Does a Conservatory Add Value to a House in the UK?
Conservatories are the weakest performer among popular UK home improvements. A good one adds 0–5%; a bad one — too hot in July, unusable in January, dated white uPVC — is a liability that buyers mentally price as a demolition job. The market has moved decisively towards solid-roof orangeries.
Conservatories and house value — 2026 UK at a glance
- Typical uplift: 0–5% — the weakest of the common improvements.
- Can be negative: a dated, leaking or thermally hopeless conservatory reduces value.
- Cost: £8,000–£25,000 for a conservatory; £20,000–£45,000 for an orangery.
- Better option: a solid-roof orangery or single-storey extension reads as habitable space and adds 5–10%.
- Not counted: conservatories are usually excluded from habitable floor area and often exempt from building regulations.
Bottom line: if you want the value, build an orangery or a proper extension. If you want a bright garden room on a budget and don't mind the resale being neutral, a conservatory is fine — just don't expect it to pay.
Conservatory vs orangery vs extension in 2026
Conservatories are typically excluded from a property's habitable floor area, which is the core reason they underperform. An orangery or extension built to building regulations is counted.
Making a conservatory work harder
- Replace the polycarbonate roof: a solid or insulated tiled roof conversion (£5,000–£12,000) transforms usability and is the single best upgrade.
- Solve the temperature problem: thermally efficient glazing, blinds and a proper heat source are what turn a three-month room into a twelve-month one.
- Match the house: white uPVC bolted onto a period property is a common value-destroyer. Match materials and proportions.
- Keep it proportionate: a conservatory that swallows most of a small garden costs more in lost outdoor space than it adds in floor area.
- Remove a dead one: if it leaks, is rotting or is unusable, demolishing it before sale often nets more than leaving it.
Tip: if you already have a conservatory that nobody uses, a solid-roof conversion is usually the highest-return spend available — it converts a seasonal liability into a year-round room for a fraction of an extension.
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Frequently asked questions
Typically 0-5%, which makes it the weakest performer among popular home improvements. A dated, leaking or thermally hopeless conservatory can reduce value, because buyers price in the cost of removing it.
Because conservatories are usually excluded from the property's habitable floor area and are often exempt from building regulations. An orangery or extension built to building regulations is counted as living space, which is what drives valuations.
Generally yes. An orangery has a solid insulated roof and more substantial walls, so it reads as genuine habitable space and typically adds 5-8% against a conservatory's 0-5%, despite costing more to build.
If it leaks, is rotting, or is visibly unusable, removing it often nets more than leaving it, because buyers price a dilapidated conservatory as a demolition cost. If it is sound but dated, a solid-roof conversion is usually the better option.
Usually not, as most conservatories fall under permitted development limits on size, height and boundary position. Flats, listed buildings and conservation areas are exceptions, and building regulations may apply if the conservatory is not separated from the house by external-quality doors.
Yes, and it is generally the highest-return conservatory upgrade at GBP 5,000-12,000. Be aware that adding a solid roof usually brings the structure within building regulations control, so the work needs to be approved and signed off.
Sources used in this guide
- Planning Portal - Extensions
- gov.uk - Building Regulations Approved Documents
- RICS - Royal Institution of Chartered Surveyors
Methodology: Value ranges are indicative estimates compiled from published UK house-price indices, surveyor guidance and agent-reported sale data for Q3 2026, expressed as a percentage of typical property value. Actual uplift depends heavily on local market, property type and build quality - always take advice from a local valuer before budgeting on a resale figure. Last fact-checked: .