Lightweight Conservatory Roofs and What Your Frame Can Carry
Lightweight is a claim a manufacturer makes about a system, not a material you can buy. Two systems on the UK market publish a kilogram figure to back it. Here is what they weigh, what the weight actually decides, and why the number that matters is not on the roof at all but inside your existing frames. The full family of coverings sits on alternative conservatory roofs.
Published solid roof system weight · finished roof, per square metre
31 to 38 kg/m² the only two systems that publish one
Reasonably evidencedUltraframe published weights, 1 manufacturer, 2 systems · 1.23× across the two · checked 20 August 2026
What does lightweight mean on a conservatory roof?
It means the finished roof weighs 31 to 38 kg per square metre, on the two systems in the UK market that publish a figure at all. We grade that Reasonably evidenced: it is manufacturer technical data rather than a third-party estimate, but it comes from one manufacturer covering two of its own products, and the rest of the market publishes nothing. Checked 20 August 2026.
The word is doing a job in a sales conversation. A conservatory frame was designed to hold up glazing, so every solid roof sold onto an existing frame has to argue that it is light enough to go there. “Lightweight” is that argument compressed into one word, and it is not regulated, not defined and not measured to any common standard. Two manufacturers back it with a number. The others assert it.
That distinction matters more than it sounds, because the weight of the roof is not what usually stops a job. The load a solid roof adds is small and well documented. What is not documented, on any conservatory anywhere, is whether the frames underneath it were built to carry it. That is the whole argument of this page. If you want a figure for your own roof first, you can work out what your roof will cost and read on for what the weight changes.
Which systems are genuinely light, and what each one weighs
Two published weights exist. We are not going to fill the rest of the column with estimates, because an invented kilogram figure on a structural page is exactly the failure this site is built against.
| System | Published weight | Construction | Evidence |
|---|---|---|---|
| Ultraframe LivinROOF | 31 kg/m² | Hybrid solid and glass panels, thermally broken rafters, EPS plus twin PIR | Manufacturer |
| Ultraframe UltraRoof380 | 38 kg/m² | Box eaves beam, hidden aluminium frame, SIP panels, polypropylene slates | Manufacturer |
| SupaLite | not published | Aluminium sub-frame, EPS between rafters plus PIR and plasterboard | Gap |
| Guardian Warm Roof | not published | Aluminium rafter profile, phenolic insulation, ply, tiles | Gap |
| Equinox | not published | Aluminium, GRP sheet tiles or composite slate, pitches 5 to 35 degrees | Gap |
| Leka | not published | GRP rafters, the only non-aluminium frame in this set, PIR sheets | Gap |
Weights: Ultraframe technical literature, the only manufacturer in this category publishing any. Constructions: manufacturer technical literature and, for Ultraframe Classic and Loggia, BBA 96/3261 and Ultraframe's own product pages. Checked 20 August 2026. Four of the six systems most often described as lightweight publish no weight at all, and we show that as a gap rather than filling it in.
What would close it: a written weight per square metre for the finished build-up, in the manufacturer's own technical manual, for SupaLite, Guardian, Equinox and Leka. Ask for it, in writing, before you sign. The specification of the system most often sold as the light one is set out on SupaLite conservatory roofs.
Two names that are not lightweight roofs at all
Ultraframe Loggia is an insulated structural column system, rebranded Super Insulated Columns. The manufacturer's own wording is that your chosen roof sits on top of the columns. Its published 0.15 W/m²K is a column figure, not a roof figure. Ultraframe Classic is a glazed aluminium roof: BBA 96/3261 lists its glazing as 25mm or 35mm sevenwall polycarbonate, or a 24mm low-E argon sealed unit. Both are routinely listed as solid roof systems in comparison articles, and neither is one.
Weight against U-value, and why they pull apart
Insulation is what a solid roof is for, and insulation is thickness, and thickness is weight. Every system in this market is a negotiated position between those two, and the compliance floor is what sets where the negotiation starts.
| System | Published U-value | What the document says |
|---|---|---|
| Leka | 0.10 W/m²K | Claimed “as low as”. No build-up published for the figure |
| Ultraframe UltraRoof380 | 0.15, 0.12 option | Current figures. A 2018 process guide said 0.16 and 0.13 |
| Ultraframe LivinROOF | 0.15, 0.12 option | Manufacturer technical data |
| Equinox | 0.15 | “As low as”. No insulation thickness stated |
| SupaLite | 0.15, or 0.18 | Marketing says 0.15, or 0.12 enhanced. The certificate says 0.18. Both are real documents |
| Guardian Warm Roof | 0.18 maximum | 40mm phenolic between rafters, 25mm between battens, 60mm insulated plasterboard |
Published range across the eight named systems: 0.10 to 0.18 W/m²K, a 1.8× spread, Well evidenced across eight systems, checked 20 August 2026. Source: manufacturer technical literature and certification documents, cited individually above.
Two readings of that table are worth having. First, almost everything clusters at 0.15 because 0.15 is the England limiting value for a replacement roof, so it is the entry ticket rather than a selling point. Guardian's 0.18 does not meet it, which makes it a legacy figure and a legitimate thing to ask about. Second, the best claimed figure in the market, 0.10, comes with the least published detail. We attribute it rather than assert it. The regulation behind all of this is the 0.15 W/m2K roof standard.
For scale: the best polycarbonate sold in the UK, 55mm tenwall, reaches 0.83 W/m²K, more than five times the 0.15 limiting value.
We will not write “LABC approved”, and here is why
Every publicly downloadable LABC or LABSS certificate we could find in this category is expired on its face: Guardian EW320 to 8 August 2016, SupaLite EW277 to 26 June 2016, Equinox EW606 to 19 July 2017. LABC's live register is members-only, so current validity cannot be checked from outside. The only current dated approvals we located are 12-month Stroma Building Control certificates: UltraRoof380 number 14001 and LivinROOF number 14018, both issued 19 January 2026 and expiring 19 January 2027. Ask for a certificate number and its validity window, not an adjective.
What your frame can carry
This is the section the weight claim exists to serve, and the answer is more reassuring than the sales pitch and more awkward than it looks.
LABC's own addendum on solid roofs to conservatories, published May 2018, puts the load added by a lightweight composite solid roof at approximately 0.5 kN/m, which it describes as less than 10 per cent over a typical translucent roof. It puts the typical loading of the existing glazed roof at under 10 kN/m. On foundations it is direct: in most cases a 150mm thick concrete strip foundation, or a reinforced concrete slab bearing onto original ground, will be adequate, and trial holes may be waived where the load increase is typically less than 15 per cent. The addendum applies to structures under 30 m², at ground floor, thermally separated with external-quality doors.
So the ground is usually fine and the roof is usually light enough. The risk sits in between, in the vertical frames. A conservatory built for a polycarbonate roof may have mullions reinforced only for that lighter load, and there is no way to know from the outside. LABC says to verify steel reinforcement in the mullions by drilling pilot holes or using a magnet test, and that where there is none, new window frames may be needed to support the roof, or reinforcement installed abutting the existing frames.
If that survey comes back badly, the fix runs £800 to £4,000, which we grade Reasonably evidenced and conflicted. Two publishers disagree by 3.75× on the floor: one publisher (May 2026) puts it at £800 to £2,500, which reads as reinforcing the existing frames, and a second (2026) at £3,000 to £4,000, which reads as replacing them. Both are real outcomes of the same survey. We attach no probability to either, because nobody publishes one. Checked 20 August 2026. The method, and what to ask an installer to do before quoting, is the steel inside your mullions.
What a light roof does not get you out of
Weight is a structural question and it is not the regulatory one. Putting a solid roof on a conservatory stops the structure being an exempt conservatory, which makes the work notifiable regardless of what it weighs. That is true of the lightest system on this page.
What a lightweight system costs
Our register has no row for a lightweight roof, because no publisher prices the category. What it has is rows for the named systems that make the claim, and one of those rows contradicts the manufacturer's own arithmetic by about two times. We publish both ends.
| Line | Figure | Basis | Evidence |
|---|---|---|---|
| SupaLite roof on a 4m × 4m, installed | £8,000 to £12,000 | Third-party quote guide, roughly 17 m² | Reasonably |
| SupaLite supply only, per m² | £1,200 | Manufacturer list, £1,000 plus VAT, grossed | Thin |
| SupaLite supply only, 10 m² roof | £12,000 | Manufacturer list, £10,000 plus VAT, grossed | Thin |
| SupaLite supply only, roof plus new window frames, per m² | £1,800 | Manufacturer list, £1,500 plus VAT, grossed | Thin |
| Structural reinforcement, if the survey finds no steel | £800 to £4,000 | Conditional. Never folded into a headline total | Conflicted |
Installed row: a UK cost publisher, July 2026, two sources, conflicted. Supply-only rows: SupaLite's own published list price, undated, one source, and the inc VAT figures are derived by adding VAT at 20 per cent to the manufacturer's stated ex VAT price, with both shown. Reinforcement row: two UK cost publishers, May 2026 and 2026. All checked 20 August 2026.
The conflict is worth stating plainly rather than averaging away. The manufacturer's own list price of £1,200 per square metre inc VAT implies roughly £20,400 for a 17 m² roof, supply only. A third-party guide prices the same 4m by 4m installed job at £8,000 to £12,000. That is about 2× apart on a job where the second figure includes fitting and the first does not. Our reading, stated as a reading and not as a fact, is a manufacturer list price against installer-network reality. We publish both and average neither.
One itemised real quote exists in our register and it is worth more than any band: a 4m by 4m Victorian SupaLite job at £12,780 including VAT, broken down as roof £8,500, scaffolding £500, six LED downlights £450 and one roof window £1,200 (a UK cost publisher, July 2026, one source, itemised, checked 20 August 2026). An itemised quote is the rarest object in this market. When you get yours, that is the shape it should be in. You can ask for quotes from local roof installers against your own size, or have local installers price it with the weight and reinforcement questions already put to them.
Price your roof in six questions
No phone number until the final step, and no email needed to see an estimate.
What would yours cost?
Six questions, about sixty seconds.
The other options in this family
Once the weight question is answered, what is left is a choice of finish, and each finish is priced at the page that owns it.
The finish most of these systems wear
Composite or polypropylene tiles on an insulated deck. Priced by size, by system and by tile type, with the publisher disagreements shown.
£8,000 to £14,4004m × 4m, installed inc VAT, Well evidenced
tiled conservatory roofsThe finish that tests the claim
Real slate and clay are the point at which lightweight stops being available, and the uplift is charged twice: material, then reinforcement.
£600 to £1,200/m²Installed, one publisher, Thin evidence
Both figures checked 20 August 2026, with their sources named in full on each linked page.
If the frame will not take it
Where the survey comes back badly enough that reinforcing the frames stops making sense, the honest answer is to price replacing the frames and the roof together. That is a different job with a different budget, and the whole of it is priced at conservatory roofs. If you would rather see a number against your own size and roof condition before anyone visits, the Conservatory Cost Calculator asks six questions and shows the register rows behind whatever it returns.
Questions people ask first
How much does a lightweight conservatory roof weigh?
Will my conservatory frame take a lightweight roof?
Are lightweight roof tiles for a conservatory real tiles?
Does a lightweight roof avoid building regulations?
Is a lighter roof less insulated?
What should I ask an installer about weight?
Every figure on this page was last checked 20 August 2026, next check due 20 November 2026. Structural facts come from the LABC addendum on solid roofs to conservatories, May 2018. System weights, U-values and certificate numbers come from manufacturer technical literature and the certification bodies named beside each one. Rows graded Thin come from a single publisher.
Find out what yours costs
Six questions, about sixty seconds, and an estimate built from published UK figures with every source shown. Then up to four local installers can quote you, if you want them to.