It depends.
"Normal" electric heating is about 4x more expensive than gas/heat pump. BUT ... it is less likely to go wrong, there is no annual service required and no qas standing charge. It is easy to turn on and off radiators in individual rooms to reduce the power consumption.
if you are in a small terraced house then you will only have two outer walls. If it is a new build (you say "new" but not clear whether that means new to you, or new build) then it will probably be well insulated. 4 heaters is not a lot.
Maybe check out the EPC on the government site to see what the annual estimated consumption is. If it is highly rated, C or above it probably doesn't cost that much to heat it, but it will guesstimate on the EPC. If it is low rating then I would think twice.
There are also other tricks you can use, like use E7 to reduce the bill, it really depends on how flexible you can be with the heat.
Maybe ask the previous homeowner or ndn what the bill is like.
I wouldn't write it off, but I would want to investigate. Electric heating can be v expensive but under the right conditions it is not the evil many people make it out to be.