Pricing a Solid Roof on an Existing Conservatory
The most complete answer to a conservatory that is too cold in January, and it takes out the glazing the July sun comes through, though nobody has published a measured summer temperature for one. It also costs you light, adds weight your frames may or may not carry, and turns the job into regulated building work.
Solid or tiled roof · existing 3m × 3m conservatory · inc VAT
£6,000 to £11,000 typically £8,075
Well evidencedMedian of five sourced point estimates. At 4m × 4m: £8,000 to £14,400.
Price your job in six questions
No phone number until the final step, and no email needed to see an estimate.
How much does a solid conservatory roof cost?
Note the implied rate falling as the roof grows. Fixed costs do not scale with area, which is why we band by size rather than multiplying a rate by your square metres.
| Size | Low | Typical | High | Implied £/m² | Evidence |
|---|---|---|---|---|---|
| 3m × 3m (9 m²) | £6,000 | £8,075 | £11,000 | £680 to £850 | Well |
| 3m × 3.5m (10.5 m²) | £6,300 | £7,875 | £9,450 | £680 to £850 | Thin |
| 4m × 3m (12 m²) | £7,500 | not published | £10,500 | £625 to £750 | Thin |
| 4m × 4m (16 m²) | £8,000 | £10,700 | £14,400 | £500 to £670 | Well |
| 4.5m × 4.5m (20.25 m²) | £11,880 | £15,188 | £18,225 | £500 to £670 | Thin |
Sources: four independent UK publishers, one dated 2026, one July 2026, one a December 2024 table and one undated. Checked 20 August 2026.
What a solid roof adds, and what it saves
The saving is a comfort saving before it is a money saving. A conservatory with a polycarbonate roof loses heat through the roof faster than any other surface in your house. A solid roof built to current standards reaches 0.15 W/m²K, which is better than the wall it joins.
What you lose is light, and that loss is the single most common regret. Where the aim is converting a conservatory into a usable room, the roof is one part of a longer job.
| Property | Figure | Why it matters |
|---|---|---|
| U-value, insulated solid roof | 0.15 W/m²K | The standard the roof must reach. Not one of the thirteen competing pages we surveyed publishes any W/m²K figure at all |
| Weight, lightweight tile system | 31 to 38 kg/m² | What your existing frames have to carry |
| Added load over a translucent roof | about 0.5 kN/m | LABC's own figure. Under ten per cent more than a typical translucent roof |
| Cladover warning threshold | under £6,000 | Ultraframe's own guidance: a tiled quote below this is probably a cladover, not a true solid roof |
| Roof window, fitted with the new roof | £450 to £750 each | Thin, one publisher, VAT not stated. The same publisher's itemised quote has one at £1,200 before VAT, £1,440 with it. Band checked 14 September 2026 |
| Roof window, added to a finished roof later | £750 to £1,200 each | Thin, the same publisher, VAT not stated. Fitting one later costs more than fitting it with the roof. Checked 14 September 2026 |
The other options in this family
Solid, tiled and warm are three words for overlapping things. These pages separate them.
Replacing polycarbonate
The commonest starting point, and the biggest single jump in comfort.
£6,000 to £11,0003m × 3m, inc VAT
Roof replacement costs →
Insulating instead
A fraction of a replacement. Solves the winter half of the problem. Nobody has measured what it does in summer.
£1,200 to £2,900Building Regs upgrade to a heated envelope
Conservatory insulation cost →
Who signs it off
LABC or a Registered Building Control Approver. No competent person scheme covers it.
£200 to £800Building control fee, 2 publishers, 2× apart
who signs the work off →
Get quotes on a solid roof
No online calculator can tell you whether your existing frames are steel reinforced. LABC says that, not the foundations, is the real structural risk. That is what the free survey is for, and it is the commonest reason a tiled roof quote changes.
Questions people ask first
Do I need building regulations approval for a solid conservatory roof?
Will my existing conservatory take a solid roof?
How dark will the room be?
Last checked 20 August 2026.
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.