Pottery kiln buying, from a test kiln to a studio kiln
The kiln is the expensive decision, and the mistake people make is treating it as a size question when it is first an electricity question. A kiln that plugs into an ordinary thirteen-amp socket is a different machine from one that needs its own circuit, and the second requires an electrician before it requires a delivery date. Get that answer first and the rest of the choice narrows quickly.
- median printed price per kilogram of clay, ex VAT
- £1.03
- suppliers with a verified printed price
- 3
- materials with measured demand
- 2
Figures on this page come from the PotterySuppliesHQ price index: 3 suppliers, median £1.03 per kilogram of clay ex VAT, each quoted from the supplier's own product page and dated.
- 3 supplier pages verifiedevery figure matched verbatim to the supplier's own product page
- Quoted and dated, never estimatedlast verification pass 2026-09-09
- 2 materials coveredeach with measured search demand behind it
Printed prices, verified
| Supplier | Price per kg | Delivery from | Fires up to | Source | Checked |
|---|---|---|---|---|---|
| Bluematchbox Potters Supplies | £0.96/kg | 1,300 C | bluematchbox.co.uk | September 2026 | |
| CTM Potters Supplies | £1.03/kg | 1,280 C | ctmpotterssupplies.co.uk | September 2026 | |
| Potclays | £1.18/kg | 1,300 C | potclays.co.uk | September 2026 | |
| Bath Potters Supplies | No bag price on the page; the per-kilogram figure shown is the single-kilogram unit (checked September 2026) | £9.59/order | bathpotters.co.uk | September 2026 |
Four questions that decide which kiln you can actually have
- What is the electrical supply where it will stand?. Plug-in kilns run from a standard socket and are limited in size by that. Anything larger needs a dedicated circuit installed by an electrician, and in a rented property that is a conversation with a landlord before it is a purchase.
- How big is the largest thing you will fire?. Chamber dimensions matter more than volume in litres, because a tall narrow piece and a wide platter fail on different measurements. Work out your largest realistic piece, add the shelf and prop height, and compare that against the internal dimensions.
- What temperature do you need?. Earthenware fires around 1100 degrees, stoneware around 1250, porcelain higher again. A kiln rated to a temperature you rarely reach costs more to buy and lasts longer at the temperature you do reach, so a margin is worth having.
- Where will the heat and the fumes go?. A kiln makes a room hot and gives off fumes during firing. It wants a space you can ventilate and keep clear, not a cupboard, and not a room anyone sleeps in.
Plug-in or hard-wired, and why it decides everything else
A thirteen-amp kiln is limited to roughly three kilowatts, which sets a ceiling on chamber size and on how quickly it can climb. That is enough for test tiles, jewellery, small bowls and a slow bisque, and it is genuinely useful. It is not enough for a full shelf of mugs fired in a working day.
Anything beyond that needs its own supply. The cost of that installation is a real part of the kiln price and is invisible on every kiln listing, which is why it belongs at the top of this page rather than the bottom.
The furniture is a consumable, not an accessory
Shelves, props, stilts and kiln wash are bought with the kiln and bought again afterwards. Shelves warp and crack, wash flakes and is reapplied, and stilts are lost to glaze runs. Budget for them as running cost.
A glaze run onto a shelf is the most expensive small mistake in this hobby, because it takes the shelf as well as the pot. Wash the shelves, keep glaze off the bottom centimetre of every pot, and use stilts only where the glaze is meant to reach the foot.
Cones tell the truth, the controller tells you what it intended
A digital controller reports the temperature at its thermocouple. What matters to the clay is heatwork, the combination of temperature and time, and that is what a pyrometric cone measures by bending. A cone in the chamber beside your work is the cheapest quality control in ceramics.
When a firing comes out wrong and the controller says it did everything right, the cone is usually the thing that explains it: an element ageing, a thermocouple drifting, or a load packed so tightly that one corner never reached temperature.
Common questions
- How much is a pottery kiln?
- Small plug-in kilns cost roughly what a good wheel costs; studio kilns cost several times more, and the electrical installation for the larger ones is an additional cost that no listing includes.
- Can I run a kiln at home?
- Many people do. What it needs is a ventilated space that is not a bedroom, a floor that will take the weight, clearance around the machine, and the right electrical supply. Check your insurance and, if you rent, your tenancy.
- What does a firing cost to run?
- It depends on the kiln's power, the length of the schedule and your electricity tariff, so the honest answer is that you calculate it from the kilowatt rating rather than reading a figure off a page. A full stoneware glaze firing is the expensive one; a bisque is longer and cooler.
- Do I need a kiln to use air dry clay?
- No, and that is the point of air dry clay. It never becomes ceramic, so it also never needs firing.
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The printed price per kilogram of clay, ex VAT in the pottery supplies market was £1.03 in September 2026, across 3 verified supplier product pages recorded in PotterySuppliesHQ Pottery Supplies Price Index.
Cite as: "PotterySuppliesHQ Pottery Supplies Price Index", updated 2026-09-09, https://potterysupplieshq.com/pottery-kiln/.