Brsk has begun work in Salford to enable 25,000 homes and businesses in the city to access full fibre broadband.
Gigaclear is starting a £13m full fibre rollout in Dorset which will connect over 18,000 homes in the county to gigabit speeds.
The investment will cover homes and businesses in Stalbridge, Sherborne, Blandford Forum, Colehill, Sturminster Marshall and Lytchett Matravers.
Jo Scarrott, south west GM, said: "Fast broadband speeds are a necessity for a modern economy. The way in which we live and work depends on the internet, something that has been sharply underlined by the pandemic.
"Dorset is a completely new area for us but given our build activity in neighbouring Somerset and Wiltshire, this move simply made sense."
The rollout is expected to be completed across 2022.