple skin dome rooflight warmer?
- Can a flat rooflight light a stairwell under a flat roof?
- Do the joists need cutting for a flat rooflight?
Roof windows 21
- How is a roof window fitted into a tiled roof?
- How big does a roof window need to be for a fire escape?
- Are roof windows noisy in the rain?
- Which way should a roof window open?
- Can you put a roof window in a bathroom?
- Do roof windows need trickle vents?
- Is a roof window worth fitting on a north-facing roof?
- How do you clean the outside of a roof window?
- Can a roof window be fitted between rafters without cutting them?
- What is a roof window balcony?
- Should a loft bedroom roof window have laminated glass?
- Should you choose a roof window or a dormer for a loft?
- Can you fit a roof window in a flat roof?
- How close to the ridge can a roof window go?
- Can you leave a roof window open in the rain?
- Does a roof window need the rafters trimmed?
- Can a roof window be fitted to a slate roof?
- What blind is best for a roof window in a nursery?
- Is a roof window a good idea over a staircase?
- Should a roof window be fitted by a professional?
- Why does a roof window get condensation on the inside?
VELUX windows 21
- Where is the data plate on a VELUX window?
- Can a VELUX sash be replaced without changing the frame?
- Will a new VELUX fit my old VELUX opening?
- How do you clean a VELUX window?
- What is a VELUX conservation roof window?
- Do VELUX blinds reduce noise?
- What does the VELUX rain sensor do?
- Can a manual VELUX be converted to electric?
- Which VELUX blind is best for a bedroom?
- Can you fit a VELUX in a flat roof?
- What is a VELUX awning blind for?
- How do I find my VELUX size if the data plate is missing?
- Can VELUX windows be fitted side by side?
- What does the VELUX size CK02 mean?
- Can a VELUX be upgraded to quieter glass?
- Do VELUX INTEGRA windows need an electrician?
- How long does a VELUX window last before it needs replacing?
- Can you paint a VELUX window?
- How does a VELUX warranty differ from an installer's guarantee?
- Which VELUX is best for a low-pitched roof?
- Can a VELUX be fitted in a loft that is not converted?
Electric and opening rooflights 21
- Do electric rooflights close by themselves when it rains?
- What happens to an electric rooflight in a power cut?
- Can a fixed rooflight be swapped for one that opens?
- Are electric rooflights noisy when they open and close?
- Does an electric rooflight need an electrician?
- Do opening rooflights let in more noise than fixed ones?
- How big can a sliding rooflight be?
- Is a sliding rooflight watertight when it is closed?
- Does a roof access hatch need Building Regulations approval?
- Can an opening rooflight be used as a fire escape?
- Is an opening rooflight safe in a house with young children?
- Can an electric skylight work with Alexa or Google Home?
- How long does an electric rooflight motor last?
- Can you fit a blind to an electric rooflight?
- Do electric rooflights come with insect screens?
- Is an electric rooflight worth it over a manual one?
- What affects the cost of an electric rooflight?
- Can an opening rooflight help cool a house in summer?
- Does an opening rooflight need a taller upstand?
- Can an electric rooflight have acoustic laminated glass?
- Can a manual opening rooflight be motorised?
Energy efficient rooflights 21
- What is the difference between a whole-unit and a centre-pane U-value?
- Is a triple glazed rooflight too heavy for my roof?
- Does solar control glass make a room darker?
- Why does my skylight make the room feel cold in winter?
- Does a replacement rooflight have to meet current U-value rules?
- Can rooflight glass stop furniture fading?
- Are glass rooflights more energy efficient than polycarbonate?
- Will energy efficient rooflights lower my heating bills?
- What does argon gas do inside a rooflight?
- What is a g-value on rooflight glass?
- What does light transmittance mean on a rooflight?
- What is cold bridging around a rooflight?
- Can an old rooflight be upgraded to be more energy efficient?
- Does a thermal blind help keep a rooflight room warm?
- Is there a limit on rooflight area under Part L?
- Does an energy efficient rooflight improve my EPC?
- Are energy efficient rooflights quieter too?
- Does acoustic laminated glass change a rooflight's U-value?
- What affects the cost of an energy efficient rooflight?
- Can a rooflight help warm a room in winter?
- Do rooflights have energy ratings like windows?
Misted and failed rooflight replacement 21
- Can a misted skylight be fixed, or does it need replacing?
- Is a misted rooflight dangerous?
- How can I tell if my rooflight glass is laminated?
- Is a cracked skylight an urgent job?
- What causes rooflight glass to crack?
- Does a misted skylight let in less light?
- Will a misted rooflight clear up by itself?
- Can misted skylight glass be demisted?
- Is a misted rooflight covered by its original guarantee?
- What does a blown double glazed unit in a skylight mean?
- Can a single misted pane in a roof lantern be replaced on its own?
- Why has my new rooflight misted on the room side?
- Does a cracked outer pane mean rain can get into a rooflight?
- Can a failed fixed rooflight be replaced with an opening one?
- Should a failed rooflight unit be replaced with laminated glass?
- Will a replacement glass unit make my rooflight quieter?
- Can you get a replacement unit for a skylight that is no longer made?
- Why is only one pane of my rooflight misted?
- Can a misted rooflight cause damp in the room?
- Does rain sound louder through a failed rooflight?
- How long does a replacement glass unit take to arrive?
Walk-on rooflights 21
- Is a walk-on rooflight safe to stand on?
- Is walk-on glass slippery when wet?
- How thick is walk-on glass?
- Can walk-on glass crack?
- Can you put furniture or plant pots on a walk-on rooflight?
- Can a walk-on rooflight be opened?
- Does walk-on glass get hot underfoot in summer?
- Does frost or snow affect walk-on glass?
- Can a walk-on rooflight go over a kitchen extension?
- Can you walk on a normal flat skylight?
- Can walk-on glass be obscured for privacy?
- Do walk-on rooflights let in less light than ordinary rooflights?
- Is a walk-on rooflight quieter than a standard flat rooflight?
- Can a walk-on rooflight be fitted to an existing roof terrace?
- How is a walk-on rooflight held in place?
- Is walk-on glass energy efficient?
- Does a walk-on rooflight need a drainage fall?
- Can you have LED lights in a walk-on rooflight?
- Does walk-on glass scratch?
- Why is walk-on glass so heavy?
- Can a walk-on rooflight sit between existing roof joists?
Conservation rooflights 21
- Do I have to use a conservation rooflight in a conservation area?
- Can you put a rooflight in a listed building?
- Do conservation rooflights open?
- What is the difference between a conservation rooflight and a standard roof window?
- Are conservation rooflights double glazed?
- What colour should a conservation rooflight be?
- Can a conservation rooflight have an electric opener?
- Will a planning officer accept more than one conservation rooflight?
- Can a conservation rooflight go on the front of the house?
- Are conservation rooflights noisy in the rain?
- Can you fit a blind to a conservation rooflight?
- Should an old cast iron rooflight be replaced with a conservation rooflight?
- Do conservation rooflights get condensation?
- Can a conservation rooflight be used as a fire escape?
- What roof pitch does a conservation rooflight need?
- Does an Article 4 direction affect adding a rooflight?
- Is a heritage rooflight the same as a conservation rooflight?
- Can a conservation rooflight go in a thatched roof?
- How do you clean a conservation rooflight?
- Can a conservation rooflight have laminated glass?
- What does a conservation officer look for in a rooflight?
Sun tunnels 21
- Do sun tunnels work on cloudy days?
- Do sun tunnels give any light at night?
- Are sun tunnels worth it?
- Does a sun tunnel need planning permission?
- Does a sun tunnel need Building Regulations approval?
- How long does it take to fit a sun tunnel?
- Can a sun tunnel pass through an upstairs room?
- Is a sun tunnel easier to fit in a bungalow?
- How is a sun tunnel kept watertight on the roof?
- Can you hear aircraft through a sun tunnel?
- Do sun tunnels make a room hot in summer?
- Can a sun tunnel light a kitchen?
- How much light does a sun tunnel give?
- Can a sun tunnel go in a bathroom with an extractor fan?
- How do you clean a sun tunnel?
- Can you dim a sun tunnel?
- Can a sun tunnel go on a north-facing roof?
- Can you fit a sun tunnel if you have a loft conversion?
- Which is better, a glass or acrylic sun tunnel dome?
- Can an old sun tunnel be replaced with a newer one?
- Does a sun tunnel affect fire safety in a loft?
Short, straight answers to what homeowners ask before and after a rooflight or skylight goes in. Each one is brief, with a link onward if you want the full guide on that topic, written in the same plain way.
Questions about what happens if something fails are covered by our guarantee, and price questions by the costs page. If yours is not here, please ask us directly.