The 33ft (10m) deep hole appeared in Fontmell Close, St Albans, a former clay pit site, on 1 October last year.
Investigations into the cause mean utilities to some homes have not yet been restored and the road has not reopened.
Hertfordshire County Council hopes the work will be completed by Christmas.
More on this story and others from Hertfordshire
Following the collapse in the early hours, families in more than 50 homes were left without power, water or sanitation before temporary solutions were provided for the majority.
Residents still have to use a temporary road built across a nearby heath.
A full microgravity survey and exploratory drilling established the hole was caused by old mine workings and a ground subsidence investigation report found that no evidence "indicated further significant mined voids".
Councillor Terry Douris said: "It was essential that we established the cause of the collapse before we started repairs.
"This has been an extremely stressful time for the residents and it would be wonderful if they can be safely back in their homes for Christmas."
Ben Bagshawe was evacuated on the night along with his heavily pregnant wife, and their baby boy was born a week later.
They have been renting a flat for the past year with the cost covered by his insurance.
"It's been frustrating but not the end of the world," he said.
Rosemary and Derek Broom, the residents closest to the hole who have been able to remain in their house, said they feel the road is now "the safest place to live in the country".
"The roads, the fields, the children's play area, everything has been so well surveyed we don't feel at all worried," Mrs Broom said.

Police said the victim was set upon by up to eight men in the Heights area at about 02:00 BST on Sunday.
A 30-year-old man was arrested but has since been released on police bail pending further enquiries.
Police have appealed for information about the attack.

The jazz film is the follow up to director Damien Chazelle's Academy Award-winning film Whiplash.
The People's Choice, voted for by the audience, has proved to be a decent predictor for Oscars success in recent years.
Previous winners include 12 Years a Slave and The King's Speech.
La La Land, set for release in December, stars Stone as an aspiring actress in Los Angeles who meets a jazz pianist (Gosling) who is trying to stay true to the music he has devoted himself to.
The film also stars singer John Legend and JK Simmons, who won an Oscar for best supporting actor for his performance in Whiplash.
La La Land has enjoyed rave reviews since premiering at the Venice Film Festival in August.
Chazelle wrote the script six years ago but was not able to persuade anyone to make it until he broke through with Whiplash in 2014.
Stone, who won the best actress prize at Venice for her La La Land role, previously starred with Gosling in Crazy, Stupid, Love.
Toronto's Platform prize for international directors was won by Pablo Larrain for Jackie, the Jacqueline Kennedy biopic starring Natalie Portman.
Raoul Peck won the People's Choice documentary award for I Am Not Your Negro, which follows the lives and assassinations of Martin Luther King Jr, Malcolm X and Medgar Evers.
The film is based on James Baldwin's unfinished book, Remember This House.
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Four families who had to move out of their homes when a huge sinkhole opened up in their road are still waiting to return after a year.
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A 28-year-old man has been beaten by a gang armed with metal bars and bats in Coleraine, County Londonderry.
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Musical movie La La Land has picked up the prestigious People's Choice award at the Toronto International Film Festival (TIFF).