Roof Lanterns

Daylight from above. A brighter, calmer room.

A roof lantern pours natural light into the centre of a space, turning dark kitchens and extensions into places you actually want to be. With slim sightlines, high-performance glazing and neat finishing, you get daylight without the glare and a room that feels “finished”, not makeshift.

We design, supply and fit across Grantham, Stamford, Sleaford, Newark, Bourne, Melton Mowbray and nearby villages.

Why Choose a Roof Lantern

Balanced daylight
Light drops into the heart of the room, not just from the side doors.
Slim, modern lines
Minimal bars and clean cappings for an uncluttered look.
Comfort all year
Solar control, low-e glazing and proper seals keep temperatures steady.
Great for kitchens
Brighten the island or dining table without harsh side glare.
Adds value and feel
Spaces look more architectural and feel more spacious.

Where Lanterns Work Best

  • Kitchen-diners and knock-throughs that need light in the middle

  • Single-storey extensions with a solid or warm roof deck

  • Orangeries where a perimeter ceiling frames the lantern beautifully

  • Home offices and garden rooms that benefit from steady, soft light

If you prefer glass without the raised profile, consider flat roof lights. We can show both options at survey.

Roof Lanterns

Sizes, Shapes and Layouts

Common shapes

Rectangular: perfect over an island or dining table
Square: centred feature for balanced rooms
Twin lanterns: for larger spans or zoned spaces

Typical spans

• Small feature (c. 1.0–1.5m x 1.5–2.0m)
• Family kitchen (c. 1.5–2.0m x 2.5–3.5m)
• Large room (up to system limits; we’ll advise at survey)

Bar layouts

• Ultra-slim profiles for maximum sky view
• Minimal ridge and hip bars to keep lines light

Where Lanterns Work Best

  • Kitchen-diners and knock-throughs that need light in the middle

  • Single-storey extensions with a solid or warm roof deck

  • Orangeries where a perimeter ceiling frames the lantern beautifully

  • Home offices and garden rooms that benefit from steady, soft light

If you prefer glass without the raised profile, consider flat roof lights. We can show both options at survey.

Roof Lanterns

Glazing & Performance Options

Thermal & solar control

• Low-e, argon-filled units for low U-values
• Solar control coatings to cut summer heat and glare
• Warm-edge spacers to reduce condensation at the glass edge

Noise & privacy

• Laminated or acoustic glass to soften rain and outside noise
• Satin/privacy glass for bathrooms and sensitive spaces

Self-clean coatings

• Photocatalytic layers help break down dirt so rain washes it away

Opening options

• Manual or electric roof vents for purge ventilation
• Rain and temperature sensors to close automatically
• Integrated blinds (manual or motorised) if you want extra shading

Finishing the Room Properly

A good lantern is as much about the finish as the glass.

  • Plastered perimeter pelmet with downlights

  • Neat internal trims and cills to match your décor

  • Discreet electrics with sensible switching and socket positions

Colour-matched external cappings for a clean roofline

How We Work

Survey and advice

We visit, measure properly, look at your existing frames and talk through finishes, glazing and hardware. It’s a conversation, not a sales pitch.

Clear written quote

You’ll get an itemised quote with the style, colour, glass spec, lead time and warranty. No vague “from…” pricing and no surprises later.

Made to measure

Every frame is built for your apertures. This is what keeps the installation neat and the seals tight.

Tidy fitting

We protect floors, remove old frames and glass, seal up neatly and clean down. Old materials are taken away. You’re not left with a skip.

Aftercare

If you ever need us, you don’t get pushed to a call centre. You speak to the same team who fitted the job.

Survey & advice

We measure properly, check roof type and joist layout, and talk through sizes, glazing and vents.

Itemised quote & drawings

Clear plan/elevation with spec, timelines and warranties. Any structural work or electrics are listed.

Made to measure

Lantern and glass manufactured to your opening for neat lines and tight seals.

Tidy installation

Opening formed (or existing checked), upstands prepared, lantern set, sealed and finished. Site left clean.

Aftercare

If you need anything, you speak to the same friendly team who fitted it.

Recent Installations

Serving Grantham, Stamford, Sleaford, Newark, Bourne, Melton Mowbray and nearby villages.

FREQUENTLY ASKED QUESTIONS

Roof Lanterns

Not with the right glass. Solar control coatings reduce heat gain while keeping daylight. We’ll recommend the best spec for your aspect.

Laminated/acoustic glass and proper seals keep noise down. Most clients find it pleasantly quiet compared to old polycarbonate roofs.

Replacing or adding a lantern on a single-storey extension often falls under permitted development if size and height limits are met. Conservation areas and specific house types can vary. We’ll advise before you commit.

 A warm, insulated flat roof deck or orangery roof with the correct upstand. We’ll check structure and advise on any strengthening.

Yes. Manual or electric vents are available, with optional rain/temperature sensors.

Self-clean coatings help. Occasional gentle wash from safe access keeps it clear. We’ll advise on maintenance.

Most single lantern installs are completed in a day once the opening is prepared. Larger or twin lantern projects can take longer. You’ll get a realistic schedule with your quote.

Yes. We can include lighting, switching and plastering or coordinate with your trades. Everything is itemised.

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I have been using Avanti for 35 years and the service and product quality is amazing!
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Will mcintosh
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Cannot recommend Avanti enough!! Amazing service from start to finish. The whole team were friendly and professional. Great job and have told all my family and friends if they ever need a job doing, to give them a call
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Natalie Buxton
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We had nine blown windows, called a couple of window companies to try and get the best price and these guys were the only ones who got back in touch with us. We weren't willing to wait around so went with them and I'm glad we did. They came out, took the measurements and ordered the glass. I was advised the glass could take about four weeks which was fine. Less than a week later I got a call asking if there was any chance they could come later today to fit our new windows! They came round and had them all replaced in about an hour!! For the first time since we've moved into our house we have been able to see properly out of our window! Thank you for the professional and prompt service! I would recommend.
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Lisa Knight
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We have this week had our windows installed courtesy of Avanti Windows Grantham. From start to finish we have had excellent service. I knew I was in safe hands when I met Richard who came out originally to measure up and quote, but to be honest everyone we have dealt with from Richard through to the fitting team have been spot on. Very professional. We did get quotes from other well known window suppliers but the out dated sales tactics and tedious process put us off. There was none of that with Avanti…. It was so easy. I would highly recommend them. I’d give 6 stars if I could👍🙏
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MARK GOODE
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Amazing firm and very professional. They’ve done a great job In replacing our conservatory roof for a solid one. Punctual everyday and end result it brilliant. Highly recommend
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George Pim
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Avanti delivers an outstanding service. I had a new glass roof fitted on my conservatory and the team also refurbished the whole conservatory and made it look like it was new. Fantastic job, exceeded my expectations. I have no hesitation in strongly recommending this company. A big thank you to the whole team at Avanti, a great bunch of guys!
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Douglas Howcroft
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Brilliant company. Quality windows. Staff really friendly and helpful.
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Chris Jones
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Absolutely over the moon with my windows and doors, service and fitting is top notch!! We will be having replacement windows from them in the future!!
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Toni Blakey
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A patio door leaked because they "forgot to put in drain holes". Ahe door got fitted by "trimming" the opening by wacking it with a lump hammer (even though the builder was on hand with a diamond saw), the windows came scratched and the external paint could be removed with a finger. I saw they hadn't sealed in the window frames and asked why not. Apparently they don't carry sealant!?!? They all got taken out and my builder rebuilt the door opening.
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Sheila and Peter
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Tony and the team were very professional throughout the whole process. The fitters had to install all new windows and doors and have completed to a high standard. They have been very accommodating with my timescales and would highly recommend. Thank you!
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Evie English

Conservatory Roof Replacements

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