Why Our Figures Are Estimates
Every price here is an estimate, assembled from published UK sources, carrying the name of the source and the date we last checked it. It is not a quotation, and the difference decides what you can hold somebody to.
We publish prices so you can walk into a quotation already knowing roughly what the job costs. What we cannot do is price your conservatory, because we have never seen it. The Conservatory Cost Calculator narrows the range using your roof, your size band and your postcode, and how we work out these figures is set out in full. What comes out is research, not an offer.
An estimate and a quotation are not the same thing
The two words do different work, and using them interchangeably is how a homeowner ends up surprised by a final invoice.
| An estimate, like ours | A quotation, from an installer | |
|---|---|---|
| What it is | A considered figure for what work like yours has cost other people | A fixed price for your job, from a named business that has measured it |
| Who is bound by it | Nobody. It is published research | The installer who issued it, on the terms it sets out, once you accept it |
| What it rests on | Published prices for a roof type and a size band, with VAT at 20% included | Your base, your frame, your access and your building control route, after a survey |
| When it moves | When the sources move. Every figure carries its last-checked date | Only if the job changes, and a good quotation says which changes and by how much |
Nothing here is an offer capable of acceptance, and no installer is bound by a figure we publish. Our terms of use say so at greater length.
What the figures are made of
The register behind every page holds 222 price rows. 210 carry a named source and a date, and twelve are published as gaps. Of the 207 rows that carry a figure, only five clear our Well evidenced bar against 32 Reasonably evidenced and 168 on thin evidence. We publish that split rather than presenting 222 numbers as though they were equally solid. Last counted 20 August 2026, next re-check due 20 November 2026, and you can read the sources behind every figure.
Four rules keep a figure honest enough to publish:
- A typical is the median of the sourced point estimates, never the midpoint of a published band.
- Supply only and installed prices are never blended into one figure.
- Totals are given by size band, because the per square metre rate falls as the roof grows and multiplying it by your area over-quotes small jobs.
- VAT is included at 20% and said to be.
What only a survey can settle
What moves a conservatory roof price most is what nobody can see from a website: whether the base and dwarf walls carry the extra load, whether the frame and its mullions need steel reinforcement, how easily a crew can reach the roof, and which building control route applies. An installer answers those by visiting, and that visit is the moment a range becomes a price.
A real quotation names the business, itemises the work, states what is excluded, shows the price with VAT and says how long it stands. A single number with none of that is a sales figure, and you have nothing to hold anyone to.
If a figure here is wrong
Tell us. We correct figures and date the correction rather than editing quietly, so a change can still be traced. You can contact us with the page and the figure. We publish who writes this site and how this site is paid for, because a price publisher that hides either is not worth reading.
When you want real numbers rather than a range, conservatory roof quotes come from installers who will survey the job. The free estimate comes first.