Is it more expensive to put in a new electric built in oven or just replace with a gas built in oven.

The rating in Kilowatts of the new oven, will dictate if it needs a separate new electrical circuit or if it can bew spurred off a socket. A lot of the cheaper electric single ovens are rated at around 3kw so could be wired in to an existing socket quite safely. As highlighted in the other reply, any electrical work in the kitchen is subject to notification to the local authority under part P of the building regulations. so you need to get a registered electrician to do the work and ensure you get the certificate. Otherwise you can face proescution and be fined up to £5000 for breaking building regulations!

It depends on the new ovens power rating .some come with a 13amp plug fitted others need to be hard wired and you might need to upgrade your db.as said your going to need the advise of a sparky and if you go with the electric option your going to have to cap the gas supply so more expense for a gas plumber.so you'll end up spending more.

You will need to get a sparky in, the new electric cooker will be hard wired straight into back of cooker. they will have to be a registered electrician for insurance purposes. Regards Paul

It's better to have a modern fan assisted oven as there is more heat but you will need an electrical circuit fitted to take the extra demand on the circuit loaded. Although cheaper if there is gas already fitted of course if you are going for a gas oven.