A new uPVC conservatory in Cardiff or Caerphilly typically costs £9,000 to £13,500 for a 3.5 m by 3.5 m room, depending on style, according to Checkatrade’s June 2026 cost guide. Daimant, a family-run installer based in Caerphilly, gives you a fixed written price after a free survey, so you know your own figure before you compare quotes.
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How much does a conservatory cost in Cardiff?
A uPVC conservatory of about 3.5 m by 3.5 m costs between £9,000 and £13,500 depending on style, according to the Checkatrade conservatory cost guide updated in June 2026, with the lean-to at the lower end and the Victorian at the top. Treat these figures as a guide for Cardiff and Caerphilly, not a quote.
| What the Checkatrade figure covers (June 2026) | Conservatory | Orangery |
|---|---|---|
| Size | 3.5 m x 3.5 m | About 16 m2 |
| Frame | uPVC | Pillars with a solid roof and lantern |
| Typical cost | £9,000 to £13,500 by style | About £32,500 |
The ranges assume a standard uPVC frame on a new base, and the style by style figures are in the table further down. A different size, a solid roof, extra doors or a difficult site moves the figure. Daimant does not publish a price list: you get a fixed written price for your home after a free survey, with no obligation.
- Checkatrade’s June 2026 guide prices a 3.5 m by 3.5 m uPVC conservatory by style.
- Size, style, roof, base and glazing move the price the most.
- Base, electrics, flooring and building control can sit outside a quote.
- Fair quotes price the same specification and list each item on its own line.
- Daimant gives a fixed written price after a free survey.
What drives the price of a conservatory?
The price of a conservatory is driven by six things, its size, its style, the roof, the base, the glazing and the extras such as doors and blinds, and the size and roof together usually account for the biggest share. Each item below adds to or takes from the figure.
- Size: each extra square metre adds base, frames and roof.
- Style: a lean-to has the simplest roof; a Victorian has the most angled frames.
- Roof: polycarbonate costs least, glass sits in the middle and a solid warm roof costs most.
- Base: sloping gardens, drains and poor ground add groundwork.
- Glazing specification: A+ rated double glazing and solar control glass cost more than standard units.
- Extras: bifold or French doors, roof vents, blinds and trims each add to the total.
Conservatory cost by roof type
Conservatory roof type changes the cost more than almost any other choice: polycarbonate is the cheapest roof, a glass roof costs more, and a solid warm roof such as the LEKA system costs the most while keeping the room usable through winter and summer.
| Roof type | Relative cost | What you get |
|---|---|---|
| Polycarbonate | Lowest | Light panels; loses heat quickly and is noisy in rain |
| Glass | Middle | Clear view of the sky; solar control glass reduces glare |
| Solid warm roof (LEKA) | Highest | Insulated, plastered ceiling with a U-value as low as 0.15 W/m2K |
A solid warm roof on a new conservatory adds to the build cost, and a solid roof is normally treated as needing building control involvement. Daimant tells you on the survey whether your job needs sign-off. For swapping the roof on a conservatory you already own, see our guide to roof replacement prices.
Conservatory cost by style
Conservatory cost by style runs from the lean-to at the lower end, through the Edwardian, to the Victorian at the top of the three styles Checkatrade prices, with gable-end and combined shapes priced on survey. The table uses the same 3.5 m by 3.5 m room.
| Style | Typical cost (Checkatrade, June 2026) | Why |
|---|---|---|
| Lean-to | £9,000 to £11,500 | Single sloping roof, fewest frames |
| Edwardian | £10,500 to £12,000 | Square plan, hipped roof |
| Victorian | £12,000 to £13,500 | Faceted bay front and roof |
| Gable-end | Priced on survey | Tall glazed front and apex |
| P-shape and T-shape | Priced on survey | Two styles joined into one room |
Style also affects how you use the room, so pick it for fit first. Our conservatory styles compared guide matches each style to terraces, semis and bungalows.
Which costs can sit outside a conservatory quote?
Costs that can sit outside a conservatory quote include the base, the electrics, the flooring, heating, blinds and any building control fee, and each one can add to the final bill once the frames are up. Ask every installer to mark these items as included or excluded.
- Base: the foundations and floor slab, including any extra depth for poor ground.
- Electrics: sockets and lights need a qualified electrician, who may be priced separately.
- Flooring: the screed, underfloor insulation and finished floor can each be extra.
- Heating: fixed heating brings the room under building regulations.
- Blinds: roof and side blinds are often priced separately.
- Building control fee: charged by the council or an approved inspector where sign-off is needed.
Why a cheap conservatory quote can cost more later
A cheap conservatory quote can cost more later when the saving comes from a shallow base, a roof fitted without building control or missing paperwork, as each of these can lead to cracking, subsidence or a problem when you sell the house. Putting any of them right usually costs more than the original saving.
A weak base
The base carries the whole structure, and a base laid too shallow for the ground can move, and cracked walls, sticking doors and gaps at the house wall follow. Putting it right means taking the conservatory down.
A non-compliant roof
A solid roof put on without building control involvement can leave you without a completion certificate. A buyer’s solicitor asks for that paperwork, and a missing certificate can hold up a sale.
No certificate or guarantee
A quote with no written guarantee leaves you to pay for faults yourself, and Daimant is FENSA registered and gives a 10-year insurance-backed guarantee.
How to compare conservatory quotes fairly
A fair comparison of conservatory quotes checks that each one prices the same specification, lists every item separately and comes with a written guarantee, so you are weighing like against like. These five steps help.
Match the specification
Check each quote uses the same size, style, roof type and glazing.
Ask for an itemised quote
The base, frames, roof, doors, electrics and flooring should each have a line.
Check the base detail
Ask how deep the base goes and who checks the ground.
Check the guarantee
Look for a written guarantee that is insurance backed and states how long it runs.
Ask who fits it
Find out whether the company’s own team fits the conservatory and ask for the timetable in writing.
Finance and deposit protection
Finance and deposit protection are two points to settle before you sign: how you will spread the cost, if you plan to, and what happens to any deposit you pay if the installer stops trading before the job is done. Ask both questions at your survey.
Any finance offer should come with the lender’s name and the full terms in writing. For the deposit, ask whether it is protected and how. Our guide explains how your deposit is protected alongside the Daimant 10-year guarantee.
Which conservatory should you price first?
The conservatory to price first is the one that suits your house and garden: style and size set most of the cost, and a free survey gives you a fixed figure for that design. Start with the style, then compare roofs.
Every price band here assumes a correctly built base and roof. That is why the style you choose matters as much as size. Our page on conservatories in Caerphilly and Cardiff shows each style we build.
Frequently asked questions
Daimant prices each job from its own survey, so the figure depends on your design and site, not the postcode. Checkatrade’s figures are UK guides and give a starting point for both.
Daimant prices every conservatory from a free survey at your home, as the base, walls and access all change the figure. The survey gives you a fixed written quote with no obligation.
A solid warm roof costs more to fit and keeps the room usable in winter and summer. The LEKA roof we fit reaches a U-value as low as 0.15 W/m2K.
Standard rate VAT normally applies to a new conservatory, so check that every quote you compare states whether VAT is included.
Daimant books a free survey at your home and gives you a fixed written quote afterwards. Call 029 2002 3280, Monday to Friday 9:00am to 4:30pm, to arrange a visit.
