The firm, which employs around 35 staff and turns over £9m, has been bought by Skelmersdale-based Sustainable Building Solutions, owned by Derek Horrocks who also runs St Annes Contractors, which specialised working with PermaRock products.
Carillion acquired the wall panel insulation business when it took over Eaga in April last year.
PermaRock is one of the country’s leading external wall insulation suppliers and expects to see sales surge as the Government’s Green Deal takes off.