If you have mains gas then why do something else for heating stick a conventional boiler in with a hot water cylinder, oil costs a bit more install and to run, heatpumps much more to install and whilst you might get cheaper running costs (with solar and battery storage) you have to pay for all that extra gear and it doesn't change the fact when you want the most heat output you have the least light on the panels and the lowest efficiency from the heat pumps.
Our heat pump installer (we do a lot of commercial work which use a ton of combined heating/ air-conditioning units) has just removed the system he installed in his own house and put an oil boiler back in, got tired of his wife moaning it wasn't warm enough whilst it was using a fortune in electricity.
Plus to not be disappointed with heat pump heating you need to be very well insulated and draft free, plus make all your radiators larger.
I really would get a diesel generator for 3 phase if the utility wants silly money for a connection, because you can run off it when there's a power cut, which is going to be much more common in the future.
WRT building control, haven't used the council ones in years, went with a private provider about as soon as they started (an ex council guy) much more helpful, wants to help find solutions to problems.
Since October 2023, building control cannot be and mustnt be helpful. If they are, they run the risk of being struck off. After October 23, many private building control companies have ceased trading. You may find things are rather different future.
I dont, and i suspect the OP does not have access to mains gas. So oil or heatpumps are the only viable options.
Im well aware of heat pump shortcomings, or rather the shortcoming of the skills base to install in the uk. The product itself is fine. Though still pricey to run compared with oil.
Anyway, im hijacking the thread!






























































