I'm thinking of buying a converted single level barn conversion It doesn't have any gas supply & has electric underfloor heating installed without any other heat sourse Will this be sufficient to heat the building if it's particular cold???

I'm thinking of buying a single-level barn conversion. It doesn't have any gas supply & has electric underfloor heating installed without any other heat source. As far as I'm aware it's installed throughout the building. It was renovated no more than 2 years ago so will be insulated to modern standards.

Will this be sufficient to heat the building if it's particularly cold? I'm in Hertfordshire, England.