Work to fill chalk mines in Hemel Hempstead with foam concrete was completed just days before the sinkhole in Adeyfield appeared.
Now Dacorum Borough Council is waiting for a final report to sign off the Nash Mills works, which will take around three months.
Where needed roads, pavements and grassed areas will be reinstated around the Highbarns area and verge hardening will be introduced in Chambersbury Road to ease parking pressures.
The chalk mines - believed to have been dug as part of Hemel Hempstead’s famous paper making heritage - were discovered when a patio collapsed back in 2007.
However, as the long-running project comes to an end there is still work to be done on a further collapse that happened outside of the original works area in October last year.
The collapse - in Meadow Road - has been investigated and proposals drafted for treatment to make it safe.
Assistant director of performance and projects Shane Flynn said: “The good news is that the probing indicated that the mine does not extend under the houses but is confined to the Highbarns/Meadow Road junction and highways.
“It has to be stressed that this does not mean that there is no unstable ground under those properties as this has not been tested, only that the mine that we have been treating does not appear to extend in that direction as far as we have been able to determine from dynamic probing.”