How much does a Maxi-Flat rooflight cost?

As a guide, a Maxi-Flat rooflight starts from £1,399 for the 500 x 500mm guide size and £1,899 for the 1200 x 2000mm guide size. The final quote depends on measured opening size, roof build-up, colour, glazing, opening mechanism, access, and site conditions.

When is a flat rooflight better than a roof lantern?

A flat rooflight is better when you want overhead light with a lower external profile. A lantern is better when the raised roof feature is part of the design.

Why choose a single-panel flat rooflight?

A single-panel rooflight keeps the view cleaner because there are no dividing bars in the glass. It works best when the opening size suits one practical glass panel.

Can a flat rooflight open for ventilation?

Some flat rooflights can include opening or vent options. We confirm this during survey because the roof build-up and access affect the right specification.

Can a flat rooflight have an integrated blind?

It may be possible on suitable rooflight specifications. We check the rooflight size, kerb, glazing, controls, and whether the blind route fits the approved Cii product range before quoting.

Is a Maxi-Flat rooflight the same as a skylight?

Skylight is often used as a broad search term. The Maxi-Flat is a low-profile flat rooflight for flat roof openings, designed as a single glass panel rather than a raised roof lantern.

What is a flat rooflight?

It is a flat rooflight designed around a single glass panel format for projects where a flatter, lower-profile glazed roof is preferred.

When does a flat rooflight look better from outside?

It usually looks better where the roofline needs to stay quiet, such as a lower extension, a more modern rear elevation, or a roof that is visible from upstairs windows.

Can I still choose colours and glass upgrades on a flat rooflight?

Yes. Custom colour routes plus glass and vent upgrades are available, and we confirm the final combination during survey and quoting.

What should be ready before a flat rooflight is fitted?

The roof opening, kerb, fall, and weathering detail all need to be right. We check those details on survey before confirming the final size and specification.

Roof Lanterns

Maxi-Flat Rooflight

A low-profile flat rooflight supplied and fitted in Essex for overhead daylight without a raised lantern shape.

Essex supply and fit for flat roof openings
Maxi-Flat single-panel rooflight by our premium aluminium manufacturer
No dividing bars, uninterrupted views
Self-cleaning argon glass as standard

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020 8500 9100

10YEARGUARANTEE

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Guide Sizing

Compare the Maxi-Flat guide size range

The Maxi-Flat stays low profile, but the roof opening still needs to be measured properly. These guide sizes keep the starting price tied to the size being compared.

Made to measure

Single-panel rooflight sizes and starting prices

These are the sheet-backed guide sizes currently safe to show publicly. Final quote depends on the measured opening, roof build-up, glass route, colour, and whether an opening unit is needed.

500 x 500mm guide size

£1,399From

from price for the sheet's 500 x 500mm Maxi-Flat guide size

A compact fixed rooflight for smaller overhead daylight points where the external roofline needs to stay quiet.

Small low-profile rooflight
Fixed single-panel format
Survey checks kerb, fall, and weathering

1200 x 2000mm guide size

£1,899From

from price for the sheet's 1200 x 2000mm Maxi-Flat guide size

A larger single-panel rooflight route for more overhead daylight without moving to a raised lantern form.

Larger single-panel guide size
No dividing bars in the glass
Fixed or opening route checked at survey

Guide prices are starting points, not final quotes

Final size is surveyed from the prepared roof opening

Aluminium quotes are normally held for around 7 days

Guide prices exclude opening mechanisms, colour changes, specialist glazing, roof preparation, making good, and unusual site conditions. The written quote is confirmed after survey.

Technical Details

Specification and Options

Product fit

Best when the roofline should stay low and quiet

A flat rooflight is the lower-profile route for bringing light into an Essex extension without making the glazing a raised feature. It is often the better choice where planning, roof height, neighbouring views, upstairs sightlines, or a clean contemporary roofline matter.

Best fit for

Single-storey extensions where a raised lantern would look too prominent
Rooms needing overhead light without a strong external roof feature
Projects where the roof finish should stay clean, simple, and low profile

Consider another option when

A raised lantern would suit the extension as a visible feature
The room needs regular high-level ventilation
The glass needs to be walked over from a roof terrace or deck

What we check on survey

We check kerb height, roof fall, drainage, and weathering before confirming suitability.
We discuss solar-control glass where the room faces strong sun.
We confirm whether a fixed Maxi-Flat or an opening rooflight is the better route.

Useful comparisons

Hipped roof lanternsCompare the raised feature route for kitchens and flat roof extensions.Pyramid lanternsCompare the raised symmetrical lantern route for square openings.Maxi-Sky rooflightsCompare a wider flat rooflight route with a slim central bar.Opening rooflightsCompare overhead daylight with manual or electric ventilation.Walk-on rooflightsCompare structural roof glazing for terraces, decks, and usable roof areas.

Optional Upgrade

Integrated blind control for flat rooflights

Flat rooflights can bring a lot of daylight into a kitchen or extension. An integrated rooflight blind adds a cleaner way to manage glare, summer brightness, and privacy from above while keeping the low-profile rooflight look.

Close-up of an integrated blind inside a flat rooflight unit

Overhead shading

A discreet blind inside the rooflight unit, with suitability confirmed before quote.

Useful on flat rooflights when

The rooflight sits over a kitchen, dining area, or workspace
Strong sun creates glare or summer heat build-up
Neighbouring upper floors overlook the roof glazing

Blind types we can discuss

Integrated rooflight blinds

Rooflight-specific blinds are planned with the overhead glazing, kerb, and control route.

Electric control

Remote operation is normally the practical route for roof glazing that cannot be reached by hand.

What we check

Rooflight size, kerb detail, and compatibility
Room orientation, glare, and summer heat build-up
Power, access, controls, and maintenance expectations

Rooflight blind options are electric and survey-led. We do not publish supplier offers or prices because final specification depends on the product route.

Ask about rooflight blind upgrades

Free Survey

Ready to shortlist this product properly?

If this looks like the right fit, we can survey the opening, confirm the specification, and price it properly for your home with no obligation.

Free surveyFixed quoteDirect Cii installation team

Get a free quote 020 8500 9100

The Maxi-Flat Rooflight is a single-panel flat glazing solution for Essex extensions where the room needs overhead daylight but the roofline should stay low and quiet. Built by our premium aluminium manufacturer using the same slim aluminium Maxilite system as the hipped lantern range, one continuous glass panel means no dividing bars, more light, and a cleaner external finish than a raised lantern. We survey the prepared roof opening, kerb, roof fall, drainage, glass route, colour, and whether a fixed or opening unit is the better fit before confirming the written quote.

Key Specifications

Single glass panel design, no bars, more light and uninterrupted views

Self-cleaning, argon-filled glass with warm-edge spacers as standard

Four glass tints for glare and solar heat control

Electric and thermostatically controlled vent options

5-day express manufacturing lead time from our premium aluminium manufacturer

Built to your exact opening dimensions, not a fixed size

CII handles the survey, quote, and installation from start to finish

How It Works

From Survey to Sign-off

Step 1

Survey

We visit, measure, and advise on the right configuration for your property.

Step 2

Install

Our Cii team installs with clean, tidy workmanship.

Step 3

Sign-off

Final checks, handover, and Assure certification where required.

Next Step

Want a fixed quote from a real survey?

We will measure up, talk through finishes and installation details, and give you a clear quote based on the actual opening rather than a generic estimate.

Free surveyFixed quoteDirect Cii installation team

Get a free quote 020 8500 9100

Checkatrade

“CII fitted our roof lantern on the rear extension. Excellent craftsmanship, very professional team, and the room is transformed. Highly recommended.”

Google

“Roof lantern fitted over our orangery. The light it brings in is incredible. The installation team were excellent and left the site spotless. Highly recommend CII.”

Google Reviews