Work has started to fill Hemel Hempstead’s sinkhole with concrete this morning.
On the advice of leading sinkhole expert Dr Clive Edmonds, the 20ft deep crater is being plugged with foam concrete today.
Over the weekend geo-technical probing will begin on the Oatridge Gardens estate and it is expected to take up to a week.
Once the area has been probed, the results will be analysed to identify any further work that may be required to make the site safe.
The 48 homes in Oatridge Gardens were built for Hightown Praetorian and Churches Housing Association in 2008 by the Jarvis Group.
Hightown says the site was thoroughly investigated prior to designing the development and the piled foundations were designed by a structural engineer taking into account geo-technical reports.
Householders, who have been forced to evacuate their homes, have been put up in hotels if they were unable to stay with family or friends.
The area remains cordoned off and people are being urged not to visit the site while the works are in progress.
>Picture by Stuart Marsh SKM Studio - Airscape Photography.