Conservatory Upgrade Options, Cheapest First
Almost every page about fixing a conservatory is selling one fix. This one lists all of them in price order, from a £150 radiator to a £20,000 rebuild, with the evidence grade on each and a link to the page that holds the full working. Nothing here is priced by us; every figure belongs to a published source and is dated. If you are not sure what you have on top, start with types of conservatory roof covering.
Cheapest fix that changes the room · roof insulation, 3m × 3m, fitted
£1,050 to £2,750 by ceiling finish
Thin evidence1 publisher, 2 July 2026 · aluminium panel at the floor, plastered ceiling at the top · checked 20 August 2026
How much does a conservatory upgrade cost?
Between £150 for a radiator and £20,000 for a full refurbishment, and the honest answer is that the spread is not a price range but a list of different jobs. The cheapest fix that measurably changes a conservatory roof is insulation at £1,050 to £2,750 fitted for a 3m by 3m, Thin evidence from one publisher dated 2 July 2026. The fix that changes it permanently is a new solid roof at £6,000 to £11,000 at the same size, typically £8,075, Well evidenced across four publishers. Checked 20 August 2026.
Before spending anything, name the complaint. Too hot in July is a solar problem and is solved by shading and glass. Too cold in January is a heat-loss problem and is solved by insulation or a new roof. Too noisy in the rain is a polycarbonate problem. Unusable as a room is a regulatory problem, not a comfort one. Buying the wrong rung of this ladder is the commonest way to spend four figures and still not use the room. If you want a figure against your own conservatory, you can use the Conservatory Cost Calculator first and come back to the list.
The upgrades, cheapest first
Ordered by published floor price. Every row carries its own evidence grade, and no row is our own estimate. The page that owns each figure carries the full source list and the disagreements behind it.
| Upgrade | Published range | What it actually changes | Evidence |
|---|---|---|---|
| Panel radiator, supply and fit, each | £150 to £300 | Takes the edge off in winter. Does nothing about heat loss | Thin |
| Radiator extended from the house heating | £300 to £800 | Warm on demand, and it can end the building regs exemption | Thin |
| Electric underfloor heating, installed | £500 to £1,200 | Comfortable floor. Running cost is the catch through an uninsulated roof | Thin |
| DIY multifoil roof kit, by size | £1,000 to £3,000 | Cuts glare and radiant heat. Not a regulated thermal element | Thin |
| Roof insulation fitted, 3m × 3m | £1,050 to £2,750 | The cheapest fix that changes the roof. Finish sets the price | Thin |
| Manual roof blinds, fitted | £1,200 to £5,000 | A summer fix. Electric versions £2,500 to £8,000, one publisher, Thin | Reasonably |
| New glass roof, up to 3m × 3m | £2,000 to £7,000 | Keeps the light, ends the noise, typically £4,000 | Reasonably |
| Full refurbishment package | £5,000 to £20,000 | Frames, glazing, roof and floor together on a tired structure | Thin |
| Solid or tiled roof, 3m × 3m | £6,000 to £11,000 | Year-round room, typically £8,075. Costs you daylight | Well |
| Convert to a habitable room | no single published figure | Roof, walls, floor, heating and sign-off as one project | Gap |
Heating rows: two UK cost publishers, April 2026 and January 2025. Multifoil kit: one UK publisher, 11 December 2024, the only multifoil-by-size table published in the UK. Insulation: one publisher, 2 July 2026. Blinds: a UK trades marketplace, 19 June 2026, for manual, one publisher for electric. Glass: four publishers, 2025 and 2026. Refurbishment: the same marketplace, 25 December 2025. Solid or tiled: four publishers, 2024 to 2026. All checked 20 August 2026.
One exclusion worth naming on the blinds row. A third published band for manual roof blinds sits three to four times above the figures we use, and it comes from a company whose business is selling conservatory insulation rather than blinds. We exclude it and say why rather than averaging it in. A second set of blinds figures from a large marketplace was last updated in May 2024 and is the stalest major figure in our research, so it is excluded on age.
Make it warmer, for under £1,000
The bottom of the ladder is heating rather than fabric, and it works in a specific and limited way: it makes the room usable while the heating is on, and it does not change how fast the heat leaves.
A single or double panel radiator supplied and fitted is £150 to £300 each, extending the existing central heating into the conservatory is £300 to £800, and electric underfloor heating installed is £500 to £1,200. All three are Thin evidence, one publisher each, checked 20 August 2026. Running cost is the line nobody quotes: through a polycarbonate roof at 1.78 to 3.2 W/m²K, most of what you pay for goes straight out of the roof.
The radiator that quietly ends your exemption
An exempt conservatory has to stay thermally separated from the house, with external-quality doors between the two, and the dwelling's heating system must not be extended into it without that extension being assessed. Installers do this routinely and it is the commonest way an exempt conservatory stops being exempt. It matters when you sell, because a solicitor will ask for paperwork that was never created. If the room needs heating, it is worth reading that alongside the fabric options at making a conservatory warmer.
Insulate it instead, for £1,050 to £2,750
This is the rung most people should look at hardest, and it is also the one with the most misleading marketing around it.
Fitted roof insulation on a 3m by 3m conservatory runs £1,050 to £2,750, and the entire spread is the ceiling finish: an aluminium panel ceiling is £1,050 to £1,200, a uPVC ceiling £1,200 to £1,450, and a plastered ceiling £2,200 to £2,750. Per square metre fitted, that is £85 to £160 for aluminium panel, £95 to £180 for uPVC and £145 to £275 for plastered. One publisher, 2 July 2026, Thin evidence, checked 20 August 2026. The UK average quoted for conservatory roof insulation is £2,850, also one publisher.
Why the fitted price is ten times the material price is worth stating, because it is the question that makes this whole category confusing. The board itself is £15 to £40 per square metre for PIR or XPS, and multifoil is £10 to £20. Labour is 65 to 75 per cent of an insulation job. That single ratio is the difference between a DIY kit at £1,000 to £3,000 and a fitted plastered ceiling at £145 to £275 per square metre, and it is why the two halves of this market never quote the same number.
Two limits we will not soften. Internal roof insulation does not make the roof compliant with the 0.15 W/m²K limiting value, and it does not turn the conservatory into a habitable room. And no publisher we found prices insulation at 3m by 4m at all: the tables jump from 3m by 3m straight to 4m by 4m, so any 12 m² figure you are shown, including ours, is interpolated and should say so. The full set of sizes, finishes and sources is at insulating a conservatory.
Replace the roof, for £2,000 to £11,000
Two very different jobs sit in this band, and which one you want depends entirely on whether you would trade daylight for a room you can use in February.
A new glass roof up to 3m by 3m is £2,000 to £7,000 installed including VAT, typically £4,000, Reasonably evidenced across four publishers. It keeps the light, ends the rain noise, reaches 1.0 to 1.3 W/m²K on a decent sealed unit, and generally does not make the work notifiable.
A solid or tiled roof at the same size is £6,000 to £11,000, typically £8,075, Well evidenced across four publishers whose floors agree within 1.05 times, which is the tightest agreement anywhere in our price register. It reaches 0.15 W/m²K, it is the only option that makes a conservatory usable year round, and it costs you daylight, a building control fee of £200 to £800, and possibly £800 to £4,000 of frame reinforcement. All checked 20 August 2026.
The full size table, the per square metre reconciliation and the itemisation of what is and is not in a roof quote sit at putting a new roof on a conservatory, and the argument for and against the opaque option, including what you lose in light, is at a solid conservatory roof. If you already know which you want, find conservatory roofers near you.
Turn it into a room
The top of the ladder is not an upgrade, it is a change of category. Removing the thermal separation and treating the conservatory as part of the house pulls in the roof, the walls, the floor, the glazing, the heating and a full building control process, and our register holds no single published figure for the whole job. We are not going to invent one. What we can say is that the roof line alone is £6,000 to £11,000 at 3m by 3m, and that every other element is priced separately in our register. What the process involves, and what has to change for the room to count as habitable, is at convert conservatory to room. Three itemised quotes for a full conversion at a stated size would close the gap on our side.
When you are ready to put real numbers against your own conservatory, get roof replacement quotes rather than working from any national band, including ours.
Price your job in six questions
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What would yours cost?
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Or refurbish what is there
If the frames have dropped, the seals have gone and the floor is cold as well as the roof, fixing one element at a time is the expensive route. A whole-structure package runs £5,000 to £20,000, typically around £10,000, from one publisher dated 25 December 2025, so Thin evidence, checked 20 August 2026. That is priced, itemised and sourced at conservatory refurbishment cost.
What needs signing off
Blinds, heaters and internal insulation are not notifiable building work. A solid roof is, and so, potentially, is extending the central heating into the room. The work goes to Local Authority Building Control or a Registered Building Control Approver, and no competent person scheme covers it, whatever an installer says. The test, the fee and the paperwork you should end up holding are at which body signs it off.
And if the conservatory itself is the thing you are reconsidering rather than the roof, the whole-structure figures, from a new build to an orangery, sit at what a conservatory costs.
Questions people ask first
What is the cheapest way to make a conservatory usable?
Is conservatory roof insulation worth it compared with a new roof?
Will upgrading my conservatory need building regulations approval?
How much are conservatory roof blinds?
Can I get a grant towards upgrading a conservatory?
Why can nobody tell me the price for a 3m by 4m conservatory?
Every figure on this page was last checked 20 August 2026, next check due 20 November 2026. Each range belongs to the page linked beside it, where the full source list, the spread and the reconciliation are published. Rows graded Thin come from a single publisher. Excluded figures are named above with the reason.
Find out what yours costs
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