Openreach says more than 2,100 homes and businesses in the town are eligible to upgrade to full fibre, but less than half have made the switch.
The company has invested £630,000 in a new full fibre network covering about 80 per cent of properties.
Martin Williams, Openreach partnership director for Wales, said: “Fast and reliable full fibre broadband gives households and businesses a significant boost.
“As the UK’s leading provider of fibre infrastructure, Openreach is at the forefront of the digital transformation, connecting communities all over the UK and future-proofing the network for decades to come.
“Our extensive network – the largest in the UK – means residents can shop around and find the best deals that suit their needs.
“But it’s important to remember that upgrades don’t happen automatically.
“People need to order it to take advantage of the technology.”
Full fibre broadband offers faster, more reliable internet that can support multiple devices at gigabit speeds.
People in Builth Wells can check their upgrade options using Openreach’s full fibre checker online.
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Mr Williams said: “Openreach is committed to building the best full fibre network, and doing it sustainably is crucial for our business, the communities we serve, and the environment we all share.
“As part of our ‘Let’s Reach Zero’ strategy, we aim to lower our carbon emissions, use less and waste less material, and protect nature wherever we operate.”
The technology supports streaming, gaming, video calls, online banking, and running a business, offering a smoother digital experience.
Openreach’s full fibre network now covers more than 19 million properties.