How do I choose an oven, and do I need a double oven?

Ovens are sold on a list of programmes, most of which are the same three elements combined differently. The things that actually change your cooking are duller: how much of the stated capacity you can reach, whether the fan has its own element, whether the shelves slide out without tipping, and whether the door holds heat. Get those right and the programme list stops mattering.

What you'll need

• The height, width and depth of the housing unit, measured
• The kitchen circuit rating, if you are replacing a cooker rather than a plug-in appliance
• A tape measure and the door swing checked against the nearest worktop (optional)

Step by step

1. Measure the aperture before you look at a single model.Built-in single ovens are near-universally 595mm wide and 595mm tall, and built-under doubles are around 715 to 720mm tall. The variable that catches people is depth and the electrical connection position at the back — check both against the actual carcass, not the standard.
2. Read capacity as usable litres, not the headline number.The quoted figure is the gross cavity. What matters is whether a large roasting tin fits between the shelf runners, and whether you can get a tray on two shelves at once. Anything under about 65 litres is tight for a whole bird plus trimmings; 70 to 75 litres is the comfortable modern single.
3. Insist on a true fan setting, and learn to spot a fake one.True fan has its own ring element wrapped around the fan at the back, and it heats every shelf equally. Fan assisted uses the top and bottom elements with the fan only stirring the air, which is hotter at the top. If the specification says 'fan assisted' and nothing else, it is the second kind, and multi-shelf baking will disappoint.
4. Check the shelf system with your hands in the shop.Wire runners that let a loaded shelf tip when it is half out are the single most common daily annoyance. Telescopic runners on at least one level are worth real money; flat enamel shelves that slide on rails rather than hooking over lugs are next best.
5. Count the door glass panes and feel the door when it shuts.Three or four panes rather than two means less heat lost through the door, a cooler outer surface with children about, and a cavity that recovers faster after the door is opened. A door that closes with a soft-close damper also stops soufflés and cakes being knocked.
6. Decide the cleaning system deliberately.Three options: plain enamel that you clean yourself, catalytic liners that oxidise splashes above about 200°C, and pyrolytic which burns the cavity out at around 500°C. Pyrolytic is genuinely effective and adds cost, insulation and weight — decide it on how much you hate cleaning an oven, which is a real preference.
7. Now answer the double oven question honestly.A second cavity earns its place if you routinely need two temperatures at once, cook for six or more, or want a small cavity for weekday use so you are not heating a large one. If your honest answer is 'twice a year', a single oven plus an air fryer or a combination microwave does the same job for less money and leaves you a cupboard.
8. Check what the appliance needs electrically before you buy.A single built-in oven is often under 3kW and may plug into a switched fused connection unit, but many ovens and nearly all cookers need a dedicated cooker circuit. Confirm the rating on the model and what your kitchen already has, because the wiring is a separate job with its own cost.
9. Compare the energy label as a running-cost figure, not a letter.The label gives kWh per cycle. Multiply that by your own unit rate from your bill and by how many times a week you use it, and the difference between two ovens becomes a number of pounds a year rather than a letter grade.

Tips

• A single oven with a separate grill in the same cavity means you cannot grill and roast at once. If that matters to you, it is an argument for a double before any other feature is.
• Meat probes, steam assist and thirty programmes are pleasant. A door that holds heat and shelves that do not tip are the things you notice every single week.
• If the oven is going under a worktop rather than at eye level, check the door does not foul a dishwasher or drawer front when both are open.
• Ovens are one of the few appliances where display models are worth visiting: open the door, pull the shelves out loaded with your hand, and see how the controls feel.

Common mistakes

• Buying on the number of functions — Almost every oven has the same three or four heat sources. The programme list is those sources combined and named; it tells you nothing about how evenly the oven cooks or how much of it you can use.
• Assuming a double oven is two full ovens — On a built-under double the top cavity is usually small and doubles as the grill. You get flexibility, not twice the capacity, and the main cavity is often smaller than a good single oven's.
• Not checking the electrical supply until delivery day — An oven that needs a cooker circuit where there is only a socket means an electrician, a new circuit and a delay — and it is notifiable work, so it is not something to improvise on the day.

Alternatives

• Single built-in oven, 70 to 75 litres: The default for most households. Enough capacity for a full roast, one cavity to heat, and the money saved over a double buys a better specification of everything else.
• Built-under or built-in double oven: A main cavity plus a smaller top cavity that usually contains the grill. Worth it for frequent two-temperature cooking or larger households; less capacity per pound than a single.
• Single oven plus a combination microwave: The flexible compromise. The combination unit covers reheating, small bakes and grilling, and takes the load off the main oven midweek without a second full cavity.
• Range cooker: Two or three cavities plus the hob in one freestanding unit. Buys capacity and looks; costs floor width, and ties the hob and oven replacement together.

Questions people ask