The Cases Where a Conservatory Adds Value
Sometimes it does. It turns on whether the room works in January, what it did to the garden, and what a buyer thinks it will cost them to put right. We publish no percentage uplift, because no source we hold has one.
A new conservatory · any style, any size · UK, installed inc VAT
£9,000 to £25,000 typically £15,000
Well evidencedFive publishers, four of them putting the floor at £9,000 to £10,000. Checked 20 August 2026.
Does a conservatory add value to a house?
Sometimes. It adds value when it adds floor area a buyer can use all year, in a house that was short of it, on a plot that could spare the garden. It is neutral when it duplicates space the house already has. It reduces value when it is unusable, visibly failing, or reads as a job the buyer will have to pay for.
If you want the build cost before the argument, work out what your conservatory will cost, then come back and test the three cases against your own figure.
Nobody has the valuation data, including us
The percentages that circulate in this category are unsourced. We went looking for the dataset behind them and there is none in any source we hold: no paired study of comparable sales, no surveyors' body publishing a figure with a method, no index. What exists is a number repeated between websites until it acquires the look of a fact.
So there is no percentage on this page, and there will not be one until somebody publishes the working. This is the easiest page in the category to fill with a plausible figure, which is exactly why it is the one to get right. What would close the gap: sale prices for otherwise comparable houses with and without a conservatory, or a named valuation body publishing an uplift with its method and a date on it.
A second reason survives even if that data turns up. Value is set by one buyer, on one day, for one house, and a national figure tells you nothing about the person standing in your conservatory in February. The three cases below are argued from evidence we do have: build cost, condition and specification.
The three cases
It adds value
- It adds a room the house did not have. A three-bedroom house with one reception room gains something real. On a house that already has a dining room and a study it is a fourth version of a thing.
- It is usable in January and in July. The condition everything else hangs off. A room habitable in two seasons out of four gets counted as outdoor space with a lid on it, and nobody pays per square metre for that.
- It suits the house and left the garden intact. On a small plot outside space is the scarcer commodity, so the conservatory is a trade rather than an addition, and which way it goes depends on who is buying.
It is neutral
Neutral is the commonest outcome and the least written about, because it makes a dull headline. A sound, ordinary conservatory on a house that already had enough downstairs space does not move the price: the buyer likes it, mentions it, and pays for the house. Which is an argument for buying it as a room you will use rather than as an investment. On that basis it is the cheapest of the three ways to get one, and what a conservatory costs against an extension settles the comparison properly.
It reduces value
This is the half nobody else publishes. A buyer does not value a failing conservatory at zero. They value it as a liability, and the deduction is whatever they think putting it right will cost, estimated generously in their own favour.
- It is visibly unusable. Polycarbonate gone green, blinds closed since last summer, a fan heater in the corner. Each is read at a viewing in about four seconds.
- It leaks, or has, or the units have misted. A buyer cannot tell from looking whether staining is a seal or the structure, and uncertainty gets priced high. Misted panes are the one defect they can count from the garden.
- It darkened the room behind it. The most under-discussed negative in this category. A conservatory off a kitchen turns that kitchen's outside wall into an internal one, and a dark kitchen costs more at valuation than a bright conservatory adds.
- It has to come off. A structure at the end of its life, on a house whose next owner wants the space back, becomes a demolition line in their offer. We publish no figure for removing a whole conservatory, because our register holds none.
- The paperwork is missing. Where a conservatory has been knocked through, heated off the house system or had its roof replaced, a solicitor may ask for consents nobody obtained. That is a delay or an indemnity rather than a valuation, and it lands at the worst moment in a sale.
What it costs to build, against the alternatives
Three jobs, three sourced ranges, installed and including VAT.
| Job | Low | High | Evidence | Sources |
|---|---|---|---|---|
| A new conservatory, any style, any size | £9,000 | £25,000 | Well evidenced | Five UK cost publishers, dated June 2026, May 2024, January 2025, July 2025 and June 2026 |
| An orangery, 16 m² | £30,000 | £35,000 | Reasonably evidenced | A national orangery guide, March 2026 |
| A small single-storey extension | £40,000 | £56,000 | Thin | One national cost publisher, October 2024 |
| Value added, as a percentage of any of the above | no figure | no figure | Gap | No valuation dataset exists in any source we hold |
Sources as counted per row, checked 20 August 2026. Our register grades the orangery row Reasonably evidenced on three sources, anchored on a national orangery guide. One reconciliation worth showing: that same publisher's own October 2024 side-by-side puts the conservatory line at £9,000 to £18,000, narrower than the band above because it is one publisher. Ours reconciles five, so it runs wider at the top, and we publish the wider version rather than the flattering one. The per-square-metre cross-check is on the per square metre table.
That gap cuts both ways. A conservatory is by some distance the cheapest of the three, which is why whether it pays back is worth asking at all. It is also the only one a buyer might treat as a liability rather than as floor area, which no extension ever is. If it is the difference between the two other names you are unsure about, that is settled at its owner: the difference between a conservatory and an orangery.
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The roof is what moves a conservatory between the cases
Read the three cases back and one thing decides which one you are in. Usable in January, not visibly failing, not darkening the room behind it, not a job priced into somebody's offer: all four are the roof. Frames and bases are usually the parts that last. The roof is the part that fails, and it is what a viewer looks at first, because it is the only bit of the structure at eye level from the garden.
It is also the cheapest part to change. To move a conservatory out of the neutral case the intervention is how much a solid conservatory roof costs rather than a rebuild, at a fraction of the figures above. Where the structure is tired rather than failed, what a refurbishment costs is the smaller version of the same move. Where the roof has actually failed, that is the job to price before anything else: conservatory roof replacement cost. For the build side, what a conservatory costs holds the register, or get quotes for your roof and find out what yours would take.
Questions people ask first
Does a conservatory add value to a house?
How much value does a conservatory add?
Can a conservatory make a house harder to sell?
Is a conservatory worth it?
Does replacing the roof change the answer?
Sources for this page
All retrieved and checked 20 August 2026.
The full list, with what each source is trusted for, is on the sources behind every figure. Checked 20 August 2026, next check due 20 November 2026.
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