What a Tiled Roof Costs on an Existing Conservatory
Four UK publishers price a 4m by 4m tiled roof and they land inside 1.20× of each other at both ends, against a wider market whose stated figures for the same job span 2.8×. Here is that band, the rate per square metre behind it, and the three lines that sit outside it. What sits under the tiles is on what conservatory roofs are made of.
Tiled roof · existing 4m × 4m conservatory · installed, inc VAT
£8,000 to £14,400 typically £10,700
Well evidenced4 sources · 1.20× at both ends · typical is the median of four sourced point estimates · checked 20 August 2026
How much does conservatory roof replacement with tiles cost?
A tiled roof on an existing 4m by 4m conservatory costs £8,000 to £14,400 installed including VAT, typically £10,700. We grade that Well evidenced: four independent UK publishers price this size, and their floors and ceilings both sit inside 1.20×. The typical is the median of their four point estimates, not the midpoint of the band, because the distribution is right skewed and a midpoint would be an invention. Checked 20 August 2026.
A sanity check from outside the cost-guide market: Ultraframe brackets the whole tiled market at £6,000 to £20,000 in its own guidance of 1 May 2024 (one manufacturer, first-party, Reasonably evidenced, checked 20 August 2026), and our size bands sit inside that. You can see what a new roof would cost you against your own size band, or read on for the rows the estimate is built from.
Cost by size
Prices are for the roof only on an existing conservatory, installed and including VAT. Two rows are Well evidenced and carry a typical; the rest are single publisher and graded Thin, which is a statement about the evidence rather than about the price. It is priced as part of a full conservatory roof replacement rather than as a product with a list price.
| Size | Low | Typical | High | Evidence |
|---|---|---|---|---|
| 3m × 3m (9 m²) | £6,000 | £8,075 | £11,000 | Well |
| 3m × 3.5m (10.5 m²) | £6,300 | £7,875 | £9,450 | Thin |
| 3.5m × 3.5m (12.25 m²) | £7,350 | £9,188 | £11,025 | Thin |
| 4m × 3m (12 m²) | £7,500 | not published | £10,500 | Thin |
| 5m × 3m (15 m²), P-shape or T-shape | £8,950 | not published | £9,400 | Thin, undated |
| 4m × 4m (16 m²) | £8,000 | £10,700 | £14,400 | Well |
| 4.5m × 4.5m (20.25 m²) | £11,880 | £15,188 | £18,225 | Thin |
| 6m × 4m (24 m²), P-shape | £11,000 | not published | £15,000 | Thin |
| 5m × 5m (25 m²) | £10,700 | no defensible typical | £20,000 | Conflicted |
Sources: four UK cost publishers, one with a dedicated tiled page dated 2026, one July 2026, one whose size table was last updated December 2024 on a page dated March 2026, and one undated. Checked 20 August 2026. The 5m by 3m row is one publisher, undated, and carries both caveats.
The gap at 5m by 5m, and why we publish no typical
Only two publishers price a 25 m² tiled roof and their bands do not overlap. The higher publisher starts at £12,000; the lower one's highest figure is £11,200. There is no pound they both agree on, so a midpoint would be a number nobody published. We show the outer band, £10,700 to £20,000, and say plainly that the market thins out above 20 m². The same non-overlap appears on glass roofs at the same size, which suggests genuinely thin data rather than one publisher being wrong. Three installer quotes at 25 m² would close it.
Cost per square metre, and why it falls as the roof gets bigger
This is the structural finding most flat-rate calculators miss. The installed rate per square metre declines by roughly 35 per cent from the smallest band to the largest, because scaffolding, mobilisation, disposal and the building control fee do not scale with area. A flat rate per square metre therefore over-quotes a small job and under-quotes a large one, every time.
| Size band | Low £/m² | High £/m² | Evidence |
|---|---|---|---|
| 9 to 10 m² | £680 | £850 | Thin |
| 12 to 14 m² | £625 | £750 | Thin |
| 16 to 18 m² | £500 | £670 | Thin |
| 24 to 28 m² | £460 | £535 | Thin |
| All sizes, reconciled | £460 | £900 | Reasonably |
Band rows: one publisher, July 2026, graded Thin. Reconciled row: three usable publishers, dated March 2026, 2026 and July 2026, spanning 1.96×, with a derived typical of about £650 taken as the midpoint of the reconciled band and labelled derived. Two further published figures are excluded from the reconciled row with the reason stated: one is an on-page estimator widget that contradicts its own article by 3.8×, and one prices tile material only under a roof label. Checked 20 August 2026.
Because of that decline, we band by size and never multiply a rate by your square metres. It is also why the price you are quoted per square metre is only comparable against a quote for a similar-sized roof.
Cost by tile type: composite, concrete or real slate
Most systems fit composite or polypropylene tiles, because weight is the binding constraint on a frame that was designed for glazing. Concrete and real slate are available and both cost more, twice over: the material itself, and the reinforcement the extra weight can force.
| Tile | Installed, per m² | Uplift over composite | Evidence |
|---|---|---|---|
| Composite or polypropylene | £480 to £890 | baseline | Thin |
| Concrete tile | not published | £500 to £1,200 | Thin |
| Real slate or clay | £600 to £1,200 | £1,500 to £3,500 | Thin |
All four rows come from two UK cost publishers, one publisher each, so all are graded Thin. The uplift figures are whole-job uplifts, not per square metre. Checked 20 August 2026.
Nothing in our register gives a kilogram per square metre figure for real slate on a conservatory frame, so we will not print one. If a real slate finish is what you want, the weight argument and the two rows above are set out on slate roof on a conservatory.
Does the system name change the price?
Less than the marketing suggests, and the evidence is thinner than for size. No manufacturer here publishes a fitted price: the price pages at the three largest brands are 404 or parked, so every figure in circulation is a third party pricing somebody else's system.
The one place we can show the arithmetic is SupaLite. Its own list price is £1,000 plus VAT per square metre, which grosses to £1,200 per square metre and implies roughly £20,400 for a 17 m² roof. A third party prices the same 4m by 4m SupaLite job at £8,000 to £12,000 (one UK cost publisher, July 2026, Reasonably evidenced, checked 20 August 2026). That is about 2× apart. We publish both and average neither. Our reading, stated as a reading rather than a fact, is a manufacturer list price against installer-network reality. The system detail sits on the SupaLite tiled roof system.
The £6,000 line
Ultraframe's own guidance (1 May 2024) says a tiled quote below £6,000 is probably a cladover, meaning new tiles laid over the existing roof structure rather than a true insulated replacement. That comes from the manufacturer, not from us, and it is a warning threshold rather than a price. If a quote is under it, ask for the build-up, the insulation thickness and the calculated U-value in writing.
What is included, and what is not
This is the itemisation almost nobody publishes, and it is where two quotes that look the same stop being comparable.
Inside the size bands above
- Removal and disposal of the existing roof
- The new insulated roof system
- Structural fixings
- Plastered or boarded internal finish
- Guttering, where it is replaced
- VAT at 20 per cent
Outside them, and priced separately
- Scaffolding, £400 to £800
- Building control fee, £200 to £800
- Structural reinforcement, £800 to £4,000 and conditional
- Roof window or lantern, £450 to £1,200 each
- Electrics, spotlights and a socket, £500 to £800
- Upgrade from composite to concrete, slate or clay
Three disclosures on the excluded column. The scaffolding row's publisher attribution is ambiguous in our source research and is being re-fetched before we restate it, so treat it as indicative. The electrics row comes from Google's own AI Overview synthesis rather than from a named publisher, and Google does not attribute it, so we cannot check it; it is capped at Thin for that reason. The roof window band spans 2.7× because one publisher contradicts itself between its price guide and its own worked example, and we publish both ends. Building control is £200 to £800 across two publishers, 2.0× apart on the floor. All checked 20 August 2026.
Can you put a tiled roof on an existing conservatory?
Usually yes, and the deciding factor is not the one most pages worry about. LABC puts the added load from 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, and says that in most cases a 150mm concrete strip foundation or a reinforced slab bearing onto original ground is adequate. The two systems in the UK market that publish a weight sit at 31 to 38 kg/m².
The real risk is whether the existing mullions contain steel reinforcement. Frames built for a polycarbonate roof may have been reinforced only for that lighter load, and the only ways to find out are a magnet test or a pilot hole. If the steel is not there, the fix runs £800 to £4,000, Reasonably evidenced but conflicted: 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 it because nobody publishes one. Checked 20 August 2026. The survey method and what to ask for is set out at conservatory frame load capacity.
A tiled roof also stops the structure being an exempt conservatory, which makes the job notifiable building work. No competent person scheme can sign it off, whatever an installer says, which is set out at who actually signs it off.
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The other options in this family
Four words describe overlapping things and only one of them is a finish. These pages hold them apart.
The generic category
Solid says the roof is opaque and nothing else. Priced on the same rows as tiled, because the register prices them together.
£6,000 to £11,0003m × 3m, inc VAT, Well evidenced
a solid roof for your conservatoryThe weight claim
Not a material. A claim a manufacturer makes about a system, and only two systems publish a figure to back it.
31 to 38 kg/m²Published system weights, Reasonably evidenced
lightweight conservatory roofThe heavy finish
Real slate and clay, the uplift over composite, and the weight question that usually decides it.
£600 to £1,200/m²Installed, one publisher, Thin evidence
All figures checked 20 August 2026. Sources are named in full on each linked page and in conservatory cost.
Planning permission for a tiled roof
Usually not required, and the class it falls under is widely reported wrong. Replacing a conservatory roof is governed by the General Permitted Development Order 2015, Schedule 2, Part 1, Class C, which covers any other alteration to the roof of a dwellinghouse. It is not Class A, because Class A expressly excludes roof alterations at A.1(k)(iv). Under Class C the new roof must not protrude more than 0.15m beyond the plane of the original roof slope and must not exceed the highest part of the original roof.
Rights are removed on Article 2(3) land, on listed buildings and where an Article 4 direction applies. One genuine grey area we cannot settle from a published source: where a solid roof increases the height, councils differ on whether to treat it under Class C or Class A. If yours does, ask the local planning authority in writing before you sign. Planning permission is a separate question from building control, which a tiled roof almost always triggers.
Questions people ask first
Are tiled conservatory roofs worth it?
Do I need planning permission to put a tiled roof on my conservatory?
Can I get a grant to replace my conservatory roof?
Can you put a tiled roof on an existing conservatory?
How much to replace a conservatory roof with tiles at 3m by 3m?
Why is my quote per square metre so different from my neighbour's?
What is a cladover, and how do I spot one?
Every figure on this page was last checked 20 August 2026, next check due 20 November 2026. Rows graded Thin come from a single publisher; rows marked conflicted have two publishers who disagree, and we publish both ends rather than averaging them.
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