Pendle has been named the least energy-efficient area in Lancashire.
Just 33.82 per cent of homes in the borough achieve an energy performance certificate (EPC) rating of Band C or above, according to analysis by Brick Wholesale using data from the Office for National Statistics.
This means that 66.18 per cent of homes in Pendle fall below Band C, with properties rated between Bands D and G.
Hyndburn follows closely behind with 34.49 per cent of homes meeting Band C or above, while Blackpool ranks third-lowest at 36.24 per cent.
At the other end of the scale, Preston leads the county, with 57.68 per cent of homes reaching Band C or better.
Max Fetisov, head of marketing and e-commerce at Brick Wholesale, said: "The Lancashire figures show a really significant difference between neighbouring areas.
"In Pendle and Hyndburn, only around a third of EPC-rated homes achieve Band C or above, while in Preston the figure is approaching six in ten.
"Perhaps even more striking is that 11 of Lancashire’s 14 local authorities sit below the England local-authority average.
"That suggests the issue isn't confined to one isolated part of the county."
EPC ratings range from A, the most efficient, to G, the least.
A score of 69 or higher qualifies as Band C.
The median EPC score in England is 69, meaning the average English home just meets the Band C threshold.
The figures come as households brace for higher energy bills.
Ofgem recently confirmed a four per cent increase in the energy price cap from October 1 to December 31.
This will raise the typical annual bill for direct debit customers from £1,663 to £1,723.
Mr Fetisov said: "Lancashire has a substantial stock of older brick housing, including traditional terraces and solid-wall properties, alongside much newer homes built using insulated cavity-wall construction.
"These can behave very differently when it comes to keeping heat inside."
Mr Fetisov said: "The first step towards improving energy efficiency is therefore understanding how that particular building was actually constructed."
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Across Lancashire’s 14 local authorities, an average of 45.75 per cent of homes meet Band C or above, compared to the national average of 52.69 per cent.
Only Preston, West Lancashire (55.75 per cent), and Chorley (54.54 per cent) exceed the England average.
South Ribble follows with 52.32 per cent, while other areas fall below 51 per cent.
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