High Country Medical Trust chairman Simon Williamson said Twizel was ''long overdue'' for a new medical centre.
Construction started in January, after 12 months of community fundraising, and was progressing well. Gibbing and cladding were nearing completion.
Mr Williamson said construction was on track to be completed by November and an official opening would probably be held in December.
The Twizel Medical Centre is based in a converted house with two consulting rooms and is not up to the demands of a modern-day medical practice, he said.
The new facility will include seven consulting rooms and triage/minor surgery, X-ray and physiotherapy facilities.
The High Country Medical Trust was in discussions with the South Canterbury District Health Board about services that could be offered from the facility.
It was likely that specialists would be able to travel to Twizel, saving patients travel to Timaru or Christchurch.
''The DHB are talking about moving some of their services so patients don't have to go to Christchurch or Timaru,'' Mr Williamson said.
''That's got to be a huge advantage, especially for the elderly.''
University of Otago medical students would also be able to be posted to the Twizel Medical Centre.
''All sorts of things that we can't do at present,'' he said.
The community had raised close to $1.8million for the new facility.
''The community is really excited. They've really got behind it,'' he said.
The High Country Medical Trust received $150,000 from the latest round of Meridian's Waitaki Community funding, which will put the finishing touches to the new centre, including gardens and an ambulance turnaround that will double as a helipad for emergency services.
''We are very proud to be building such an important facility for the town and delighted that this latest donation from Meridian will allow us to complete all the groundwork and landscaping that will enhance the attractive building,'' High Country Medical Trust board member Joy Paterson said.
She said the community would benefit from the modern facilities that would enable the medical centre to provide more health services than at present.
''The staff are looking forward to being able to do their jobs in up-to-date, spacious and comfortable rooms,'' she said.
Meridian community engagement manager Shelley O'Dwyer said the company recognised the value of the new medical centre and the essential services it will bring to the wider community.
''As a company, health and safety is a priority, so being the biggest employer in the area, the importance of having good quality medical care close by in case of an emergency is not lost on us,'' she said.
